Abstract
The ductile damage of automotive aluminum sheet alloy AA5754-H111 is investigated by experiments and numerical simulation using the Gurson-Tvergaard-Needleman (GTN) mo- del. The GTN parameters were determined by a uni-axial tensile test and the inverse finite element method. The same parameters were employed to provide the ductile damage beha- vior of central cracked panel (CCP) specimens. A good prediction can be established among the numerical simulation and experimental data in from of the force opening displacement. As an application, the identified GTN model is used to predict the influence of cold wor- king on deformation and ductile damage. The numerical simulation results obtained are assimilated with experimental data.
Highlights
In automotive applications, the aluminum alloys are extensively used for obtaining light mass and high strength structures
The tensile specimens have been stretched in the rolling direction (RD), the transversal direction (TD) and the diagonal direction (DD 45◦ between RD and TD) of the sheets
A good agreement is observed between the experimental results and those prediced by the finite element method
Summary
The aluminum alloys are extensively used for obtaining light mass and high strength structures. Aluminum-Magnesium (Al-Mg) aluminum alloys, indicated by 5xxx series, have a very good formability but a relativity low strength. The results of investigation of mechanical damage of 5754-H111 aluminum alloy has indicated that damage and fracture are mostly results of nucleating, growing and coalescing of micro cavities or micro voids. The Gurson model was modified by Tvergaard and Needleman (1984) by introducing parameters q1 and q2 They founded the void fusion equation f ∗ to describe ductile failure by nucleation, growth and coalescence of spherical micro voids. Benseddiq and Imad (2007) used the GTN damage model to investigate ductile tearing of 2024-T351 aluminum alloy. Ductile tearing of 5754 aluminum alloy has been analyzed by using the GTN model. The theoretical results are compared with experimental ones in the case of cold worked tensile and central cracked panels (CCP)
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