Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (8): 24-28.

• Mechanical Engineering • Previous Articles     Next Articles

Viscoelastic Constitutive Model of In-Mould Decoration Films

Chen Song-mao1  Ruan Feng1  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）

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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