Bale Jefri, Boimau Kristomus, Nenobesi Marselinus
Mechanical Engineering Department, Universitas Nusa Cendana, Kupang, Nusa Tenggara Timur, Indonesia.
Int J Biomater. 2017;2017:7685047. doi: 10.1155/2017/7685047. Epub 2017 Dec 24.
A research has been conducted in the present study to investigate the effect of hole configuration on tensile strength of lontar fiber-reinforced composites. The lontar fiber-reinforced composites used in this study were produced by hand lay-up process. The lontar fiber-reinforced composites consist of short random fiber of 5 cm that contains 32% of nominal fiber volume as the reinforcement and unsaturated polyester as the matrix. The results show that the differences of hole configuration have an effect on tensile strength of lontar fiber-reinforced composites. It is found that the specific area of four-hole specimens experiences smaller strain propagation due to the redistributed stress and no stress passes through the hole. The damage of lontar fiber-reinforced composites with different hole configurations in tension is fairly straight and transverse to the loading axis, where the initial damage occurs in the form of matrix cracking, propagates into interfacial failure in form of delamination, and ultimately failed mainly due to the fiber breakage.
本研究开展了一项调查，以探究孔洞形态对龙脑纤维增强复合材料拉伸强度的影响。本研究中使用的龙脑纤维增强复合材料是通过手工铺层工艺制备的。龙脑纤维增强复合材料由长度为5厘米的短随机纤维组成，其中标称纤维体积含量为32%作为增强材料，不饱和聚酯作为基体。结果表明，孔洞形态的差异对龙脑纤维增强复合材料的拉伸强度有影响。研究发现，四孔试样的比表面积因应力重新分布而经历较小的应变传播，且没有应力穿过孔洞。不同孔洞形态的龙脑纤维增强复合材料在拉伸时的损伤相当平直且垂直于加载轴，初始损伤以基体开裂的形式出现，发展为分层形式的界面失效，最终主要由于纤维断裂而失效。
