Stress Relaxation Study of Paper and Plastic film based Packaging Material
Stress Relaxation Study of Paper and Plastic film based Packaging Material
复制标题
纸和塑料薄膜包装材料的应力松弛研究
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Lu Qi
中科院分区：
文献类型：
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作者：
R. Roy;Lu Qi
本硕士论文主要研究了包装材料的时效变形问题。进行了力学试验，以监测纸上应力下降速率。采用不同的理论建立了粘弹性模型，并与实验得到的应力松弛进行了比较。结果表明，修正的双单元麦克斯韦模型最适合描述所讨论材料的弛豫行为。利用MATLAB推导了材料在恒伸长条件下随时间变化的应力松弛方程。利用ABAQUS软件建立有限元模型，分析纸板和层压板的应力松弛行为。将仿真结果与实验结果和理论粘弹性模型进行了比较。此外，还对带侧裂纹的试件进行了研究。
In this master degree thesis the time dependent deformation of packaging material is studied. Mechanical experimental tests were carried out to monitor the stress decreasing rate on paper. Several viscoelastic models were constructed using various theories and compared with the obtained experimental stress relaxation. The results showed that the modified two-unit Maxwell model suits the best to describe the relaxation behavior of the material in discussion. MATLAB was used to derive the stress relaxation equations which indicate the time dependent stress relaxation behavior of the materials for constant elongation. FE models were created by ABAQUS for analyzing the stress relaxation behavior of the paperboard and the laminate. The simulation results were then compared with the experimental results and the theoretical viscoelastic model. Additionally, specimens with a side crack were also studied.