Dynamic shear localization of a titanium alloy under high-rate tension characterized by x-ray digital image correlation

Wu, Songbo; Bie, B.X.; Fan, D.; Sun, Tao; Fezzaa, Kamel; Feng, Z.D.; Huang, J.Y.; Luo, Sheng‐Nian

doi:10.1016/j.matchar.2018.01.011

Cited by 24 publications

(2 citation statements)

References 34 publications

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“…A constant check is performed to see if the current displacement is within the given safety range. In addition, Digital Image correlation (DIC) on a 2D X-ray image of the complete sample ROI [22] or the sample's notch opening [3] can be used to attain, respectively, accurate local displacement or strain measurements directly of the sample. However these techniques are cumbersome, not real time, do not provide feedback on axial alignment and requires enough X-ray contrast for proper DIC correlation.…”

Section: Conceptual Design and Realisationmentioning

confidence: 99%

A Multi-loading, Climate-Controlled, Stationary ROI Device for In-Situ X-ray CT Hygro-Thermo-Mechanical Testing

et al. 2018

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In-situ CT mechanical testing yields a full 3D description of a sample material's behaviour under specific loads. In the literature various devices are proposed which enable in-situ CT hygro-, thermo-or mechanical testing, each with its own merits and limitations. However none of them is able to perform advanced hygro-thermo-mechanical tests on specimens subjected to multiple loading modes, while accurately controlling and measuring the force, displacement, temperature and relative humidity in real time. Therefore, this work proposes an in-situ CT device which allows such multi-faceted experiments. Improvements to the current state-of-the-art devices include: (1) a compact, lightweight and rotationally symmetric design that enables high-resolution CT scans by minimization of wobble during scanning, in practically all labscale CT scanners; (2) a stationary region of interest by loading the sample from both sides, which enables high resolution CT characterization of materials exhibiting a large fracture strain; and (3) improved testing modularity by exchanging clamping methods to allow samples of various sizes (e.g., circular or rectangular) to be inserted in a variety of ways, thereby facilitating complex experiments such as three-or four-point bending tests. Validation experiments demonstrate that stringent requirements on CT resolution, loading and displacement accuracy and climate control are met. Furthermore, the in-situ testing capabilities of the device were validated by CT characterization of the creasing and folding process of multi-layer cardboard under varying (controlled) levels of relative humidity and temperature.

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Section: Conceptual Design and Realisationmentioning

confidence: 99%

A Multi-loading, Climate-Controlled, Stationary ROI Device for In-Situ X-ray CT Hygro-Thermo-Mechanical Testing

et al. 2018

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“…There are many studies on the dynamic mechanical properties of Ti-6Al-4V [7][8][9][10][11][12][13][14][15]. Hu et al [11] studied the effect of strain rate on the mechanical properties of Ti-6Al-4V, and the results showed that the work hardening rate and flow stress increased with the increase of strain rate, and the formation of ASB (adiabatic shear band) resulted in the failure of the material.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Static, Dynamic Compressive Properties and Deformation Mechanisms of Ti-6Al-4V Alloy with Gradient Structure

Lei

Zhang

Zhao

et al. 2021

Metals

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Gradient structure metals have good comprehensive properties of strength and toughness and are expected to improve the dynamic mechanical properties of materials. However, there are few studies on the dynamic mechanical properties of gradient structured materials, especially titanium alloys. Therefore, in this study, ultrasonic surface rolling is used to prepare a gradient structure layer on the surface of Ti-6Al-4V, and the quasi-static and dynamic compressive properties of coarse-grained Ti-6Al-4V (CG Ti64) and gradient-structured Ti-6Al-4V (GS Ti64) are investigated. The results show that a GS with a thickness of 293 µm is formed. The quasi-static compressive strength of GS Ti64 is higher than that of CG Ti64. Both CG Ti64 and GS Ti64 exhibit weak strain hardening effects and strain rate insensitivity during dynamic compression, and the compressive strength is not significantly improved. The lateral expansion of CG Ti64 is more obvious, while the lateral side of GS Ti64 is relatively straight, indicating that uniform deformation occurs in GS Ti64. The α phase in the GS produces dislocation cells and local deformation bands, and the lamellar structure is transformed into ultrafine crystals after dynamic compression. Both of them produce an adiabatic shear band under 2700 s−1, a large crack forms in CG Ti64, while GS Ti64 forms a small crack, indicating that GS Ti64 has better resistance to damage. The synergistic deformation of GS and CG promotes Ti-6Al-4V to obtain good dynamic mechanical properties.

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In-Situ Visualization of Tensile Failure in Additively Manufactured 316 L Stainless Steel

et al. 2019

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Dynamic shear localization of a titanium alloy under high-rate tension characterized by x-ray digital image correlation

Cited by 24 publications

References 34 publications

A Multi-loading, Climate-Controlled, Stationary ROI Device for In-Situ X-ray CT Hygro-Thermo-Mechanical Testing

A Multi-loading, Climate-Controlled, Stationary ROI Device for In-Situ X-ray CT Hygro-Thermo-Mechanical Testing

Quasi-Static, Dynamic Compressive Properties and Deformation Mechanisms of Ti-6Al-4V Alloy with Gradient Structure

In-Situ Visualization of Tensile Failure in Additively Manufactured 316 L Stainless Steel

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