【作者】 杨军；

【导师】 黄尚宇； 李友成；

【作者基本信息】 武汉理工大学 ， 材料加工工程， 2004， 硕士

【摘要】 电磁铆接是基于电磁成形技术并结合传统铆接工艺发展起来的一种新型工艺。本文建立了电磁铆接过程的分析模型，并基于ANSYS有限元分析软件对电磁铆接过程进行了动态仿真，通过实验验证了理论和数值模拟分析结果的正确性。 在ANSYS程序中，用一个共同的节点把电路和电磁场区域连接起来，使用直接耦合法，建立了电磁铆接的电路—磁场模型。用ANSYS／Multiphysics模块求解出充电电流、充电电压、放电电流、放电电压和感应电流以及这些参数随时间变化的规律：然后利用两个回路的电流耦合出电磁场，并仿真出磁矢量、磁通密度。ANSYS仿真的结果表明：两个回路的电流的频率相同，感应回路的电流强度非常大，与初级回路处于同一数量级，只是落后一个相位角。 将仿真出的电流和电磁场结果作为初始条件，采用间接／顺序耦合方法分析铆钉结构单元的塑性动力响应。用ANSYS／LS-DYNA求解器动态模拟出铆钉成形过程中塑性单元的变形过程，并计算出铆钉各个单元的应力、应变。利用后处理程序分析了铆钉塑性变形的应力、应变的变化规律，单项最大应力区和单项最大应变区的分布特点。 仿真结果表明：最大应变和最大应力均出现在铆钉顶部中心区域附近，但是二者并不重合，此处的应变变化幅度最大。对φ5mm的铝合金铆钉，铆接变形区最小径高比为5：4。 使用铝合金和不锈钢铆钉进行电磁铆接实验。实验结果与仿真结果基本一致，从而验证了数值仿真结果的正确性。更多还原

【Abstract】 Electromagnetic riveting is a new kind of technology that is based on electromagnetic forming and traditional riveting technologies. In this paper, the analytic model of process of electromagnetic riveting has been established, and the process of riveting has been simulated by ANSYS software. The correctness of analysis results has been proved by corresponding experiments in the end.The circuit and electromagnetic field is connected by one node, and the circuit and electromagnetic field model is built by direct coupling. From the model, we can solve and gain the values and change orders of charging current, charging voltage, discharging current, discharging voltage and inductive current. After that, the electromagnetic fields can be created from two circuits’ currents, and their magnetic rector and flux can be simulated from ANSYS solver. The simulation results indicate that the two circuits’ currents have the same frequency and the inductive current is at the same quantity class as the discharging current.The plastic kinetic response of rivet is analyzed by sequentially coupling which take the first step’s result as initial conditions. The process of forming and changing of plastic elements is simulated by ANSYS/LS-DYNA solver, and also computes the distributing of element stresses and element strains. The postprocessor analyze the distributing characteristic and the changing orders of stresses and strains, as well as maximal stress fields and maximal strain fields.ANSYS simulation results indicate that both the maximal stress and maximal strain locate nearby the central forming field but they are not superposition. The forming extent of the central forming field is very large. From ANSYS solver, aluminum alloy rivet’s minimal ratio is 5 to Finally, we have made some experiments by using aluminum alloy and stainless steel rivets. The result of experiments is very like the simulation. This powerfully proves the correctness of the digit simulation result of electromagnetic riveting.更多还原