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多向应力作用下的金属材料热疲劳问题．在７０年代初，日本学者平修工，井上达 雄等人曾进行过研究，提出了用当量应变范围评价多向应力作用下的热疲劳寿命方法． 作者在此基础上．对合金材料ＧＨ３６在较大应变范围下的热疲劳问题进行了研究。 试验机为热裂型．瞬时应力和应变用有限元法求出，然后定出裂纹萌生点的当量应变 范围。结果表明；在相同的当量应变范围，裂纹长度小于０．２ｍｍ；热疲劳寿命比当 量温度下的高温低周疲劳寿命低；当裂纹长度等于０．２ｍｍ，热疲劳寿命与当量温度 下的高温低周疲劳寿命相同。
Thermal Fatigue Problems of Metallic Materials under Multiaxial Stress. In the early 1970s, Japanese scholars repair workers, Inoue Takahiro and others who had conducted a study, put forward the equivalent strain range to evaluate the thermal fatigue life under multi-directional stress method. On this basis, the author The thermal fatigue of alloy GH36 under a large strain range was studied. Tester for the thermal cracking type. The instantaneous stress and strain are calculated by the finite element method, and then the equivalent strain range of the crack initiation point is determined. The results show that the crack length is less than 0.2mm in the same equivalent strain range and the thermal fatigue life is lower than the high temperature and low cycle fatigue life under equivalent temperature. When the crack length is equal to 0.2mm, the thermal fatigue life is lower than the high temperature under equivalent temperature Week fatigue life the same.