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低周被劳寿命可由塑性应变能表达。LCF life could be well expressed by plastic strain energy.

使用未经本公司认可的部件引起损坏。The damage caused by using parts without the approval of LCF.

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未经本公司书面批准，更改机械上装置与设定。Replace the mechanical devices and settings without the written approval of LCF.

设计了涡轮盘低循环疲劳试验件，在旋转试验器上进行了涡轮盘的高温低循环疲劳试验。An experimental turbine disk was designed, and the high temperature LCF test of the rotor was carried out on the spin test rig.

指出了目前激光熔覆成形有限元模拟中存在的问题，并在此基础上提出了激光熔覆成形有限元模拟的发展方向。The existing problems in LCF finite element simulation were pointed out, and its future research direction also was put forward based on these.

结果表明，DZ4合金760℃和800℃下的低周疲劳属应力疲劳，其损伤以弹性损伤为主，弹性损伤与疲劳寿命具有很好的相关性。The results show that the LCF of DZ4 superalloy at 760℃ and 800℃ can be contribute to stress fatigue owing to the main elastic damage in LCF processing.

在确定性寿命计算的基础上，考虑参数的随机性，进一步对涡轮盘低循环疲劳寿命进行可靠性研究。Furthermore, considering the discrepancies in the design variables, reliability research was done for the LCF life on the basis of deterministic life calculations.

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最后采用所提方法计算分析某涡轮盘销钉孔边低周疲劳概率寿命，寿命数值计算结果与试验结果吻合良好。At last, the LCF probabilistic life at pin-hole of some turbine disk was analyzed, using the method given. Numerical results of life fit well with the experimental ones.

联合处理方法的应用将不再需要进行应变控制的长寿命小应变的疲劳试验，节约了试验经费，缩短了试验周期。This new method of combining LCF with HCF allows to avoid long fatigue life with small strain test under strain controlled, thus test expenses may be saved and test time shortened.

对在低循环疲劳试验过程中破裂的某型机低压涡轮盘组件的残骸进行了材质和断口分析。The materials and fracture surfaces of a low pressure turbine disk assembly that was broken during LCF testing were examined. The fracture of the LP turbine disk was resulted from low cycle fatigue.

非比例载荷下钛合金BT9中的局部高密度位错是其低周疲劳损伤程度加剧及寿命降低的主要因素。The high dislocation density in some local areas of the dislocation sub-structures is the major factor which is responsible for the severe LCF damage and fatigue life reduction of Titanium alloy BT9.