论文标题
聚合物膜在大型菌株中的冷卷的力学和模型 - 一种与速率无关的方法
Mechanics and Modeling of Cold Rolling of Polymeric Films at Large Strains -- A Rate-Independent Approach
论文作者
论文摘要
我们通过有限元建模来分析平面应变冷滚动过程,但要缓慢应变速率。在低温下,在滚动过程中的应变速率缓慢和中等厚度的减小(在此处研究的特定类型的聚合物膜可以忽略Bauschinger效应),物质建模的任务已大大简化,并使我们能够在计算上效率高,但具有准确的,有限的,有限的变形速率依赖性的弹性物质行为(ISORT)(ISORT)。基于(i)低弹性的有限变形弹性塑料材料行为,以及ii)乘法可塑性,并在Abaqus显式内进行了冷滚动。来自两个配方的预测,即低弹性和乘法分解,与实验观察到的滚动载荷非常匹配。我们发现,在此处所述的条件下,不需要专门的超塑性/粘膜塑料模型来描述聚合物膜的特定混合物的行为,从而显着加快了稳态滚动模拟的计算。此外,由于聚合物在大型菌株中的聚合物膜中的较大弹性拉伸,因此发现使用经典的刚性塑料建模(通常适用于金属)。
We analyze plane strain cold rolling processes, at large strains but slow strain rates, by finite element modeling. At low temperatures, slow strain rates, and moderate thickness reductions during rolling (at which Bauschinger effect can be neglected for the particular class of polymeric films studied here), the task of material modeling is greatly simplified, and enables us to deploy a computationally efficient, yet accurate, finite deformation rate-independent elastic-plastic material behavior (with inclusion of isotropic-hardening). The finite deformation elastic-plastic material behavior based on (i) hypoelasticity, and ii) multiplicative plasticity, are programmed and carried out for cold rolling within Abaqus Explicit. Predictions from both the formulations, i.e., hypoelastic and multiplicative decomposition, exhibit a close match with the experimentally observed rolling loads. We find that no specialized hyperlastic/visco-plastic material model is required to describe the behavior of the particular blend of polymeric films, under the conditions described here, thereby significantly speeding up the computation for steady-state rolling simulations. Moreover, the use of classical rigid-plastic modeling (which is often applicable to metals) is found to greatly underestimate the rolling loads for polymers, due to large elastic stretches in the polymer films at large strains.