Gaoya dianqi, 2013 零件疲劳分析与计算对高压开关设备寿命预测起着至关重要的作用。笔者分析了高压开关传动系统关键零件疲劳的特点;建立了零件疲劳极限应力图模型,采用该模型可以计算出零件的疲劳极限与疲劳安全系数,并且可以估算在考虑安全系数前提下零件的疲劳寿命;以某高压断路器传动连杆的疲劳计算为例,对所采用的方法进行了验证。得出了3点结论:①有必要对高压开关零件进行疲劳分析和计算;②借助零件疲劳极限应力图可以较好地进行零件疲劳强度计算;③应力集中和零件材质对疲劳极限和寿命有较大的影响。
程立 +4 more
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Strength Calculation of Harmonic Gear Reducer in Assembly and Dynamic Operation Process [PDF]
, 2017 自从C.W.Musser发明了谐波齿轮减速器并运用到火箭上后，由于它的传动比大、重量轻、可靠度强、体积小、传动精度高等优点而倍受关注。我国从两弹一星开始，在大力发展航天事业的背景下，谐波齿轮减速器被广泛地运用到火箭及卫星的传动机构中。但国内对于谐波齿轮减速器的失效机理和结构优化及多样化等方面还需深入研究，尤其缺乏对其动态运转强度较为精确的计算和对其疲劳寿命的评估。 针对上述问题，本文研究谐波齿轮减速器的强度与失效机理，给出了一种基于应力-寿命法的疲劳预测过程，并对谐波减速器的结构进行了改进 ...
杨健
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Development of a power recovery-based dynamic loading system for full-size drill rods in coal mines [PDF]
ObjectiveThis study aims to simulate the actual forces applied to drill rods during the borehole drilling for gas drainage from underground coal mines to satisfy the requirements of drill rods’ fatigue tests.
Jie WANG, Jing ZHANG
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Anti-earthquake Analysis of Nuclear-class UPS Based on HyperWorks [PDF]
, 2016 核级UPS是核电站的重要设备之一,对核电厂的安全稳定运行起重要作用。为保证设备质量和可靠性,核级UPS需要进行抗震强度分析确保其通过抗震试验鉴定,使其满足当电厂实际发生地震的烈度在鉴定试验抗震响应谱的包络范围内设备能够安全运行。使用HyperWorks软件对核级UPS进行结构抗震强度分析,以确保其结构设计满足核级设备的抗震要求。The nuclear-class( 1E class) UPS,as the significant power supply in nuclear power plant ...
付明星, 孟超, 李静, 许本福
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Analysis and experimental study on the vibration characteristics of the spiral drum of a shearer based on two-way coupling method [PDF]
In order to study the vibration characteristics of shearer’s spiral drum under various occurrence conditions，the coal-rock contact model was optimized by taking the MG2×55/250–BWD thin seam shearer as the engineering object, and discrete element model of
Lijuan ZHAO +3 more
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Gaoya dianqi, 2010 断路器在频繁操作的情况下,其绝缘拉杆有可能因为疲劳破坏而发生断裂。为了确保断路器在整个寿命期内绝缘拉杆不会因为疲劳而断裂或将其控制在某一范围内,可以在断路器绝缘拉杆设计完成后,通过测定绝缘拉杆的运行载荷,然后进行疲劳试验得到绝缘拉杆在预期寿命时的受力状况,最后再对试验数据进行统计分析,以得到绝缘拉杆在寿命期内的可靠度系数,并确认其是否满足设计要求,如果必要,也可以根据试验中的薄弱点进行针对性改良。
党向东
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FATIGUE CRACK GROWTH BEHAVIOR of 0Cr18Ni9 STAINLESS STEEL AT HIGH TEMPERATURES [PDF]
, 2012 研究奥氏体不锈钢0Cr18nI9在高温(550℃)下的疲劳裂纹扩展规律。测试采用标准CT(COMPACT TEnSIOn)试样,最大载荷范围为6.5 kn~14 kn,应力比为0.1(室温)和0.05(550℃)。裂纹扩展过程通过QuESTAr长焦距显微镜直接观测,同时采用COd(CrACk OPEnIng dISPlACEMEnT)规记录加载线位移。由于在高温条件下,测试终止时试样的裂纹前缘呈明显弧形,故此给出实测表面处裂纹长度有效值的修正方法。对高温疲劳裂纹扩展问题 ...
刘建中, 胡本润, 陈勃, 陈立杰
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Uncertainty analysis of notch stress concentration factors for welded butt joints [PDF]
ObjectivesThis paper focuses on parametric modeling of a typical butt joint and establishes a finite element model with uncertain geometry of the weld seam, aiming to investigate the stress concentration factor Kt at the weld toe of the butt joint with ...
Chunbo ZHEN +4 more
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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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The Bending Strength of Steel 25Cr2MoV for Plasma Nitrided Gears
Jixie chuandong, 1994 作者对２５Ｃｒ２ＭｏＶ离子渗氮齿轮轮齿进行脉动弯曲疲劳试验，并在考虑样本置信度的前提下，拟合出齿轮弯曲疲劳的Ｒ—Ｓ—Ｎ曲线，提高了结果的可信度与准确度，为这种齿轮的可靠度设计和寿命预测提供了基本数据。作者还对两种不同厚度渗氮层的齿轮作了比较。
谈嘉祯, 徐寿文
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