Assessment of Deformation Field during High Strain Rate Tensile Tests of RAFM Steel Using DIC Technique

Krishnan, S.A.; Baranwal, Ankit; Moitra, A.; Sasikala, G.; Albert, Shaju K.; Bhaduri, A.K.; Harmain, G.A.; Jayakumar, T.; Kumar, E. Rajendra

doi:10.1016/j.proeng.2014.11.021

Cited by 12 publications

(3 citation statements)

References 14 publications

(11 reference statements)

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“…Images were captured using an iX i-SPEED 7 CCD camera (iX Cameras, Shanghai, China) at the rate of 10 fps (frames per second), with a pixel array of 350 × 750 pixels. Then, the data were analyzed by DIC software to obtain the strain field distribution [19]. The experimental setup is shown in Figure 4.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Low-Carbon High-Strength Steel Fabricated by Wire and Arc Additive Manufacturing

Li-hua

Jiang

Huang

et al. 2020

Metals

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Wire and arc additive manufacturing (WAAM) is a novel technique for fabricating large and complex components applied in the manufacturing industry. In this study, a low-carbon high-strength steel component deposited by WAAM for use in ship building was obtained. Its microstructure and mechanical properties as well as fracture mechanisms were investigated. The results showed that the microstructure consisted of an equiaxed zone, columnar zone, and inter-layer zone, while the phases formed in different parts of the deposited component were different due to various thermal cycles and cooling rates. The microhardness of the bottom and top varied from 290 HV to 260 HV, caused by temperature gradients and an inhomogeneous microstructure. Additionally, the tensile properties in transversal and longitudinal orientations show anisotropy characteristics, which was further investigated using a digital image correlation (DIC) method. This experimental fact indicated that the longitudinal tensile property has an inferior performance and tends to cause stress concentrations in the inter-layer areas due to the inclusion of more inter-layer zones. Furthermore, electron backscattered diffraction (EBSD) was applied to analyze the difference in Taylor factor between the inter-layer area and deposited area. The standard deviation of the Taylor factor in the inter-layer area was determined to be 0.907, which was larger than that in the deposited area (0.865), indicating nonuniform deformation and local stress concentration occurred in inter-layer area. Finally, as observed from the fracture morphology on the fractured surface of the sample, anisotropy was also approved by the comparison of the transversal and longitudinal tensile specimens.

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Section: Methodsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Low-Carbon High-Strength Steel Fabricated by Wire and Arc Additive Manufacturing

Li-hua

Jiang

Huang

et al. 2020

Metals

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“…In the analysis of material behavior, studies using the DIC technique have been conducted on construction materials such as brick [23], stone [24], and composites [25], in the process of concrete fracturing [26], and in the analysis of deformation of steel subjected to tensile stress [27][28][29]. DIC has also been used for plastic materials, such as polycarbonates [30] or polymeric matrix laminates [31], and has been proposed as a system for evaluating the deformation of railway lines [32].…”

Section: Dic Techniquementioning

confidence: 99%

Analysis of Mechanical Behavior through Digital Image Correlation and Reliability of Pinus halepensis Mill.

Villarino

López-Rebollo

Antón

2020

Forests

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The mechanical behavior of test pieces extracted from two specimens of Pinus halepensis Mill., from the same geographical area and close to each other, was examined in this study. Using a methodology based on Digital Image Correlation (DIC) and implemented during compression strength testing, the modulus of elasticity in compression parallel to the grain (MOEc) was obtained. In addition, the value of compressive strength (MORc) was obtained for this type of wood. The research was complemented with a reliability study, determined using the Weibull modulus, from the MORc values. A microstructural and behavioral study of the most representative pieces after failure was also conducted to correlate breakage with the behavior of the pieces during the tests monitored by DIC, to link both studies. DIC was shown to be an ideal and low-cost technique for the determination of the studied properties, and obtained average values of MOEc of 50.72 MPa and MORc of 9693 MPa. These values represent fundamental data for design and calculations of wooden structures. A reliability value of between 11 and 12 was obtained using the Weibull modulus for this type of wood.

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“…A combination of DIC and high-speed camera has been used to investigate metals at high strain rates in uniaxial tests [7], by Split Hopkinson bar methods [8] or by 3-point bending methods to receive the stress intensity factor on a brittle metallic composite [9]. In these investigations 0.05 Mfps was the fastest recording speed.…”

Section: Sebastian Myslicki Markus Ortlieb Gerrit Frieling and Franmentioning

confidence: 99%

High-precision deformation and damage development assessment of composite materials by high-speed camera, high-frequency impulse and digital image correlation techniques

Myslicki¹,

Ortlieb²,

Frieling³

et al. 2015

Materials Testing

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Although composite materials like wood, vulcanized fiber and carbon reinforced plastic (CFRP) are already investigated by means of their mechanical properties, the abrupt fracture mechanism as well as the deformation behavior right before and after fracture has not been investigated. However, it is marginally investigated for CFRP because of the quite high fracture speed. The knowledge about the damage evolution as the crack start and propagation can help to improve the strength and sensitivity to fracture by improving the materials structure and to utilize these materials for structural applications. For the investigated materials, fracture happens abruptly as it is the nature of composites and the detailed fracture mechanisms could not be detected by conventional measurement techniques. Therefore, an innovative combination of testing devices is presented which is able to fill this gap. Tensile tests were performed to receive conventional stress-strain curves. At the fracture stage, a high-speed camera recorded the fracture process. This information could be combined with digital image correlation (DIC) to visualize the deformation behavior. At the same time acoustic emission (AE) was used to detect the spectrum of mechanical vibrations which gives information about the released energy due to fracture. The challenging triggering of the high-speed camera was solved for each material individually. By using improved light sources, the recording speed could be set up to 2 million frames per second (Mfps). The investigations show different fracture mechanisms for each composite. Wood and vulcanized fiber were also investigated in different directions due to their anisotropy.

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Assessment of Deformation Field during High Strain Rate Tensile Tests of RAFM Steel Using DIC Technique

Cited by 12 publications

References 14 publications

Microstructure and Mechanical Properties of Low-Carbon High-Strength Steel Fabricated by Wire and Arc Additive Manufacturing

Microstructure and Mechanical Properties of Low-Carbon High-Strength Steel Fabricated by Wire and Arc Additive Manufacturing

Analysis of Mechanical Behavior through Digital Image Correlation and Reliability of Pinus halepensis Mill.

High-precision deformation and damage development assessment of composite materials by high-speed camera, high-frequency impulse and digital image correlation techniques

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