CAJ | 학술논문

采用变截面霍普金森杆（ SHPB）对不同配比的钢／PVA纤维混合增强水泥基复合材料（ HFRCC ）进行了不同应变率的冲击压缩实验，并对其抗压强度、峰值应变和韧性等动力性能进行对比分析。结果表明：HFRCC材料表现出应变率敏感性；随着PVA纤维的增加，材料的变形性能更好，而钢纤维的加入则提高了其动态抗压强度；PVA纤维含量的增加能降低材料的动态强度增长因子；在低应变率下和峰值应力之前，纤维间的相对含量对HFRCC的韧性影响不大，在高应变率下，钢纤维能有效提高其韧性。
채용변절면곽보금삼간（ SHPB）대불동배비적강／PVA섬유혼합증강수니기복합재료（ HFRCC ）진행료불동응변솔적충격압축실험，병대기항압강도、봉치응변화인성등동력성능진행대비분석。결과표명：HFRCC재료표현출응변솔민감성；수착PVA섬유적증가，재료적변형성능경호，이강섬유적가입칙제고료기동태항압강도；PVA섬유함량적증가능강저재료적동태강도증장인자；재저응변솔하화봉치응력지전，섬유간적상대함량대HFRCC적인성영향불대，재고응변솔하，강섬유능유효제고기인성。
The impact compression tests of hybrid fiber ( steel and polyvinyl alcohol ( PVA) fiber)-reinforced ce-ment-based composites (HFRCC) of different ratios were conducted at different strain rates by using a split Hopkin-son pressure bar ( SHPB) .Then, their dynamic compressive strength , peak strain and tenacity are compared .The results show that (1) HFRCC is sensitive to strain rates;(2) the peak strain increases with the PVA fiber content and the addition of steel fiber can increase the dynamic compressive strength;(3) to increase the PVA fiber con-tent can decrease the dynamic strength increase factor;and (4) at a low strain rate and before the stress reaches up to a peak, the relative contents of two kinds of fibers have little influence on the tenacity of HFRCC .At a high strain rate , however , the steel fiber can effectively improve the tenacity of HFRCC .