FATIGUE LIFE PREDICTION OF HEAT-TREATED CARBON STEELS AND LOW ALLOY STEELS BASED ON A SMALL CRACK GROWTH LAW
FATIGUE LIFE PREDICTION OF HEAT-TREATED CARBON STEELS AND LOW ALLOY STEELS BASED ON A SMALL CRACK GROWTH LAW
复制标题
基于小裂纹扩展定律的热处理碳钢和低合金钢疲劳寿命预测
DOI：
10.1111/j.1460-2695.1994.tb00799.x
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发表时间：
1994
影响因子：
3.7
通讯作者：
H. Nisitani
中科院分区：
文献类型：
--
作者：
M. Goto;H. Nisitani
摘要-由于热处理高强度钢通常用作在恶劣工作条件下运行的机器和结构的材料，因此评估其疲劳寿命非常重要。因此，为了估算机器和结构的疲劳寿命，必须知道小疲劳裂纹的扩展规律，因为这些构件的寿命主要由小裂纹的行为控制。小裂纹的扩展速率通常不能用线弹性断裂力学来预测，但可以用σnal项唯一地确定，其中σa是应力幅，l是裂纹长度，n是材料常数。本文研究了热处理碳钢和低合金钢的小裂纹扩展规律。本文根据小裂纹扩展规律dl/dN= C_3（σ_a/σ_a）n_1（σ_u为极限抗拉强度），提出了一种预测不同抗拉强度等级的热处理钢小裂纹扩展寿命的有效而简便的方法，并提出了一种确定平面构件疲劳寿命的方法。
Abstract— Since heat-treated high strength steels are often used as materials for machines and structures that operate under severe service conditions, it is important to evaluate their fatigue life. Hence the growth law of a small fatigue crack must be known in order to estimate the fatigue life of machines and structures since the life of such members is controlled mainly by the behaviour of a small crack. The growth rate of a small crack can not be predicted usually by linear elastic fracture mechanics, but can be determined uniquely by the term σnal, where σa is stress amplitude, l is crack length and n is a material constant. In this paper, the small-crack growth law of heat-treated carbon steels and low alloy steels was studied. An effective and convenient method based on a small-crack growth law, dl/dN=C3(σa/σa)nl is proposed, where σu is the ultimate tensile strength, for predicting the small crack propagation life of heat- treated steels with different tensile strength levels, together with a method for determining the fatigue life of plain members.