Abstract In recent times, the application of sheet molding compounds (SMC) has been strongly restricted due to poor mechanical simulation results. These poor results occur because the complex internal geometry of SMCs makes it difficult to establish a precise simulation model. In the case of thermoplastic SMCs in particular, a high viscosity matrix and high molding pressure requirement lead to extreme fiber disturbance. This study utilizes the Mori-Tanaka (MT) model and the Equivalent Laminate (EL) model for the prediction of Young's modulus and the tensile strength of one CF/PA6 SMC, also referred to as CTT (chopped carbon fiber tape reinforced thermoplastics), with four different tape lengths. The complex internal geometries are measured using two X-ray computed tomography (CT) methods, with the quantified fiber orientation information input into the relevant models. The obtained simulation results were found to be in agreement with the experimental results. Within this study, the effect of the fiber length on Young's modulus and the tensile strength were investigated via the two models, and the advantages and disadvantages of both models are discussed.

中文翻译：

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基于 X 射线计算机断层扫描的内部几何考虑因素对 CF/PA6 片状模塑料的机械建模

摘要 近年来，由于机械模拟结果不佳，片状模塑料（SMC）的应用受到强烈限制。之所以出现这些糟糕的结果，是因为 SMC 的内部几何结构复杂，难以建立精确的仿真模型。特别是在热塑性 SMC 的情况下，高粘度基体和高成型压力要求会导致极端的纤维干扰。本研究利用 Mori-Tanaka (MT) 模型和等效层压板 (EL) 模型来预测一种 CF/PA6 SMC，也称为 CTT（短切碳纤维带增强热塑性塑料）的杨氏模量和拉伸强度，四种不同的胶带长度。使用两种 X 射线计算机断层扫描 (CT) 方法测量复杂的内部几何形状，将量化的纤维取向信息输入到相关模型中。发现获得的模拟结果与实验结果一致。在本研究中，通过两种模型研究了纤维长度对杨氏模量和拉伸强度的影响，并讨论了两种模型的优缺点。