针对基于生物可降解材料聚乳酸-羟基乙酸共聚物（PLGA）的热压成型工艺仿真研究中,粘弹性材料模型参数缺乏的问题,通过单轴拉伸应力松弛试验,研究了生物可降解材料PLGA在5种温度状态下的应力松弛性能。基于时间-温度等效原理,平移得到60℃的松弛模量主曲线,并采用广义Maxwell模型对此主曲线进行拟合。结果表明：随着温度的升高,PLGA材料的松弛时间明显缩短,且拟合曲线与原数据误差较小,说明广义Maxwell模型能较理想地模拟PLGA材料的应力松弛行为。这些数据的获得为后续仿真研究提供了参考。
The stress relaxation properties of biodegradable polymer poly（lactic-co-glycolic acid）（PLGA） at different temperatures were studied through the uniaxial tension relaxation test.It is found that the relaxation properties of PLGA have obvious correlation with the temperature.The relaxation time decreases significantly as the temperature increases.By application of the time-temperature equivalence principle,a master relaxation curve at a reference temperature of 60 ℃ was constructed by horizontally shifting relaxation experimental data of PLGA at higher temperature.The generalized Maxwell model was applied to simulate the relaxation behavior of PLGA.The result shows that the simulation and experiments relatively agree with each other.
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