Strain Analysis of Ti6Al4V Titanium Alloy Samples Using Digital Image Correlation

Karolewska, Karolina; Ligaj, Bogdan; Boroński, Dariusz

doi:10.3390/ma13153398

Cited by 12 publications

(6 citation statements)

References 21 publications

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“…The increase in hardness along the Z axis may be related to changes in the microstructure caused by material deformations as a result of the tensile test. Similar relationships for another material, which is the titanium alloy Ti6Al4V made with additive technology, were obtained in the works [9,10]. The material hardness on the xy plane ranges from 221.0 ÷ 235.0 HV10, which is a slight difference14 HV10 hardness in this area.…”

Section: Hardness Test Resultssupporting

confidence: 73%

Analysis of test results under static load conditions of 316L steel

2021

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Metal powder 3D printing technology is gaining popularity due to the possibility of producing structural elements of complex geometry, which production with the methods used so far is difficult or impossible to obtain. An example of a material used in the parts production by the additive method is 316L steel, which is used in the production of bone support screws, surgical tools and needles, or in other industries for the production of exhaust manifolds, parts of furnaces or heat exchangers. The study investigated the mechanical properties, hardness and microstructure of 316L steel produced in the selective laser melting process (SLM). Based on the tests, the following mechanical properties of 316L steel were obtained: Su = 566.7MPa, Sp0.2 = 484MPa, E = 113820MPa, A = 79.5%, Z = 72.3%. The hardness test results show a significant increase in hardness as the tensile test approaches the sample fracture. The structure of 316L steel in the grip part is characterized by the formation of visible semi-elliptical zones of the material alloy, the pools with crystallized grains with a cell-column structure oriented in the direction of the thermal gradient. This type of microstructure is characteristic of technology in which, after solidification, the cooling process takes place at high speed.

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Section: Hardness Test Resultssupporting

confidence: 73%

Analysis of test results under static load conditions of 316L steel

2021

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“…The analysis of strain fields by the DIC method enables one to select the size and position of the virtual extensometer on the gauge section of the specimen in the zone of The analysis of strain fields by the DIC method enables one to select the size and position of the virtual extensometer on the gauge section of the specimen in the zone of localization of the plastic flow [18,19]. This makes it possible to increase the accuracy and adequacy of the obtained true stress-true strain diagrams on a stage of diffuse necking.…”

Section: Methodsmentioning

confidence: 99%

Localization of Plastic Deformation in Ti-6Al-4V Alloy

Skripnyak

2021

Metals

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This article investigated the mechanical behavior of Ti-6Al-4V alloy (VT6, an analog to Ti Grade 5) in the range of strain rates from 0.1 to 103 s−1. Tensile tests with various notch geometries were performed using the Instron VHS 40/50-20 servo hydraulic testing machine. The Digital Image Correlation (DIC) analysis was employed to investigate the local strain fields in the gauge section of the specimen. The Keyence VHX-600D digital microscope was used to characterize full-scale fracture surfaces in terms of fractal dimension. At high strain rates, the analysis of the local strain fields revealed the presence of stationary localized shear bands at the initial stages of strain hardening. The magnitude of plastic strain within the localization bands was significantly higher than those averaged over the gauge section. It was found that the ultimate strain to fracture in the zone of strain localization tended to increase with the strain rate. At the same time, the Ti-6Al-4V alloy demonstrated a tendency to embrittlement at high stress triaxialities.

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“…In order to study the thickness debit effect, it is necessary to obtain deformation data. However, traditional strain gauge methods can only obtain average strains in a single direction and cannot provide information about local area deformation [17,18]. Therefore, single-camera 3D-DIC technology has been shown to have advantages such as a high testing accuracy, cost-effectiveness, and small space occupation and can be used for experiments at the same working distance without the need for calibration before each experiment, compared with traditional methods.…”

Section: Introductionmentioning

confidence: 99%

Creep Behavior Characterization of Nickel-Based Single-Crystal Superalloy DD6 Thin-Walled Specimens Based on a 3D-DIC Method

Zhang

Kang

et al. 2023

Materials

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The thickness debit effect of creep behavior has been a focal point of nickel-based single-crystal superalloy research, and there is a need for an advanced creep deformation measurement method. This study developed a novel high-temperature creep test system based on a single-camera stereo digital image correlation (DIC) method with four plane mirrors to conduct creep tests on thin-walled specimens of a nickel-based single-crystal alloy, DD6, with thicknesses of 0.6 mm and 1.2 mm under experimental conditions of 980 °C/250 MPa. The reliability of the single-camera stereo DIC method in measuring long-term deformation at a high temperature was experimentally verified. The experimental results show that the creep life of the thinner specimen was significantly shorter. It was found the lack of coordination in the creep deformation process of the edge and middle section of the thin-walled specimens may be an important factor in the thickness debit effect according to the full-field strain contour. By comparing the local strain curve at the rupture point with the average creep strain curve, it was found that the creep rate at the rupture point was less affected by the specimen thickness during the secondary creep stage, while the average creep rate in the working section significantly increased as the wall thickness decreased. The thicker specimen usually had a higher average rupture strain and higher damage tolerance, which prolonged the rupture time.

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Strain Analysis of Ti6Al4V Titanium Alloy Samples Using Digital Image Correlation

Cited by 12 publications

References 21 publications

Analysis of test results under static load conditions of 316L steel

Analysis of test results under static load conditions of 316L steel

Localization of Plastic Deformation in Ti-6Al-4V Alloy

Creep Behavior Characterization of Nickel-Based Single-Crystal Superalloy DD6 Thin-Walled Specimens Based on a 3D-DIC Method

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