Results 21 to 30 of about 2,090,567 (184)
, 1992 从Reissner壳体理论出发,将“局部-整体分析法”应用于圆柱壳孔边裂纹问题,比较精确地计算了圆柱壳孔边轴向裂纹和环向裂纹的应力强度因子,获得了应力强度因子随壳体几何尺寸、开孔大小及剪切刚度变化的规律。以作者在文[7,8]中的有限元分析结果为基础,推广Petroski-Achenbach方法,建立圆柱壳孔边裂纹问题的权函数,分析计算了圆柱壳孔边裂纹问题,获得了较好的结果 ...
胡互让, 吴犀甲, 柳春图
core
Shiyou jixie, 2014 为了弄清埋地输气管道在地震载荷作用下的动态失效过程，首先对X80管线钢进行了力学性能测试，获得了弹塑性材料线性强化的本构模型参数。然后基于非线性动力学理论、有限元算法和ANSYS有限元商业软件，建立了土埋地输气管道在动力接触条件下的相互作用模型。载荷采用加速度时程的方法输入天津波，震级为7级，获得了不同壁厚条件下输气管道的动态应力应变响应和带缺陷管道的动态应力强度因子的时程曲线。由X80管线钢的临界应力强度因子，得出了管道极限承载条件下壁厚的下限值以及施加的加速度最大值 ...
赵新威 +4 more
doaj
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Rechargeable aluminium‐ion batteries (RAIBs) are promising candidates for sustainable energy storage owing to their low cost, safety, and resource abundance. However, the lack of durable cathode materials restricts their development. Here, we propose a topology‐guided design strategy by synthesizing three thioether‐bridged naphthoquinone ...
Jia Qiao +8 more
wiley +1 more source
Q355B钢对接接头气孔缺陷对疲劳寿命影响的试验研究与数值模拟
Jianzhu Gangjiegou Jinzhan焊接过程常伴随着气孔、夹渣、咬边等缺陷的产生，这些缺陷在疲劳荷载作用下容易导致疲劳裂纹的产生和扩展。基于有限元分析软件ABAQUS结合断裂力学分析软件FRANC3D，本文建立了含气孔缺陷的对接接头有限元模型，并在应力集中最大值处植入裂纹，依据断裂力学M积分对含裂纹的模型进行数值模拟，得到了不同初始裂纹长度和焊缝宽度下裂纹尖端的应力强度因子。分析结果显示：裂纹尖端的应力强度因子对初始裂纹长度变化敏感，随初始裂纹长度增加而增加，而裂纹两端的应力强度因子则呈相反趋势；增加焊缝宽度可以显著降低应力强度因子 ...
熊海江 +4 more
doaj +2 more sources
Dianci bileiqi, 2016 针对瓷绝缘子等复杂几何模型中三维裂纹建模困难的现状,提出了一种新型的三维裂纹实体数值建模法,通过平板半椭圆形表面裂纹应力强度因子的数值解和理论解的对比分析,验证了提出的裂纹实体建模法的有效性。基于有限元理论,建立了支柱瓷绝缘子的数值仿真模型,计算了瓷绝缘子在无缺陷状态下的应力分布情况,应用本文的裂纹建模法建立了瓷绝缘子的表面裂纹,分析了瓷绝缘子表面裂纹应力强度因子随裂纹尺寸以及裂纹所在位置的变化规律,获得了易导致断裂的危险裂纹尺寸和裂纹危险分布区域,为电力系统中瓷绝缘子的运行维护提供理论指导和技术支持。
董云云 +4 more
doaj
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT The residue of mesotrione poses an increasingly serious threat to the environment and human health. Thus, it is essential to establish a platform that integrates rapid detection and efficient degradation. Covalent organic frameworks (COFs) materials have garnered significant attention owing to their designability.
Yong Xie +3 more
wiley +1 more source
Gaoya dianqi, 2018 文中描述了252 kV三相盆式绝缘子破坏水压试验的情况,为明确三相盆式绝缘子破坏水压不能满足标准要求的原因,首先对252 kV三相盆式绝缘子进行了建模、仿真与分析,明确了三相盆式绝缘子相间盆式结构交汇处应力集中是破坏水压偏低的原因。随后对模型进行了改进,将应力集中由‘Y’型分布转化为‘△’型分布,显著降低了最大应力值,显著改善了盆式绝缘子的耐压状态。最后讨论给出了252 kV三相盆式绝缘子在强度设计过程中应结合仿真计算进行机械强度设计的基本思想。文中的工作为三相盆式绝缘子的设计提供了一定的参考。
武胜斌 +5 more
doaj
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT In recent years, materials capable of achieving efficient electromagnetic wave (EMW) absorption over a broad frequency range have attracted widespread attention. Such materials are not only significant in mitigating electromagnetic interference and pollution caused by the extensive use of electronic devices but also demonstrate outstanding ...
Maoxia Lu +7 more
wiley +1 more source
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Water pollution is becoming increasingly severe, posing a serious hazard to human health and ecological security. Therefore, it is necessary to develop rapid, sensitive, and universal analytical methods to detect residual pollutants in actual water.
Yi Xing +4 more
wiley +1 more source
Aspect Ratio‐Controlled Chiral Nanostructures for Dual‐Mode Breast Cancer Theranostics
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Chiral CdSe/CdS quantum dots (QDs) have emerged as promising platforms for precise cancer diagnosis and therapy due to their unique optical properties and biological interactions. In this study, we systematically investigated the role of aspect ratio (AR) modulation in ultrathin‐shelled chiral CdSe/CdS dot‐in‐rods (DRs) on their performance in
Linxuan Wu +9 more
wiley +1 more source