Laminate design for optimised in-plane performance and ease of manufacture
Laminate design for optimised in-plane performance and ease of manufacture
复制标题
层压板设计可优化面内性能并易于制造
DOI：
10.1016/j.compstruct.2017.06.061
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发表时间：
2017
影响因子：
6.3
通讯作者：
R. Butler
中科院分区：
文献类型：
--
作者：
M. Nielsen;Kevin Johnson;A. Rhead;R. Butler
提出了新的结构效率图，表明当前的设计实践会产生额外的质量，因为：（i）层压板平衡轴与主载荷轴不对齐，以及（ii）主载荷比在具有固定层数百分比的零件内变化。这些图表为航空航天设计中的纤维转向和层压板定制提供了重要机会。此外，研究表明，标准层板角度（0°、+45°、-45° 和 90°）在未固化状态（成型期间）的相邻层压板之间具有不兼容的变形模式；这种模式会在制造过程中促进起皱缺陷的出现，从而显着降低零件强度。提出了一种新的配方，使任何标准角度层压板都可以被由两个非标准角度±ψ和±ψ组成的层压板取代，并具有等效的面内刚度。非标准层角度被证明可以促进兼容的变形模式，并在可成形性方面提供巨大的潜力，从而提高生产率并减少对所谓的制造击倒因素的需求。
New structural efficiency diagrams are presented, showing that current design practice incurs additional mass because: (i) laminate balancing axes are not aligned with principal loading axes and (ii) principal loading ratios vary within a part with fixed ply percentages. These diagrams present significant opportunities for fibre steering and laminate tailoring in aerospace design. Moreover, it is shown that standard ply angles (0°, +45°, −45° and 90°) have incompatible modes of deformation between adjacent sublaminates in their uncured state (during forming); such modes can promote the occurrence of wrinkling defects during manufacture which reduce part strength significantly. A new formulation is presented to enable any standard angle laminate to be replaced by a laminate consisting of two non-standard angles, ±ϕand ±ψ, with equivalent in-plane stiffness. Non-standard ply angles are shown to promote compatible modes of deformation and offer significant potential, in terms of formability, thereby increasing production rates and reducing the need for so-called manufacturing knockdown factors.