共查询到19条相似文献,搜索用时 55 毫秒
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纯钛在海洋环境中具有优良的耐蚀性和耐生物附着性。用于凝汽器的海水冷却管在船舶上使用涉及到纯钛焊接板骨架构件的船舶结构材料时,其焊接残余应力对疲劳强度、压曲强度的评价很重要。即在疲劳行为上,拉伸的残余应力呈现出使平均应力增大的相同效果,从而使测得的疲劳强度偏低。对角焊焊接的板骨结构,焊接部位存在着残余应力,与之平衡在所围骨架的板中央附近产生了压缩残余应力,这种残余应力使压曲负载下降。但对纯钛的焊接接头残余应力缺乏研究,因此,日本学者为了评价纯钛焊接构件的疲劳、压曲强度,对纯钛的焊接接头残余应力进行… 相似文献
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运用三维热塑性有限元法对不同预置应力下搭接接头角焊缝的焊接残余应力的影响进行了分析,提出了通过预置应力来降低焊缝根部的焊接残余应力峰值,从而提高结构的使用寿命的方法。 相似文献
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焊接工艺参数对焊接残余应力的影响 总被引:1,自引:0,他引:1
选取20G作为实验材料,采用埋弧自动焊焊接成试板,分别考察了焊接电流和焊接速度这两个焊接工艺参数对其焊接残余应力数值大小的影响。结果表明,焊接电流一定时,焊接残余拉应力随焊接速度增大而增大;焊接速度一定时,焊接电流越大,焊接残余拉应力越大。 相似文献
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Methods of measurement of residual stresses in cast amorphous microwires are submitted. The obtained experimental results confirm the earlier given theoretical conclusions. 相似文献
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焊接残余应力和变形之间存在着确定关系,二者可通过焊接过程中产生的非协调应变联系起来,文中以焊接初应变为基础,利用边界元的直接法,推导出了通过焊接变形求解二维焊接残余应力的数学模型.给定焊缝中初应变的初值,根据焊接构件边界上已知的位移信息,可由边界积分方程求出边界上所有未知的位移分量和表面力分量.在边界位移已知的条件下,应用该模型可对焊接构件内部残余应力进行求解.构件边界上的应力可由弹性体的边界应力和边界面力的关系,通过物理方程和几何方程求出.通过计算实例,验证了模型的可行性. 相似文献
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Hessamoddin Moshayedi Iradj Sattari-Far 《Journal of Materials Processing Technology》2014,214(11):2545-2552
A 2-D finite element model is developed based on fully coupled electrical-thermal and incrementally coupled thermal-mechanical analysis. The growth rate of the weld nugget as a function of welding time and current is studied. Comparison of the predicted results with the experimental data shows good agreement. Contact area variations and pressure distribution between the sheets’ faying surface and electrode-sheet interfaces during the welding process are studied. Compressive radial residual stress on the surface of the specimen obtained in the center region of the nugget while it becomes tensile and rises toward the nugget edge. The maximum tensile residual stress occurs outside of the nugget, near the edge region. The effects of welding time and current on distribution and magnitude of welding residual stresses are also investigated. The magnitudes of radial residual stresses in the inner and outer areas of the weld nugget grow with increasing the welding time and current while they decrease slightly in the edge regions of the weld nugget. The growth rate of the maximum residual stress reduces with increase in the welding time and current. This fact is more tangible for welding time. 相似文献
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