Ductile Fracture Mechanics in Metallic Materials
Summary
Ductile fracture in metals is a progressive process driven by microscopic void nucleation, growth and eventual coalescence under plastic deformation. The local stress state, characterised by stress triaxiality and the Lode parameter, governs the evolution of these voids. At low triaxiality, shear-driven mechanisms dominate, whereas high triaxiality promotes void enlargement and rapid failure. Modern approaches couple continuum damage mechanics with micromechanical models to predict fracture onset and propagation, often integrating phenomenological criteria into finite‐element analyses. Advances in high‐resolution imaging and in situ techniques now enable multi‐scale observations of void distributions, informing parameter calibration in models such as the Gurson–Tvergaard–Needleman framework. Recent efforts have also introduced data-driven and machine-learning methods to capture complex dependencies on strain rate, temperature and microstructural heterogeneities. Practical applications span automotive crashworthiness, aerospace structural integrity, metal forming operations and the design of advanced alloys with tailored fracture resistance.
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Ductile Fracture Mechanics in Metallic Materials publication trend
The graph below shows the total number of articles in ductile fracture mechanics in metallic materials across all publications each year (not limited to Nature Index journals).
Technical terms
Stress triaxiality: Ratio of mean stress to equivalent von Mises stress, governing void growth rate.
Lode parameter: A measure of the third stress invariant controlling the influence of shear on fracture.
Void coalescence: Final stage of ductile fracture when neighbouring voids link to form a crack.
Fracture locus: Curve relating critical plastic strain at fracture to stress-state parameters.
Gurson–Tvergaard–Needleman (GTN) model: A continuum damage model accounting for void volume fraction evolution under plastic flow.
References
- Neural network based rate- and temperature-dependent Hosford–Coulomb fracture initiation model. International Journal of Mechanical Sciences (2023).
- Stress–strain curves of metallic materials and post‐necking strain hardening characterization: A review. Fatigue & Fracture of Engineering Materials & Structures (2019).
- Alternative approach to model ductile fracture by incorporating anisotropic yield function. International Journal of Solids and Structures (2019).
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