【摘要】 根据光滑拉压疲劳试验的循环加载滞后回线,分别测得5CrNiMo和5Cr2NiMoVSi钢在拉伸半周的初始弹性模量E_o,以及经不同循环周次N_i的受损弹性模量E_ni。提出了低周疲劳过程中钢的弹性模量损失率D的表达式:D=E₀-E_ni/E₀×100% 分析表明,D值随循环应变幅△ε,/2和循环周次N的增加而增加,弹性模量损失率对疲劳损伤过程较敏感,其值大小可用作表征材料损伤的程度,是疲劳损伤的一种物理参量。更多还原

【Abstract】 According to the cyclic hysteresis loop during fatigue test of smooth specimenes, initial value E₀ of elasticity modulus of 5CrNiMo and 5Cr2NiMoVSi steels at tensite half-cycle and damaged elasticity modulus E_ni during different cyclic number N were measured respectively. The expression of elasticity modulus loss rate D of steel has been raised: The results indicated that value D increases as the cyclic strain amplitude 1/2Δε₁ and cyclic number N increase. Rate of elasticity modulus loss is sensitive to damage process of fatigue. Its value may be used to indicate the damage degree of material, and is a physical parameter of fatigue damage.更多还原