可折叠热塑性复合材料接头的力学性能  

Mechanical properties of foldable thermoplastic composite connector

作　　者：刘羽熙[1] 陈玉 刘少柱 荆祥海 LIU Yuxi;CHEN Yu;LIU Shaozhu;JING Xianghai(College of Materials and Chemical Engineering,Chuzhou University,Chuzhou 239000,Anhui,China;Lianyungang Jingwei Advanced Composite Material Co.,Ltd.,Lianyungang 222000,Jiangsu,China;Pipe China North Pipeline Company,Langfang 065000,Hebei,China)

机构地区：[1]滁州学院材料与化学工程学院,安徽滁州239000 [2]连云港经纬复合新材料有限公司,江苏连云港222000 [3]国家管网集团北方管道有限责任公司,河北廊坊065000

出　　处：《材料工程》2024年第11期41-49,共9页Journal of Materials Engineering

基　　金：特种环境复合材料技术国防科技重点实验室开放基金(6142905213114);安徽省重点研究与开发计划项目(S202104b11020018);安徽省高校优秀青年人才支持计划一般项目(gxyq2022099)。

摘　　要：开发了一种芳纶纤维增强热塑性树脂复合材料接头,用于海洋管道非开挖穿插修复内衬管的连接。静液压爆破测试结果表明内压作用下的失效模式是管体本身纤维发生断裂,接头处保持完好;拉伸测试结果表明接头拉伸强度高于内衬管本体强度,满足穿插施工要求。分别建立复合材料接头的内压、拉伸和折叠展开分析模型,通过有限元分析预测了内衬管及接头的极限强度、应力应变分布和变化趋势。有限元结果显示内压作用下主要承载结构为环向纤维,最大应变发生在接头与内衬管本体交接的位置。拉伸作用下主要承载结构为轴向纤维,外层热塑性聚氨酯边缘位置由于应力集中导致应变较大,但仍在材料极限弹性应变范围内。折叠展开大变形过程中,最大应变发生在折叠阶段,接头应变与内衬管本体应变相近。研发的管体中间接头制造方便,尺寸与内衬管匹配性好,可以进行连续盘卷、折叠,满足海底管道一次性长距离修复的要求。An aramid fiber reinforced thermoplastic resin composite connector was developed for the connection of trenchless penetration repair lining pipe of ocean pipeline.The results of the hydrostatic burst test show that the failure mode under internal pressure is that the fiber of the pipe itself breaks and the connector remains intact.The tensile test results show that the tensile strength of the connector is higher than that of the lining pipe body,which meets the requirements of penetration construction.The internal pressure,tensile and folding models of the composite connector were established,and the ultimate strength,stress and strain distribution,and variation trend of the lining pipe and connector were predicted by finite element analysis.The finite element results show that the main bearing structure under internal pressure is the toroidal fiber,and the maximum strain occurs at the junction of the connector and the lining pipe body.The main load-bearing structure under tensile action is axial fiber,and the outer thermoplastic polyurethane edge has a large strain due to stress concentration,but it is still within the limit elastic strain range of the material.During the large deformation process of folding and unfolding,the maximum strain occurs in the folding stage,and the intermediate connector strain is close to the strain at lining pipe body.The intermediate connector of the pipe body developed in this study is convenient to manufacture,exhibits a high degree of compatibility with the lining pipe,and can be continuously coiled and folded,meeting the requirements of one-time long-distance repair of submarine pipelines.

关 键 词：可折叠复合材料接头 非开挖穿插 非线性有限元分析 折叠和展开 

分 类 号：TB332[一般工业技术—材料科学与工程]