An Evaluation of Mechanical Properties on Metallic Materials and Its Size Dependency by using Small Specimens

Tensile tests were conducted with millimeter specimens in overall length using various metallic materials, steel, aluminum, titanium and solder, to clarify the size effect on mechanical and physical properties, for the purpose of evaluating strength distribution in trial products and small material samples. As the results, it is obvious that tensile strength and Young’s modulus do not have the size effect; however, fracture elongation has the size effect in some cases. Crystal orientation analysis of high tensile steel plate specimens show that strain by external force induce heterogeneous of crystal orientation and orienting to [101] direction to the tensile axis as preferred orientation. These crystalline changes arise easily in smaller specimen and cause the growth of elongation, and the fracture elongations obtained by small specimen are estimated by Oliver’s formula. In addition, the difference in tensile strength and fracture elongation of locations in die-casted material have been found out.