Results 1 to 10 of about 40,243 (136)
Jianzhu Gangjiegou Jinzhan, 2022 采用基于断裂力学的有限元法对焊接H形钢梁的疲劳裂纹扩展过程进行了数值模拟。给出了模型的基本假定：初始裂纹为半径1.016 mm的圆形、裂纹中心位于受拉翼缘与腹板之间焊缝焊根处、裂纹前缘由3~4段1/4椭圆弧线控制、在裂纹前缘端点处与内部点处分别采用不同的Paris公式系数、以疲劳裂纹深度穿透受拉翼缘壁厚或SIF超过断裂韧性为循环终止条件。采用二次多项式外推插值的方式对H形钢梁裂纹前缘端点处以及紧邻端点的个别结点处直接输出的应力强度因子（SIF）计算值进行了修正。通过试验验证 ...
肖顺, 童乐为
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Dianci bileiqi, 2020 针对三维裂纹尖端应力强度因子计算困难的现状,提出了一种新型的三维裂纹应力强度因子计算方法,通过与其它方法在计算含圆孔平板裂纹尖端应力强度因子的对比分析,验证了本文应力强度因子计算方法的有效性和优越性。建立含裂纹缺陷的高压断路器瓷套有限元数值模型,将本文方法应用于高压断路器瓷套裂纹的应力强度因子计算,研究了高压断路器瓷套表面裂纹应力强度因子与瓷套所处环境温度、裂纹分布位置和裂纹尺寸的变化关系,获得了易导致瓷套断裂的环境、裂纹分布位置和裂纹尺寸,为电力行业中断路器瓷套的设计及运行维护提供有效的技术指导和借鉴。
赵滨滨, 王莹, 徐晓萌, 崔文婷
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Laser‐directed energy deposition (L‐DED) offers a flexible route for fabricating γ‐TiAl components, but the as‐deposited microstructure requires post‐processing to overcome limited deformation capability. Here, an L‐DED Ti–48Al–2Cr–2Nb alloy was subjected to solution and solution‐aging treatments.
Mengya Chu +6 more
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Bimetallic structures fabricated by laser powder bed fusion (LPBF) provide an effective strategy for achieving multifunctional integration, yet interfacial structural continuity and the role of lattice defects remain insufficiently understood.
Jinguo Ge, Shuo Yin
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Ultrathin sodium (Na) metal anodes (< 40 μm) with superior electrochemical performance are essential in developing high‐energy‐density sodium metal batteries (SMBs). Nonetheless, Metallic Na's poor processability hinders its practical application.
Hao Yao +6 more
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Unveiling Entropy‐Driven Hard‐Tough Synergy Mechanisms in High‐Entropy Carbonitride Ceramics
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT High‐entropy ceramics manifested promise for extreme environments, yet their phase stability and mechanical synergy mechanisms remain elusive. Herein, entropy‐difference carbonitrides, including (TaTiV)CN, (TaTiVNb)CN, and (TaTiVNbHf)CN, were designed and consolidated via spark plasma sintering.
Long Zhao +6 more
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT The limited crack resistance of coarse grain boundaries and coarse interfaces leads to an incompatibility between high‐temperature strength and ductility in TiAl alloys. Tailoring stress‐oriented textures and multiscale heterogeneous interfaces can effectively impede crack propagation, thereby overcoming this trade‐off.
Kexuan Li +7 more
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Shiyou jixie, 2012 为了了解内压作用下含裂纹射孔套管临界开裂应力，为现场确定泵压等施工参数提供参考依据，用ANSYS有限元分析软件建立了射孔套管有限元模型，给出了含孔边裂纹射孔套管应力强度因子计算公式，对内压作用下含裂纹射孔套管临界开裂应力进行分析计算，得到了临界开裂应力与纵向裂纹长度的关系曲线。研究结果表明,套管最大应力集中在孔边裂纹处，在内压产生的应力作用下裂纹有可能沿轴向产生脆性扩展，因此，孔边裂纹大大削弱了射孔套管的强度；射孔套管临界开裂应力随裂纹长度的增加而减小；在短裂纹区（10 mm＜a＜20 mm ...
许爱荣, 邹云, 杨向同, 窦益华
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Flexible, Robust Transparent Conductive Films With Excellent Electromagnetic Shielding Properties
Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Transparent conductive films (TCFs) are indispensable components for next‐generation wearable electronics, intelligent robots, and electromagnetic interference (EMI) shielding devices. However, the fabrication of conventional random metallic mesh suffers from an inherent trade‐off between “randomness and controllability”.
Shanghao Lu +5 more
wiley +1 more source
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
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