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机器零件的耐久性取决于许多因素,但目前人们认为屈服强度σ_T与脆性转变温度T_(xp)是决定零件耐久性的主要机械性能指示。当T_(xp)/σ_T之比值为最大负值时,零件拥有最高的耐
The durability of machine parts depends on many factors, but at present it is thought that the yield strength σ_T and the brittle transition temperature T_ (xp) are the main indications of mechanical properties that determine part durability. When the ratio of T_ (xp) / σ_T is the maximum negative value, the part has the highest resistance