Problematic. A combination of experimental and computational methods for studying the processes crack initiation propagation in various specimen’s types is used to determine mechanical properties materials, as well improve accuracy assessing strength durability structural elements. Research objective. Determination parameters Gurson-Tvergaard-Needleman (GTN) material damage model based on numer...

In this paper the capability of Gurson-Tvergaard-Needleman (GTN) model in the prediction of ductile damage in 7075-T651 aluminum alloy is investigated. For this purpose, three types of specimens were tested: Standard tensile bars, Round notched bar (RNB) specimens and compact tension (C(T)) specimens. Standard tensile bar tests were used to obtain the mechanical properties of the material and t...

New methods in metal forming are rapidly developing and several processes used to optimize manufacturing components reduce cost production. Single Point Incremental Forming (SPIF) is a sheet process for rapid prototyping applications small batch This work dedicated the investigation of profile geometry thickness evolution truncated pyramid. The influence parameters during SPIF also studied. A n...

The single point incremental forming (SPIF) is one of the dieless forming processes which is widely used in the sheet metal forming. The correct selection of the SPIF parameters influences the formability and quality of the product. In the present study, the Gurson-Tvergaard Needleman (GTN) damage model was used for the fracture prediction in the numerical simulation of the SPIF process of alum...

in this paper, a method to determine the material parameters of the lemaitre damage model from the knowledge of the gurson model parameters is proposed. as for porosity damage, the gurson model neglects the coupling of elasticity with damage, allowing to use the stress softening effect to make a link between both theories up to a fast identification procedure (based on the expressions of the yi...

The ductile fracture behavior of a high strength steel is addressed in this two-part study using micromechanics-based approach. objective Part II to propose, identify, and validate numerical model based on the Gurson–Tvergaard–Needleman model. This enhanced by Nahshon–Hutchinson shear modification combination with generalization Thomason coalescence criterion within fully nonlocal form relying ...

This paper focuses on numerical the prediction of multiaxial static strength lattice structures. We analyze a body-centered cubic cell printed with Selective Laser Melting in AlSi10Mg aluminum alloy. Parent material is experimentally characterized, and Gurson-Tveergard-Needleman (GTN) damage model calibrated to predict failure simulations. The GTN used structures exhibiting brittle localized fr...