自动铺丝末端缺陷角度对层合板拉伸性能的影响

自动纤维铺放(AFP)工艺能够有效制造大型复合材料构件,但在铺放过程中因为丝束末端等断面而出现不同角度内嵌缺陷。为解决相关问题,按照[(90°/0°)5/90°]和[(0°/90°)5/0°]的铺层顺序,在0°和90°铺层内分别设置不同丝束末端角度的孔隙缺陷或重叠缺陷。结果表明:不同角度纤维铺层内嵌不同角度缺陷时,导致复合材料构件差异明显。在90°纤维铺层方向上,内嵌90°孔隙缺陷和90°重叠缺陷时,试件拉伸强度最高,拉伸强度比分别为90. 89%和90. 11%。在0°纤维铺层方向上,内嵌±30°孔隙缺陷和30°重叠缺陷时,试件拉伸强度最高,拉伸强度比分别为28. 48%和50. 71%。

Influence of Defect Angle at the End of Tows on the Tensile Properties of Laminates by Automated Placement

Automatic fiber placement (AFP) technology could manufacture large composite components effectively,but there are different angle embedded defects due to the same cross-section at the end of the tow in the process of placement.In order to solve the related problems,according to the laying sequence of [(90°/0°)₅/90°] and [(0°/90°)₅/0°],the gap defects or overlapping defects with different end angles of the tow were set in the 0° and 90° laying sequence respectively.The experimental results show that the difference of the composite components is obvious when the defects are embedded in different angles.In the direction of 90° fiber layer,when 90° void defect and 90° overlapping defect are embedded, the tensile strength of the specimen is the highest,and the tensile strength ratio is 90.89% and 90.11%,respectively.In the direction of 0° fiber layer,the tensile strength of the specimen is the highest when embedded with ± 30° gap defect and 30° overlapping defect,and the tensile strength ratio is 28.48% and 50.71% respectively.