114 Effects of Experimental Parameters on Accuracy in Estimating the Yield Stress by Spherica Nano-indentation

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  • 114 球状圧子ナノインデンテーションによる降伏応力同定の高精度化に関する検討(構造部材や加工プロセスの信頼性を支える計測・評価技術)

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It is known that stress-strain relations of a material can be obtained using a nano-indentation technique with a spherical tip. In this work, the effects of the experimental parameters on the accuracy in estimating stress-strain curve and yield stress by multiple continuous loading method using a load-controlled nano-indentation. Experimental parameters such as initial indentation, indentation time relating to deformation rate, holding time at maximum loading, and unloading ratio are changed and the influence on the obtained result is investigated. It has been found that the indentation time and the holding time seems to affect the stress-strain curve and yield stress.

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