Effect of Grain Size on the Strength Characteristics of the Thin Sheets of SUS304 Stainless(Mechanical Behavior of Materials 1)

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It is predicted that next generation micromachines and electronic equipments will be made much lighter and smaller. Consequently the micron-sized parts as the structural members are required, however, it is expected that the micro materials are different from the bulk materials on the mechanical properties. It is important to understand the mechanical property of the micro materials for using as the structural members. Therefore, the establishment of the test method for the micro materials is very necessary. The effects of the test method, the processing method, the shape, the size and the grain size of specimens on the tensile strength of the micro materials have been reported until now. However, the reliability and the accumulation of the experimental data are insufficient, and the evaluation method of the tensile strength for thin sheet materials has not been established. The purpose of this study is to establish a test method of tensile strength and to investigate the strength characteristics of the micro materials. Then, the tensile strength tests of SUS304 thin sheets were carried out using a microforce testing system (MTS Tytron250), and the effect of sheet thickness and grain size of the test specimen on tensile strength and Young modulus was investigated. As results, it was found that though scatter of Young's modulus was large, and the mean values of Young's modulus were E=191GPa regardless of the gage length. Also, it was found that the 0.2% proof stress σ_<0.2> increases as t/d increased up to t/d=2〜4, and that it was almost constant over t/d=2〜4. The causes for these are discussed
一般社団法人日本機械学会の論文
2001-10-20

Effect of Grain Size on the Strength Characteristics of the Thin Sheets of SUS304 Stainless(Mechanical Behavior of Materials 1)

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