When investigating materials to be utilized, attention inevitably focuses on their resistance over the service life. Despite the popularity of amorphous polymers, ranging from their applications in structural components to their ability to increase the toughness of biocomposites, the investigation of their short- to long-term resistance has been considerably limited to date. Here, an improved testing equipment and model are proposed to describe the resistance of amorphous polymers under cyclic loadings. Two failure mechanisms are considered for the low- to high-cycle regimes: plastically induced and fatigue, and a history dependent fatigue damage model and a plastic evolution law with a relaxed shear resistance are proposed. Against state-of-the-art models, the proposed model is able to simulate the experimentally observed ultralow- to high-cycle failure and service life under torsional and multiaxial loads. The experimental and model results are similar, suggesting that the model is a capable tool for simulating costly and time-consuming tests. Interestingly, the predicted progress of material failure with plastic deformation was found to resemble the observed development of accumulated void volume. The failure (void volume) development strongly influenced the onset and growth of tertiary cyclic creep and thus, the entire service life. The amorphous structure also appeared to effectively resist failure under torsion.

在研究要使用的材料时，注意力不可避免地集中在它们在使用寿命期间的抵抗力。尽管无定形聚合物很受欢迎，从它们在结构部件中的应用到它们增加生物复合材料韧性的能力，但迄今为止对其短期到长期抵抗力的研究相当有限。在这里，提出了一种改进的测试设备和模型来描述无定形聚合物在循环载荷下的阻力。对于低周到高周制度，考虑了两种失效机制：塑性诱导和疲劳，并提出了历史相关疲劳损伤模型和具有松弛抗剪强度的塑性演化规律。对抗最先进的模型，所提出的模型能够模拟实验观察到的在扭转和多轴载荷下的超低到高周失效和使用寿命。实验结果和模型结果相似，表明该模型是模拟昂贵且耗时的测试的有力工具。有趣的是，发现塑性变形材料失效的预测进展类似于观察到的累积空隙体积的发展。失效（空隙体积）的发展强烈影响三次循环蠕变的开始和增长，从而影响整个使用寿命。无定形结构似乎也能有效地抵抗扭转失效。表明该模型是模拟昂贵且耗时的测试的有力工具。有趣的是，发现塑性变形材料失效的预测进展类似于观察到的累积空隙体积的发展。失效（空隙体积）的发展强烈影响三次循环蠕变的开始和增长，从而影响整个使用寿命。无定形结构似乎也能有效地抵抗扭转失效。表明该模型是模拟昂贵且耗时的测试的有力工具。有趣的是，发现塑性变形材料失效的预测进展类似于观察到的累积空隙体积的发展。失效（空隙体积）的发展强烈影响三次循环蠕变的开始和增长，从而影响整个使用寿命。无定形结构似乎也能有效地抵抗扭转失效。