粉末冶金材料空穴和夹杂的疲劳蠕变损伤分析

Analysis on Fatigue and Creep Damage of Powder Metallurgy Material with Void and Inclusion

基于Gurson塑性本构模型对含空穴和夹杂的镍基粉末冶金材料Fgh95进行了疲劳蠕变性能分析。采用K-R损伤模型对含空穴和夹杂的粉末冶金材料Fgh95进行了高温蠕变及疲劳-蠕变交互作用性能研究。结果表明:在疲劳载荷和高温蠕变载荷作用下,空穴比夹杂更易引起粉末冶金材料的损伤失效,相对高温蠕变载荷而言,疲劳-蠕变交互作用更易引起材料的破坏,且疲劳-蠕变交互作用对含夹杂材料的影响大于含空穴材料。

The fatigue behaviors of powder metallurgy materials Fgh95 with void and inclusion were analyzed by Gurson constitutive model. The creep and fatigue-creep interaction behaviors of powder metallurgy materials with void and inclusion were studied by K-R damage model. The research results show that the void has more strong influence than the inclusion on the material damage in the fatigue loading and creep loading at high temperature. The inclusion has more strong influence than t he void on the material damage in the fatigue-creep loading. The fatigue-creep interaction load can cause the damage of material more easily than creep load. The results show that the void and inclusion can cause the damage of material under different load.