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- For the same material, the low cycle fatigue life in high temperature air is longer than that in simulated BWR and PWR primary environments. 对于同种材料,高温空气中的低周疲劳性能优于高温水中的低周疲劳性能;
- High temperature low cycle fatigue (HLF) life prediction models have great significance for design of high temperature structure under cycLic loading. 高温低周疲劳(HLF)寿命预测方法对于承受变幅载荷的高温构件的设计具有重要意义。
- High Cycle Fatigue(HCF) failures of areo engine blades caused by vibration are very important for development and application of engine. 必须最大限度地降低航空发动机叶片高循环疲劳失效。
- A low cycle fatigue (LCF) testing on 16MnL sheet steel is reported. 本文工作对汽车大梁所用的16MnL薄板钢材进行了低周疲劳试验研究。
- Results showed that high stress concentration around the spot weld edge may be the determinable factor for initializing and propagating of the high cycle fatigue crack. 分析结果表明:接头搭接区内表面上焊点边缘处的应力集中是接头高周疲劳裂纹起裂和扩展的决定因素。
- The variance of the mechnical of 45# steel under high cycle fatigue has heen studied.The result shows:Under high cycle fatigue,cyclical softening of 45# steel is a fact. 通过研究45%23钢疲劳循环后材料的力学性能来反映高周疲劳产生的材料软化现象,取得了一些进展。实验结果与假设基本一致。
- The microhardness on the surface of normalized 45 steel smooth sample was measured using micro Vickers under different cycle number during high cycle fatigue. 摘要应用显微硬度计对高周疲劳不同循环周次下正火45钢光滑圆试样进行了表面显微硬度测量。
- Unsteady flow in fan/compressor not only affects its gasdynamic performance, but also reliability, since high cycle fatigue, stall and flutter will cause serious machine damage. 风扇/压气机内的非定常流动不仅影响气动性能,而且影响可靠性,如高周疲劳、失速和颤振等,应加强研究。
- The earthquake spectrums analysis indicated that the failures of building structural steels at seismic areas are created of high stress strain and low cycle fatigue. 地震波谱分析表明,地震区建筑结构用钢受震时的主要失效形式是高应力低周疲劳损伤和断裂。
- Additionally, The SW/B interaction is the main reason of turbine High Cycle Fatigue(HCF). A more deep understanding about SW/B interaction will attenuate the problem of HCF. 此外,激波/叶排干扰是存在该现象的涡轮所受高周交变力的主要原因,要解决这类涡轮的高周疲劳问题(HCF)必须深入研究激波/叶排干扰
- Castability, overload damage and recrystallization are discussed and their effects on stress rupture behavior and high temperature low cycle fatigue fracture are analyzed. 讨论了定向凝固高温合金的过载损伤及其再结晶,较系统地分析了对材料持久性能、高温低循环疲劳断裂的影响。
- Low cycle fatigue properties are affected adverselyby abusive grinding. 过量磨削对低循环疲劳性起着有害的作用。
- The effect of cyclic stress on the strength of creep rupture and recurrent creep rupture as well as low cycle fatigue of a cast nickel-base superalloy with high Al and Ti contents has been studied under different temperature and stress. 本文对一种高铝钛镍基铸造合金,在不同温度分别测定单调持久、周期持久和低周疲劳性能。
- High cycle fatigue fracture of the extension was proved by means of examination of metallurgical quality, heat treatment, fitting clearance as well as macro-and micro-aralysis of the fracture. 通过对断裂叶片的材质、热工艺、装配间隙的复查和断口的宏观、微观分析,证明叶片延伸段的断裂属于高周疲劳断裂;
- The initial requirements involved the belief that the presence of a duplex or "necklace" structure was intolerable from a low cycle fatigue aspect. 最初有人认为从低周疲劳性能的角度来说双层或“项链”组织是绝对不行的。
- Elastoplastic finite element analysis and low cycle fatigue life prediction of an engine combustor case were completed. 对某发动机燃烧室外套进行了弹塑性有限元分析和低循环疲劳寿命预测。
- The results show that low cycle fatigue life is reduced and cyclic stress is raised by torsional prestrain raising. 结果表明,扭转预应变降低低周疲劳寿命,循环应力随扭转预应变的增大而增大。
- Finally, the future directions in the research of multiaxial low cycle fatigue are suggested. 并建议今后多轴低周疲劳课题的研究方向。
- Underfill technology effectively enhances the flip-chip cycle fatigue life and reliability of packaging process. 有机基板上的倒装芯片一般采用底部填充技术以提高其封装的可靠性。
- Recent development of multiaxial low cycle fatigue under nonproportional loading is summarized. 综述近年来国内外非比例载荷下多轴低周疲劳研究的进展和现状。
