A study of Inconel 718 dependency on stress triaxiality and Lode angle in plastic deformation and ductile fracture

Algarni, Mohammed; Bai, Yuanli; Choi, Youngsik

doi:10.1016/j.engfracmech.2015.08.007

Cited by 84 publications

(28 citation statements)

References 51 publications

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“…It was assumed that a crack starts growing by the voids nucleation-growth-coalescence mechanism when the accumulated effective plastic strain reaches the critical value. In turn, it was assumed after the numerous published papers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] that the critical accumulated effective plastic strain depends on the triaxiality factor and Lode angle. To confirm these assumptions, the experimental programme and numerical computations were performed to a) calibrate the uniaxial tensile curves and b) estimate the critical effective plastic strains.…”

Section: Discussionmentioning

confidence: 99%

Estimation of the Onset of Crack Growth in Ductile Materials

Neimitz

Gałkiewicz

Lipiec

et al. 2018

Preprint

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In this paper, the ductile fracture mechanism is discussed. The results of the numerical and experimental analyses are used to estimate of the onset of the crack front growth . It is assumed that the ductile fracture in front of the crack starts at the location along the crack front where the accumulated effective plastic strain reaches a critical value. It is also assumed that the critical effective plastic strain depends on the stress triaxiality and the Lode angle. The experimental programme was performed using five different specimen geometries, three different materials and three different temperatures of +20°C, -20°C and -50°C. Using the experimental data and the results of the finite element computations, the critical effective plastic strains are determined for each material and each temperature. However, before the critical effective plastic strain is determined, a careful calibration of the stress–strain curves was performed after modification of the Bai–Wierzbicki procedure. Finally, by analysing the experimental results recorded during the interrupted fracture tests and scanning microscopy observations, the research hypothesis is verified.

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Section: Discussionmentioning

confidence: 99%

Estimation of the Onset of Crack Growth in Ductile Materials

Neimitz

Gałkiewicz

Lipiec

et al. 2018

Preprint

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“…Finally, the failure mode showed a flat fracture surface (Figure 7). It is recommended that the reader refer to [23,24] in order to understand why the fracture surface shape differs from one metal to another. Another observation is related to the necking behavior of both tool steels.…”

Section: Fracture Of Specimensmentioning

confidence: 99%

Mechanical Properties and Microstructure Characterization of AISI “D2” and “O1” Cold Work Tool Steels

Algarni

2019

Metals

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This research analyzes the mechanical properties and fracture behavior of two cold work tool steels: AISI “D2” and “O1”. Tool steels are an economical and efficient solution for manufacturers due to their superior mechanical properties. Demand for tool steels is increasing yearly due to the growth in transportation production around the world. Nevertheless, AISI “D2” and “O1” (locally made) tool steels behave differently due to the varying content of their alloying elements. There is also a lack of information regarding their mechanical properties and behavior. Therefore, this study aimed to investigate the plasticity and ductile fracture behavior of “D2” and “O1” via several experimental tests. The tool steels’ behavior under monotonic quasi-static tensile and compression tests was analyzed. The results of the experimental work showed different plasticity behavior and ductile fracture among the two tool steels. Before fracture, clear necking appeared on “O1” tool steel, whereas no signs of necking occurred on “D2” tool steel. In addition, the fracture surface of “O1” tool steel showed cup–cone fracture mode, and “D2” tool steel showed a flat surface fracture mode. The dimple-like structures in scanning electron microscope (SEM) images revealed that both tool steels had a ductile fracture mode.

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“…Recent works of Bai and Wierzbicki [19] and Algarni et al [20,21] implements a modified Mohr-Coulomb (M-C) criterion for the ductile fracture. This failure criterion has been extensively used for the description of porous media, such as rocks and soils, however, its ability to consider the stress triaxiality η and Lode angle parameter θ effects makes it suitable for the description of metallic materials too.…”

Section: Ductile Damage Criteriamentioning

confidence: 99%

Evaluation of the horizontal load-carrying capacity of a thin steel bridge pier by means of the Damage Subloading Surface model

Fincato

Tsutsumi

Momii³

2018

MATEC Web Conf.

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The evaluation of the load-carrying capacity of a structure is an important aspect of the structural design. In particular, large seismic events can significantly compromise the performances of structures, or parts of them, due to the formation and accumulation of plastic deformation. In the present paper, we analyse the seismic performance of a thin steel bridge column by means of an unconventional elastoplastic and damage model. The idea is to evaluate the horizontal load-carrying capacity of the pier for different seismic events, analysing the conditions that can compromise the stability of the structure.

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A study of Inconel 718 dependency on stress triaxiality and Lode angle in plastic deformation and ductile fracture

Cited by 84 publications

References 51 publications

Estimation of the Onset of Crack Growth in Ductile Materials

Estimation of the Onset of Crack Growth in Ductile Materials

Mechanical Properties and Microstructure Characterization of AISI “D2” and “O1” Cold Work Tool Steels

Evaluation of the horizontal load-carrying capacity of a thin steel bridge pier by means of the Damage Subloading Surface model

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