钢纤维对水泥基复合材料抗起裂特性的影响
发布时间：2018-09-16 20:20
【摘要】：通过不同钢纤维体积分数及不同试件尺寸的预制缺口三点弯曲梁断裂试验,研究了普通乱向及定向钢纤维增强水泥基复合材料的抗起裂特性。利用试验测得的荷载-裂缝口张开位移曲线,分析了钢纤维对水泥基复合材料断裂性能的影响,并基于线性相关系数陡降法计算了起裂韧度。结果表明,定向钢纤维增强水泥基复合材料的起裂韧度明显高于普通乱向钢纤维增强水泥基复合材料;起裂韧度随钢纤维体积分数的增加而逐渐增大,当钢纤维体积分数达到0.9%左右时,定向钢纤维增强水泥基复合材料的起裂韧度值趋于稳定;在本试件高度范围内(40~100mm),起裂韧度随试件尺寸增加而逐渐增大,且定向钢纤维增强水泥基复合材料的增长趋势较为平缓。此外,从裂缝尖端夹杂改变其应力强度因子的角度解释了钢纤维的掺入及定向对起裂韧度的提高作用。
[Abstract]:Based on the fracture tests of prefabricated three-point bending beams with different volume fraction of steel fiber and different specimen sizes, the crack initiation characteristics of conventional disoriented and oriented steel fiber reinforced cement matrix composites were studied. Based on the load-crack opening displacement curve measured by experiments, the influence of steel fiber on the fracture properties of cement matrix composites was analyzed, and the fracture initiation toughness was calculated based on the linear correlation coefficient steep drop method. The results show that the fracture initiation toughness of oriented steel fiber reinforced cement matrix composites is obviously higher than that of conventional random steel fiber reinforced cement matrix composites, and the initial fracture toughness increases with the increase of steel fiber volume fraction. When the volume fraction of steel fiber reaches about 0.9%, the fracture initiation toughness of oriented steel fiber reinforced cement matrix composites tends to be stable, and the initial fracture toughness increases with the increase of specimen size (40~100mm). The growth trend of oriented steel fiber reinforced cement matrix composites is relatively smooth. In addition, from the angle of changing the stress intensity factor of crack tip inclusions, the effect of steel fiber incorporation and orientation on improving fracture initiation toughness is explained.
【作者单位】： 河北工业大学土木与交通学院;
【基金】：国家自然科学基金(51578208;51309073) 河北省高等学校科学技术研究重点项目(ZD2015028) 河北省自然科学基金(E2017202030)
【分类号】：TB332
本文编号：2244685
[Abstract]:Based on the fracture tests of prefabricated three-point bending beams with different volume fraction of steel fiber and different specimen sizes, the crack initiation characteristics of conventional disoriented and oriented steel fiber reinforced cement matrix composites were studied. Based on the load-crack opening displacement curve measured by experiments, the influence of steel fiber on the fracture properties of cement matrix composites was analyzed, and the fracture initiation toughness was calculated based on the linear correlation coefficient steep drop method. The results show that the fracture initiation toughness of oriented steel fiber reinforced cement matrix composites is obviously higher than that of conventional random steel fiber reinforced cement matrix composites, and the initial fracture toughness increases with the increase of steel fiber volume fraction. When the volume fraction of steel fiber reaches about 0.9%, the fracture initiation toughness of oriented steel fiber reinforced cement matrix composites tends to be stable, and the initial fracture toughness increases with the increase of specimen size (40~100mm). The growth trend of oriented steel fiber reinforced cement matrix composites is relatively smooth. In addition, from the angle of changing the stress intensity factor of crack tip inclusions, the effect of steel fiber incorporation and orientation on improving fracture initiation toughness is explained.
【作者单位】： 河北工业大学土木与交通学院;
【基金】：国家自然科学基金(51578208;51309073) 河北省高等学校科学技术研究重点项目(ZD2015028) 河北省自然科学基金(E2017202030)
【分类号】：TB332
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