Journal ArticleDOI
Strain and stress relation until fracture for finite element simulations of a thin circular plate
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In this paper, a true strain and stress relation for mild steel was obtained from a series of tensile experiments with specimens of different length-per-breadth ratios and used to simulate a plate punching experiment until fracture with the finite element method.Abstract:
This paper presents a true strain and stress relation for mild steel that is suitable for the implementation in finite element models. This true strain and stress relation is obtained from a series of tensile experiments with specimens of different length-per-breadth ratios. Unlike the engineering strain and stress relation, the true strain and stress relation is found to be independent of the specimen geometries tested. The use of optical measurements relates the true strain and stress to the finite element length because the strain reference length, being a function of the pixel size, is clearly defined. This true strain and stress relation is used to simulate a plate punching experiment until fracture with the finite element method. The measured element length-dependent failure strain is implemented as a constant strain failure criterion and its applicability is attained through the close triaxiality ranges at failure, both for the tensile and plate simulations.read more
Citations
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On the failure criterion of aluminum and steel plates subjected to low-velocity impact by a spherical indenter
TL;DR: In this paper, an analytical failure criterion is proposed to characterise ship plated structures manufactured with aluminum or steel materials subjected to low impact velocities, and the criterion considers the critical deflection, force and absorbed energy of plates laterally impacted by a hemispherical indenter, and assumes that failure occurs at the presence of necking.
Journal ArticleDOI
The credibility of predictions for structural designs subjected to large dynamic loadings causing inelastic behaviour
TL;DR: In this article, the credibility of numerical calculations in engineering design is examined from a narrow perspective of the response of structures subjected to large dynamic, impact and blast loadings producing inelastic deformations and failure.
Journal ArticleDOI
The influence of the material relation on the accuracy of collision simulations
TL;DR: In this paper, the influence of the material relation on the accuracy of numerical results is not presented in detail in the present literature even though different material relations are used, and this comparison can support the future use of an appropriate material relation for collision simulations.
Journal ArticleDOI
On the accuracy of fracture estimation in collision analysis of ship and offshore structures
TL;DR: In this article, the fracture response in a collision scenario together with the discretization of the model is discussed and compared using a validation approach with different model scales; including material tests, indentation experiments and simulations of an actual full-scale collision event.
Journal ArticleDOI
Numerical modelling of the boundary conditions on beams stuck transversely by a mass
TL;DR: In this article, numerical results of a drop weight impact test examining the dynamic response of a clamped steel beams struck transversely at the centre by a mass with a rectangular indenter are presented.
References
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Journal ArticleDOI
A new model of metal plasticity and fracture with pressure and Lode dependence
Yuanli Bai,Tomasz Wierzbicki +1 more
TL;DR: In this paper, a 3D asymmetric fracture locus, in the space of equivalent fracture strain, stress triaxiality and the Lode angle parameter, is proposed.
Uniaxial True Stress-Strain after Necking
Yun Ling,Amp Incorporated +1 more
TL;DR: In this paper, a weighted average method for determining uniaxial, true tensile stress vs. strain relation after necking is presented for strip shaped samples for various alloys.
Journal ArticleDOI
Determining material true stress–strain curve from tensile specimens with rectangular cross-section
TL;DR: In this article, an extensive three-dimensional numerical study has been carried out on the diffuse necking behavior of tensile specimens made of isotropic materials with rectangular cross-section, and an approximate relation is established between the area reduction of the minimum cross-sectional and the measured thickness reduction.
Journal ArticleDOI
Comparison of the implicit and explicit finite element methods using crystal plasticity
Frank Harewood,Peter E. McHugh +1 more
TL;DR: In this study, a rate-dependent crystal plasticity algorithm was developed for use with the explicit FE package, ABAQUS/explicit, and showed that, for simpler loading conditions, the implicit method had a shorter solution time, while the explicit method proved to be the preferable choice.
Journal ArticleDOI
A new method for acquiring true stress–strain curves over a large range of strains using a tensile test and finite element method
TL;DR: In this paper, the authors presented a method for acquiring true stress-strain curves over large range of strains using engineering tensile test coupled with a finite element analysis, and verified the validity of the approach by comparing tensile tests with finite element solutions obtained using a modified true stressstrain curve.