Study on the AFM Force Curve Common Errors and Their Effects on the Calculated Nanomechanical Properties of Materials

Table 2

Summary of the calculated elastic modulus and the disadvantages of each type of equipment and numerical model used in this study.

Materials	Equipment	Numerical model	Assumptions	Disadvantages	Calculated (MPa)
PEEK	AFM	Oliver-Pharr	—	The indentation depth could not be extracted from the force-piezo displacement	—
		Hertz			—
	Nanomechanical test system	Oliver-Pharr	—	—	3937 ± 149
		Hertz		The indentation depth has too much error [38]	1600 ± 40
SPEEK	AFM	Oliver-Pharr		The contact indentation depth cannot be extracted	—
		Hertz		The indentation depth can only be extracted for the first few nanometers	5.6 ± 1.1
	Nanomechanical test system	Oliver-Pharr	—	—	411 ± 16
		Hertz		—	510 ± 250