基于斷裂力學(xué)方法的粉末盤低周疲勞壽命預(yù)測
[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.
【作者單位】: 中航商用航空發(fā)動機(jī)有限責(zé)任公司上海商用飛機(jī)發(fā)動機(jī)工程技術(shù)研究中心;上海量維信息科技有限公司;
【基金】:上海市“引進(jìn)技術(shù)消化與吸收”專項資金(12XI-04) 上海科委科研計劃項目(13DJ1400200)資助
【分類號】:V231.95
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