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- 2018
考虑热效应复合材料典型壁板结构模态演变规律
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Abstract:
以复合材料加筋板和连接板为研究对象，进行了考虑材料物性变化、热应力及热变形影响因素的跨越屈曲温度热模态分析，研究了壁板结构的模态演变规律。结果表明：热屈曲前，结构各阶频率因受材料物性变化和热应力的影响逐渐减小，而热屈曲后引起的大变形起到增加结构刚度的作用，频率转而增大。热效应会导致结构模态发生相互演变的现象，且高温阶段具有模态密集特征；加筋板的初始挠度、加筋尺寸和方式不仅改变结构热屈曲温度，也会使模态形式发生变化并呈现局部化特点；连接板结构均匀受热后产生的热变形，会"刚化"与其相似的模态，使该阶模态随着温升跃迁至高阶位置。 A thermal modal analysis method was established by considering the effects of material property's change, thermal stress and deformation to investigate thermal modal evolution of composite stiffened and connecting plates. The calculation results show that material property's change and thermal stress result in the increasing in modal frequencies under thermal buckling temperature. In post-buckling stage, the nonlinear deformation can increase the stiffness of panel structures, which makes the modal frequencies increase. Mode changes occur during the whole warming-up process and modals tend to be dense; Initial deflections, size of stiffeners and reinforcement patterns have great influence on the critical buckling temperature of stiffened plates. Mode shapes are also changed and appear characteristics of localized. For connecting plates, due to the similarity of thermal deformation and modal shape, the modal frequency will jump from the lower order to the higher. 国家自然科学基金（11772107）
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