Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Sociedad Española de Integridad Estructural
Grupo Español de Fractura

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A MODIFIED GTN MODEL FOR THE PREDICTION OF DUCTILE FRACTURE AT LOW STRESS TRIAXIALITIES

F. Reis  L. Malcher  F. M. Andrade Pires  J. M. A. César de Sá     

Anales de la Mecánica de la Fractura, nº 27 . 2010 . Pág. -
Ver (.pdf): 63

Resumen: In this contribution, the so-called GTN constitutive model [1] is extended in order to include a shear mechanism on the damage evolution equation, which depends on the Lode angle. This mechanism is introduced in order to improve the damage prediction under shear dominated loads. From the numerical viewpoint, a fully implicit elastic predictor/return mapping algorithm is developed and the associated consistent elasto-plastic tangent operator is presented. The numerical model is assessed through the simulation of pure shear and combined shear/tensile stress states. Some representative results show the influence of the modifications on the constitutive model of several parameters such as porosity and accumulated plastic strain. A comparative study demonstrates that the proposed model provides better agreement with experimental evidence.

LocalizaciónPorto

1IDMEC – Institute of Mechanical Engineering Faculty of Engineering, University of Porto Rua Dr. Roberto Frias, Porto 4200-465, Portugal
1IDMEC – Institute of Mechanical Engineering Faculty of Engineering, University of Porto Rua Dr. Roberto Frias, Porto 4200-465, Portugal
1IDMEC – Institute of Mechanical Engineering Faculty of Engineering, University of Porto Rua Dr. Roberto Frias, Porto 4200-465, Portugal
1IDMEC – Institute of Mechanical Engineering Faculty of Engineering, University of Porto Rua Dr. Roberto Frias, Porto 4200-465, Portugal



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