基于斷裂力學方法的粉末盤低周疲勞壽命預測
發(fā)布時間:2019-01-08 21:08
【摘要】:為克服傳統(tǒng)壽命預測未能考慮粉末合金夾雜物的缺陷,在某粉末封嚴盤定壽過程中,使用計算斷裂力學方法模擬了夾雜缺陷從初始狀態(tài)一直增大到可檢尺度的擴展過程,并將該過程經(jīng)歷的循環(huán)數(shù)作為裂紋萌生壽命。在考慮小裂紋擴展速率修正的情況下萌生壽命為1639循環(huán),若不采用修正則為4956循環(huán),說明忽略"小裂紋效應"會得出偏于危險的萌生壽命計算結果。對含裂紋有限元模型的建立、裂紋擴展壽命計算中積分路徑的選取等問題進行了討論。使用斷裂力學方法預測裂紋萌生壽命需要重復多次有限元計算及前沿光順化處理,時間耗費較大,但在精確定量分析方面具有優(yōu)勢,可作為現(xiàn)有方法的有益補充,為發(fā)動機限壽件檢修周期的確定提供依據(jù)。
[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)動機有限責任公司上海商用飛機發(fā)動機工程技術研究中心;上海量維信息科技有限公司;
【基金】:上海市“引進技術消化與吸收”專項資金(12XI-04) 上?莆蒲杏媱濏椖(13DJ1400200)資助
【分類號】:V231.95
本文編號: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.
【作者單位】: 中航商用航空發(fā)動機有限責任公司上海商用飛機發(fā)動機工程技術研究中心;上海量維信息科技有限公司;
【基金】:上海市“引進技術消化與吸收”專項資金(12XI-04) 上?莆蒲杏媱濏椖(13DJ1400200)資助
【分類號】:V231.95
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