华南理工大学学报(自然科学版) ›› 2009, Vol. 37 ›› Issue (8): 24-28.

• 机械工程 • 上一篇    下一篇

模内镶件注塑膜片的粘弹性本构模型

陈松茂1  阮锋1  蔡考群2   

  1. 1. 华南理工大学 机械与汽车工程学院, 广东 广州 510640; 2. 深圳市 群达行精密模具有限公司, 广东 深圳 518129
  • 收稿日期:2008-05-12 修回日期:2008-10-14 出版日期:2009-08-25 发布日期:2009-08-25
  • 通信作者: 陈松茂(1978-),男,博士,讲师,主要从事模具计算机技术及特种塑性加工的研究. E-mail:smchen@scut.edu.cn
  • 作者简介:陈松茂(1978-),男,博士,讲师,主要从事模具计算机技术及特种塑性加工的研究.
  • 基金资助:

    广州市科技计划项目(2007Z-139091);深圳企业委托项目(B01-D8081640)

Viscoelastic Constitutive Model of In-Mould Decoration Films

Chen Song-mao Ruan Feng Cai Kao-qun2   

  1. 1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. Kunda Mould Co., Ltd., Shenzhen 518129, Guangdong, China
  • Received:2008-05-12 Revised:2008-10-14 Online:2009-08-25 Published:2009-08-25
  • Contact: 陈松茂(1978-),男,博士,讲师,主要从事模具计算机技术及特种塑性加工的研究. E-mail:smchen@scut.edu.cn
  • About author:陈松茂(1978-),男,博士,讲师,主要从事模具计算机技术及特种塑性加工的研究.
  • Supported by:

    广州市科技计划项目(2007Z-139091);深圳企业委托项目(B01-D8081640)

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.

关键词: 模内镶件, 注塑, 粘弹性, 本构模型, 静水压力

Abstract:

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.

Key words: in-mould decoration, injection molding, viscoelasticity, constitutive model, hydrostatic pressure