TY  - EJOU
AU  - Zhangabay, Nurlan 
AU  - Suleimenov, Ulanbator 
AU  - Bonopera, Marco 
AU  - Ibraimova, Ulzhan 
AU  - Yeshimbetov, Shairbek 

TI  - A Method for Preventing Crack Propagation in a Steel Gas Conduit Reinforced with Composite Overlays
T2  - Structural Durability \& Health Monitoring

PY  - 2025
VL  - 19
IS  - 4
SN  - 1930-2991

AB  - This research presents a numerical simulation methodology for optimizing circular composite overlays’ dimensions and pressure characteristics with orthotropic mechanical properties, specifically, for metal conduits with temperature-dependent elastoplastic behavior. The primary objective of the proposed method is to prevent crack propagation during pressure surges from operational to critical levels. This study examines the “Beineu-Bozoy-Shymkent” steel gas conduit, examining its performance across a temperature range of −40 to +50°C. This work builds on prior research on extended avalanche destruction in steel gas conduits and crack propagation prevention techniques. The analysis was conducted using a dynamic finite-element approach with the ANSYS-19.2/Explicit Dynamics software. Simulations of unprotected conduits revealed that increasing gas-dynamic pressure can convert a partial-depth crack into a through-crack, extending longitudinally to approximately seven times its initial length. Notably, at T = +50°C, the developed crack length was 1.2% longer than that at T = −40°C, highlighting the temperature sensitivity of crack progression. The modeling results indicate that crack propagation can be effectively controlled using a circular composite overlay with a thickness between 37.5% and 50% of the crack depth and a length approximately five times that of the initial crack, centered symmetrically over the crack. In addition, preliminary stress analysis indicated that limiting the overlay-induced pressure to 5% of the operational pressure effectively arrested crack growth without generating significant stress concentrations near the overlay boundaries, thereby preventing conduit integrity.
KW  - Avalanche destruction; composite overlay; dynamic strength; finite-element; intrinsic gas-dynamic pressure; preliminary stress

DO  - 10.32604/sdhm.2025.064980