考虑应力多轴性和平均应力影响的工作辊疲劳裂纹萌生寿命研究  

Research on Fatigue Crack Initial Life Prediction of Work Rolls Considering Stress Multiaxiality and Mean Stress

作　　者：聂宜波 张志旭 蔚辰 NIE Yibo;ZHANG Zhixu;WEI Chen(School of Mechanical Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学机械工程学院,合肥230009

出　　处：《机械工程师》2024年第11期55-60,65,共7页Mechanical Engineer

基　　金：国家自然科学基金“多域损伤竞争下的冶金轧辊主动再制造时机预测方法研究”(51975176)。

摘　　要：为了研究工作辊在热轧过程中的疲劳裂纹萌生寿命,建立了工作辊热轧过程模型,应用通用斜坡公式,并考虑了应力多轴性及平均应力的影响。结果表明:当应力为压应力时,应力多轴性使得工作辊疲劳裂纹寿命计算值提高近8倍,考虑平均应力影响的寿命提高22.3%,两者影响均不可忽略。工作辊整体疲劳裂纹萌生寿命为29238 r,工作辊疲劳裂纹萌生寿命的研究对于确定换辊修磨时机有一定理论指导意义,为再制造时机预测做了前提研究。In order to study the fatigue crack initiation life of work roll in hot rolling,a process model of work roll in hot rolling is established.The general slope formula is used,and the influence of stress multiaxiality and mean stress is considered.The results show that when the stress is compressive stress,the fatigue crack life of work roll is increased by nearly 8 times due to the stress multiaxiality,and the fatigue crack life is increased by 22.3%considering the influence of the mean stress.The fatigue crack initiation life of the work roll is 29238 r.The research on the fatigue crack initiation life of the work roll has a certain theoretical guiding significance for determining the timing of roll change and grinding,and makes a prerequisite research for predicting the timing of remanufacturing.

关 键 词：热力耦合 疲劳裂纹萌生寿命 应力多轴性 平均应力 

分 类 号：TG333[金属学及工艺—金属压力加工]