Plate forming is an essential procedure in shipbuilding, which will influence the dimensional accuracy and fabrication schedule. Due to the advantages of induction heating for plate forming such as precision controlling, high level of automation, an experimental investigation for plate forming with multiple linear induction heating was carried out at first. With advanced 25 kW induction heating equipment and additional water cooling system, thermal cycles of several examined points during plate forming with induction heating was measured, and the influence of moving speed of induction heating coil on highest temperature of examined points was also investigated. Applying different heating pattern, plate with 6 mm in thickness will buckle as saddle shape due to the multiple-line heating in longitudinal direction and its generated large enough compressive force. Moreover, thermal elastic plastic (TEP) FE and elastic FE computational approaches were proposed and employed. Predicted out-of-plane bending deformations both have good agreement with measurement. Elastic FE computation with bending moment caused by induction heating as input load has effective advantage and high accuracy comparing to conventional thermal elastic plastic FE computation.

中文翻译：

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多线感应加热弯板初探

板材成型是造船中必不可少的工序，它会影响尺寸精度和制造进度。由于感应加热板材成型具有控制精度高、自动化程度高等优点，首先进行了多线感应加热板材成型的实验研究。借助先进的25kW感应加热设备和附加水冷系统，测量了感应加热板材成形过程中多个检测点的热循环，并研究了感应加热线圈移动速度对检测点最高温度的影响。应用不同的加热方式，6mm厚的板材由于纵向多线加热，产生足够大的压缩力，会弯曲成马鞍状。此外，还提出并采用了热弹塑性 (TEP) FE 和弹性 FE 计算方法。预测的平面外弯曲变形都与测量结果非常吻合。与传统的热弹塑性有限元计算相比，以感应加热引起的弯矩为输入载荷的弹性有限元计算具有有效的优势和高精度。