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在研究层合板在复杂荷载下的极限强度时,提出了基于层合板基本强度和最佳应力比实验强度所确定的层合板张量型强度准则和层合板联合强度理论。通过建立新的层合板铺层刚度退化理论并用实验测定“均衡型刚度退化系数”,实现了LPE包络线预测,进而提出层合板退化张量型强度准则。该准则是一种由单向板基本刚度、强度性能,辅以均衡型刚度退化系数来预测各种铺层序列的层合板在复杂荷载下最大承载能力的强度判据和方法。上述强度准则与[±θ]S层合板的单向拉伸、[±45]S、[0/90]S层合板平板拉剪以及(0/90]S、[0±45/90]S和(0/45]S层合管状件的双向荷载强度实验结果相当吻合。所提出的层和板极限强度判据和最大承裁力的估算方法对玻纤复合材料层合结构的工程强度设计,具有实际的指导意义和实用价值。
In the study of the ultimate strength of laminates under complex loads, the tensor-type strength criterion for laminates and the combined strength of laminates were proposed based on the basic strength of laminates and the optimal stress ratio. By establishing a new theory of laminate laminate stiffness degradation and experimentally measuring the “equilibrium stiffness degradation coefficient”, the LPE envelope prediction is realized, and then the laminate tensor tensile strength criterion is proposed. This criterion is an intensity criterion and method for predicting the maximum bearing capacity of laminates with various ply sequences based on the basic stiffness and strength properties of the unidirectional plate and the balanced stiffness degradation coefficient. The above strength criterion is uniaxially stretched with [±θ]S laminates, [±45]S, [0/90]S laminate flat shears and (0/90)S, [0±45/90]S The experimental results of the biaxial load strength of the (0/45)S laminated tubular element are in good agreement. The proposed layer and plate ultimate strength criterion and the maximum method for the determination of the bearing force are applied to the engineering strength design of the laminated structure of glass fiber composites. , with practical guidance and practical value.