Guilpin Antoine, Franciere Geoffrey, Barton Lewis, Blacklock Matthew, Birkett Martin
ENSIAME, Université de Valenciennes et du Hainaut-Cambrésis, Le Mont-Houy, 59313 Valenciennes CEDEX 9, France.
Rosen Group, Quorum Business Park, Newcastle upon Tyne NE12 8BS, UK.
Polymers (Basel). 2019 Sep 19;11(9):1531. doi: 10.3390/polym11091531.
Adhesive bonding of polyethylene gas pipelines is receiving increasing attention as a replacement for traditional electrofusion welding due to its potential to produce rapid and low-cost joints with structural integrity and pressure tight sealing. In this paper a mode-dependent cohesive zone model for the simulation of adhesively bonded medium density polyethylene (MDPE) pipeline joints is directly determined by following three consecutive steps. Firstly, the bulk stress-strain response of the MDPE adherend was obtained via tensile testing to provide a multi-linear numerical approximation to simulate the plastic deformation of the material. Secondly, the mechanical responses of double cantilever beam and end-notched flexure test specimens were utilised for the direct extraction of the energy release rate and cohesive strength of the adhesive in failure mode I and II. Finally, these material properties were used as inputs to develop a finite element model using a cohesive zone model with triangular shape traction separation law. The developed model was successfully validated against experimental tensile lap-shear test results and was able to accurately predict the strength of adhesively-bonded MPDE pipeline joints with a maximum variation of <3%.
由于聚乙烯燃气管道的粘结能够快速制造出具有结构完整性和压力密封的低成本接头，作为传统电熔焊接的替代方法，它正受到越来越多的关注。本文通过连续三个步骤直接确定了一种基于模式的内聚区模型，用于模拟粘结中密度聚乙烯（MDPE）管道接头。首先，通过拉伸试验获得MDPE被粘物的体积应力 - 应变响应，以提供多线性数值近似来模拟材料的塑性变形。其次，利用双悬臂梁和端部切口弯曲试验试样的力学响应，直接提取失效模式I和II中胶粘剂的能量释放率和内聚强度。最后，将这些材料特性用作输入，使用具有三角形牵引分离定律的内聚区模型开发有限元模型。所开发的模型通过实验拉伸搭接剪切试验结果成功验证，并且能够准确预测粘结MPDE管道接头的强度，最大变化率<3％。
