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总览 评价 涂金岽 , 孙慧玉 * ( 南京航空航天大学结构强度研究所,南京 210016; ) 摘要: 单向纤维增强形状记忆聚合物复合材料(EMCs)作为智能材料具有广阔的应用前景。在热激活状态下,形状记忆聚合物基体处于软化状态,不能对纤维起良好支撑,在承受
涂金岽, 孙慧玉*
(
南京航空航天大学结构强度研究所,南京 210016; )
摘要:
单向纤维增强形状记忆聚合物复合材料(EMCs)作为智能材料具有广阔的应用前景。在热激活状态下,形状记忆聚合物基体处于软化状态,不能对纤维起良好支撑,在承受弯曲载荷时纤维易发生微屈曲,使层合板达到较大应变而不发生破坏。根据纤维屈曲方向的不同可分为面内屈曲和面外屈曲两种模式,依据最小能量原理,比较两种模式下总变形能的大小,从而确定哪种模式更易于发生,理论分析结果与实验结果吻合较好。
关键词:
复合材料;形状记忆聚合物;纤维微屈曲;屈曲模式;最小能量原理
Tu Jindong, Sun Huiyu*
(
Institute of Structure and Strength, Nanjing University of Aeronautics and Astronautics, Nanjing 210016; )
Abstract:
As intelligent materials, unidirectional fiber reinforced shape memory polymer(SMP) composites(Elastic Memory Composites,EMCs) have broad application foreground. The SMP matrix is softened at activating temperature and fibers can not be well supported. Fiber microbuckling tends to occur when a bending load is applied, which enables the laminate to reach higher bending strain without fracture. Two kinds of buckling modes, in-plane buckling and out-of-plane buckling, are observed in former study. According to the minimum energy principle, the real microbuckling mode is determined in analysis by comparing the total deformation energy for different modes. Theoretical results are in good agreement with experiments.
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