Creep behavior of high-density polyethylene (HDPE) was investigated. HDPE has many engineering applications in different industries such as piping systems, cable and wiring, automotive parts, storage containers, and biomedical implants. The temperatures chosen were 23, 53, and 82 °C based on the service temperature range for application in design of automotive fuel tanks. Creep strength decreased and creep strain as well as creep strain rate increased by increasing temperature. The Larson-Miller parameter widely used for metallic materials was able to correlate time to rupture, stress, and temperature data of HDPE. The Monkman-Grant relation was successfully used to correlate minimum creep rate and time to rupture. The Findley power law and time-stress superposition principle (TSS) were used to represent nonlinear viscoelastic creep curves. Some longer-term creep tests were also conducted at room temperature to evaluate the accuracy of extrapolation of the short-term creep test results to longer creep life predictions. The models used based on the data presented can be used in the design of parts and components made of HDPE where creep failure may be a concern.

研究了高密度聚乙烯（HDPE）的蠕变行为。HDPE在不同行业中具有许多工程应用，例如管道系统，电缆和电线，汽车零件，存储容器和生物医学植入物。根据用于汽车油箱设计的使用温度范围，选择的温度分别为23、53和82°C。随着温度的升高，蠕变强度降低，蠕变应变以及蠕变应变速率增加。广泛用于金属材料的Larson-Miller参数能够使HDPE的破裂时间，应力和温度数据相互关联。Monkman-Grant关系已成功用于关联最小蠕变速率和破裂时间。使用Findley幂律和时间应力叠加原理（TSS）来表示非线性粘弹性蠕变曲线。还在室温下进行了一些长期蠕变测试，以评估将短期蠕变测试结果外推至更长蠕变寿命预测的准确性。基于呈现的数据而使用的模型可用于设计HDPE制造的零件和组件，其中可能会引起蠕变破坏。