The failure mechanism analysis of corroded pipelines repaired with CFRP under bending loads using FEM

ABSTRACT

Corroded pipelines are often repaired with Carbon Fibre-Reinforced Polymers (CFRPs) because of their low cost, fast and easy process. In this paper, the Finite Element Method (FEM) was used to establish the model of corroded pipelines repaired with CFRP under bending loads. The progressive damage subroutine was used to simulate the damage of CFRP, and the cohesive element was used to simulate the damage to the interface. The failure modes of repaired and unrepaired pipelines were in good agreement with the experimental results. It was found that the failure order of CFRP and adhesive was different when the thickness of the adhesive changed. Failure competition existed between CFRP and adhesive, which led to different ultimate loads of the repaired pipelines. This research reveals that the failure modes and ultimate loads are relevant to the competition mechanism of different materials in composite structures.

KEYWORDS:

• CFRP
• corroded pipelines
• ultimate load
• FEM
• failure competition

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships. All the authors agree to the attached manuscript.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant numbers 52222111 and 51779266].