摘要
建立了概率模型表达短裂纹的扩展。该模型基于Ｍａｒｃｏｖ链理论，建立直接ａ－Ｎ关系以减小由于处理ｄａ／ｄＮ数据而造成的精度损失。由试验获得的ａ－Ｎ数据形成一个概率转移矩阵Ｐ＿ｋ＝Ｐ＿０Ｐ￣ｋ，通过变换前处理过程模拟裂纹扩展，并给出累积分布函数。通过断裂力学及统计分析，建议以最小方差点作为微观短裂纹与工程短裂纹的分界点。
A probabilistic model is developed in this article to express the propagation of short cracks.Adirect a-N growth model is established to avoid the decline of calculation accuracy caused by dealingwith da/dN data. a probabilistic transformation matrix P_k=P_0P￣K is formed. which can simulate anyshort fatigue crack growth process by a change in its entry procedure and provide a cumulative distri-bution function. Based on the fracture mechanics anatysis and statistical analysis,the least variancepoint is suggested
出处
《西北大学学报（自然科学版）》
CAS
CSCD
1994年第5期387-391,共5页
Journal of Northwest University（Natural Science Edition）
基金
航空基金
关键词
疲劳
短裂纹
概率模型
裂纹扩展
fatigue short crack Marcov-chain probabilistic model
