微小引張試験片を用いた局所機械的特性評価法の開発と塑性加工材への適用

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We developed a noble technique of micro mechanical tensile testing to evaluate local mechanical properties in cold-worked materials. The specimen used here was a cold drawn austenitic stainless steel (Type 316L) rod. A cold work generally varies the mechanical properties (especially plastic properties), and thus leads the property to nonhomogeneous distribution in the material. To evaluate local mechanical properties in such cold-worked materials, we developed the technique of micro tensile test to examine a stress-strain curve of a limited area (smaller than 1mm^2) of interest. The specimens with gage length of 5mm and cross section of 1.2×0.7mm rectangle were machined from the rod using wire-electrical discharge machining to achieve little formation of work hardened surface layer during the fabricaiton process. For the as-received material, the stress-strain curve obtained by the present technique exhibited excellent agreement with that from the general tensile test based on JIS Z 2241. When the technique was applied to the cold-worked material, it was found that near the surface of worked rod, yield stress, tensile strength and residual plastic strain were higher, while fracture strain was lower. In parallel with the experiment, finite element analysis was carried out to compute the distribution of residual plastic strain after cold drawn, indicating the good agreement with that obtained from the present technique. It is thus revealed that the developed technique can quantitatively evaluate the local mechanical properties, and thus supply us rich information on nonhomogeneously-distributed properties in plastic worked materials.
2010-04-25

微小引張試験片を用いた局所機械的特性評価法の開発と塑性加工材への適用

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