Evaluation of True Stress in Engineering Materials Using Optical Deformation Measurement Methods

Bogusz, Paweł; Popławski, Arkadiusz; Morka, Andrzej; Niezgoda, T.

doi:10.5604/12314005.1138307

Cited by 5 publications

(12 citation statements)

References 11 publications

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“…It consists of a set of cameras registering the shape changes of the tested object and a suitably adapted and programmed computer that stores and processes the recorded images. Depending on the configuration (i.e., the number and speed of cameras), the system can be used to analyze the displacement and deformation fields of both flat or spatial elements subjected to static or dynamic load [42].…”

Section: Methodsmentioning

confidence: 99%

“…Logarithmic strains are computed locally in X- and Y-directions of the selected coordinate system in each photo as follows [42,46]:εlog=logλ…”

Section: Methodsmentioning

confidence: 99%

“…Measurements performed during the tensile test were supported by the Aramis system based on the digital image correlation (DIC) method. Such measurement equipment was successively used for measuring strains for specimens made of steel [41,42], wood [43], rubber [44], and foam [45]. It can be also adopted to observe the strains level within the tested structures, such as a seat belt, lattice structures, or composite joints [45,46].…”

Section: Introductionmentioning

confidence: 99%

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Identification of Mechanical Properties for Titanium Alloy Ti-6Al-4V Produced Using LENS Technology

et al. 2019

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This paper presents a characterization study of specimens manufactured from Ti-6Al-4V powder with the use of laser engineered net shaping technology (LENS). Two different orientations of the specimens were considered to analyze the loading direction influence on the material mechanical properties. Moreover, two sets of specimens, as-built (without heat treatment) and after heat treatment, were used. An optical measurement system was also adopted for determining deformation of the specimen, areas of minimum and the maximum principal strain, and an effective plastic strain value at failure. The loading direction dependence on the material properties was observed with a significant influence of the orientation on the stress and strain level. Microstructure characterization was examined with the use of optical and scanning electron microscopes (SEM); in addition, the electron backscatter diffraction (EBSD) was also used. The fracture mechanism was discussed based on the fractography analysis. The presented comprehensive methodology proved to be effective and it could be implemented for different materials in additive technologies. The material data was used to obtain parameters for the selected constitutive model to simulate the energy absorbing structures manufactured with LENS technology. Therefore, a brief discussion related to numerical modelling of the LENS Ti-6Al-4V alloy was also included in the paper. The numerical modelling confirmed the correctness of the acquired material data resulting in a reasonable reproduction of the material behavior during the cellular structure deformation process.

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Section: Methodsmentioning

confidence: 99%

“…Logarithmic strains are computed locally in X- and Y-directions of the selected coordinate system in each photo as follows [42,46]:εlog=logλ…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identification of Mechanical Properties for Titanium Alloy Ti-6Al-4V Produced Using LENS Technology

et al. 2019

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“…Cabezas and Celentano [28] used FEM to find correction factors for cylindrical and plane steel specimens. Bogusz et al [29] used digital image correlation and FEM simulations to compare correction factors from different analytical models. Ling [30] extrapolated the hardening from before necking and validated it with an FEM simulation of the post-necking deformation.…”

Section: Introductionmentioning

confidence: 99%

An experimental–numerical method to determine the work-hardening of anisotropic ductile materials at large strains

Khadyko¹,

Dumoulin²,

Hopperstad³

2014

International Journal of Mechanical Sciences

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The determination of work hardening for ductile materials at large strains is difficult to perform in the framework of usual tensile tests because of the geometrical instability and necking in the specimen at relatively low strains. In this study we propose a combination of experimental and numerical techniques to overcome this difficulty. Extruded aluminium alloys are used as a case since they exhibit marked plastic anisotropy. In the experiments, the minimum diameters of the axisymmetric tensile specimen in two normal directions are measured at high frequency by a laser gauge in the necking area together with the corresponding force, and the true stress-strain curve is found. The anisotropy of the material is determined from its crystallographic texture using the crystal plasticity theory. This data is used to represent the specimen by a 3D finite element model with phenomenological anisotropic plasticity. The experimental true stress-strain curve is then used as a target curve in an optimization procedure for calibrating the hardening parameters of the material model.As a result, the equivalent stress-strain curve of the material up to fracture is obtained.

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“…The physical mechanisms of the methods and experimental studies are analyzed. In work [10], an evaluation of the method for determining the stress in a sample of steel subjected to a static load (tensile test) is described. Measurements of deformation are presented using traditional extensometers and optical systems.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Mathematical Model's Choice Reasoning and Its Implementation for the Evaluation of the Strength of Technological Vessels

Karpash¹,

Oliinyk

2017

EUREKA: Physics and Engineering

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In connection with the global increase in the intensity of use of working equipment related to high-risk facilities and the expiry of the service life limit, the question arises of determining the actual technical condition and forecasting the residual resource. From the analysis of the approaches to determining the technical state and on the analysis of regulatory documents, it becomes clear that the regulated methods of assessing the technical state are obsolete, such that they do not ensure the reliability of the obtained control results. A new technique for determining the actual technical state through monitoring the level of stresses in the body of high-risk objects is proposed. The new technique takes into account additional physical and mechanical parameters that affect the stress-strain state, and have not yet been used. In other words, the technique of multivariable control of stress determination was proposed. Mathematical models of the process of deformation and stress for cylindrical vessels with a spherical and conic dome operating under the action of high pressure are proposed.

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Evaluation of True Stress in Engineering Materials Using Optical Deformation Measurement Methods

Cited by 5 publications

References 11 publications

Identification of Mechanical Properties for Titanium Alloy Ti-6Al-4V Produced Using LENS Technology

Identification of Mechanical Properties for Titanium Alloy Ti-6Al-4V Produced Using LENS Technology

An experimental–numerical method to determine the work-hardening of anisotropic ductile materials at large strains

Mathematical Model's Choice Reasoning and Its Implementation for the Evaluation of the Strength of Technological Vessels

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