Results 31 to 40 of about 512 (141)
Gaoya dianqi, 2022 为了深入地研究复合绝缘子的酥朽断裂，获得其与脆断的异同，文中对现场酥断故障复合绝缘子进行了外观形貌检查、扫描电镜分析、傅里叶光谱分析以及X射线扫描分析，并且将结果与脆断绝缘子进行了相应地对比分析。分析表明：酥朽绝缘子断口颜色不再正常，芯棒变软劣化，脆断端口颜色正常；与脆断相比，酥朽样品的电镜结果出现了树脂的气泡现象，纤维丝裸露更严重；元素分析表明，两者都受到了硝酸入侵，都出现了芯棒的水解，但酥朽时更严重。基于实验结果，对两者的断裂机理进行了总结分析，得出放电与酸是造成这类故障的共同因素。
卢明 +5 more
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, 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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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Nb‐Si‐based superalloys are considered as the most potential candidate materials for nickel‐based superalloys due to the lower density and higher using temperature. Here, a type of stable Nbss/γNb5Si3 bi‐phases structure with a coherent interface has been successfully designed. Additionally, the Nbss and γNb5Si3 phases showcase the orientation
Xiao‐Wei Wang +6 more
wiley +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Internal oxidation has been identified as an effective method for enhancing the strength of AgMg alloys. However, the concurrent occurrence of embrittlement remains inadequately understood, thus limiting their broader application. This study investigates the oxidation behavior of AgMg alloys with Mg concentrations ranging from 1 at% to 7 at ...
Hai‐Cheng Zhu +12 more
wiley +1 more source
Preparation and Characterization of BN Coating on SiC Fibers by Carbothermal Reduction [PDF]
, 2016 本论文以硼酸三甲酯（trimethylborate—TMB）蒸气为硼源、NH3气为氮源，采用碳热还原氮化法在SiC纤维表面制备BN涂层。首先，SiC纤维与Cl2气反应表面生成碳化物衍生碳（carbide-derivedcarbon—CDC）层，然后，CDC层与TMB蒸气及NH3气在1300C发生碳热还原氮化反应，生成BN涂层。采用FT-IR、XPS、XRD、AES、SEM、TEM、电阻率测试、单丝拉伸试验等系统地研究了所得BN涂层的组成、结构和性能。研究发现 ...
袁梦娇
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Experimental and theoretical analyses of three-dimensional surface crack propagation [PDF]
, 2017 2011-2012 > Academic research: refereed > Publication in refereed journalVersion of ...
Han, ZC +4 more
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Research on Key Issues in Eddy Current Nondestructive Evaluation of Residual Stress in Aluminum Alloy [PDF]
, 2015 铝合金作为制造业发展的基础材料，在航空航天、高速铁路、建筑工程、船舶制造、汽车工业等支柱产业中有着重要地位。残余应力往往是造成铝合金结构破坏的重要因素。有效的评价应力状态，特别是导致损伤出现的临界应力状态是评价设备结构强度、可靠性的重要依据。传统的无损检测方法已广泛应用于工程实际中，但大部分局限于对已成型的缺陷进行检测。对于可能导致损伤出现的隐性、不规律变化的残余应力状态的评价则较为困难。 目前，应用较多的残余应力检测法主要有盲孔法、X射线法、超声波法以及磁测法。这些方法在使用上都存在很大的局限性 ...
汪涛
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Effect Mechanism of Curling Temperature on the Toughness of Titanium Microalloyed High-strength Steel GCL700 [PDF]
The effect of curling temperature on the mechanical properties of Ti microalloyed high-strength steels was investigated using electron backscatter diffraction， transmission electron microscopy， scanning electron microscopy and mechanical experiments.The ...
Wang Yi, Che Zhichao, Chen Yufeng, Yang Shufeng, Zhang Junfen, Xue Qihe, Li Jingshe
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Microstructure and impact toughness of hot rolled and tempered low carbon bainitic steel AH80DB [PDF]
, 2016 The microstructure,martensite/austenite(M/A) islands,precipitated phases,high-angle grain boundaries and effective grain size of hot rolled and tempered low carbon bainitic steel AH80 DB were studied by scanning electron microscopy(SEM),transmission ...
DING Yi +6 more
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Jianzhu Gangjiegou Jinzhan, 2013 以翼缘板加强式和盖板加强式两类加强型节点为研究对象,采用ANSYS结构分析软件"生死单元"功能模拟了瞬态焊接过程,得到焊接残余应力场的分布,在此基础上,针对有、无考虑焊接残余应力的两种有限元模型,分析了残余应力对节点和荷载-位移滞回性能及脆性断裂特性等影响。研究结果表明,焊接残余应力对盖板加强型节点的脆性断裂影响大于翼缘板加强型节点,盖板加强式节点在梁端对接焊缝的边缘容易发生脆性断裂,在设计和施工时应予以注意并采取相应的防范措施。
刘芸, 王燕, 王薇
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