前稳态

通过比较不同的断裂准则，考虑了裂纹失稳扩展前的稳态裂纹累计，根据J积分撕裂模量法建立了裂纹失稳的失效评定图。

The failure assessment diagram of instability of crack propagation was also obtained after the comparison of some fracture criteria , which considered the accumulation of crack propagation before loosing its stability .

并对瞬态试验前的稳态温度场进行了数值模拟，通过与稳态试验数值的比较，来验证实验件的温度场分布。物理设计是瞬态试验能够顺利和安全进行的关键。

In order to verify the experimental results , numerical simulation of the steady temperature field is carried out before the transient experiment . Temperature field is rectified by comparison of data between the simulation and experiment .

前苏联非稳态转化法存在的问题及其解决途径

Problems and Their Solving Way of Unsteady-State Process for SO_2 Oxidation in Former Soviet Union