论文部分内容阅读
首先通过挤压成型技术制备出宽厚比为12.5的聚乙烯醇(PVA)短纤维增强地聚合物基复合材料薄板(SFRGC),然后利用Radmana冲击试验机系统研究了不同纤维体积分数和粉煤灰掺量的SFRGC在高速冲击载荷作用下的力学响应行为。通过激光粒度仪(LSA)、X射线衍射(XRD)、扫描电镜(SEM)等微观测试手段分析了SFRGC的微观结构和冲击破坏机制,结果表明,PVA短纤维的加入改变了地聚合物的冲击破坏模式:由脆性破坏变为延性破坏;对于不掺或掺加少量粉煤灰(≤10 wt%)的地聚合物基复合材料冲击强度高、韧性大,然而当大量粉煤灰(≥30 wt%)加入后,地聚合物基复合材料的冲击强度和韧性显著下降。另外,对SFRGC在20次冻融和1个月硫酸侵蚀作用后的冲击响应进行了研究,探讨了SFRGC在严酷环境条件下的耐久性能。
Firstly, polyvinyl alcohol (PVA) staple fiber reinforced polymer-based composite sheet (SFRGC) with aspect ratio of 12.5 was prepared by extrusion molding technology. Then the effects of different fiber volume fraction and fly ash Mechanical Response Behavior of SFRGC at High Speed Impact Load. The microstructure and impact failure mechanism of SFRGC were analyzed by means of laser particle size analyzer (LSA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the addition of PVA short fiber changed the impact of geopolymer Failure mode: from brittle failure to ductile damage; without adding or mixing a small amount of fly ash (≤ 10 wt%) of geopolymer matrix composite high impact strength, toughness, however, when a large amount of fly ash (≥ 30 wt%), the impact strength and toughness of geopolymer composites decreased significantly. In addition, the impact response of SFRGC after 20 freeze-thaw cycles and 1-month sulfuric acid attack was studied, and the durability of SFRGC under harsh environmental conditions was discussed.