The nonlinear finite deformations and ultimate failure modes of photo-cured polymers are closely related to the ambient temperatures, typically exhibiting enhanced stretchability and a peak of ultimate break strain near the glass transition temperature ${\mathit{T}}_g$. The origin of this type of temperature-dependent failure phenomenon lies in the evolution of visco-elasto-plastic flowing dynamics as well as the alteration of polymer chain mobility during glass transition. In the past few decades, theoretical models for the strength of polymers were developed independent of the visco-elasto-plastic deformation history and the glass transition dynamics. These models could not provide reasonable explanations for the peak of ultimate break strain in photo-cured polymers, nor predict the poor stretchability at ultra-low and ultra-high temperatures. In this paper, we propose a general model for the temperature-dependent deformation and tensile failure of photo-cured polymers, in which the breaking phenomenon is dominated by a competition between the brittle failure at low temperature, the visco-plastic failure at moderate temperature and the hyperelastic failure at high temperature. Through the comparison between theoretical predictions and typical experiments, the model is proved to be efficient in predicting the deformation and failure of both photo-cured thermosets and thermoplastics.

光固化聚合物的非线性有限变形和极限破坏模式与环境温度密切相关，通常表现出增强的可拉伸性，并且在玻璃化转变温度附近表现出极限断裂应变的峰值。 ${\mathit{Ť}}_G$。这类与温度相关的破坏现象的起源在于粘弹塑性流动动力学的演变以及玻璃化转变过程中聚合物链迁移率的变化。在过去的几十年中，开发了关于聚合物强度的理论模型，而与粘弹塑性变形历史和玻璃化转变动力学无关。这些模型无法为光固化聚合物的最终断裂应变峰值提供合理的解释，也无法预测在超低温和超高温下的拉伸性差。在本文中，我们提出了光固化聚合物随温度变化的变形和拉伸破坏的通用模型，其中断裂现象主要由低温下的脆性破坏之间的竞争所决定，中等温度下的粘塑性破坏和高温下的超弹性破坏。通过理论预测和典型实验之间的比较，该模型可有效预测光固化热固性塑料和热塑性塑料的变形和破坏。