Hysteretic effects of damage and stress on ductile fracture characterization

✍ Scribed by Wang June; C.L. Chow

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 765 KB
• Volume: 34
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(89)90254-3

✦ Synopsis

A significant phenomenon known as hysteretic effect resulting from the damage evolution of material degradation upon loading observed in the stress analysis based on the theory of continuum damage mechanics is the structural response to the relative rotational change of principal stress and damage planes. No such observation is identified in the conventional stress analysis. This paper presents an investigation of highlighting the hysteretic effects on the fracture behaviors of the mixed mode fracture plates of j = 90, 75, 60, 45 and 30". While the hysteresis is confined to 15" for the plates analyzed under the proportional loading, the magnitude is markedly increased under the arbitrary or non-proportional loading which often occurs in engineering structures. In addition, a new fracture criterion known as h-criterion which is defined by the angle of the radial and principal damage planes in a material element is proposed to determine the angle of crack initiation for the mixed mode plates and found to be in satisfactory agreement with experimental observations.