基于损伤力学的铸轧辊套疲劳寿命的研究
Study on Fatigue Life of Roll Shell in Continuous Roll Casting Based on Damage Mechanics
刘晓波1， 陈 睿2
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作者单位：1. 南昌航空大学 航空制造工程学院，江西 南昌330063；2.江西理工大学 机电工程学院，江西 赣州341000
中文关键字：铸轧；辊套；应力场；疲劳寿命；损伤度
英文关键字：roll casting; roll shell; stress field; fatigue life; damage depth
中文摘要：分析铸轧辊套的疲劳失效机理，然后应用损伤力学理论，将辊套疲劳裂纹产生和裂纹扩展有机地结合在一起考虑，在应力场已知的情况下，采用损伤力学-有限元法对辊套的损伤场进行了分析，估算了裂纹扩展的寿命，并给出了具体分析步骤。最后，通过具体的算例，验证了整个分析计算过程的可行性。该研究方法改变了研究辊套裂纹形成与裂纹扩展两个单独处理的现状，而使其成为一个完整的统一的分析过程。通过分析计算结果可知：辊套的疲劳寿命与辊套材料的热疲劳性能、导热能力、热膨胀系数以及表面加工质量直接相关，从而为提高辊套使用寿命提供了有价值的参考。
英文摘要：The fatigue failure mechanism of roll shell was analysed, the stages of crack initiating and crack propagation were closely taken into consideration by using the theory of continuum damage mechanics. Under the given stress field, the damage field was analysed and the crack expansion life was estimated by using FEM, and the concrete analysis steps were given out. Finally the feasibility of the method was validated through practical example. The research method which change the status that crack generation and crack expansion were analysed respectively, and built an entire and unitive analysis procedure. The results show that the fatigue life of roll shell is directly related to thermal fatigue, heat conduction, thermal expansion coefficient and surface machining quality of material of roll shell, which provides important and valuable reference to improving service life of roll shell.