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1 Department of Mechanical Engineering, Technical University of Denmark 2 Manufacturing Engineering, Department of Mechanical Engineering, Technical University of Denmark 3 Universidade de Lisboa 4 Technical University of Dortmund 5 University of Reading
Fracture in metal forming can occur in three different modes: (i) tensile; (ii) in-plane shear; and (iii) out-of-plane shear (respectively the same as modes I, II and III of fracture mechanics). The circumstances under which each mode will occur are identified in terms of plastic flow and microstructural ductile damage by means of an analytical framework to characterize fracture loci under plane stress conditions that also takes anisotropy into consideration. Experimental results retrieved from the literature give support to the presentation and show that plastic flow and failure in sheet forming results from competition between modes I and II whereas in bulk forming fracture results from competition between modes I and III. © 2014 Elsevier Ltd.
International Journal of Mechanical Sciences, 2014, Vol 83, p. 112-123
Bulk metal forming; Crack separation modes; Fracture forming limit diagram; Fracture loci; Sheet metal forming; Ductile fracture; Fracture mechanics; Plastic flow; Sheet metal; Fracture forming limit diagrams; Fracture locus; In-plane shear; Micro-structural; Out-of-plane shear; Plane stress condition; Separation modes; Metal forming
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