10.57647/jsm.2026.1801.02

A Comparative Assessment of DF2016 and MMC3Fracture Criteria for Predicting Crack Initiation inSingle Point Incremental Forming

  1. Department of Mechanical Engineering, Qa.C., Islamic Azad University, Qazvin, Iran

Received: 2026-01-14

Revised: 2026-02-23

Accepted: 2026-02-23

Published in Issue 2026-03-31

How to Cite

teymouri, seyed amin, Kasaei, M. M., Majidi, M., & Hashemi, S. J. (2026). A Comparative Assessment of DF2016 and MMC3Fracture Criteria for Predicting Crack Initiation inSingle Point Incremental Forming. Journal of Solid Mechanics, 18(1). https://doi.org/10.57647/jsm.2026.1801.02

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Abstract

Accurately predicting fracture remains a significant challenge in single point incremental forming (SPIF) due to the complex and inherently nonlinear loading paths. This study presents a comparative evaluation of two advanced ductile fracture criteria, DF2016 and the modified Mohr-Coulomb (MMC3), for predicting crack initiation in SPIF of AA1050 aluminum sheets. The fracture models were calibrated using tensile tests and implemented in Abaqus/Explicit 2022 via a VUSDFLD user subroutine, coupled with a Swift-Voce hardening law. Numerical models were validated by comparing simulated thickness distributions and in-plane strains against experimental data from truncated conical and pyramidal specimens with variable wall angle. To account for the non-proportional loading characteristic of SPIF, a nonlinear damage accumulation rule, calibrated using the straight groove test, was incorporated to improve prediction precision. The results indicate that both criteria successfully predict the onset depth and location of cracks, demonstrating good agreement with experimental observations. However, the DF2016 criterion exhibited superior accuracy over MMC3, attributed to its enhanced capability to capture a wider range of deformation modes.

Keywords

  • Incremental forming,
  • Fracture prediction,
  • Crack depth,
  • MMC3,
  • DF2016 criterion

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