Experimental program and numerical assessment for determination of stress triaxiality and J effects on AA6101-T4

Malcher, L.; Morales, Leopoldo; Rodrigues, Vinícius Anéas; Silva, V.R.M.; Araújo, L.M.; Ferreira, Guilherme Viana; Neves, R.S.

doi:10.1016/j.tafmec.2020.102476

Cited by 12 publications

(2 citation statements)

References 19 publications

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“…the porosity is a function of the volumetric part of the plastic strain tensor, which represents the growth of the defect mechanisms. Among them, the Gurson model stands out [20], and other phenomenological extensions are proposed in the literature [21,43,44,45]. For the construction of Gurson's mathematical model [20], Hooke's Law in its original and generalized form is considered ( see equation 11).…”

Section: Gurson's Mathematical Modelmentioning

confidence: 99%

Numerical evaluation of the ductile fracture for AA6101-T4 and AISI 4340 alloys using the Lemaitre and Gurson models

Delgado-Morales,

Malcher,

Alves de Souza

2023

Ingeniare. Rev. chil. ing.

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This paper provides a numerical assessment of the ductile fracture of the AA6101 and AISI 4340 alloys using the Lemaitre and Gurson models.The simulations were carried out to verify the evolution of the accumulated plastic strain at fracture, assuming the high range of the triaxiality ratio, applying monotonic tensile loads on smooth and notched cylindrical specimens. The numerical strategy was structured for the Lemaitre and Gurson models, from establishing a non-linear system of equations using an implicit integration algorithm and solving the non-linear equation system using the Newton-Raphson method. When assessing the numerical and experimental results, it was observed that the cumulative plastic strain at the fracture decreases with the increasing levels of the triaxiality ratio for both alloys and models. On the one hand, the Lemaitre model was more optimistic than the experimental results. On the other hand, Gurson's model proved to be more conservative in its prediction of ductile fracture. Regarding determining the fracture onset, in general, both models showed good predictive capacity. However, the numerical results for the aluminum alloy presented more in agreement with experimental data than for the AISI 4340 alloy. In the end, assuming the determination of the level of displacement at fracture, the Gurson's model has the best performance. In this sense, for a high level of triaxiality ratio, the Gurson porous material can be recommended to describe the mechanical behavior of the material at fracture.

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Section: Gurson's Mathematical Modelmentioning

confidence: 99%

Numerical evaluation of the ductile fracture for AA6101-T4 and AISI 4340 alloys using the Lemaitre and Gurson models

Delgado-Morales,

Malcher,

Alves de Souza

2023

Ingeniare. Rev. chil. ing.

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“…Despite years of studies, De Sá et al (2015) have shown that the study of ductile fracture remains a challenge for researchers and engineers globally. According to Malcher et al (2012) and Malcher et al (2020), the determination of the level of displacement at fracture, as well as the fracture onset, are important parameters for optimized design of structure and mechanical components. Several researchers, such as Brünig et al (2008) and Gao et al (2009), have worked to propose new models capable of describing the mechanical behavior of the material from damage initiation until the fracture, considering different calibration conditions and stress state parameters such as stress triaxiality and the normalized third invariant.…”

Section: Introductionmentioning

confidence: 99%

Damage to fracture in offshore engineering materials under several stress states: Blowout preventer valve application

Morales

Silva

Barros

et al. 2023

Advances in Structural Engineering

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This contribution proposes a study of the mechanical behavior from damage to fracture of normalized and annealed samples of AISI 4340 steel. Besides, a numerical study in a security device of offshore industry is conducted. Experimental tests were initially performed on smooth and notched cylindrical specimens subjected to monotonic tension as well as on rectangular specimens subjected to pure shear and a combination of shear and tension loads. Such experimental tests were selected to observe different combinations of the stress triaxiality and the normalized third invariant concerning the stress state. The two types of heat treatments were considered to achieve different levels of ductility and verify their influence on the fracture mode of the alloy. The approach based on the second invariant of the deviatoric stress tensor ( J 2), with nonlinear isotropic hardening, is assumed to describe the mechanical behavior of the material in axisymmetric and three-dimensional numerical simulations. Finite elements simulations were carried out to analyze the performance of a simplified version of a mechanism of a blow-out preventer-BOP valve. The experimental and numerical curves of force versus displacement were compared, highlighting the effect of the stress triaxiality, the third invariant and calibration condition on the behavior of the material. The evolution of the equivalent plastic strain was plotted, and the fracture onset compared with its maximum value. The results show that the AISI 4340 alloy is highly dependent on the stress triaxiality and third invariant. Moreover, it can be concluded that different calibration conditions for the isotropic hardening curve can result in different levels of forces for the correct performance of the BOP in a critical situation.

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Hybrid search methodology for mechanical characterization of material produced via WAAM assuming Gurson porous material

da Silva,

Silva,

Santos

et al. 2024

J Braz. Soc. Mech. Sci. Eng.

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Experimental program and numerical assessment for determination of stress triaxiality and J effects on AA6101-T4

Cited by 12 publications

References 19 publications

Numerical evaluation of the ductile fracture for AA6101-T4 and AISI 4340 alloys using the Lemaitre and Gurson models

Numerical evaluation of the ductile fracture for AA6101-T4 and AISI 4340 alloys using the Lemaitre and Gurson models

Damage to fracture in offshore engineering materials under several stress states: Blowout preventer valve application

Hybrid search methodology for mechanical characterization of material produced via WAAM assuming Gurson porous material

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