摘要
设计并加工了气囊法成型复合材料圆管的不锈钢模具,并利用硅橡胶圆管作为加压气囊,制备了不同工艺间隙条件下的碳纤维复合材料圆管。利用金相显微镜观察了圆管横截面的微观形貌,对圆管的压缩性能进行了测试,并与同种材料和固化制度条件下热压罐成型平板的压缩强度进行了比较。结果表明,工艺间隙与圆管设计壁厚比值为34%时,圆管的成型质量最好,管壁的单层厚度相对较小且比较均匀,管壁内部缺陷较少,压缩强度为634MPa,与热压罐成型平板的压缩强度647MPa相当;工艺间隙增大后,成型质量逐步变差,压缩强度逐步下降,工艺间隙比值为86.7%时,出现了明显的分层和孔隙缺陷,且单层厚度明显偏大且不均匀,圆管的压缩强度下降到427MPa,相比最高值下降34%左右;工艺间隙减小后,成型质量和压缩强度也出现减小的趋势,但减小幅度相对不大。
This article introduces the design and produce process of stainless mold for composite tubes made by inflatable bladder by using silicone circular tubes as the bladder for pressure. Meanwhile,different carbon composite circular tube under different designed process gaps were fabricated. The micro appearance of the circular tubes section was observed by metalloscope. The compressive properties of the circular tubes were tested,and the mechanical properties results were compared with the plate by the autoclave,which were molding with the same materials and the curing cycle. The results show that,under such forming process,the quality of this product is best. When the ratio of the process gap and the designed thickness of the circular tubes is 34%,the monolayer thickness is relatively lower and uniform,and there are few defects in the tube wall inner. The compressive strength is 634 MPa which is equivalent to the one made by autoclave molding with a compressive strength of 647 MPa. The forming quality and the compressive strength were reduced with the increase of the process gap. Significantly delamination,porosity and defects were shown when the process gap ratio is 86. 7%. Meanwhile,the monolayer thickness became larger and uneven. The compressive strength is 427 MPa,which was reduced by 34% compared with the highest value. Forming properties and compressive strength will show the decreased trend when the process gap was reduced,however,it is not significant.
出处
《玻璃钢／复合材料》
CAS
CSCD
北大核心
2016年第8期87-91,共5页
Fiber Reinforced Plastics/Composites
关键词
复合材料
碳纤维
气囊法
圆管
工艺间隙
composites
carbon fiber
inflatable bladder molding
circular tube
process gap
