基于断裂力学方法的粉末盘低周疲劳寿命预测
发布时间：2019-01-08 21:08
【摘要】：为克服传统寿命预测未能考虑粉末合金夹杂物的缺陷,在某粉末封严盘定寿过程中,使用计算断裂力学方法模拟了夹杂缺陷从初始状态一直增大到可检尺度的扩展过程,并将该过程经历的循环数作为裂纹萌生寿命。在考虑小裂纹扩展速率修正的情况下萌生寿命为1639循环,若不采用修正则为4956循环,说明忽略"小裂纹效应"会得出偏于危险的萌生寿命计算结果。对含裂纹有限元模型的建立、裂纹扩展寿命计算中积分路径的选取等问题进行了讨论。使用断裂力学方法预测裂纹萌生寿命需要重复多次有限元计算及前沿光顺化处理,时间耗费较大,但在精确定量分析方面具有优势,可作为现有方法的有益补充,为发动机限寿件检修周期的确定提供依据。
[Abstract]:In order to overcome the defects of powder alloy inclusions which were not considered in traditional life prediction, the expansion process of inclusions from initial state to detectable scale was simulated by using the method of computational fracture mechanics in the process of determining the life of a powder sealing plate. The cycle number of the process is taken as the crack initiation life. The life of initiation is 1639 cycles considering the correction of the growth rate of small cracks, and 4956 cycles if no correction is adopted. It is shown that ignoring the "small crack effect" will result in dangerous results of life initiation. The establishment of finite element model with crack and the selection of integral path in the calculation of crack propagation life are discussed. The prediction of crack initiation life by using fracture mechanics method requires repeated finite element calculation and front photo-hue treatment, which is time-consuming, but it has advantages in accurate quantitative analysis and can be used as a useful supplement to the existing methods. It provides the basis for the determination of the maintenance period of the engine life-limited parts.
【作者单位】： 中航商用航空发动机有限责任公司上海商用飞机发动机工程技术研究中心;上海量维信息科技有限公司;
【基金】：上海市“引进技术消化与吸收”专项资金(12XI-04) 上海科委科研计划项目(13DJ1400200)资助
【分类号】：V231.95
本文编号：2405122
[Abstract]:In order to overcome the defects of powder alloy inclusions which were not considered in traditional life prediction, the expansion process of inclusions from initial state to detectable scale was simulated by using the method of computational fracture mechanics in the process of determining the life of a powder sealing plate. The cycle number of the process is taken as the crack initiation life. The life of initiation is 1639 cycles considering the correction of the growth rate of small cracks, and 4956 cycles if no correction is adopted. It is shown that ignoring the "small crack effect" will result in dangerous results of life initiation. The establishment of finite element model with crack and the selection of integral path in the calculation of crack propagation life are discussed. The prediction of crack initiation life by using fracture mechanics method requires repeated finite element calculation and front photo-hue treatment, which is time-consuming, but it has advantages in accurate quantitative analysis and can be used as a useful supplement to the existing methods. It provides the basis for the determination of the maintenance period of the engine life-limited parts.
【作者单位】： 中航商用航空发动机有限责任公司上海商用飞机发动机工程技术研究中心;上海量维信息科技有限公司;
【基金】：上海市“引进技术消化与吸收”专项资金(12XI-04) 上海科委科研计划项目(13DJ1400200)资助
【分类号】：V231.95
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