简支矩形复合材料薄板压缩屈曲后的极限强度

本文通过283块简支矩形玻璃钢薄板的压缩屈曲后极限强度的试验,证明了复合材料薄板在屈曲失稳后仍能继续承载,以玻璃钢为例,可以超过临界载荷的十几倍。文中对薄板的极限强度进行了大挠度和小挠度理论分析,结合复合材料的能量强度理论,最后得出有关极限强度计算公式的C参数曲线,对于45°方向的薄板与试验结果较符合,对于经纬向薄板当β<0.11时比试验结果略大。文中给出的C参数可供产品设计时参考。

Ultimate Strength of Postbuckling for Simply Supported Rectangular Composite Thin Plates under Compression

It is proved that the ultimate strength of postbuckling for simply supported rectangular composite thin plates under compression is far higher than their buckling stress through the tests of 283 rectangular composite thin laminates in this paper.The ultimate strength of the composite thin plates is studied using large-deflection theory and small-deflection theory of thin plates.According to the failure criterion of the composites ultimate strength is found finally.It is in accordance with the experimental values,for the plates having 45 degrees off-axial,and for longitudinal and latitudinal plates.when β<0.11,the theoretical values are higher.The coefficient C given in this paper may be referred to in product designing.