Advances in Materials Science and Engineering / 2015 / Article / Tab 1

Research Article

Characteristic Evaluation on Bolt Stress by Ultrasonic Nondestructive Methods

Table 1

Austenitic stainless steel bolt (A2-70) axial tensile stress measurement results.

Stress (μs) (μs)

042.83176.173.145160
2042.841576.2043.146601−2.53 × 1014
4042.860576.22653.145552−1.27 × 1014
6042.8876.2473.14423−8.57 × 1013
8042.89776.2663.143192−6.47 × 1013
10042.915576.28353.14176−5.22 × 1013
12042.932576.30253.140722−4.38 × 1013
14042.951576.3183.13902−3.80 × 1013
16042.968576.3383.13808−3.34 × 1013
18042.98876.3573.13663−3.00 × 1013
20043.004476.37753.13583−2.71 × 1013
22043.024576.39653.13429−2.49 × 1013
24043.04276.41753.13336−2.30 × 1013
26043.06276.4393.13207−2.14 × 1013
28043.08176.4623.131084202
30043.102576.4863.129780475
32043.12476.5123.128663993
34043.14876.53553.127547129
36043.175576.55653.12635963

= 5638.499 m s−1.
= 3105.499 m s−1.
λ = 9.8160 × 1010.
μ = 7.5710 × 1010.
ρ = 7850 kg m−3.
Explanation:
Stress [MPa] bolt axial stress.
[s] time of propagation of longitudinal wave.
[s] time of propagation of shear wave.
  μ the second-order elastic constants of the material.