Dynamic Shear Deformation and Failure of Ti-6Al-4V and Ti-5Al-5Mo-5V-1Cr-1Fe Alloys

Ran, Chun; Chen, Pengwan

doi:10.3390/ma11010076

Cited by 19 publications

(12 citation statements)

References 41 publications

(54 reference statements)

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“…It should be noted that although the cracks extend into the shear band to some extent ( Figure 4 d), almost all cracks occurred at the shear band/matrix interface. Similar phenomena have been observed in Ti-55511 alloy [ 16 , 28 , 29 ].…”

Section: Resultssupporting

confidence: 85%

“…Combined with our previous work [ 16 , 29 ] and the microstructures shown in Figure 4 and Figure 5 , the sequence of the microstructural evolution within an ASB for Ti-55511 alloy can be summarized, and Figure 7 is the schematic representation. As shown in Figure 7 a, an ASB forms due to the occurrence of severe strain concentration in the shear region, and the grains or phases near the ASB are rotated and elongated along the shear direction (shown in Figure 4 and Figure 5 ).…”

Section: Resultsmentioning

confidence: 73%

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Microstructural Evolution in High-Strain-Rate Deformation of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

et al. 2018

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To study the microstructural evolution in high-strain-rate shear deformation of Ti-5Al-5Mo-5V-1Cr-1Fe (Ti-55511) alloy, a series of forced shear tests of hat-shaped specimens have been conducted using a split Hopkinson pressure bar combined with the “strain-frozen” technique. A localized shear band is induced in Ti-55511 alloy in these tests. The experimental results demonstrate that the flow stress in hat-shaped specimens remains constant (about 600 MPa) and is independent of punching depth. The width of the adiabatic shear band increases with increasing punching depth and tends to saturate at 30 μm, and the estimation of the adiabatic shear band (ASB) width in hat-shaped (HS) specimens has been modified. Relying on the experimental results, thermal softening has a minor effect on the onset of the adiabatic shear band and dynamic recrystallization formation, and the nucleation mechanism for dynamic recrystallization is strain-induced boundary migration and subgrain rotation and coalescence. In addition, we suggest the concept of adhesive fracture as the dynamic failure mechanism for Ti-55511 alloy.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 73%

Microstructural Evolution in High-Strain-Rate Deformation of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

et al. 2018

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“…However, this shear width value is higher than that of the design (W s = 0.2 mm). In most of the shear specimens, such as the hat-shaped and flat-hat-shaped, the plastic zone is considerably higher than expected, which leads to overestimation of the value of the reported strain calculated by Meyers methods [24]. Figure 15 shows the contour of the equivalent stress on the NSSS surface.…”

Section: Dicmentioning

confidence: 93%

“…This finding indicates that pure shear loading occurs for the NSSS during the test. Ran et al [24] found that in the flat hat-shaped sample the shear strain distribution was not equal. As shown in Figure 14, a line is drawn in the center of the NSSS to study the shear strain in the shear zone and calculate the width of the shear zone in the NSSS.…”

Section: Dicmentioning

confidence: 99%

A New S-Shape Specimen for Studying the Dynamic Shear Behavior of Metals

Arab

Guo

Zhou

et al. 2019

Metals

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A new S-shaped specimen geometry is developed in this study to investigate the shear behavior of materials under dynamic shear condition. Traditionally, hat-shaped geometry is used to study the dynamic shear of materials by a conventional split Hopkinson pressure bar apparatus. However, in this geometry, the force equilibrium on the two sides of the sample is difficult to fulfill, and the stress field in the shear region is not homogeneous. Hence, the calculated shear stress-strain curve from this geometry is not precise. To overcome this problem, the new S-shaped specimen is designed to achieve accurate shear stress-strain curve. This geometry can be used in a wide range of strain rates and does not require additional machining process for microstructure observation. The new S-shaped specimen is successfully coupled with digital image correlation method because of the flat surface. Digital image correlation results indicate that the fracture patterns of the new S-shaped specimen occur with maximum shear strains in the shear region in the middle of the sample. This result is also validated by finite element model simulation. The new S-shaped specimen geometry can be used to study the dynamic shear behavior of various metals.Metals 2019, 9, 838 2 of 17 force equilibrium [11]. Thus, the calculated shear stress-strain from this geometry is a rough estimate and inaccurate [19,23]. In addition, the shearing region rotates during testing due to the overlapping nature of the shear area in this geometry. To overcome these problems, Ran et al. [24] adopted the flat hat-shaped sample combined with digital image correlation (DIC) measurement. They measured force and punching displacement from the split Hopkinson pressure bar (SHPB) and shear strain by the DIC method. They achieved accurate strain rate and also calculated the shear engineering stress and strain using the DIC method. However, without using the DIC method, obtaining the shear stress-strain curve is impossible using this geometry. Rittel et al.[3] developed a new geometry for shear test. In this sample, by applying compressive loading a shear dominant field occurs in the gauge section. This geometry can be used in static and dynamic loadings, as well as in different temperatures. However, this sample design does not constitute a 'simple' shear loading stress state within the gauge section but a rather three-dimensional stress state. Moreover, this geometry leads to a radial inertial effect of the sample motion under dynamic loading [19]. Recently, Xu et al. [11] proposed a new double side sample to study the shear band. They observed good agreement between the experimental and simulation results in a wide range of strain rates. However, they designed a special sample fixture to ensure that the shear would be symmetrical. They also used an aluminium bar as the transmitted bar because of the weak transferred pulse. Gray et al. [19] also designed a compact forced simple shear sample to study shear localization in materials. Although this sample could produce pu...

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“…α + β titanium alloys have attracted great interest in a variety of industries and fields owing to the high specific strength, reasonable ductility, and ability to withstand corrosion resistance [ 1 , 2 , 3 ]. With widespread engineering applications, the mechanical behavior of the alloys under high strain-rate loading has been essentially required not only in ballistic impact conditions, but also in normal manufacture processes [ 4 , 5 , 6 ] and the accompanied failure behavior [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Strain Rate Sensitivity of Tensile Properties in Ti-6.6Al-3.3Mo-1.8Zr-0.29Si Alloy: Experiments and Constitutive Modeling

et al. 2018

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The complex deformation usually involves wide strain-rate change. However, few efforts have been devoted to investigate the effect of strain rate history on the tensile behavior of α + β titanium alloy. In present paper, tensile tests of Ti-6.6Al-3.3Mo-1.8Zr-0.29Si alloy were carried out under both constant and variable strain-rate conditions within the region from 10−3~500 s−1. A single stress pulse experimental technique was utilized to conduct the recovery tests. The strain-rate history effect was examined. It is found that the flow stress is independent on the strain rate history, though the alloy exhibits obvious positive strain rate sensitivity. The Taylor-Quinney coefficient of the plastic work converted to heat is proved as 0.9 at high strain rates. The cavitation fracture mechanism is revealed by microstructural observation over the full range explored. In basis of the experimental results and other pulished literatures, empirical Khan-Huang-Liang constitutive model was suitably modified to account for the strain-rate dependent behavior. Good agreement is achieved between the modeling prediction results and experimental data.

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Dynamic Shear Deformation and Failure of Ti-6Al-4V and Ti-5Al-5Mo-5V-1Cr-1Fe Alloys

Cited by 19 publications

References 41 publications

Microstructural Evolution in High-Strain-Rate Deformation of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

Microstructural Evolution in High-Strain-Rate Deformation of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

A New S-Shape Specimen for Studying the Dynamic Shear Behavior of Metals

Strain Rate Sensitivity of Tensile Properties in Ti-6.6Al-3.3Mo-1.8Zr-0.29Si Alloy: Experiments and Constitutive Modeling

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