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LCF behavior and life modeling of DZ125 under complicated load condition at high temperature

机译:DZ125在高温复杂载荷条件下的LCF行为和寿命建模

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Based on the author and co-worker's systemically experimental investigation on low cycle fatigue (LCF) of directiona lly solidified (DS) Ni-based superalloy DZ125 at 850 and 980℃,LCF behavior analysis and life modeling are carried out here,where the influence of temperature,strain ratio,stress concentration,dwell types and dwell times on fatigue resistance is considered.(1) The steady cyclic stress/strain response is captured based on the transversely isotropic continuum elastic-viscoplasticity model.(2) For the coherent face centered cubic (FCC) structure of DS Ni-based superalloy DZ125,it is physically motivated to consider slip planes as critical plane under fatigue load,the mean stress modified Smith-Watson-Topper (SWTM) parameter Δγmax?(τmax+τm)/2 on the discrete crystallographic slip planes is evaluated.The combination of the theory of critical distance and critical plane method exhibits acceptable predicted LCF life affected by stress concentration.(3) Based on SWTM parameter,Miner's linear cumulative damage theory and Larson-Miller plots,accurate life prediction on smooth LCF with complicated dwell forms is gotten.However,to predict the LCF life affected by dwells and stress concentration,the critical distance concept and the average processed creep stress is introduced,which shows acceptable accuracy of predicted LCF life.
机译:根据作者和同事对定向凝固(DS)镍基高温合金DZ125在850和980℃下的低周疲劳(LCF)进行的系统实验研究,在此进行了LCF行为分析和寿命建模,并在此基础上进行了影响考虑了温度,应变比,应力集中,停留类型和停留时间对疲劳强度的影响。(1)基于横观各向同性连续弹性-粘塑性模型,获取了稳态循环应力/应变响应。(2)对于相干面DS Ni基高温合金DZ125的中心立方(FCC)结构,其物理动机是在疲劳载荷下将滑动面视为临界面,平均应力修正的Smith-Watson-Topper(SWTM)参数Δγmax?(τmax+τm)/在离散晶体滑移面上评估了2。临界距离理论和临界面方法的组合显示了受应力集中影响的可接受的预期LCF寿命。(3)基于SWTM参数,Mi ner的线性累积损伤理论和Larson-Miller图,获得了具有复杂驻留形式的光滑LCF的精确寿命预测。但是,为了预测受到驻留和应力集中影响的LCF寿命,引入了临界距离概念和平均加工蠕变应力,它显示了预期的LCF寿命的可接受的准确性。

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