机构地区: 南京航空航天大学能源与动力学院动力工程系
出 处: 《南京航空航天大学学报》 1997年第5期593-599,共7页
摘 要: 综述了Bodner-Partom统一弹-粘塑性本构模型的基本理论,包括流动法则、运动方程和内变量演变方程三个部分。该模型是基于位错动力学的思想提出来的,认为材料变形的应变率由弹性和非弹性两部分组成,它们始终耦合在一起,采用内变量来表示材料抵抗塑性变形的非弹性状态,内变量包括各向同性硬化和方向性硬化两种。该模型不需要屈服准则和加卸载准则,具有较强的模拟能力,能模拟循环硬化与循环软化、非比例加载引起的附加硬化、热恢复、温度相关、损伤的演变等。文中还阐述了该模型材料参数的温度相关性及其在航空发动机高温合金中的应用,并对该模型的前景进行了预测。 Summarizes the Bodner Partom unified elastic viscoplastic constitutive equations, including three parts,such as the flow laws, the kinetic equation and the evolution equations of internal variables. The model is developed from dislocation dynamics. The total strain rate is assumed to be composed of elastic and plastic components, which are coupled under all loading and unloading conditions. The inelastic state is expressed by internal variables. Yield criterion and loading and unloading criterion are not required in this model. Bodner Partom model can simulate the cyclic hardening or softening,additional hardening due to non proportional loading, thermal recovery, temperature dependence, damage development and so on. The paper also comments on the temperature dependence of the material constants. Finally the application of the model on aeroengine superalloys is introduced and the prospect of this model is predicted.