摘要
孔洞型损伤是延性金属材料一种常见的破坏形式。对于材料疲劳蠕变破坏过程,文中提出等效孔洞体积概念,从微观唯象角度出发,综合考虑疲劳蠕变对孔洞体积长大的影响,得到一种微孔洞型疲劳蠕变寿命预测模型。以此模型对1.25Cr0.5Mo钢540℃应力控制下疲劳蠕变寿命进行预测,结果显示该模型具有很好的适用性。
Void damage is a common failure model for ductile metallic materials. The concept of equivalent void volume during the process of material fatigue-creep failure is presented and from the macroscopic phenomenological view, a new microvoids life prediction model based on microvoids volume for material fatigue-creep life is put forward. The effect of fatigue and creep to the development of void is synthetically considered in the model. 1.25Cr0.5Mo steel fatigue-creep lives under stress control are evaluated at 540 C by this model and the results show the applicability of the model.
出处
《机械强度》
CAS
CSCD
北大核心
2009年第4期661-663,共3页
Journal of Mechanical Strength
基金
国家“十一五”科技支撑计划专题(2006BAK02B02)
安徽省自然科学基金(070415223)~~
关键词
材料损伤
微观孔洞
疲劳蠕变
寿命预测
Material damage
Microvoids
Fatigue creep
Life prediction
