航空MDYB-3定向有机玻璃蠕变行为温度效应试验研究

Experimental Study of Creep Behaviors of MDYB-3 PMMA Under Different Temperatures

对航空MDYB-3定向有机玻璃不同温度下的蠕变行为进行了试验研究。得到了有机玻璃在20,50℃和75℃和不同应力下的蠕变曲线,结果表明:有机玻璃蠕变分为三个阶段,随着温度和应力的增大,有机玻璃的蠕变速率加快,蠕变断裂伸长增大,抗蠕变断裂时间变短。运用陈化理论,Norton公式和指数公式分别描述了蠕变三个阶段的特性。

Creep behaviors of aeronautic Polymethyl Methacrylate （MDYB-3 PMMA） under different temperatures were experimentally investigated. The creep curves of PMMA at 20℃, 50℃ and 75℃ and with various stresses were obtained. It was indicated that the duration curves of creep could be divided into three phases. Experimental results showed that the steady creep accumulation speed was increasing with the temperature and stress increasing, and the rupture stretch was increasing accordingly, but the failure time was reducing. The Chen theory, Norton formula and exponential expression were used to describe three phases of creep behaviors respectively.