静強度パラメータ間の相関関係

Abstract

The data of static mechanical properties of many kinds of ferrous metals were sampled from the database on the fatigue stength of metallic materials in JSMS. The correlations among various mechanical properties were investigated. When brinell hardness and Rockwell hardness were converted into the corresponding Vikers hardness, the relation between Vikers hardness and tensile strength can be expressed as linear. The relation between yield strength (yield stress or 0.2% proof stress) and tensile strength can be classified into two groups, each of which has a linear relationship. The first group contains low strength steels such as annealed carbon steels, normalize carbon steels and quenched and tempered carbon steels ( 0.30%C) etc.. The relationship between elongation and tensile strength in all irons and steels can be expressed as an exponential function. The data of austenitic steels and cast irons deviate from the relationship. The relation between reduction of area and tensile strength is expressed as three groups with linear relationship. The first group contains normalized and annealed carbon steels and quenched and tempered carbon steels ( 0.30%C). The third group contains alloy steels.