Buckling and strength analysis of panels with discrete stiffness tailoring
Buckling and strength analysis of panels with discrete stiffness tailoring
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具有离散刚度剪裁的面板的屈曲和强度分析
DOI：
10.1016/j.compstruct.2019.111672
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发表时间：
2020
影响因子：
6.3
通讯作者：
Culliford L
中科院分区：
文献类型：
--
作者：
Culliford L
从理论上讲，平板刚度的连续变化可以使屈曲性能提高60%。然而，转向纤维制造方法不能在保持高沉积速率的同时实现改进所需的最小曲率半径。另一种概念是离散刚度定制（DST），其通过角度的离散变化来改变层片内的刚度，与高速沉积方法（例如高级带铺设）兼容。通过在准各向同性[±45/90/0] 2S层合板中重新分布材料同时保持铺层百分比的简单示例，实验和理论均表明DST可将屈曲应力提高至少15%，并且在离散角度变化区域（接缝）中没有失效迹象。然而，通过虚拟和实验测试获得的接缝的抗拉强度降低意味着在主载荷方向上增加的屈曲性能需要与横向强度损失相平衡。
Continuous variation of stiffness across flat plates has been shown, theoretically, to improve buckling performance by up to 60%. However, steered fibre manufacturing methods cannot achieve the minimum radius of curvature required for improvement whilst maintaining a high deposition rate. An alternative concept, Discrete Stiffness Tailoring (DST), which varies stiffness within a ply through discrete changes of angle, is compatible with high rate deposition methods such as Advanced Tape Laying. Through the simple example of redistribution of the material in a quasi-isotropic [±45/90/0]2Slaminate whilst maintaining ply percentages, DST is shown both experimentally and theoretically to improve buckling stress by at least 15% with no indication of failure in regions of discrete angle change (seams). However, the reduced tensile strength of seams obtained by virtual and experimental testing means that increased buckling performance in the principle load direction needs to be balanced against loss of transverse strength.