压印接头强度的有限元模型及理论计算方法

Simulation and calculation methods for clinched joint strength

建立了压印接头拉剪强度模型并提出接头强度的理论计算方法。建立了压印连接成形的二维模型,模拟压印成型过程并分析金属流动规律,模拟结果与试验结果一致。由压印连接过程的模拟结果得到压印接头的三维模型,由此三维模型模拟接头的拉剪过程,得到接头的载荷-位移曲线和失效形式,模拟结果与试验结果一致,求解误差为3.4%。根据压印接头拉剪的两种失效形式(颈部断裂失效和上下板分离失效),提出了压印接头的理论计算公式。并由12种压印接头对计算公式进行验证,求解结果与试验结果吻合,最大强度误差为8.9%。

A finite element （FE） model and a theoretical calculation method for the tensile-shear strength of clinched joint were proposed. First, a 2D model for clinching process was established in ANSYS to simulate the performing process and analyze the metal flow law; the simulation results are in accord with the test results. Then, a 3D model for tensile-shear process was constructed from the results of the 2D model; the load-displacement curve and the failure mode were obtained. The simulation results are in good agreement with test results with an error of 3.4~//oo. Finally, theoretical formulas for the calculation of the joint strength was proposed based on the two failure modes in tensile-shear tests, which are neck-fracture failure mode and button separation mode. The formulas were verified by the tests of twelve types of clinched joints. Results show that the calculation error of the joint strength is 8.9~.