ABSTRACT The aim of this study is to quantify the impact of different rheological models on the accuracy of LPIM numerical simulation. Two different feedstocks were formulated, and rheological profiles were characterised using a rotational rheometer from which the parameters of different rheological models were extracted and then implemented in an Autodesk Moldflow package. Mould filling patterns into a rectangular shape mould cavity were simulated, and then validated using real-scale injections. Depending on the feedstock rheological behaviour, models are not always well adapted to predict the mixture viscosity over the entire shear rate range. Because injections were performed at constant volumetric flow, all the rheological models were successfully used to predict the injected length. However, the simulated pressure through the mould cavity was only accurately simulated using the second-order or matrix models since these viscosity models were able to adequately capture the feedstock behaviour in the shear rate range representing the injections.

中文翻译：

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流变模型对低压粉末注射成型数值模拟的影响

摘要 本研究的目的是量化不同流变模型对 LPIM 数值模拟精度的影响。配制了两种不同的原料，并使用旋转流变仪表征流变特性，从中提取不同流变模型的参数，然后在 Autodesk Moldflow 软件包中实施。对矩形模腔中的模具填充模式进行了模拟，然后使用真实比例的注射进行了验证。根据原料的流变行为，模型并不总是很好地适用于预测整个剪切速率范围内的混合物粘度。因为进样是在恒定体积流量下进行的，所以所有流变模型都成功地用于预测进样长度。然而，