激波作用下碳纤维混凝土的压敏性试验研究

对圆柱形碳纤维混凝土试样,在激波管上进行了冲击作用试验,研究试样在激波作用下的压敏性。试验结果表明,相比60 mm长的试样,电容更大的40 mm长试样在激波作用下其电阻变化的初始阶段出现了暂态效应,验证了试样电容决定暂态效应的严重程度,并且荷载的大小对暂态效应也有影响。在激波阶跃压力持续时间段,两种长度尺寸的试样的电阻变化均出现相应的稳定平台。在相同压力作用下,长度较大的试样电阻变化更大。试样的电阻变化能较好地反映试样的受载情况。

Experimental Study of the Compression Sensibility of Carbon Fiber Concrete under Shock Wave

In order to study the compression sensibility of carbon fiber concrete under shock wave, the impact tests of cylindrical carbon fiber concrete specimens were carried out in shock tube. The results of shock tube experiment show that in comparison with the specimen of 60mm in length, the specimen of 40mm in length with larger capacitance has transient effect during the initial stage of resistance change under shock wave, which indicates the magnitude of transient effect is determined by the capacitance of the specimen, and the magnitude of the impact loading also has an effect on the transient effect. That similar stabilization stage in resistance change of specimens has appeared, while the shock wave is in the step pressure interval time. Under the same pressure, the resistance change of the specimen with larger length is bigger. The resistance change of carbon fiber concrete can better reflect the impact loading.