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采用分离式霍普金森杆对聚乙烯醇(PVA)纤维增强水泥基复合材料(PRCC)、基体材料、不同相对掺量的钢纤维和PVA纤维混合增强水泥基复合材料(HFRCC)进行了四种不同应变率下的动态劈拉试验,通过对材料的劈拉强度、能量吸收和破坏形态等方面的对比分析,探讨了三种材料的动力拉伸性能,结果表明材料表现出应变率敏感性,随着应变率的提高,动态劈拉强度和能量吸收能力相应增加。HFRCC对基体材料的劈拉强度提高可达到34%,而PRCC材料提高约20%。PVA纤维对材料的耗能能力的影响比钢纤维具有更强的应变率敏感性。钢纤维掺量占总纤维掺量25%的HFRCC材料耗能能力比PRCC略低5%,而钢纤维掺量达到总纤维掺量的62.5%时,HFRCC材料的耗能能力比PRCC的耗能能力显著提高。HFRCC在动态劈拉强度和能量吸收能力方面更加均衡,具有更好抵抗冲击的能力。
Four types of hybrid fiber reinforced cement-based composites (HFRCC) were obtained from split Hopkinson bar (PVA) fiber reinforced cementitious matrix composites (PRCC), matrix materials, steel fibers with different relative contents and PVA fiber. Dynamic splitting tests at different strain rates were conducted to investigate the dynamic tensile properties of the three materials by comparing the splitting tensile strength, energy absorption and failure morphology of the materials. The results show that the materials exhibit strain rate sensitivity, As the strain rate increases, the dynamic splitting tensile strength and energy absorption capacity increase accordingly. The splitting tensile strength of HFRCC to the matrix material can be increased by 34%, while the PRCC material can be increased by about 20%. The influence of PVA fiber on the energy dissipation capacity of the material is more sensitive to strain rate than that of steel fiber. The energy dissipation capacity of HFRCC with steel fiber content of 25% of the total fiber content is slightly lower than PRCC by 5%. When the steel fiber content reaches 62.5% of the total fiber content, the energy dissipation capacity of HFRCC material is lower than that of PRCC Ability to significantly improve. HFRCC is more balanced in terms of dynamic splitting tensile strength and energy absorption capacity, and has better resistance to impact.