Investigation on the constraint effect on the fracture toughness assessment of stainless steel AISI 304L thin sheets
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Tizi-Ouzou University, Mechanical Engineering Department, Tizi-Ouzou, Algeria
Tizi-Ouzou University, LEC2M Laboratory, Tizi-Ouzou, Algeria
University of Picardie Jules Verne, Laboratory of Innovative Technology, Amiens, France
Submission date: 2019-05-17
Acceptance date: 2019-07-31
Online publication date: 2020-01-15
Publication date: 2020-01-15
Journal of Theoretical and Applied Mechanics 2020;58(1):143–153
The aim of the study is to assess the constraint effect induced by variation of geometric pa- rameters on fracture toughness of stainless steel 304L thin sheets. A combined experimental-computational method is used. Compact Tension (CT) tests are firstly done using a spe- cial device realized to avoid buckling problems. Finite element analysis is used including the GTN (Gurson-Tvergaard-Needleman) model based on micromechanical assumptions of ductile fracture to obtain crack propagation. The fracture toughness is evaluated using an in- cremental formulation of the J-Integral. The results obtained show a quantified dependency of the critical fracture toughness on the constraint effect.
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