This study investigates the buckling and post-buckling behavior of composite pipes under internal pressure, with a focus on the effect of embedding NiTi wires with shape memory alloy (SMA) effect on improving mechanical capacity and controlling post-buckling. The pipes were made of carbon/epoxy composite (T300/5208) and fabricated using a filament winding process with a [−55/55] layup. Shape memory wires under 5% prestrain were embedded in multiple layers to provide compressive force against residual tensile stresses caused by curing and to enhance the mechanical performance of the tubes. Three models were analyzed using Abaqus software: a pipe without SMA and internal pressure, a pressurized pipe without SMA, and a pressurized SMA-reinforced pipe. Buckling analysis using a linear perturbation solver and examining the first five buckling modes was performed; then, post-buckling analysis using a general nonlinear static solver and applying initial deflection according to mode I was performed. The results showed that the presence of the memory wire increased the critical buckling force by less than 1% and increased the internal pressure capacity of the pipes by 20%, without negatively changing the post-buckling behavior under internal pressure. These findings indicate that the use of shape memory alloys can be an effective and practical solution for improving the mechanical performance and increasing the pressure capacity of composite pipes, especially in industrial applications and advanced structures.
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Pourmoayed,A , Ranjbar,M A and Seyednejad,S M . (2026). Buckling and Post-Buckling Analysis of Composite Pipe Reinforced with Shape Memory Alloy under Internal Pressure. Science and Technology in Mechanical Engineering, 4(2), 205-218. doi: 10.22034/stme.2025.544309.1165
MLA
Pourmoayed,A , , Ranjbar,M A , and Seyednejad,S M . "Buckling and Post-Buckling Analysis of Composite Pipe Reinforced with Shape Memory Alloy under Internal Pressure", Science and Technology in Mechanical Engineering, 4, 2, 2026, 205-218. doi: 10.22034/stme.2025.544309.1165
HARVARD
Pourmoayed A, Ranjbar M A, Seyednejad S M. (2026). 'Buckling and Post-Buckling Analysis of Composite Pipe Reinforced with Shape Memory Alloy under Internal Pressure', Science and Technology in Mechanical Engineering, 4(2), pp. 205-218. doi: 10.22034/stme.2025.544309.1165
CHICAGO
A Pourmoayed, M A Ranjbar and S M Seyednejad, "Buckling and Post-Buckling Analysis of Composite Pipe Reinforced with Shape Memory Alloy under Internal Pressure," Science and Technology in Mechanical Engineering, 4 2 (2026): 205-218, doi: 10.22034/stme.2025.544309.1165
VANCOUVER
Pourmoayed A, Ranjbar M A, Seyednejad S M. Buckling and Post-Buckling Analysis of Composite Pipe Reinforced with Shape Memory Alloy under Internal Pressure. STME. 2026;4(2):205-218 (In Persian). doi: 10.22034/stme.2025.544309.1165
Science and Technology in Mechanical Engineering