考虑加载次序影响的改进M-H模型  

AN IMPROVED M-H MODEL CONSIDERING LOADING SEQUENCE EFFECT

作　　者：范文亮[1,2] 李正良[1,2] 李明亮 FAN Wen-liang;LI Zheng-liang;LI Ming-liang(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University),Ministry of Education,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]山地城镇建设与新技术教育部重点实验室(重庆大学),重庆400045

出　　处：《工程力学》2025年第4期179-186,共8页Engineering Mechanics

基　　金：国家电网有限公司科技项目(5200-202156071A-0-0-00)。

摘　　要：传统的M-H模型不能考虑加载次序对后续疲劳累积损伤模型的影响,考虑加载次序对模型影响的改进M-H模型大多通过修改寿命比特征指数实现,可推广性受限。该文建议了一种更易推广的考虑加载次序影响的方式,即等效循环比,给出了改进M-H模型的一般形式;并建议了可实用的等效循环比表达式,提出了一种新的改进M-H模型。借助已有试验数据验证了建议的改进M-H模型的准确性,且通过与现有模型的对比体现了该文中模型的较优精度与广泛适用性。The traditional M-H model cannot consider loading sequence effect,and in most of the improved M-H models,one parameter of traditional M-H model,namely the life ratio characteristic exponent,is modified to consider the effect of loading sequence.The generalizability of this modification is limited.A more generalized framework for considering loading sequence effect by the equivalent cycle ratio is presented for improving the M-H model.Based on a feasible formula of the equivalent cycle ratio,a new and practical improved M-H model is proposed.The accuracy of the proposed model is verified by existing experimental data,and better accuracy and wider applicability of the proposed model are demonstrated through a comparison with the existing models.

关 键 词：金属材料 疲劳损伤累积 加载次序影响 等效循环比 M-H模型 

分 类 号：O346.2[理学—固体力学]