为研究 2 层不同角度碳纤维增强复合材料(Carbon Fiber Reinforced Polymer/Plastic,CFRP)加固柏木的受压裂纹演化规律,对分别粘贴2 层30°、60°、90° CFRP的柏木进行单轴压缩试验,利用声发射(Acoustic Emission,AE)技术和数字图像相关(Digital Image Correlation,DIC)技术对试件的裂纹演化过程进行监测,最后结合数值模拟对试件的荷载位移曲线进行验证并提供加固木材的方法指导.结果表明,声发射信号可以反映试件裂纹的萌生规律及力学特性,CFRP 包裹角度越大,试件裂纹扩展越平缓,延性越高,最大承载力越高;RA-AF分析法和DIC表面云图的结合可以反映试件裂纹类型、萌生的位置及扩展过程,试件的裂纹均以张拉型裂纹为主,且CFRP包裹角度越大,裂纹就越容易在端部产生;AE技术、RA-AF分析法、DIC技术和数值模拟的结合为进一步研究CFRP包裹角度与裂纹演化规律的影响关系提供参考.
In order to study the evolution law of compressive cracks in two layers of CFRP reinforced cypress with different angles,uniaxial compression experiments were conducted on cypress wood with two layers of 30°,60°,and 90° CFRP,respectively.Acoustic Emission(AE)technology and Digital Image Correlation(DIC)technology were used to monitor the crack evolution process of the specimens.Finally,numerical simulation was used to verify the load displacement curve of the specimens and provide guidance on strengthening the wood.The results showed that the acoustic emission signal can reflect the initiation law and mechanical characteristics of cracks in the specimen.The larger the CFRP wrapping angle,the smoother the crack propagation,the higher the ductility and the higher the maximum bearing capacity.The combination of RA-AF analysis method and DIC surface cloud map can reflect the type of crack,location of initiation,and propagation process of the specimen.The cracks in the specimen were mainly tensile type cracks,and the larger the CFRP wrapping angle,the easier it was for cracks to occur at the end.The combination of AE technology,RA-AF anal-ysis method,DIC technology,and numerical simulation provides a reference for further studying the relationship between the wrapping angle of CFRP and the crack evolution law.