Finite Element Analysis of Composite Repair for Damaged Steel Pipeline

Chen, Jiaqi; Wang, Hao; Salemi, Milad; Balaguru, P.

doi:10.3390/coatings11030301

Cited by 17 publications

(5 citation statements)

References 36 publications

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“…Moreover, CFRP matrix composite overwrap repair systems have been introduced as alternative repair systems for steel pipelines. Through finite element (FE) analysis, the mechanical behavior of damaged steel pipelines with CFRP repair was evaluated, considering different repair strategies such as wrap repair and patch repair (Chen et al, 2021). There are two main methods commonly used for composite repair are autoclave curing and heat blanket curing (Kubit et al, 2020).…”

Section: Article Info Abstractmentioning

confidence: 99%

Effects of Porosity on CFRP Repair Performance with Aerospace Applications

BAYSALLI,

CAMBAZ,

GÖRGÜLÜ

2024

Journal of Aviation

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On-site repairs of carbon fiber reinforced polymer composites, wet layup repairs with heat blanket method play a critical and practical role for the composite defects that occur in production and assembly. The porosity level should be controlled for the repair parts with heat blanket method since the pressure value, which enables ply consolidation, reduce the risk of delamination in the composite layers, is less or zero with the wet layup repaired parts with heat blanket compared to repair parts with autoclave pressure. In this experimental study, an investigation was conducted regarding the tensile strength change of prepreg structures using wet lay-up repair techniques with heat blanket based on the porosity, with a specific focus on stepped-repaired carbon fiber reinforced polymer laminates. This work aims to understand the strength and the associated failure mechanisms of on-site repaired woven carbon fiber reinforced polymer laminates through experiments. The Automatic Ultrasonic Pulse Echo Inspection Method was utilized to see whether porosity level of each repaired samples is within allowable design limits for this purpose. Prepreg structure's repairs using wet lay-up produced according to standardized aerospace procedures were tested under uniaxial tension per ASTM 3039D. The relationship between attenuation difference (ΔdB) and tensile fracture values has been explored, with a focus on investigating the associated failure mechanisms. Initially, a 60% strength recovery was observed for repairs with an 8-decibel difference. However, as the decibel difference increased, the strength recovery gradually decreased, ultimately reaching 45.2%.

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Section: Article Info Abstractmentioning

confidence: 99%

Effects of Porosity on CFRP Repair Performance with Aerospace Applications

BAYSALLI,

CAMBAZ,

GÖRGÜLÜ

2024

Journal of Aviation

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“…Two repair strategies, wrap and patch repair, are analyzed under Maximum Allowable Operating Pressure (MAOP) conditions. Findings suggest that thicker CFRP reduces stress in both the pipe wall and CFRP, and enhancing CFRP reinforcement can be achieved with higher elastic modulus infill materials [8].…”

Section: Introductionmentioning

confidence: 97%

Repair Analysis of Overlay Woven Fabric CFRP Laminates

Baysalli,

Cambaz,

Görgülü

et al. 2024

Sakarya University Journal of Science

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The increase in aerospace composites usage for structural components demands advanced repair analysis. Overlay repairs of carbon fiber-reinforced polymer laminates offer an alternative that is easier to perform and less time-consuming to produce than the widely used tapered scarf repair and stepped lap. Composite specimen manufacturing was based on both twill carbon/epoxy prepreg and wet lay-up. The repair was performed with both prepreg and wet extra plies to the parent prepreg structure. However, the design of overlay joints must be carefully investigated to avoid generating stress concentration regions at free edges. This study examined specific extra ply terminations' impact on peak stresses in the adhesive bond line. Linear finite element analysis was performed to conduct a maximum principal stress study with a focus on three joint design parameters: ply material, overply effect, and stacking sequence. FEA accurately predicted experimentally observed responses and provided further insight into the failure behavior of the structure. Results showed that overlay joints have a strong sensitivity to ply material type, the number of overply, and stacking sequence. The introduction of overplies provided protection and stiffness at joint tips, and an overply material behavior was identified. The location of 0̊ plies in the composite laminates was highlighted as an important factor. The analysis was then extended to three-dimensional FE models for verification. In conclusion, results showed that high-stress concentration in overlay joints can be mitigated with the introduction of overplies and appropriate changes in joint design parameters to reduce stress peaks at joint tips and corners.

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“…This contributes to thermal stresses in the material, especially in the presence of defects. When the temperature changes, properties such as the strength, elasticity, and plasticity change [7,8]. This, in turn, affects the ability of the pipeline to resist mechanical loads and deformations, changing the nature of the fracture processes.…”

Section: Introductionmentioning

confidence: 99%

Finite-Element Modeling of the Temperature Effect on Extended Avalanche Damage of Gas Main Pipelines

Zhangabay,

Ibraimova,

Ainabekov

et al. 2024

Materials

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The dynamic stress–strain state and fracture of a steel main gas pipe section between supports with a straight-through crack was analyzed with consideration of the temperature effect on changes in the mechanical properties of the pipe material. The numerical solution of the problem was implemented in the ANSYS-19.2/Explicit Dynamics software package. The process of fracture in a section of the gas pipeline “Beineu–Bozoy–Shymkent” with a linear crack in the temperature range of −40 °C to +50 °C at the operating pressure of 7.5 MPa and critical pressure equal to 9.8 MPa was considered. As a result, it was found that at the initial growth of the internal pressure from working pressure to critical pressure, the length of the crack doubled. At the same time, the process had a local characteristic. Further development of the crack had the nature of avalanche fracture and depended on the temperature of the steel pipeline. With increasing temperature, there was also an increase in the length of the crack at the avalanche fracture. Thus, at a temperature of 40 °C, the crack lengthened 67.75-fold; at a temperature of −10 °C, the crack lengthened 68-fold; at a temperature of +20 °C, the crack lengthened 68.25-fold; and at a temperature of +50 °C, the crack lengthened 68.5-fold. In this work, this difference was 75% of the initial crack length. This fact will be used for further development of the technique of strengthening damaged pipe sections using bandages.

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Finite Element Analysis of Composite Repair for Damaged Steel Pipeline

Cited by 17 publications

References 36 publications

Effects of Porosity on CFRP Repair Performance with Aerospace Applications

Effects of Porosity on CFRP Repair Performance with Aerospace Applications

Repair Analysis of Overlay Woven Fabric CFRP Laminates

Finite-Element Modeling of the Temperature Effect on Extended Avalanche Damage of Gas Main Pipelines

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