Failure Analysis of Thin-Walled Extruded Aluminum Tubes Using MSFLD-Based Criteria

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This study presents a numerical investigation of failure initiation and evolution in thin-walled extruded aluminum tubes subjected to three-point bending and dynamic axial compression. An explicit finite element framework is employed, combining the Müschenborn--Sonne forming limit diagram (MSFLD) with stress-state-dependent ductile and shear fracture criteria to capture multiple competing failure mechanisms. The approach accounts for instability-driven necking as well as fracture governed by evolving stress triaxiality and Lode parameter. Numerical predictions are validated against experimental results through both quantitative comparison of load-displacement responses and qualitative assessment of deformation patterns and fracture locations. The results demonstrate that incorporating stress-state-dependent fracture criteria significantly improves the predictive accuracy of crash simulations involving thin-walled aluminum structures.

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193-203

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August 2026

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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