碳纤维复材-钢复合板材单向拉伸力学性能试验研究

EXPERIMENTAL RESEARCH ON THE MECHANICAL PROPERTIES OF CFRP-STEEL COMPOSITE PLATES UNDER UNI-DIRECTIONAL TENSION

为研究纤维增强材料-钢复合板材的单向拉伸力学性能,对19组共57个碳纤维复材(CFRP)-钢复合板材试件进行单向受拉试验。试验考虑了碳纤维布层数、钢板厚度、碳纤维布布置形式及碳纤维布铺设角度的不同设置。试验结果表明:当碳纤维布平行于受拉方向布置时,纤维布层数、纤维布布置形式及钢板厚度的变化均不会影响试件的破坏过程及最终破坏形态,表现为钢板受拉屈服后CFRP层的受拉断裂破坏。随着碳纤维布铺设角度的增大,CFRP层与钢板的协同变形效应减弱,最终破坏形态变为CFRP层-钢板界面剥离破坏。最后,基于复合法则给出了FRP/钢复合板材宏观应力-应变关系理论模型。

In order to study the mechanical properties of FRP-steel composite plates, a total of nineteen groups, with the number of fifty-seven, of carbon fibre reinforced plastics ( CFRP )-steel specimens were tested under unidirectional tension. The variables involved in the experiments were the layers of fiber sheet, the thickness of steel plate, the layout of fiber sheet and the lay angle of fiber sheet. The experimental results demonstrated that the layers of carbon fiber sheet, the thickness of steel plate and the layout of carbon fiber sheet had little influence on the failure process and failure mode of CFRP-steel plate when carbon fiber sheets were placed parallel to the tension force. These specimens experienced an elastic to elastic-plastic deformation stage before CFRP layer rupture happened. With the increase of the lay angle of fiber sheets, the synergistic effect between CFRP layer and steel plate was weakened and the failure mode changed to CFRP layer debonding. At last, a stress-strain model for FRP-steel plate was proposed based on the stereology principle.