基于SHPB试验的钢纤混凝土损伤研究

SHPB experimental damage investigation used for steel-fiber reinforced concrete

通过SHPB试验得到压杆中入射波与透射波应变随时间变化的时程曲线,求得在不同应变率条件下被测混凝土材料的应力与应变的关系,然后对混凝土的损伤因子采用Weibull函数,通过拟合得到了混凝土材料在冲击载荷下损伤因子的变化,确定了影响损伤因子变化的参数。对透射波的测量采用了半导体应变计技术,测量结果表明,半导体应变计技术可以较好的用在较弱的透射波测量。

The incident wave and transmission wave varying with the time have been obtained by SHPB experiment.The relationship curve for stress and strain of concrete material were also obtained.The Weibull function is used to describe the damage factor of the concrete.The damage factor of the concrete changing with the time under the impact conditions is obtained by the method of fitting the strain-stress relationship curves. The semiconductor strain gauges can be used to get the vivid signals of the weak transmission strain-pulse.