修正Jhansale模型下材料随机交变加载应力应变分析

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根据不同循环加载次数下材料循环应力一应变曲线的变化特点，利用材料屈服强度增量对不同循环次数下Jhansale模型骨架曲线进行修正，并分别针对硬化／软化材料利用修正的Jhansale模型进行随机交变加载下材料的应力应变分析．分析结果表明：与修正前模型相比，修正后模型的分析结果不仅符合材料记忆特性，而且可以反映材料循环硬化／软化的瞬态效应，对硬化／软化材料在循环加载下应力应变状态的描述更加准确． According to the variational characteristics of cyclic stress-strain curves of the material subjec- ted to loading with different number of cycle, the skeleton curves of the Jhansale model with different cy- clic number were revised by using yield strength increment and then the stress and strain in the hardened and softened materials subjected to random alternative loading were respectively analyzed with the revised Jhansale model. The analysis result showed that this model was not only conformable to the material memorizing character but could also reflect the cyclic hardening and softening transient effect and more ac- curately describe the stress and strain state in the hardened or softened material subjected to cyclic loading.