Prediction of Welding Distortion and Panel Buckling of Car Carrier Decks using Database Generated by FEA
Prediction of Welding Distortion and Panel Buckling of Car Carrier Decks using Database Generated by FEA
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发表时间：
2007-07
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通讯作者：
Y. Tajima;S. Rashed;Y. Okumoto;Y. Katayama;H. Murakawa
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作者：
Y. Tajima;S. Rashed;Y. Okumoto;Y. Katayama;H. Murakawa
造船过程中焊接变形的矫直是一个费时费力的过程。因此，无论在设计阶段还是施工阶段，都需要最大限度地减少焊接变形。当焊接薄板时，例如用于汽车运输车乘用车甲板上的薄板，焊接纵向收缩由焊接钢丝力引起，在周围的板场中产生压应力，有时会导致这些板场屈曲。弯曲板的矫直是困难的，应尽可能避免屈曲。为此目的，考虑了汽车承运人的汽车甲板的十字加筋板。对采用不同焊接工艺规范的连续焊接和间歇焊接时纵梁和横梁的焊筋力进行了一系列的热弹塑性有限元分析。对双向残余压应力进行了评估，并进行了屈曲校核。结果表明，在焊接截面形状相似的情况下，无论是连续焊接还是间歇焊接，焊筋力几乎仅取决于单位长度熔接线的平均热输入。量化了平行和之字形间歇焊接在降低焊接残余应力和防止屈曲方面的有效性。可以创建筋力数据库，使得设计者可以容易地检查屈曲和选择焊接规范
Straightening of welding deformation in shipbuilding is an expensive and time consuming process. Therefore, minimizing welding deformation is required in both design and construction stages. When welding thin plates such as those used in passenger car decks in Car Carriers, welding longitudinal shrinkage, caused by welding tendon force, causes compressive stress in the surrounding plate fields that sometimes causes these plate fields to buckle. Straightening of a buckled plate is difficult and buckling should be avoided whenever possible. For this purpose, a cross stiffened panel of a car deck of a Car Carrier is considered. A series of thermal elastic plastic finite element analyses is carried out to predict the welding tendon forces of Longitudinals and Transverses when utilizing continuous and intermittent welding with different welding process specifications. Bi-directional residual compressive stresses are evaluated and buckling is checked. Results indicate that when the geometry of the welded cross-section is similar, welding tendon force depends almost only on the average heat input per unit length of the weld line, no matter whether welding is continuous or intermittent. The effectiveness of parallel and zigzag intermittent welding in reducing welding residual stress and preventing buckling is quantified. A tendon force database may be created such that designers may easily check buckling and select welding specifications