具有复杂构造的随机载对结构材料的热效应

温度对材料的耐久性有着直接的影响。循环荷载可引起热效应。热效应是变形与破坏动态过程所致 ,是亚稳状态分解的结果 ,是过剩能量消耗的一种形式 ,并认为热释放由裂纹产生过程所致。首先讨论了具有复杂构造的随机载对结构材料的热效应 ,方法的核心为逐步消去中间的过渡循环 ,使之变成简单随机过程。然后又假定简单随机过程由幅值随机的完整周期振动构成 ,频率为单位时间内零穿越次数 ,并最后求得耗散系数 ,闭合了热传导方程 ,最后讨论了各种热状态。

Heating Effect of Structural Material Under Random Loading with Complex Structures

Temperature has a direct effect upon the durability of solid materials. Cyclic loading may cause heating. As a result of deformation, fracture, and collapse of metastable state, heating effect is considered as a form of dissipation of surplus energy, governed by the initiation process of cracks. This paper deals with the calculating method of heating under random loading with complex structures. By excluding intermediate cycles and changing random process with complex strcutures into that with simple structures, which is treated as harmonic vibration with stochastic amplitudes, dissipation function and heat transfer equation are obtained. Finally the paper discusses the different states of heating.