Experiment Investigation on Fretting Wear and Wear Debris Performance for the Stem-Cement Interface

Zhang, Lanfeng; Ge, Shirong; Liu, Hongtao

doi:https://doi.org/10.1155/2015/945259

Journal of Nanomaterials

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Abstract Introduction Materials and Methods Results Conclusions Acknowledgments References Copyright Related Articles

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Chemical Functionalization, Self-Assembly, and Applications of Nanomaterials and Nanocomposites 2014

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Research Article | Open Access

Volume 2015 | Article ID 945259 | https://doi.org/10.1155/2015/945259

Experiment Investigation on Fretting Wear and Wear Debris Performance for the Stem-Cement Interface

Lanfeng Zhang,¹Shirong Ge,¹and Hongtao Liu²

Academic Editor: Tifeng Jiao

Received07 Aug 2014

Accepted27 Aug 2014

Published13 Aug 2015

Abstract

After the interface debonding, the body protein fluid is subsequently pumped into stem-cement fretting wear interface, serving as the lubricant. On the stem surface, whether there is the influence of protein absorption on fretting wear or not is considered in this study. The biotribological properties at the stem-cement interface were investigated by SEM. The result of hysteresis loops shows that elasticity and plasticity performance of the frictional interface materials can be damaged by fretting fatigue and material energy dissipation will increase periodically. The wear quantity of cement is mainly influenced by load and displacement. The maximum wear loss of bone cement could reach 1.997 mg. Bone cement and titanium alloy wear debris, whose size distributions are widely spread from 1 to 110 μm and 5 to 150 μm, respectively, are shaped like tuber, tear, sheet, strip, and sphere, which will induce the osteocyte damage.

1. Introduction

The failure of cement type total hip replacement (THR) is mainly due to loose interface caused by different modulus of elasticity of contact materials and the patients’ debris disease caused by the continuous friction and wear between components’ interfaces [1–3]. Though scholars differ greatly in the complicated causes for the loosening and wear after THR, they have widely accepted the continuous fretting wear at the bone cement-stem interface [4]. The results of Jasty and Zhang showed that the stem-bone cement interface has been cited as a weak link, and it has been indicated from clinical and experimental studies that debonding of this interface may be inevitable [5, 6]. Lennon and Prendergast and Goodman demonstrated that the bone cement solidifying technology, human body environment, and the mechanical fretting of bone cement-stem interface work together, which make the influence process of interfacing wears more complicated [7, 8]. In addition, impacted by the tiny interface and metal shadow, it is hard to inspect whether there are fretting wears on interface through X-ray and CT scanning which has been verified by Ryd et al., whereas the stem’s sinking distance, interface’s normal load, and microdislocation can damage the elastic-plastic characteristics of replacement components on one hand [9–11] and induce the growth of fibrous tissue and the appearance of wear debris on interface, which initiate aseptic inflammation finally [12, 13]. Therefore, it is urgent to make analysis on fretting wear characteristics of bone cement-stem interface.

Earlier researchers mainly conducted with mechanical fixation and the implantation of prosthesis [14–16], which will induce fretting fatigue and then fretting wear. Later on, researchers discovered that fretting wear is related not only to fatigue but also to environment [15–19], let alone studying the fatigue damage process of implant material through the hysteresis loops, which was complemented by this paper. Accordingly, numerous researches of Geringer et al. focused on the effects of serum on fretting wear interface and found that without albumin the interface wear quantity of concave and convex points increase as the chloride converges, whereas protein not only can protect the interface from being worn but prevent erosion [20–24]. Being influenced by the electrochemistry of the body, Kim et al. find that chloride can increase the quantity of concave and convex points in wear region and then generate wear debris, among which 80% are less than 100 nm. These debris are the key ones that induce the growth of fibrous tissue [25–28].

Though clinical reports and instigations revealed the bioreaction, which means reconstruction of femur, of the destruction of human bone caused by wear debris, few researches interpreted the wear mechanism over the course of micromotion and studied the morphology and size of wear debris. This study, which aims to act as a supplement, provides further investigation of bioreaction of wear debris with proof.

2. Materials and Methods

2.1. Experiment Equipment and Materials

The experiment will be made on UMT-III microfriction and wear tester (as illustrated in Figure 1(a), UMT-III, Centre for Tribology Inc., Campbell, CA, USA) produced by USA Center Company. Medical titanium alloy Ti6Al4V pins are adopted with a diameter of 4 mm and a height of 10 mm, which were manufactured to simulate the femoral stem; the average roughness arranges from 0.03~0.06 μm [17]. Bone cement is made into rectangle blocks of 12 mm long, 8 mm wide, and 4 mm high in model making process (as illustrated in Figure 1(b), Synthetic Material Research Institute, Tianjin, China), and the surface roughness is 0.3 μm. Mechanical property and compositions of the tested materials are as follows in Tables 1, 2, and 3 [29, 30].

(a)

(b)

2.2. Tribological Experiment

Orthogonal fretting wear test of twenty-four samples on titanium alloy and bone cement interface is conducted under different loads and amplitudes. Flat-flat contact model wear test is made in the following conditions (as illustrated in Figure 2), 25°C indoor temperature, 55%~60% humidity, dry friction, and 25% calf serum lubricants (Sijiqing Biological Engineering Materials Co. Ltd., Hangzhou, China) in nylon mould: (displacement) = ±30, ±40 and ±50 μm; (contact normal loads) = 20 N, 40 N, 60 N, and 80 N; the corresponding pressure is 2.75 MPa, 3.89 MPa, 4.72 MPa, and 5.45 MPa [16, 17, 19], respectively. According to the ISO5833 standard, Zhang and Ge found the maximum compression strength of bone cement researched 96.26 MPa [31]. Compared with the maximum contact pressure 64.9 MPa in the study conducted by Zhang et al., this contact pressure could be accepted for the fretting wear test [17]. This was calculated on the basis of the following equations for the contact pressure of cylindrical pads on a plane specimen configuration, according to the Hertz theory [14]. The contact pressure was comparable to the normal contact stress at the stem-bone cement interface, which would be dominant following debonding of the femoral stem from the cement mantle [6, 19]:

In order to accelerate the test of the gait cycle frequency of 1 Hz, fretting frequency Hz and the cycle period of times were selected. This frequency was chosen to accelerate the wear simulation but not to affect the results much [23].

A total of forty-eight samples were divided into two groups to conduct two tests, and each one contains 24 orthogonal tests. Before each test, the specimens including the metallic pin and the bone cement disk were cleaned in an ultrasonic bath using acetone and deionized water for 15 min each followed by drying with an N₂ gas jet. After each test, the metallic pin and the bone cement disk were removed from the testing apparatus, dried with the N₂ gas jet [17].

2.3. Evaluation of the Experiment

Draw fretting movement figure (--) on the basis of experiment data ( stands for Friction stress and stands for cycles), analyze the movement characteristics of fretting wear region on friction interface, make statistics on bone cement matrix’s wear extent, and draw wear microgram further. Quanta 200 ESEM FEG scanning electron microscope (SEM, FEI, Eindhoven, Netherlands) is applied separately in collecting wear scar feature on the stem-bone cement interface, and analysis is made on the debris shape and its generating mechanism.

Titanium alloy and bone cement interface fretting is a reciprocating process (Figure 3(a)). Take 30 μm starting fretting amplitude for instance, move 30 μm aside and the friction force occurs, the rear end of Ti6Al4V metal material wears with bone cement, which makes an edge wear of 30 μm approximately and the wear scrap accumulation (Figure 3(b)). Shift back 60 μm in unloading; the titanium alloy has tip shift back and wear at ±30 μm place and makes 30 μm wear (Figure 3(c)). Shift the detector aside 30 μm to its original place, and forms a wear cycle motion (Figure 3(d)).

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(b)

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3. Results

3.1. Mechanism of Fretting Operation

In purpose of analyzing the process of fretting movement, -- curves are being analyzed when N and μm and N and μm, respectively. Figure 4 shows the fretting operation of titanium alloy surface and bone cement matrix under the circumstances of dry friction and calf serum lubricants. In dry friction, when N and μm, - curve is in shape of parallelogram at early stage, while with the increase of fretting cycle, when , - curve transforms into straight line gradually (Figure 4). When N and μm (in Figure 4(b)), the distance between loading upper curve and unloading lower curve increases, which illustrates the energy consumption at early stage is slightly higher; meanwhile, when , - curve transforms into ellipse. When , the distance between loading upper curve and unloading lower curve decreases, which illustrates the energy consumption drop, whereas in calf serum lubricants, when N and μm, the - curve transforms from parallelogram into ellipse , and when , the curve transforms into flat ellipse (Figure 4(d)).

(a) N & μm (dry friction)

(b) N & μm (dry friction)

(c) N & μm (in calf serum medium)

(d) N & μm (in calf serum medium)

The - curve transforming into parallelogram at early stage indicates that the contact area is completely in slippage and wear region, and because elasticity and plasticity transformations of different materials occur in contacting and cooperating process, three-matrix abrasion has not formed in friction surface; therefore, the energy consumption of microamplitude is slightly higher. When the load and cycle increase to a certain extent, the - curve turns into ellipse gradually, which indicates that the tangential fretting operates in mixed region (the medium transition phase between the overall slippage and partial slippage of the interface). With the cycle increase, - curve will close and transforms into flat ellipse, which indicates that the interface is in balance between elasticity and plasticity transformation and contact stiffness, partial slippage region, and adhesion region come into being on wear interface.

The size of fretting contact area, stress distribution, wear depth, and wear quantity are all determined by loads; - curve in the same cycle changes with the increase of contact loads. As illustrated in Figure 5, when (1 cycle), - curve (±30 μm) is basically parallelogram at the early stage, except that under 80 N load is ellipse at the early stage. There is no change when cycle period reaches (Figure 5) and under 20 N load, which indicates that the surface is still in the elastic area, whereas, when under the loads of 40 N and 60 N, the - curve transforms from parallelogram into ellipse gradually; for it is just the early stage of wear period, there is no obvious change in fretting diagram. When the load reaches 80 N, obvious elasticity and plasticity transformations occur on the bone cement surface; yet - curve remains unchanged. When the cycle period reaches (Figure 5), - curves under different loads change gradually. When under 20 N load, the - curve seems like parallelogram, while under 40 N and 60 N loads, the curves will change alternately between parallelogram and ellipse, which indicates that the wear interface begins to transit from slippage to partial slippage. Analyzing from Figure 4, we can find out from the fretting figure in hysteresis loops of and under 20 N load that the original ellipse turns into lines gradually with the influence of cycles, which illustrates that the straight line slopes in the loading and unloading process are the same and the wear quantity remains stable. When under 40 N, 60 N, and 80 N, the - curve has transformed into stable ellipse. When the cycle period reaches 5,000 cycles, - curve remains stable; the fretting diagram under 20 N loads is linear while that under 40 N, 60 N, and 80 N turns into stable ellipse.

3.2. Fretting Wear Quantity Analysis of Bone Cement Matrix

As illustrated in Figure 6, the wear quantity of bone cement sample increases with adding contact loads in different wear conditions, amplitudes, and loads. Some researches demonstrated that the proteins in fretting tribological behavior play a passive role in protecting the wear region [20–28]. Under the same contact load, the wear quantity of bone cement in the calf serum is greater than that in the air.

3.3. Morphology Study on Wear Debris

3.3.1. Morphology Study on Bone Cement Wear Debris

After transplanting the artificial stem into human’s body, for the extremely rigid biological friction and wear environment on titanium alloy and bone cement interface, friction interrelated biomechanical changes are unpredictable and the wear period is relatively long; therefore wear types can be found out through the study on the interrelated wear debris appearance produced in friction. As shown in Figure 7, the bone cement wear debris are in various shapes, including the wear debris in strip, block, sheet, and ball shape and the different particle sizes. Some basic rules can be found out that the larger the size of the wear debris is, the more complicated the surface becomes, and the appearance of wear debris with smaller particle size transforms gradually into spherality or near spherality. After studying and observing the wear debris for several times, we find that it is a common and universal rule. The matrix of wear debris in SEM picture is titanium alloy, because the wear debris are so small that they could not be deprived from the friction contact surface.

(I) Spheral Wear Debris. The maximum and minimum debris sizes of spheral wear debris are basically 10 μm and 1 μm approximately, which distributes widely and is one kind of wear debris that exist in greatest amount. It can be found in Figure 8 that the surface texture of the spheral wear debris is quite smooth. It is inspected that wear debris with large particle sizes usually exist in shapes of block, sheet, or strip, whereas those with small particle sizes tend to be in spheral or near spheral shapes, which results from the cooperation of repeated rubbing in the reciprocating fretting wear and the debris wear, which is formed in the late period of wear debris abrasion. When the wear debris accumulate to a certain degree, they will be attached to bone bed and induce osteoclast activating factor to make broken bone physiological response under the joint capsule press and they are the main wear debris that induce hip aseptic joint replacement loosening.

(a)

(b)

(II) Tuberous Wear Debris. The length and width ratio of tuberous wear debris (Figure 9) is nearly 2 μm with the spindle-shaped or flat tuberous appearance, and obvious lines rise and fall on its surface. Water prop shaped wear debris is mainly formed by adhesion wear and is always ripped or torn in the process, and its particle size is about 5 μm, while flat wear debris originate from the crack nuclear on friction surface caused by fatigue stress on the friction interrelated surface, which rips off at the weak bonding point of bone cement matrix under the friction interrelated adhesion, and its particle size is about 2~20 μm. The debris are formed at the interface debonding period, attached to the titanium alloy surface, and are the early product of fretting wear.

(a)

(b)

(III) Ellipse Wear Debris. The width and length ratio of ellipse wear debris is from 2 to 5 and the appearance takes the shape of ellipse (Figure 10). Obvious lines rise and fall on wear debris surface, which is mainly produced and developed from bone cement tuberous wear debris. Tuberous debris are polished into ellipsoid gradually under the reciprocating wear model and long term three-matrix abrasion, and the ellipsoid wear debris are the early forms of spheral wear debris with the particle size of 2 to 15 μm approximately. This type of wear debris is formed under the repeated roller compacted damage of large bone cement tuberous wear debris ripped off.

(a)

(b)

(c)

(IV) Lacerated Wear Debris. Lacerated wear debris originates from the dropping of asperity slippage wear which makes cracks on matrix surfaces, for wear debris produces in the same direction with that of crack extension, the existing parts peel off from matrix under cutting and furrowing, together with fatigue wear, lacerated wear debris come into being. This type of debris has irregular and coarse edge line and the particle size is 5~35 μm (Figure 11), which is formed at the fatigue wear stage.

(V) Sheet Wear Debris. Sheet wear debris has relatively large area and small thickness and takes the shape of irregular polygon (Figure 12). It is mainly because the tiny materials peel off between surface and subsurface under fatigue effect and then, attached to material surface, sheet wear debris is formed after reciprocating press, and its particle size is 20 to 50 μm. This kind of wear debris is formed at the fatigue wear stage.

(a)

(b)

(VI) Strip Wear Debris. Pole-shaped wear debris has a diversified structure in appearance. There are mainly three formation reasons for strip wear debris; firstly, the matrix is ripped off the matrix in scraping action; secondly, wear debris are formed in the friction process; thirdly, sheet wear debris are rubbed into rope shaped wear debris in friction interrelated motion, which reflects the motion state of reciprocating fretting wear, and the length of wear debris is 15 to 110 μm (Figure 13). It is the derived product of ellipsoid wear debris and it is formed at the middle and late stages.

(a)

(b)

(c)

(VII) Pole-Shaped Wear Debris. Pole-shaped wear debris has a diversified structure in appearance, curvy edge line, and stable surface lines, and its size is 5 to 30 μm. There are two main reasons for the formation of pole-shaped wear debris; firstly, debris are produced in thermoplastic transformation and microcutting. Pole-shaped wear debris are usually produced in breaking in period with the size of 10~50 μm. Secondly, it is formed because of the falling furrow edge drop in surface cutting, and its size is 10 to 80 μm (Figure 14). Pole-shaped wear debris are generated at the same stage with strip wear debris and then suffer from abrasive wear.

3.3.2. Morphology Study on Titanium Alloy Wear Debris

It can be found in Figure 15 that titanium alloy wear debris are small in size and most of which take the irregular shapes. Though its modulus of elasticity is higher than that of the bone cement, the inserted metals exist in long-term complicated fatigue damage conditions, which will accelerate the crack extension on wear surface and lead to the formation of wear debris at last and the generation of osteoclast factors. Therefore, study on titanium alloy wear debris’ forms is quite significant.

(I) Strip Wear Debris. Strip wear debris is commonly seen in titanium alloy wear debris group with the size of 10 to 50 μm. It has rather smooth surfaces and there are various reasons for its formation. First of all, the previously ripped small titanium alloy wear debris transform gradually into abrasive wear form in fatigue wear process. On the other hand, the large sheet wear debris’ edges are hardened and become thin and sharp which scrapes titanium alloy matrix in friction process. Such kind of wear debris has rather sharp wings; the existing wear debris on friction surface generated in fretting wear process come into being (Figure 16) at the late stage.

(a)

(b)

(II) Spheral Wear Debris. Spheral wear debris of titanium alloy in spheral shape are shown in Figure 17(a) which are small in size and whose distribution scopes are usually smaller than 15 μm. There are uneven lines on the surface and many debris gather around. (Figure 17(b)). They are mainly the products of fatigue wear and adhesion wear caused by the broken large wear debris which come into being in titanium alloy fretting wear. In addition, the falling debris cannot escape from wear region easily and finally the spheral wear debris comes into being with the size of 1 to 30 μm approximately. This type of wear debris is formed in the late period of fatigue wear.

(a)

(b)

(III) Tuberous Wear Debris. Wear debris of this type are spindle-shaped (Figures 18(a) and 18(b)) or in flat shape (Figures 18(c) and 18(d)) with a small width and length ratio and complicated edge outlines, and there are uneven lines even obvious scars. Spindle-shaped wear debris come mainly from adhesion wear with a size of 5 to 100 μm, while the flat wear debris are formed because the crack nuclei formed on friction surface under the fatigue stress on the friction interrelated surface peel off and tear away from matrix at the weak bonding point of matrix materials under the effect of interface adhesion, and their distribution scopes are 5 to 50 μm. They originate from lacerated wear formation and come into being at the mid-term stage of fatigue wear.

(a)

(b)

(c)

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(IV) Lacerated Wear Debris. Lacerated wear debris are the products of friction interrelated reciprocating motion with irregular and coarse surface and uneven lines on the surface which give people the sense of hierarchy and mainly from the falling debris from titanium alloy matrix under the fretting fatigue effect (Figures 19(a) and 19(b)). With the cycle load, cracks on fatigue wear edges extend in vertical direction with wear direction (Figures 19(c) and 19(d)). The successive wear accelerates the ripping of titanium alloy surface and then the wear debris come into being. The common size distribution scope is 5 to 50 μm and titanium alloy extends in different sizes from partial peeling to complete peeling which makes the wide distribution of wear particle size (Figures 19(e) and 19(f)). This kind of wear debris is formed at the early stage of fatigue wear.

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(V) Sheet Wear Debris. The titanium alloy sheet wear debris have relatively wide size distribution ranging within the scope between 5 and 60 μm and smooth surface. There are two reasons for the formation. On the one hand, the early stripping tuberous debris of titanium alloy transform and harden in fretting wear process, and for the hardness and tension are higher than those of the matrix, therefore this type of wear debris comes into being. On the other hand, the fatigue peeling occurs on the wear surface of large titanium alloy under the effect of fretting wear which is broken into wear debris in smaller sizes in the reciprocating wear motion (Figure 20). This type of wear debris originates from tuberous wear debris and forms at the late stage of fatigue wear.

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(b)

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These results, which were consistent with other clinical results in other literature, proved that the particles shaped like spherical, sheet, and so forth were the main reason why a series of bioresponses like the increase of osteoclast were induced [32, 33]. Also, through the analysis of the morphology of wear debris, not only did this paper refine the research used to be analyzed just from the aspect of size in clinic but also it provided further analysis of the bioresponses induced by different morphology and size of the wear debris with evidence.

4. Conclusions

In this study, the fretting wear mechanism and debris analysis at the stem-bone cement interface under fretting wear were investigated through a series of frictional tests. The following conclusions can be drawn from this work.(1)Compared with hysteresis loops under different loads and displacements, the result shows that elasticity and plasticity performance of the frictional interface materials can be damaged by fretting fatigue. In addition, material energy dissipation will increase periodically.(2)The wear quantity of the bone cement is mainly influenced by load and displacement. As load increases, the albumin passive film gradually fails to protect the wear interface. The maximum of the wear loss between stem and bone cement for displacement 100 μm and load 80 N could reach 1.997 mg.(3)Bone cement wear debris’ size distribution is relatively widely spread from 1 to 110 μm. The bone cement wear debris in tuberous, tear, and sheet shapes are formed at the early interface ripping stage, while sheet and strip wear debris will be affected by fatigue wear and reciprocating acts, respectively. The spheral wear debris is the main wear debris. Titanium alloy wear debris’s size ranges from 5 to 150 μm, and tuberous and sheet wear debris are formed at the early and middle stage. Tear-shaped wear debris are affected by fatigue wear while sphere and trip wear debris are formed at the late stage under the influence of wear acts. In this paper, fretting wear properties and morphology and the size distribution of the wear debris were detected in fretting wear test [32–39], which was consistent with the results of the size of wear debris in other literature. Moreover, different morphology of titanium alloy and bone cement debris was listed in this paper according to the classification of morphology, which served as a complement in this research.

Conflict of Interests

The authors declared that they have no conflict of interests regarding the publication of this work.

Acknowledgments

This work is supported and sponsored by Qing Lan Project and the Scientific Innovation Research of College Graduate in Jiangsu Province (no. KYLX_1376).

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Copyright © 2015 Lanfeng Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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