共查询到17条相似文献,搜索用时 93 毫秒
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地铁作为一种重要的交通工具,在城市生活中起着越来越重要的作用,地铁同时具有绿色无污染、准时、运载能力强等优点. 选用3D高斯+双椭球热源,采用固有应变法,对地铁牵引梁在不同约束情况下的焊接变形进行了模拟. 在模拟现有约束情况的基础上,另外设计了3种约束情况. 结果表明,采用固有应变法的模拟与实测结果吻合较好,x,z向最大变形都出现在方案2中,分别为2.46和13.13 mm,y向变形稳定在1.63 mm左右;将变化率方差最大的角变形作为评价标准,得到方案4最合理,角变形最小为1.21°. 相似文献
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K7转向架副构架是K7转向架的重要组成部分,其结构为三段B+级铸钢焊接而成。若焊后残余应力及变形未达到设计要求会直接影响到机车车辆运行的安全。为了更好地验证现有焊接工艺可靠性,采用ESI公司焊接专用软件SYSWELD对K7转向架副构架进行了数值计算分析。根据K7转向架副构架建立其三维几何模型,划分网格模型,设置热源参数。考虑到实际生产时遇到的情况,采用四种焊接方式进行模拟,并与实验结果相对比,按照设计的焊接工艺仿真得到的焊接残余应力与实验吻合较好,由此验证了仿真的可靠性,可将仿真结果运用于指导生产。 相似文献
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通过运用SYSWELD建立TIG堆焊试件的有限元模型,计算出整个焊接试件的应力场分布和变形情况.模拟结果表明,堆焊试件的应力和变形随能量输入和焊接时间的不同而不同,输入能量越高,焊缝区域应力越小,变形也小;焊接时间增长,应力和变形增大. 相似文献
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Toshio Terasaki Takaharu Fukikawa Takanori Kitamura Tetsuya Akiyama 《Welding International》2013,27(11):830-838
Multilayer welding is considered to be an accumulation of two-pass welding, and it was clarified that the basic factors of welding deformation were produced by two-pass welding. From comparison between the experimental results and numerical analysis, it was found that the numerical analysis method used in this research was very accurate to predict the welding deformation. Also, the influences of the welding heat input and the distance between two-passes on the welding deformation were examined by using the numerical analyses. As a result, it was found that the longitudinal shrinkage made from each pass was decided by the inherent strain distribution parallel to the weld line. The inherent strain distribution parallel to the weld line after two-pass welding was a larger value at one- or two-pass welding. On the other hand, it was revealed that transverse shrinkage made from each pass was decided by the integration of inherent strain distribution perpendicular to the weld line. In the case of the inherent strain distribution perpendicular to the weld line after two-pass welding, it was clarified that the inherent strain was almost same as the sum of inherent strain distribution perpendicular to the weld line made from each pass. 相似文献
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汽轮机本体中 ,蒸汽室的主要作用是通过喷嘴的蒸汽膨胀压力降低 ,蒸汽流速度上升并改变方向 ,将热能转换成动能 ,使高速的汽流沿一定的方向喷向动叶片。喷嘴的工作温度一般在 50 0℃左右 ,由于喷嘴受到高速蒸汽流的冲击 ,因而对喷嘴的高温持久强度和韧性都有较高的要求 ,因此在蒸汽室结构中 ,选用的材料为 2 0CrMo5和X2 2CrMoV12 1,但这两种材料的焊接性较差 ,如焊接工艺选择不当极易产生裂纹。1 喷嘴结构喷嘴结构见图 1,该结构焊接后 ,内环和外环的内外圆直径和两端面只有 0 .5mm~ 1mm的加工余量 ,而且喷嘴叶片没有加工余… 相似文献