基于连续损伤力学理论,利用FORTRAN语言开发了多因素耦合下材料损伤发展的ABAQUS用户子程序,模拟了1050℃温度下,蠕变-渗碳耦合作用的Cr35Ni45Nb钢损伤发展过程.结果表明:承受单一蠕变损伤的炉管外壁最先失效,而承受蠕变-渗碳耦合作用下的炉管内壁最先开裂.单一蠕变因素下Cr35Ni45Nb钢的内壁Von-mises应力和最大主应力随着服役时间的延长出现先降低后增长的趋势.外壁的Von-mises值和最大主应力随着服役时间的延长而增大,从而导致炉管外壁的损伤发展速率高于内壁.蠕变-渗碳耦合作用下Cr35Ni45Nb钢的内壁Von-mises应力和最大主应力随着服役时间的延长而降低,而外壁则相反.
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