缝合泡沫夹芯材料的冲击后压缩性能

Compression Properties After Impact of Stitched Foam Sandwich Structure

利用VARTM制备技术制备缝合/未缝合泡沫夹芯材料,分别在4组不同冲击能量下进行冲击试验及冲击后压缩试验,利用超声c检测技术对冲击后纤维面板内部的不可见损伤进行探测,发现缝合树脂柱的加入可以有效提高复合结构的抗冲击性能,其中冲击最大载荷的提升幅度达到20%~50%,此时,通过超声c检测发现纤维面板内部已经发生了较多的基体开裂,但分层破坏及纤维断裂情况有明显的减少,另外冲击后剩余压缩强度的提高也达到了35%~40%,同时发现相较于15 mm×15 mm的缝合密度,10 mm×10 mm的缝合密度具有更好的抗冲击性能。

The stitched/unstitched foam core material was prepared by VARTM technology,and the impact test and the post-impact compression test were carried out under four different impact energies,respectively.The invisible damage inside the fiber panel was detected by ultrasonic c detection technology.The addition of the columns can effectively improve the impact resistance of the composite structure,wherein the maximum load impact is increased by 20%~50%because with the addition of column,more matrix cracking occurs inside,but the delamination damage and fiber breakage are reduced.And the residual compression strength after impact is also increased by 35%~40%.In addition,it is found that compared with a stitching density of 15 mm×15 mm,a stitching density of 10 mm×10 mm has a better impact resistance.