Comparison of mechanical testing across micro- and meso- length scales

Gigax, Jonathan; Torrez, Avery; McCulloch, Q.; Li, Nan

doi:10.2172/1565831

Cited by 1 publication

(1 citation statement)

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“…As was discussed above, many have endeavored to use a spherical nanoindenter tip probe to measure small-scale stress-strain curves with limited or variable degrees of success [47]. However, spherical nanoindentation includes several practical difficulties because the uncertainty in the contact area is generally more significant for spheres than for other indenter shapes (see the variation in an asmanufactured cono-spherical tip geometry obtained from a leading tip supplier for more nuanced appreciation, as shown in Figures 4-7, which are adopted from [10].…”

Section: Actualization Of a Frustrum Instrumented Strength Microprobementioning

confidence: 99%

Toward an Instrumented Strength Microprobe – Origins of the Oliver-Pharr Method and Continued Advancements in Nanoindentation: Part 2

Sousa¹,

Hay²,

Cote³

2023

Elasticity of Materials

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Numerable advancements have afforded many benefits to nanoindenter system operators since the late 20th century, such as automation of measurements, enhanced load and displacement resolutions, and indentation with in-situ capabilities. Accordingly, the present chapter details how the Oliver-Pharr method of nanoindentation testing and analysis was adopted and relied upon as a framework that brought about widespread advancements in instrumented indentation testing. The present chapter introduces an emergent and theoretically consistent approach to assessing true stress–strain curves at a micromechanical scale using a flat-punch nanoindenter tip geometry and reliance upon Hollomon power-law plasticity and constitutive parameter fitting. Finally, a novel flat-punch nanoindentation testing method and approach to plasticity parameter analysis for metallic materials using nanoindentation systems can be implemented, bringing about an instrumented strength microprobe – a long sought-after tool.

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Section: Actualization Of a Frustrum Instrumented Strength Microprobementioning

confidence: 99%