Abstract
Recently, because the micro-machine is noticed and electronic equipments are made much lighter and smaller, the demand for micro materials is increasing. The researches for elucidating the mechanical properties of micro materials, which are called micro testing, have been carried out and it has been turned out that the micro materials are different from the bulk materials on the mechanical properties. However the mechanical properties data of the micro materials obviously run short and the evaluation method of micro materials is different according to the researcher. Therefore, the establishment of the test method for the micro materials is very necessary. The purpose of this study is to establish a test method of tensile strength for the micro materials and to investigate the mechanical properties of the micro materials. Then, the tensile strength tests of SUS304 thin sheet were carried out using micro force testing system (MTS Tytron250), and the effect of the thickness, the width and the shape of specimen on mechanical properties was investigated. As the results of experiment, it was seen that Young's modulus E decreased with increasing the thickness, and that the specimens of 80, 500 and 1000μm thickness differed from the specimens of 20μm thickness in the mode of plastic deformation, the correlation of tensile strength σ_B and thickness, and correlation of the fracture elongation ε_f and thickness.
