缝合复合材料可用性——简单层合板的基本性能

为了解决缝合复合材料在飞机结构中的应用问题,通过试验方法研究了缝合以及缝合方向对T300帘子布/QY9512单向层合板与正交对称层合板拉伸和压缩性能的影响,得到了T300帘子布/QY9512材料的部分基本性能常数.研究表明,缝合与缝合方向对这两种层合板的模量影响不大,但对单向层合板的泊松比影响较大,而且偏轴后缝合单向层合板的泊松比不满足偏轴转换关系.缝合及其方向对单向层合板的拉伸强度影响很大,而对压缩强度影响却不明显.缝合正交对称层合板中铺层的拉伸破坏机制与缝合单向层合板的破坏机制不同,因此不能用缝合单向层合板的拉伸强度作为正交层合板内铺层的强度极限.

Properties of stitched composite laminates--the principle properties of simple laminates

In order to solve the application of stitched composites in aircraft structures, experimental studies were carried out on the effect of stitching and stitching directions on tensile and compressive properties of unidirectional laminates and cross-ply symmetric laminates made of uniweave T300/QY9512. Some principle properties of uniweave T300/QY9512 were measured. It shows that stitching and stitching directions have little effect on the modulus of this two kind of laminates, while the effect is great on Possion ratio. The transform of off-axial modulus is not fit for Poisson ratio of off-axial stitched unidirectional laminates. Stitching and its directions have great effect on tensile strength of unidirectional laminates, but are not obvious on their compressive strength. Because the tension failure mechanisms of stitched cross-ply symmetric laminates are different from that of stitched unidirectional laminates, the strength of stitched unidirectional laminates cannot be used as the laminar strength of stitched cross-ply symmetric laminates.