碳纤维复材加固钢管的抗内爆性能

Anti-implosion Performances of Steel Pipes Strengthened with CFRP Sheets

为研究内爆荷载下碳纤维复材(Carbon Fiber Reinforced Plastic,CFRP)加固输油气钢管的受力性能,开展了8根CFRP加固钢管试件的内爆试验。试验中考虑了乳化炸药质量及碳纤维布层数的变化对加固钢管抗内爆性能及最终破坏模式的影响。结果表明:设置相同碳纤维布层数的试件,其管身轴向裂纹随乳化炸药量的增加而增长;同时,该类试件的CFRP加固层随乳化炸药量的增加由开裂剥离失效逐渐演化为碎片化剥离破坏;此外,随碳纤维布层数的增加,相同炸药量导致的钢管轴向裂纹扩展长度逐渐缩小,进而转变为环向扩展,表现出良好的限爆效果。最后,通过对CFRP加固钢管的受力分析,提出内爆荷载下的钢管管壁受力计算模型。

To study the anti-implosion performance of steel pipes strengthened with carbon fiber reinforced plastic(CFRP)sheets,a total of 8 specimens were tested under implosion impact.The weight of emulsion explosive and the number of CFRP sheets for strengthening were taken into account in the experiments.The experimental results demonstrated that,for specimens strengthened with the same number of CFRP sheets,the axial cracks on the pipe wall increased with the increase of the emulsion explosive weight.Besides,for these specimens,the CFRP layer failed from cracking failure to fragmentation failure with the increase of the emulsion explosive weight.Additionally,for specimens with the same emulsion explosive weight,the cracks on the pipe wall developed marginally in the axial direction,and then developed in the hoop direction,which demonstrated the anti-implosion effect of the strengthened CFRP layer.Finally,by conducting the mechanical analysis,a theoretical model was proposed for analyzing CFRP strengthened steel pipes under implosion impact.