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Evaluation of a Micromechanism-Inspired Ductile Fracture Criterion for Formability and Fracture Prediction in Single Point Incremental Forming of AA1050 Aluminum Sheet | ||
| Iranian Journal of Materials Forming | ||
| دوره 14، شماره 1، 2027، صفحه 73-95 اصل مقاله (2.02 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijmf.2026.56675.1386 | ||
| نویسندگان | ||
| Seyed Amin Teymouri Sendesi1؛ Mohammad Mehdi Kasaei1، 2؛ Majid Majidi* 1؛ Seyed Jalal Hashemi3 | ||
| 1Department of Mechanical Engineering, Qa. C., Islamic Azad University, Qazvin, Iran | ||
| 2Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI), Porto, Portugal | ||
| 3Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran | ||
| چکیده | ||
| This study presents an experimental and numerical investigation of ductile fracture prediction in the single-point incremental forming (SPIF) of AA1050 aluminum sheets. The mechanical properties of the material were determined using uniaxial tensile tests, and the combined Swift-Voce hardening law was employed to define the plastic behavior of the material at strains beyond the onset of necking. The micromechanism-inspired ductile fracture criterion DF2014 was calibrated using uniaxial, plane-strain, in-plane shear, and notched tensile tests through the curve fitting toolbox in MATLAB and implemented in ABAQUS/Explicit 2022 through a VUSDFLD user subroutine, incorporating both linear and nonlinear damage accumulation rules. SPIF simulations were performed for a straight groove, a truncated cone, and a truncated pyramid, both with variable wall angles, and validated against experimental measurements of in-plane principal strains and thickness variations. The results demonstrate that incorporating the nonlinear damage accumulation rule, which accounts for the non-proportional loading history and evolving stress state during SPIF, substantially improves fracture prediction compared with the linear rule. The resulting predicted fracture initiation depths for the truncated cone and truncated pyramid agreed well with the experimental results, with errors of 6.1% and 4.6%, respectively. On the other hand, the variable cut-off value for stress triaxiality in the DF2014 criterion and its ability to predict fracture under stress states with negative triaxiality did not have a significant effect on the results due to the predominance of tensile stress states during the forming of the truncated cone and truncated pyramid. | ||
| کلیدواژهها | ||
| Incremental forming؛ SPIF؛ Ductile fracture؛ DF2014؛ Aluminum alloy | ||
| مراجع | ||
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