低速侧向冲击下钢丝-CFRP复合杆的力学性能

Mechanical properties of steel wire CFRP composite rod under low-speed lateral impact

针对传统CFRP杆横向抗冲击性能较差的问题,对4种不同钢丝体积含量和防护类型的钢丝-CFRP复合杆进行了摆锤冲击试验,并采用扫描电镜分析了其损伤形貌特征.结果表明:通过在CFRP杆中复合高强钢丝,可以显著提高杆材的横向抗冲击性能,其冲击吸收功与钢丝体积含量呈正相关,相较于CFRP杆,钢丝体积含量为30.3%的钢丝-CFRP复合杆的平均吸收功提高了41.97%;增加PVC套管的壁厚和内径能够明显提高钢丝-CFRP复合杆的抗冲击性能;钢丝-CFRP复合杆损伤形态为碳纤维因锤头冲击作用产生挤压损伤,形成许多较短的纤维,钢丝部分发生弯折变形但并未完全断裂,钢丝部分弯折变形可能吸收了部分冲击能量.

In the report,aimed at improving the poor performance of transverse impact resistance of carbon fiber reinforced polymer(CFRP)rod,the pendulum impact tests were conducted on four different steel wire volume contents and protection types of steel wire CFRP composite rods,the scanning electron micros-copy was used to analyze their damage morphology characteristics.The results showed that the transverse impact resistance ability can be notably improved by embedding the high strength steel wire into the CFRP rod to form the composite rod,and the absorbed energy of the rod linearly increase with the volume ratio of steel wire,the average absorbed energy is improved by 41.97%with the steel wire volume ratio of 30.3%compared to the conventional CFRP rod.The transverse impact resistance ability of composite rod can be obviously improved by the wall thickness and inner radius of polyvinyl chloride(PVC)protection pipe tube.The damage form of the steel wire CFRP composite rod is compression damage,and which is caused by the impact of the hammer on the carbon fiber,many shorter fibers are formed,the steel wire undergoes bending deformation,however,which is not completely broken.The bending deformation of the steel wire may absorb some impact energy.