ABSTRACT

Pipeline repair plays an important role in safe pipeline operation. Composite material repair technology has been widely used in pipeline repair due to its advantage of light weight and low cost. In this paper, the failure loads of repaired pipe with composite under tension and internal pressure are analysed by experiments, Finite Element Method (FEM) and theoretical method, and simple formula of failure loads is obtained based on theoretical analysis and verified by FEM and experiments. First, the tension experiment shows that debonding happens in the repaired pipe before its fracture, and then the debonding details are showed in FEM results considering the adhesive debonding criteria, finally a simple formula expression is obtained for the failure tension loads based on the analysis of interface stresses, and the results are almost consistent with the experimental method and FEM. Similarly, for the case under internal pressure, the blasting failure loads are obtained for the repaired pipe based on the theoretical analysis, which are consistent with FEM results.

摘要

管道维修对管道安全运行起着重要作用。复合材料修复技术由于具有重量轻、成本低的优点，在管道修复中得到了广泛的应用。本文通过实验、有限元法（FEM）和理论方法对修复后的复合管在拉力和内压下的破坏载荷进行了分析，在理论分析的基础上得到了破坏载荷的简单公式，并通过有限元和实验验证。 . 首先，拉伸实验表明修复后的管道在断裂前发生了剥离，然后在考虑粘合剂剥离准则的有限元结果中显示了剥离细节，最后在分析的基础上得到了破坏拉伸载荷的简单公式表达式界面应力，结果与实验方法和有限元法几乎一致。同样，对于内压情况下，根据理论分析得到修复后管道的爆破破坏载荷，与有限元分析结果一致。