| 固态高聚物的应力松弛行为 |
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| 引用本文： | 罗文波,杨挺青. 固态高聚物的应力松弛行为[J]. 高分子材料科学与工程, 2002, 18(2): 97-99 |
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| 作者姓名： | 罗文波 杨挺青 |
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| 作者单位： | 1. 华中理工大学力学系,湖北,武汉,430074;湘潭大学基础力学与材料工程研究所,湖南,湘潭,411105
2. 华中理工大学力学系,湖北,武汉,430074 |
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| 基金项目： | 国家自然科学基金 (196 32 0 30 )，湖南省教委高等学校科研项目 (99C12 2 )资助 |
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| 摘 要： | 研究了高密度聚乙烯（HDPE）和聚丙烯（PP）变形过程的应变率敏感性和应力松弛行为，实验发现应力松弛行为与应变历史有关，加载过程中的应力松弛表现为应力随时间的增长而减小，卸载过程中应力松驰则表现出不同的现象，在卸载初始阶段，应力逐渐减小并趋于其平衡值，当卸载程度较大，其应力松弛表现为应力随时间逐渐增大并趋向平衡值。
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| 关 键 词： | 固态高聚物 应变率 应力松弛 非线性 粘弹性 敏感性 |
| 文章编号： | 1000-7555(2002)02-0097-03 |
| 修稿时间： | 2000-05-23 |
STRESS RELAXATION BEHAVIOR OF SOLID POLYMERS |
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| LUO Wen bo ,,YANG Ting qing. STRESS RELAXATION BEHAVIOR OF SOLID POLYMERS[J]. Polymer Materials Science & Engineering, 2002, 18(2): 97-99 |
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| Authors: | LUO Wen bo YANG Ting qing |
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| Affiliation: | LUO Wen bo 1,2,YANG Ting qing 1 |
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| Abstract: | The strain rate sensitivity and stress relaxation behavior were investigated in this paper. The stress relaxation behavior is dependent on the strain history. The stress decreases with increasing time and tends to its equilibrium value during the relaxation segments in the uploading. For stress relaxation segments after strain reversal(unloading), a curious behavior was observed. When the magnitude of strain reversal is small, the stress decreases as it does during the relaxation segments in the uploading, whereas when the magnitude of strain reversal is large, the stress tends to increase with time and reach its equilibrium value. A reasonable explanation to this strain history dependent stress relaxation behavior was given. |
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| Keywords: | polymer strain rate stress relaxation nonlinear viscoelasticity |
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