4.7 Article

A modified Gurson model and its application to punch-out experiments

期刊

ENGINEERING FRACTURE MECHANICS
卷 76, 期 8, 页码 997-1009

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2009.01.003

关键词

Plasticity; Void growth; Shear fracture; Shear-off; Gurson model; Fracture strain

资金

  1. ONR [N00014-04-1-0154]
  2. Division of Engineering and Applied Sciences, Harvard University
  3. National Defense Science

向作者/读者索取更多资源

Recent experimental evidence has reiterated that ductile fracture is a strong function of stress triaxiality. Under high stress triaxiality loading, failure occurs as a result of void growth and subsequent necking of inter-void ligaments while under low stress triaxiality failure is driven by shear localization of plastic strain in these ligaments due to void rotation and distortion. The original Gurson model is unable to capture localization and fracture for low triaxiality, shear-dominated deformations unless void nucleation is invoked. A phenomenological modification to the Gurson model that incorporates damage accumulation under shearing has been proposed. Here we further extend the model and develop the corresponding numerical implementation method. Several benchmark tests are performed in order to verify the code. Finally, the model is utilized to model quasi-static punch-out experiments on DH36 steel. It is shown that the proposed modified Gurson model, in contrast to the original model, is able to capture the through-thickness development of cracks as well as the punch response. Thus, the computational fracture approaches based on the modified Gurson model may be applied to shear-dominated failures. Published by Elsevier Ltd.

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