The mechanical behaviour of a high performance polycaprolactone based polyurethane elastomer (PCL) up to large strain levels, cyclic loading and equibiaxial stress has been assessed. The PCL can be categorised as a rubber-like material, thus, showing nonlinear stress-strain behaviour. The materials elastic network is based on a high molecular weight PCL polyol which gives the material its elastomeric behaviour similar to polyurethanes. In this work, mechanical testing capturing the major features of the stress-strain curve under different loading conditions is performed. Both, uni-axial loading-unloading curves and bulge test are thoroughly studied through the addition of digital image correlation (DIC) to measure the strain field. Results show the presence of hysteresis and loading configuration dependence. Then, two well-known hyperelastic constitutive models, the Arruda-Boyce eight-chain and Bergstrom-Boyce, were fitted to the uni-axial monotonic and cyclic test data and compared to the bulge test experimental results through finite element analysis (FEA) in Abaqus.

中文翻译：

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基于聚己内酯的聚氨酯弹性体机械响应的本构建模：通过膨胀测试进行有限元分析和实验验证

已经评估了高性能聚己内酯基聚氨酯弹性体 (PCL) 在大应变水平、循环载荷和等双轴应力下的机械行为。PCL 可归类为类橡胶材料，因此表现出非线性应力应变行为。材料弹性网络基于高分子量 PCL 多元醇，赋予材料类似于聚氨酯的弹性行为。在这项工作中，进行了机械测试，捕获了不同加载条件下应力-应变曲线的主要特征。通过添加数字图像相关（DIC）来测量应变场，对单轴加载-卸载曲线和膨胀试验进行了深入研究。结果显示存在滞后和加载配置依赖性。然后，