| 单向EMC层合板非线性弯曲行为 |
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| 引用本文： | 熊志远,王正道,李郑发. 单向EMC层合板非线性弯曲行为[J]. 复合材料学报, 2010, 27(5): 156-164 |
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| 作者姓名： | 熊志远 王正道 李郑发 |
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| 作者单位： | 北京交通大学,土木建筑工程学院,工程力学所,北京,100044 |
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| 基金项目： | 教育部新世纪人才项目; 国家自然科学基金(10872025) |
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| 摘 要： | 对单向形状记忆聚合物复合材料(EMC)层合板在其基体玻璃化转变温度(Tg)之上的弯曲行为进行了研究。首先介绍了EMC层合板多约束弯曲变形实验, 并依据纤维微屈曲变形特征建立其形函数; 然后分析得出弯曲层合板的各分应变能及由其组成的总应变能; 在此基础上, 依据虚功原理, 通过总应变能推导出外力偶矩与曲率、 等效弯曲应变之间的非线性关系式。结果表明: 在EMC板的弯曲过程中, 中性层很快接近板的拉伸表面, 且中性层位置及板的弯曲行为对板的面内剪切模量非常敏感; 在板的初始弯曲阶段, 弯矩与曲率遵循传统单向板的线弹性弯曲理论; 而后随着曲率的增加, 弯矩与曲率关系遵循本研究所提出的非线性关系, 所得理论结果与EMC层合板的四点纯弯曲实验现象较为吻合。
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| 关 键 词： | EMC层合板 微屈曲 弯曲行为 虚功原理 |
| 收稿时间： | 2009-09-22 |
| 修稿时间： | 2009-12-24 |
Nonlinear bending behavior of unidirectional EMC laminates |
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| XIONG Zhiyuan,WANG Zhengdao,LI Zhengfa. Nonlinear bending behavior of unidirectional EMC laminates[J]. Acta Materiae Compositae Sinica, 2010, 27(5): 156-164 |
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| Authors: | XIONG Zhiyuan WANG Zhengdao LI Zhengfa |
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| Affiliation: | XIONG Zhiyuan,WANG Zhengdao,LI Zhengfa(Department of Engineering Mechanics,School of Civil Engineering,Beijing Jiao-Tong University,Beijing 100044,China) |
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| Abstract: | A study was performed on the nonlinear bending behavior of unidirectional fiber-reinforced elastic memory composite(EMC) laminates above the glass transition temperature of its resin(Tg).A series of multi-constraint bending experiments about EMC laminates were firstly introduced.According to the experimental results,the shape function of microbuckled fibers was proposed.Different strain energies of EMC laminate under bending were then analyzed.Finally,the bending moment as functions of curvature and equival... |
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| Keywords: | EMC laminate microbuckling bending behaviour principle of virtual work |
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