An Increase of Burst Strength and Damage Detection of CFRP Pressure Vessels Reinforced with SMA Fibers

本研究于2001年4月至2003年3月进行，目的是提高SMA纤维增强CFRP压力容器的爆破强度，并建立一种简便的容器损伤检测方法。通过本研究，取得了以下主要研究成果.为了研究SMA纤维记忆压缩应变的效果，在内部压力下对各向同性铝管进行了测试。SMA纤维增强铝管的破坏应变比无SMA纤维增强铝管的破坏应变大66%，说明SMA纤维对铝管的爆破应变和强度有提高作用.在CFRP管的情况下，SMA纤维对其爆裂强度的影响也得到了证实，但爆裂强度的增加取决于CFRP和SMA纤维的取向角。结果表明，SMA纤维增强CFRP管的最大抗爆强度存在一定的最佳角度.对碳纤维复合材料压力容器进行了加固， 关于我们 SMA纤维在其相变温度范围内记忆压缩应变。压力容器的应变值小于无SMA纤维压力容器的应变值，也小于有SMA纤维压力容器的应变值.直径为1.0mm的SMA纤维性能优于直径为0.5mm的SMA纤维。直径为1.0mm的SMA纤维增强CFRP容器的最大内压比未加SMA纤维的容器的最大内压提高了25.5%。这一结果意味着本研究的主要目的5。建立了有限元分析模型，有限元分析结果与试验结果吻合较好。该有限元分析方法可用于SMA纤维增强CFRP压力容器设计中CFRP和SMA纤维的最佳取向角的寻找，以及SMA纤维增强CFRP压力容器内部损伤的检测，其结果已作为特邀报告在韩国复合材料学会2002年春季会议上发表，并在国内学术会议上发表减

This research was executed from April, 2001 to March, 2003 in order to increase a burst strength CFRP pressure vessels reinforced with SMA fibers and to establish a convenient method of damage detection in the vessels. Through this study, the main research results were obtained as follows.1. In order to examine an effect of SMA fibers memorized compressive strain, an isotropic aluminum tube was tested under an internal pressure. The failure strain on the aluminum tube reinforced with SMA fibers was 66% larger than one without SMA fibers and this result showed the effect of SMA fibers on an increase of the burst strain and strength in the aluminum pipe.2. In a case of CFRP pipes, the effect of SMA fibers on their burst strength was also confirmed but the increase of burst strength depends on the orientation angles of CFRP and SMA fibers. As a result, some optimum angles give the maximum burst strength of CFRP pipes reinforced with SMA fibers.3. The CFRP pressure vessel was reinforced wi … More th SMA fibers which were memorized compressive strain over their temperature of transformation. Its strains of the pressure vessels was smaller than one of the pressure vessels without the SMA fibers and than one of vessels with SMA fibers not using memorized compressive strain.4. The performance of 1.0mm diameter of SMA fibers was better than one of 0.5mm diameter. The maximum internal pressure of CFRP vessel which was reinforced with 1.0 mm diameter of SMA fibers memorized compressive strain showed an increase of 25.5 % compared with one of vessel without SMA fibers. This result means a primary object of this research5. The FEM analysis was formulated and the result obtained by the FEM agreed with the experimental result. This FEM analysis is able to use for searching the optimum orientation angles of CFRP and SMA fibers in design of CFRP pressure vessels reinforced with SMA fibers and for detecting internal damage in the CFRP pressure vessels reinforced with SMA fibers.These results were presented as an invited lecture in the 2002 spring conference of the Korean Society for Composite Materials and were also presented in the conferences of domestic academic societies Less