Investigation of Micromechanical Deformation Mechanisms in Sinter Powder Metals

Chen, Jin Mu; Yuan, Huang; Schneider, Markus

doi:10.4028/www.scientific.net/amr.668.351

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…Explicit expressions for both damage evolutions have been obtained. (5) Predictions from the CDM model have been verified with experimental data. Only in pure torsion the model seems to overestimate development of both elastic and plastic damage in the small strain region.…”

Section: Discussionmentioning

confidence: 92%

“…Many works have been done in experimental and computational study of deformation and damage mechanism of sintered metals. Chen et al [5] investigated the deformation mechanism of sintered iron combining nanoindentation with FEM simulation and concluded that inelastic behavior of sintered metals is influenced by inelastic deformations in metal matrix as well as micro-crack propagation induced by voids. Microscopic damage mechanism of sintered metals is investigated in monotonic in-situ tensile tests [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Continuum damage mechanics for sintered powder metals

Yuan

Zhang³

2014

Sci. China Phys. Mech. Astron.

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Sintered metals are characterized by the high porosity ( 8%) and voids/micro-cracks in microns. Inelastic behavior of the materials is coupled with micro-crack propagation and coalescence of open voids. In the present work the damage evolution of the sintered iron under multi-axial monotonic loading conditions was investigated experimentally and computationally. The tests indicated that damage of the sintered iron initiated already at a stress level much lower than the macroscopic yield stress. The damage process can be divided into the stress-dominated elastic damage and the plastic damage described by the plastic strain. Based on the uniaxial tensile tests an elastic-plastic continuum damage model was developed which predicts both elastic damage and plastic damage in the sintered iron under general multi-axial monotonic loading conditions. Computational predictions agree with experiments with different multi-axial loading paths. A phenomenological continuum damage model for the sintered metal is developed based on the experimental observations to predict the inelastic behavior and damage process to failure under multi-axial loading conditions. The proposed damage model is experimentally verified under different loading conditions. sintered metal, porous material, damage evolution, multi-axial damage, continuum damage model PACS number(s): 46.35.+q, 46.50.+a, 81.20.Ev, 81.40.Lm Citation:Yuan H, Ma S Y, Zhang L. Continuum damage mechanics for sintered powder metals.

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Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Continuum damage mechanics for sintered powder metals

Yuan

Zhang³

2014

Sci. China Phys. Mech. Astron.

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“…Jiang [ 19 ] also investigated the micropore closure at different positions during the hot‐forging process using the finite element method. Meanwhile, Chen [ 20 ] revealed internal micropore evolution mechanisms based on a nonlinear finite element model. Furthermore, Yu [ 21 ] reported crack closure and micropore formation during the rolling process using the finite element method and proposed a related closure criterion for cracks.…”

Section: Introductionmentioning

confidence: 99%

Micropore Evolution and Damage Behavior of Rapid‐Solidified Al–Zn–Mg–Cu Alloy during Hot Plastic Forming

et al. 2023

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Rapid‐solidified Al–Zn–Mg–Cu alloys possess widespread application prospects owing to their excellent properties, particularly high specific strength. Nevertheless, their further development for use as advanced structural parts is significantly limited by their intrinsic porosity. Herein, the flow stress subroutine and micropore evolution model are combined to predict the cracking and damage behavior of a rapidly solidified Al–Zn–Mg–Cu disk‐shaped part during hot forging. The results reveal that the damage to the part during plastic forming is inversely proportional to the relative density. Reasonable matching between the height‐to‐diameter ratio (H/D) and the initial relative density is the key factor in avoiding cracking and damage to the part. The closure sequence of the micropores is from the center to the outside of the billet. A billet with an H/D of 1 and initial relative density of 0.95 can reach full density after forming, and a damage‐free part can be obtained. These simulation results are verified by analyzing the microstructural characteristics and mechanical properties of the actual forged part.

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Computational investigation of multi-axial damage modeling for porous sintered metals with experimental verification

Ma¹,

Yuan

2015

Engineering Fracture Mechanics

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The experimental investigation shows that the damage process in sintered metals can be divided into three stages: the elastic stage, the secondary stage and finally the tertiary stage. A phenomenological continuum damage model is introduced to predict the inelastic behavior of the sintered material and the damage process. The numerical implicit integration algorithm is developed and implemented into ABAQUS. The proposed damaged model is computationally and experimentally verified under multi-axial loading conditions. It is confirmed that the proposed damage model is able to properly describe the mechanical behavior and the damage evolution under most different loading configurations.

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Investigation of Micromechanical Deformation Mechanisms in Sinter Powder Metals

Cited by 7 publications

References 7 publications

Continuum damage mechanics for sintered powder metals

Continuum damage mechanics for sintered powder metals

Micropore Evolution and Damage Behavior of Rapid‐Solidified Al–Zn–Mg–Cu Alloy during Hot Plastic Forming

Computational investigation of multi-axial damage modeling for porous sintered metals with experimental verification

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