硫酸盐环境下碳纤维增强复材片材拉伸性能试验研究

EXPERIMENTAL RESEARCH ON TENSILE PROPERTIES OF CFRP SHEETS IN SULFATE ENVIRONMENT

为了研究硫酸盐腐蚀对碳纤维增强复合材料(CFRP)片材力学性能的影响,对11组77个CFRP试件进行单向受拉试验。试验着重考虑硫酸盐浓度和腐蚀时间对CFRP片材受拉破坏特征及抗拉强度、弹性模量、伸长率等力学性能的影响。结果表明:1)硫酸盐干湿循环作用对CFRP片材的破坏过程及破坏特征几乎没有影响;2)腐蚀前后CFRP片材的应力-应变关系均为线弹性;3)CFRP片材抗拉强度和伸长率随着腐蚀时间的增加逐渐下降,并且硫酸盐浓度越高下降越显著;4)硫酸盐干湿循环作用对CFRP片材的弹性模量影响很小。通过对试验数据的分析,提出了考虑腐蚀时间的抗拉强度计算方法,通过计算值与试验值的对比分析可知,该计算方法能很好地反映硫酸盐干湿循环作用下CFRP片材抗拉强度的退化规律。

In order to study the effect of sulfate corrosion on the mechanical properties of CFRP(carbon fiber reinforced polymer)sheets,unidirectional tensile tests were carried out on 11 groups of 77 CFRP specimens.The effects of sulfate concentration and corrosion time on tensile failure characteristics,tensile strength,modulus of elasticity and elongation of CFRP sheets were considered.The results showed that:1)Sulfate dry-wet circulation has little effect on the failure process and failure characteristics of CFRP sheet;2)The stress-strain relationship of CFRP sheets before and after corrosion was linear elasticity;3)The tensile strength and elongation of CFRP sheets decreased with the increase of corrosion time,and the more significant the sulfate concentration was higher;4)Sulfate dry and wet cycle has little effect on the elastic modulus of CFRP sheet.Based on the analysis of the test data,the calculation method of tensile strength considering corrosion time was proposed.The calculated method could reflect the degradation law of tensile strength of CFRP sheet under the action of sulfate dry and wet cycle by comparing the calculated value with the experimental value.