杨惠贤, 黄炎生, 李静. 纤维增强水泥基复合材料的动力拉伸性能研究[J]. 工程力学, 2016, 33(7): 144-150. DOI: 10.6052/j.issn.1000-4750.2014.11.0997
引用本文: 杨惠贤, 黄炎生, 李静. 纤维增强水泥基复合材料的动力拉伸性能研究[J]. 工程力学, 2016, 33(7): 144-150. DOI: 10.6052/j.issn.1000-4750.2014.11.0997
YANG Hui-xian, HUANG Yan-sheng, LI Jing. STUDY ON DYNAMIC TENSILE BEHAVIORS OF FIBER REINFORCED CEMENTITIOUS COMPOSITES[J]. Engineering Mechanics, 2016, 33(7): 144-150. DOI: 10.6052/j.issn.1000-4750.2014.11.0997
Citation: YANG Hui-xian, HUANG Yan-sheng, LI Jing. STUDY ON DYNAMIC TENSILE BEHAVIORS OF FIBER REINFORCED CEMENTITIOUS COMPOSITES[J]. Engineering Mechanics, 2016, 33(7): 144-150. DOI: 10.6052/j.issn.1000-4750.2014.11.0997

纤维增强水泥基复合材料的动力拉伸性能研究

STUDY ON DYNAMIC TENSILE BEHAVIORS OF FIBER REINFORCED CEMENTITIOUS COMPOSITES

  • 摘要: 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。

     

    Abstract: The dynamic splitting tests with four different strain rates for hybrid fiber (Steel and polyvinyl alcohol (PVA) fiber) reinforced cementitious composites (HFRCC), PVA fiber reinforced cementitious composites (PRCC) and cementitious composites (CC) were conducted using the Split Hopkinson Pressure Bar (SHPB). The dynamic splitting tensile strength, energy properties and the failure modes were analyzed. The results show that HFRCC, PRCC and CC are sensitive to the strain rate, the dynamic splitting tensile strength and energy properties increase with the increasing of strain rate. The splitting strength of HFRCC and the PRCC is 34% and 20% higher than that of CC, respectively. The energy absorption is more sensitive to the strain rate due to PVA fibers. When the content of steel fiber is 25% of all the fibers, the energy absorption of HFRCC is 5% lower than that of PRCC, while as the content increases to 62.5%, the energy absorption is much greater than that of PRCC. Consequently, HFRCC is a better material for the balance of the dynamic splitting tensile strength and energy properties to resist impact loading.

     

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