基于信息熵的铝合金焊接接头疲劳寿命分析方法  

Fatigue life analysis method of aluminum alloy welded joints based on information entropy

作　　者：刘亚良[1,2] 孙屹博 邹丽[1,2] 杨鑫华[1,2] 

机构地区：[1]大连交通大学材料科学与工程学院,大连116028 [2]大连交通大学辽宁省轨道交通装备焊接与可靠性重点实验室,大连116028

出　　处：《焊接学报》2018年第4期67-72,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51175054);辽宁省自然科学基金资助项目(2015020169)

摘　　要：建立了基于信息熵的铝合金焊接接头疲劳数据分析模型,通过对比分析各决策属性的信息分熵,研究了应力集中、板厚与载荷类型等因素对焊接结构疲劳破坏的定量贡献.结果表明,三种应力类型疲劳数据分布的信息总熵分别为0.997 7,0.910 0和0.817 9,基于权重信息熵的降低的总趋势与S-N曲线标准偏差越来越小的情况存在一致性.对于基于结构应力的疲劳数据分布,膜应力集中系数(SCF_m)基于权重的信息分熵为0.6754,对于结构应力疲劳数据分布起主要作用;对于等效结构应力,应力比的基于权重的信息分熵为0.622 3,说明应力比对于等效结构应力疲劳数据分布起重要作用.An analysis model of aluminum alloy welded joints fatigue data based on information entropy is proposed in this paper. Through calculating and analyzing the information entropy of decision attributes,quantitative contribution of stress concentration,plate thickness and loading mode to the fatigue destruction are researched. The results show that the total information entropy of the fatigue data based on three stress types are respectively 0. 997 7,0. 910 0 and 0. 817 9. There is consistency between the reducing trend of the weighted information entropy and the declining standard deviation of the S-N curves. In the S-N curve based on the structure stress,the weighted information entropy of membrane stress concentration factor( SCFm) is0. 675 4,which plays a major role in the distribution of fatigue data. In the S-N curve based on the equivalent structure stress,the weighted information entropy of stress ratio is 0. 622 3,which indicates that stress ratio is an important factor that influences the distribution of fatigue data.

关 键 词：信息熵 焊接 疲劳寿命 等效结构应力 

分 类 号：TG409[金属学及工艺—焊接]