Results 51 to 60 of about 318 (134)
[Effects of surface treatment on the phase and fracture strength of yttria- and magnesia-stabilized zirconia implants]. [PDF]
Beijing Da Xue Xue Bao Yi Xue Ban, 2023 Ding Q +5 more
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, 2004 通过对铁电陶瓷疲劳失效研究现状的文献综述,概述了国内外在电疲劳和电致疲劳的机理、影响因素和实验手段等方面的研究进展。通过分别对各类电疲劳机理和各种电致疲劳模型进行讨论,比较了各种理论和模型之间的不同之处 ...
张颖, 程璇, 陈志武
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Investigation of the internal failure mechanism of laser-additively manufactured nickel-based superalloy [PDF]
Nickel-based superalloys exhibit excellent high strength and thermal fatigue resistance at 650 ℃, making them widely used for manufacturing elevated-temperature components such as turbine blades for aero-engines.
Chuanwen SUN, Rui SUN, Wei LI
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Guangtongxin yanjiu, 1993 <正> 提高光纤强度的方法都是消除光纤表面的微裂纹。而提高光纤强度既是系统工程,又是环境工程,贯穿在光纤制作的各个环节。微纹刻蚀技术、TiO2涂覆等方法用作消除表面微裂纹是有效的,而钝化工艺及密封涂覆既可消去光纤表面微裂纹,亦可解决光纤“疲劳”问题。碳涂覆较金属涂覆、陶瓷材料涂覆理想,因为碳的低扩散系数允许使用较薄的涂覆防止氢和水的渗透,碳的低弹性模量使碳涂覆光纤在破断之前就能经受很高的应力,并且碳涂覆的拉丝速度可达600m/min。
郑先华, 刘有信
doaj
Study on the Effects of Partial Pressure on X52M Pipeline Hydrogen Embrittlement Properties in High-Pressure Hydrogen Environments [PDF]
In pure hydrogen pipeline systems， the transmission pressure is critical for ensuring both efficient operation and safety performance. Through the slow tensile and fatigue life tests under high pressure gas phase environment， the influence law of ...
Zhao Qian, Liu Haixiao, Li Ming, Wang Bing, Li Ba, Jia Shujun, Liu Qingyou
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[Numerical simulation study of fracture mechanics of the atherosclerotic plaque]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi, 2021 He J, Zhong W.
europepmc +1 more source
, 2004 将BP神经网络和遗传算法相结合 ,得到了一种可计算腐蚀管道剩余强度和最大允许注水压力的新神经网络。通过实例分析 ,将 7种常用规范和改进的遗传神经网络方法进行了比较。结果表明 ,不同计算方法得到的剩余强度和最大允许注水压力相差较大 ,Wes 2 80 5 - 97规范、ASMEB31G规范、CVDA— 84规范、Irwin断裂力学方法等都比J积分方法的剩余强度和最大允许注水压力偏大 ;Burdiken和DM断裂力学方法计算得到的剩余强度和最大允许注水压力比J积分偏小 ...
付道明 +4 more
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Corrosion-damage behavior of 38CrMoAlA steel under alternating hot-humid/salt-fog conditions and its effect on mechanical properties for aircraft–engine applications [PDF]
38CrMoAlA steel is widely used in critical components, such as blower drive shafts of aircraft engines, because of its remarkable mechanical properties and surface hardening potential.
Fubing LIU +5 more
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Gaoya dianqi, 1993 波纹管是决定真空灭弧室机械寿命的重要元件。日本在这方面有独到研究,Hamada等人曾写过一篇关于波纹管静止负荷（轴向应力、内压力等）下应力计算的文章,但论文未介绍当受到连续负荷影响时的波纹管的寿命情况。目前,长寿命波纹管的设计是建立在以波纹管的疲劳断裂试验结论为基础上的。 波纹管的寿命取决于波纹管上每个波的伸张度。增加波数是增加波纹管寿命和发展长行程波纹管的一种有效方法,但增加波数会带来以下两个问题。
马铜德
doaj
Shiyou jixie, 2012 针对应力集中导致石油钻杆螺纹产生疲劳裂纹，进而发生断裂失效的事故，在API接头的基础上，研究开发了一种新型钻杆螺纹接头，该新型螺纹结构主要改进之处是内螺纹锥度保持1:6不变，外螺纹锥度变为1:6.23。有限元分析结果表明，这种螺纹形式显著改善了接头上的受力分布情况，使得螺纹上应力分布更加均匀，并降低了主台肩过渡圆角处的应力集中。对样品的上扣试验结果表明，采用新型螺纹后，外螺纹接头主台肩底部的过渡圆角处应力集中情况也得到明显改善，接头整体受力分布和不同区域应力差更趋平缓 ...
焦文鸿, 高连新, 鲁喜宁
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