玄武岩纤维混凝土的动态力学性能  

Dynamic mechanical properties of basalt fiber reinforced concrete using a split Hopkinson pressure bar

作　　者：李为民[1] 许金余[1] 沈刘军[1] 李庆[1] 

机构地区：[1]空军工程大学工程学院机场建筑工程系,西安710038

出　　处：《复合材料学报》2008年第2期135-142,共8页Acta Materiae Compositae Sinica

基　　金：空军工程大学工程学院优秀博士学位论文创新基金(BC07002)

摘　　要：采用Φ100 mm分离式霍普金森压杆（SHPB）试验装置研究了不同纤维体积掺量的玄武岩纤维混凝土在不同应变率下的冲击压缩力学性能,并对试验的有效性进行了分析。结果表明：玄武岩纤维混凝土的动态强度增长因子与平均应变率的对数近似呈线性关系,强度与变形能力随平均应变率的提高而线性增加,体现了很强的应变率相关性;纤维体积掺量为0.1%的玄武岩纤维混凝土较素混凝土的动态抗压强度提高了26%,变形能力提高了14%;纤维体积掺量分别为0.2%、0.3%的玄武岩纤维混凝土的动态抗压强度比素混凝土高出25%左右,而变形能力较素混凝土无明显优势;在玄武岩纤维混凝土的SHPB试验中,试件破坏时刻为123.3-239.45μs,近似恒应变率加载时间比例约为62%,且应变率曲线的波动范围控制在23%左右,能够较好地满足应力均匀分布及恒应变率加载要求,表明SHPB试验结果可靠。The dynamic mechanical properties of the concrete reinforced with various volume fractions of basalt fiber subjected to high strain rates were studied using split Hopkinson pressure bar （SHPB） apparatus, and the validity of experiment was analyzed. The tests reveal that the dynamic strength and toughness of basalt fiber reinforced concrete （BFRC） are strain rate dependent, the strain rate effect can be expressed by linear approximations, and the relationship between dynamic strength increase factor and logarithm of average strain rate is approximately linear. The addition of 0. 1 % （volume fraction） basalt fiber results in 26 % and 14 %increase of impact compressive strength and toughness, respectively. The addition of 0.2 % and 0.3 % basalt fiber results in 25 % increase of impact compressive strength and no significant superiority in toughness to plain concrete. During SHPB tests, BFRC specimens begin to fail at 123.3-239.45 μs, nearly constant strain rates are obtained over 62 of test durations, and the average relative error of the strain rate is 23 %, so the SHPB test results of BFRC are credible.

关 键 词：玄武岩纤维混凝土 SHPB试验装置 波形整形技术 应变率 冲击压缩 动态力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程] TB330.1