作　　者： ; ; (蔡考群）;

机构地区： 华南理工大学机械与汽车工程学院

出　　处： 《华南理工大学学报（自然科学版）》 2009年第8期24-28,共5页

摘　　要： 在G sell理论和DSGZ模型基础上,提出了模内镶件注塑膜片的粘弹性本构模型———CF-DSGZ模型.该模型不仅可以描述膜片材料的屈服和应变软化、应变硬化特性,还考虑了不同加载方式下静水压力的影响,克服了DSGZ模型预测玻璃化以上温度时材料的真实应力?应变具有较大误差的缺陷.文中以PMMA-IRK-304膜片材料为例,通过不同温度和拉伸速度下的单向拉伸实验和常温单向拉伸与压缩实验验证模型的准确性.结果表明,除了初始小应变阶段存在若干小偏差外,CF-DSGZ模型预测曲线与实验数据吻合得很好. Based on the G＇sell theory and the DSGZ model, a viscoelastic constitutive model of in-mould decoration films called CF-DSGZ is proposed. CF-DSGZ model not only describes the characteristics of yielding, strain softening and strain hardening of films well, but also fully considers the influence of hydrostatic pressure in different load- ing modes. Moreover, it reduces error of actual stress-strain predicted by the DSGZ model when films are heated o- ver the glass transition temperature. According to the results of high-temperature uniaxial tension tests at different temperatures and tensile speeds, as well as the uniaxial tension and compression tests at room temperature for inmould decoration films PMMA-IRK-304, it is found that the proposed model is correct because the predicted curves agree well with the experimental ones except for a few small errors at the initial strain range.

关 键 词： 模内镶件 注塑 粘弹性 本构模型 静水压力

领　　域： [化学工程]