蠕变-疲劳交互作用对高温低周疲劳寿命影响  

Creep-fatigue interaction on fatigue life under high-temperature

作　　者：王正[1] 刘蔚[1] 苑宇[1] 何鑫 

机构地区：[1]大连理工大学动力工程系,辽宁大连116023 [2]大连物理化学研究所,辽宁大连116021

出　　处：《石油化工设备》2003年第4期1-4,共4页Petro-Chemical Equipment

基　　金：辽宁自然科学基金项目(962032)

摘　　要：多维应力状态下蠕变 疲劳交互作用对疲劳寿命(疲劳总寿命和裂纹扩展寿命)影响的研究表明,2.25Cr 1Mo材料无保持周期应变控制的疲劳总寿命和裂纹扩展寿命可用其疲劳成分、蠕变成分和蠕变 疲劳交互作用成分3者的非线性组合来表征,即整个试样的失效过程中存在着蠕变 疲劳交互作用,且其蠕变和疲劳之间是正交互作用。由于这种蠕变 疲劳正交互作用的存在导致了试样或构件的疲劳总寿命和裂纹扩展寿命的降低。利用Matlab对试验结果进行非线性多元回归,得到了用疲劳成分、蠕变成分和蠕变 疲劳交互成分表征的疲劳总寿命方程,定量地表征了该材料蠕变 疲劳交互作用下的疲劳总寿命和裂纹扩展寿命。?The study on creepfatigue interaction on fatigue life and fatigue crack propagation life shows that the fatigue life and fatigue crack propagation life under the strain control without holding time can be characterized by the nonlinear combination of the fatigue component,creep component and creepfatigue interaction component,that is to say,the creepfatigue interaction is existent in the course of the failure,and the creep and fatigue interaction is the positive interaction The fatigue life and fatigue crack propagation life become lower for the existence of creepfatigue interactionThe fatigue life and fatigue crack propagation life are quantitatively characterized by their fatigue component, creep component and creepfatigue component

关 键 词：多维应力状态 高温 疲劳 蠕变—疲劳交互作用 寿命 

分 类 号：O344.6[理学—固体力学] O346.2[理学—力学]