Dual flat-spherical indentation for extracting elastic–plastic properties from rough metallic surfaces

Marimuthu, Karuppasamy Pandian; Park, Soowan; Jeong, Uihwan; Lee, Hyungyil

doi:10.1016/j.matdes.2021.109909

Cited by 14 publications

(1 citation statement)

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“…Flatting rough surfaces is another effective approach to reducing the influence of surface roughness on IIT. In this method, a flat indenter is used to locally flatten the rough surface, and then spherical indentation testing is performed at the same position [34]. However, using this method on metallic materials will introduce additional residual stress during the flattening process, and in addition, the required indentation loads often exceed the capacity of portable indentation devices [35], Therefore, it is essential to study the influence of surface roughness on the measurement of instrumented spherical indentations, and propose corresponding solutions to facilitate the determination of mechanical properties of in-service structures using portable indentation devices.…”

Section: Introductionmentioning

confidence: 99%

On determination of elastic modulus and indentation hardness by instrumented spherical indentation: influence of surface roughness and correction method

Peng

Liu

et al. 2023

Mater. Res. Express

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Although, surface roughness can influence the determination of elastic moduli and indentation hardness to some extent by instrumented spherical indentation test, limited work has been done to quantitatively reveal and minimize these influences. In the present work, through a large number of finite element (FE) simulations and analyses, we clarified the evolution trend of determined elastic moduli and indentation hardness corresponding to different normalized indentation depths (h/R) and normalized roughness (Sq/R). On this basis, an area correction method was proposed to improve the measurement accuracy in the elastic moduli and indentation hardness. The FE results show that, with the newly proposed correction method, the maximum relative error in determined elastic moduli is reduced from about ±7% to ±2%, and that in the determined indentation hardness is reduced from about ±13% to ±5%, when Sq/R ≤ 2.2 × 10-3 and h/R = 5%. Applications were then illustrated on four typical metallic materials (i.e., AA 7075, AA 2014, steel 316L, and copper T2). The experimental results demonstrate that the proposed correction method is able to mitigate the effects of surface roughness on the determination of elastic moduli and indentation hardness to obtain more correct results.

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Section: Introductionmentioning

confidence: 99%