碳纤维复合材料缠绕制品抗外压性能研究

研究了树脂基体模量、缠绕角和厚度对碳纤维复合材料缠绕制品抗外压性能的影响。实验结果表明:采用MNA共混PMDA固化环氧树脂并调整PMDA含量可以有效改变树脂模量,随着PMDA含量的增加,树脂模量提高。当PMDA含量仅为MNA的5%时,树脂模量从3.71 GPa增加到4.18 GPa,提高了13%;当PMDA含量为MNA的10%时,模量达到最大值,为4.61 GPa,提高了24%。随着基体模量增加,单向CFRP的压缩强度、剪切强度和环刚度均先增加后减少。当基体模量为4.18GPa时,CFRP的压缩强度和剪切强度均达到最大值,分别为655 MPa和71.6 MPa,提高了16%和12%。此时,缠绕管环刚度达到最大值,为277 k N/m~2,提高了87%;同时增加缠绕角和厚度能够提高缠绕管的抗失稳能力。

STUDY ON EXTERNAL PRESSURE PROPERTIES OF CARBON FIBER REINFORCED POLYMER WINDING PRODUCTS

The effects of the properties of the resin matrix modulus,winding angle and layer on the compressive properties of the carbon fiber composite winding products were studied.The results show that adjusting the content of PMDA in the MNA blending PMDA curing epoxy resin can effectively change the modulus of the cured resin.The resin modulus increases with the increase of the content of PMDA.When the content of PMDA was 5％ of MNA,the modulus increased from 3.71 GPa to 4.18 GPa,which increased by 13％.When the content of PMDA was 10％ of MNA,the modulus reached the maximum value of 4.61 GPa and increased by 24％.With the increase of matrix modulus,the compressive strength,shear strength and ring stiffness of unidirectional CFRP were increased at first and then decreased.When the matrix modulus was 4.18 GPa,the compressive strength and shear strength of CFRP reached the maximum value,which were 655 MPa and 71.6 MPa,and increased by 16％ and 12％,respectively.At this point,the ring stiffness of the winding pipe reaches the maximum value of 277 kN/m2and increases by 87％.At the same time,increasing the winding angle and thickness can improve the anti-buckling stability of the winding pipe.