In this study, we explore various factors for design of composite structures with ply drops. These factors include: thicknesses, ply stacking sequences, ply drop geometries and manufacturing considerations. In addition, fatigue loading is considered …

In this paper, the influence of three most important design parameters, viz. number of plies dropped-off at a single station, distance between successive drop-offs (stagger distance) and lay-up of a dropped subla-minate, on the strength of the laminate has been studied.

在复合材料层合板中，为了根据载荷要求调整层压板的厚度，常会发生削层。 本例演示复合板的削层建模。 所分析的面板具有对称的角铺设层，其中包括三个部分：厚部分、锥形部分和薄部分。 厚部分有 16 层，分为核心层、上下带层和下降层。 在厚部分的 16 层中，有 8 层以指定的交错距离逐渐下降到锥形部分。 具有正交各向异性材料属性的碳-环氧材料用作铺层材料。 具有各向同性材料属性的环氧材料用于下降层附近的袋中。 基于分层理论的方法以及堆叠区建模和可变厚 …

2001年1月1日 · In this paper, the influence of three most important design parameters, viz. number of plies dropped-off at a single station, distance between successive drop-offs (stagger distance) and lay-up of a dropped sublaminate, on the strength of the laminate has been studied.

2001年4月1日 · Laminates with plies dropped along more than one direction are of frequent occurrence in laminated structural components. These ply drops occur because of the termination of plies at certain planar locations, to obtain the desired thickness reduction or taper, giving rise to resin-rich areas called resin pockets.

Ply drop-offs should not be less than 20 to 1 in the load direction. i.e. if a single ply is .010 in thick the minimum drop-off spacing should be one ply every 0.2in. Skin ply drop-offs should not occur across the width of spars, ribs or frame flanges.

2015年1月30日 · 复合材料制件过渡区由铺层减层自然形成,但是过渡区减层截面形状有多种样式。试验件样式如图1示,试验件尺寸见图2。试验件过渡类型以及模型参数见表1。过渡类型A、B、C的过渡区减层示意图见图3。复合材料蒙皮减层前铺层顺序为, [45/-45/0/90/0/45/-45/90/-45/45/-45/0/45/- 图2试验件尺寸Fig2Thesizeoftestarticle. 收稿日期,2014-02-24;录用日期,2014-03-24. *通讯作者Tel:15850661361E-mail:rentianyu1989@163com.

2021年1月26日 · Finally, the optimization strategy revealed that the optimal drop-off location that minimizes the strain and maximizes the natural frequency is the ply drop-off located of the end plate.

composite structures with ply drops. The SST describes the sequence of ply-drops ensuring the transition between a thick guide laminate and a thinner one. A blended design is represented by a SST combined with a thickness distribution over the regions of the structure. An evolutionary algorithm is specialized for SST-based blending optimization.

Ply drop means the resin rich regions created due to abrupt ending of individual plies within the set of plies. This research is focused on understanding and quantifying the effect of these ply drop regions on the mechanical performance of the aerospace composite structures.