Results 1 to 10 of about 269 (95)
Testing load transacting method based on assessment target equivalent [PDF]
, 2023 摘要：在全尺寸结构强度试验中，需将原始理论载荷转化为试验实施载荷，载荷处理的结果直接关乎着试验考核的真实性和有效性。传统的载荷处理方法基于载荷等效，载荷处理完成后再对比数值分析结果，这种开环的载荷处理方法遇到复杂结构和载荷时通常效率和精度都大打折扣。提出了一种基于考核目标等效的试验载荷处理方法，将数值仿真分析结合到载荷处理过程中，搭建一种载荷优化设计-试验态分析-考核目标评估的闭环架构，以结构目标响应为评估判据和优化目标，结合灵敏度分析、遗传算法等智能优化算法，搜索试验态载荷最优解 ...
Liu, W, Wang, B, Wang, G, Zheng, J
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Brief Analysis of the Development of Mechanical Research and Trends of Grouted Connection of Offshore Wind Turbine [PDF]
, 2023 [Introduction] The connection between offshore wind turbine foundation and superstructure is usually made by grouting. It is crucial to ensure the safety of the grouted connections, and the study of grouted connections is always a key and difficult point.
Kan LIAO, Ke CHEN, Li ZHANG
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Effects of Loading Sequence on Fatigue Damage Accumulation of Asphalt Mixture
, 2023 The accumulation process of fatigue damage of asphalt mixture under variable amplitude loading exhibits an obvious nonlinear characteristic. However,the traditional linear damage accumulation criterion fails to characterize the nonlinear fatigue damage ...
Fang, C +6 more
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, 2023 特高压变压器发生内部故障时如压力不能及时泄放，极易造成油箱变形甚至爆裂，进而导致燃爆事件。分析了变压器常用的防爆保护装置及其优缺点，提出了一种基于爆破片的新型压力泄放装置，并通过真型燃爆试验和动态等效试验对爆破片型压力泄放装置的有效性进行了验证。试验结果表明：在变压器内部高燃爆能量电弧故障下，爆破片型压力泄放装置动作速度和泄放效率均优于压力释放阀 ...
卢理成, 董弘川
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Indentation effect on the fatigue limit of axle steel [PDF]
, 2016 A hardness tester was used to make indentations on the hourglass fatigue specimens of axle steel,and notches were machined by electronic discharge machining(EDM).The fatigue limits of both indentation specimens and notched ones were examined and compared
DAI Guang-ze +4 more
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Jixie chuandong, 2022 当前，表面硬化齿轮存在多种铸锭工艺状态，开展铸锭工艺对齿轮弯曲疲劳性能影响的研究，对齿轮抗疲劳精益设计和成本控制有十分重要的意义。对模铸锭、连铸坯和电渣锭18CrNiMo7-6渗碳齿轮开展了表面完整性表征测试，研究了不同铸锭状态齿轮的齿根残余应力、表面粗糙度和硬度差异；基于齿轮弯曲疲劳试验国家标准GB/T 14230—2021，设计了齿轮弯曲疲劳试验方案，对模铸锭、连铸坯和电渣锭18CrNiMo7-6齿轮开展了升降法齿轮弯曲疲劳试验，获取了不同可靠度下的弯曲疲劳极限 ...
武忠睿 +4 more
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Aprediction model for the very high cycle fatigue life for inclusion-FGA (fine granular area) -fisheye induced fatigue failure [PDF]
, 2017 A prediction model for the very high cycle fatigue life for inclusion-fine granular area (FGA) -fisheye-induced failure was studied in this work. Combined with the experimental results of Cr-Ni-W alloy steel, a local crack initiation life model (LCIL ...
DENG Hai-long +3 more
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Effects of cooling velocity on multiaxial fatigue behavior of A319 alloy under circular loading conditions [PDF]
, 2017 The effects of cooling velocity on the multiaxial fatigue properties of A319 alloy under circular loading conditions was studied by using the MTS809 servo-hydraulic testing system and scanning electron microscopy.
DAI Li-quan +5 more
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Dianci bileiqi, 2021 空心复合绝缘子是高压电器的重要外绝缘部件,同时承受机电热等多种应力。空心复合绝缘子的长期疲劳性能对配套主机设备安全运行意义重大,但相关研究很少。以500 kV典型规格的空心复合绝缘子为试验对象,分别进行了2组有无1 000次弯曲疲劳对比试验,研究了不同弯曲负荷下的端部连接结构破坏形式。试验数据表明,两组试验的最终弯曲破坏平均值非常接近,经历1 000次弯曲疲劳试验的端部连接结构更容易以拔脱形式破坏失效。不同的破坏趋势表明疲劳试验对连接区产生了影响,这种现象应当在生产实践中引起足够的重视 ...
韦晓星 +4 more
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Jianzhu Gangjiegou Jinzhan, 2022 针对钢桥中钢板疲劳裂纹进行了一系列疲劳裂纹修复试验研究，以确定不同修复方法下结构的疲劳性能。高弹模CFRP（碳纤维增强复合材料）修复法是通过粘贴高弹模CFRP布来增大结构刚度，以延长结构疲劳寿命，且碳纤维材料基本不会产生疲劳裂纹，具有较好的抗疲劳效果。采用数值模拟和试验研究相结合的方法，首先对修复钢板的应力分布和特点进行了详细的分析，然后通过3组对比疲劳试验，确定了不同修复方法对损伤钢板疲劳寿命的增强效果。最后利用修复试验值与各国规范规定的S-N曲线进行比较，分析已修复钢板的疲劳性能。研究结果表明 ...
吕志林 +4 more
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