In the extrusion of clad composite materials with different flow stresses are usually used. This causes an inhomogeneous material flow which can induce sleeve or core fracture. In the present study, the material flow during indirect extrusion of copper-clad aluminum (CCA) rods was analyzed by means of experimental and numerical investigations throughout the process. In order to provide material models for the numerical analysis hot compression tests of the aluminum alloy EN AW-1080A and the copper alloy CW004A were carried out. The indirect extrusion was performed using a conical die with a semi die angle of 45° and an extrusion ratio of 14.8:1. The container was heated to 330°C, while billet, die, and ram were kept at room temperature. The extrusion trial was then modeled with the FEM based software DEFORM 2D. Cross sections were taken from the extruded rod and compared to the corresponding sections of the simulation with regard to the development of the equivalent copper cross section. As a result, the development of extrusion force and equivalent copper cross section could be clarified. The numerical investigations indicated a higher flow velocity for the aluminum core than for the copper sleeve at the bearing channel. Therefore, high tensile stresses and fractures of the copper sleeve were induced. Additionally, the validated numerical analysis made possible to determine the conditions for a successful co-extrusion of the analyzed CCA rod.

在挤出复合材料时，通常使用具有不同流动应力的复合材料。这会导致材料流动不均匀，从而导致套管或芯子断裂。在本研究中，通过在整个过程中进行的实验和数值研究，分析了间接挤出覆铜铝（CCA）棒过程中的材料流动。为了提供用于数值分析的材料模型，对铝合金EN AW-1080A和铜合金CW004A进行了热压缩测试。使用具有45°的半模角和14.8：1的挤出比的锥形模头进行间接挤出。将容器加热到330°C，同时将钢坯，模具和撞锤保持在室温下。然后使用基于FEM的软件DEFORM 2D对挤出试验进行建模。横截面取自挤压棒，并就等效铜横截面的发展与模拟的相应部分进行比较。结果，可以澄清挤出力和等效铜横截面的发展。数值研究表明，在轴承通道处，铝芯的流速高于铜套的流速。因此，引起高的拉伸应力和铜套的断裂。另外，经过验证的数值分析使确定分析的CCA棒成功共挤出的条件成为可能。可以明确挤压力和等效铜截面的发展。数值研究表明，在轴承通道处，铝芯的流速高于铜套的流速。因此，引起高的拉伸应力和铜套的断裂。另外，经过验证的数值分析使确定分析的CCA棒成功共挤出的条件成为可能。可以明确挤压力和等效铜截面的发展。数值研究表明，在轴承通道处，铝芯的流速高于铜套的流速。因此，引起高的拉伸应力和铜套的断裂。另外，经过验证的数值分析使确定分析的CCA棒成功共挤出的条件成为可能。