【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。更多还原

【Abstract】 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 microscopic 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.更多还原