Mechanical behavior of a near α titanium alloy under dynamic compression: Characterization and modeling

Shi, Xiaohui; Zhao, Cong; Cao, Zuhan; Zhang, Tuanwei; Wang, Zhihua; Qiao, J.W.

doi:10.1016/j.pnsc.2019.07.001

Cited by 9 publications

(4 citation statements)

References 27 publications

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“…Results of high triaxiality tension show increasing plastic flow stress with decreasing notch radius at strain rates of 0.1, 100, and 1000 s −1 . This indicates a significant strain hardening of near alpha titanium alloys observed under quasi-static and at high strain rate loading conditions [28,29,31,32].…”

Section: Results Of Tensile Testsmentioning

confidence: 84%

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Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality

Skripnyak

2020

Metals

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The present study investigates the effect of stress triaxiality on mechanical behavior and fracture of Ti-5Al-2.5Sn alloy in a practical relevant strain rate range from 0.1 to 1000 s−1. Tensile tests were carried out on flat smoothed and notched specimens using an Instron VHS 40/50-20 servo-hydraulic test machine. High-speed video registration was conducted by Phantom 711 Camera. Strain fields on the specimen gauge area were investigated by the digital image correlation method (DIC). The fracture surface relief was studied using digital microscope Keyence VHX-600D. Stress and strain fields during testing of the Ti-5Al-2.5Sn alloy were analyzed by the numerical simulation method. The evolution of strain fields at the investigated loading condition indicates that large plastic deformation occurs in localization bands. The alloy undergoes fracture governing by damage nucleation, growth, and coalescence in the localized plastic strain bands oriented along the maximum shear stresses. Results confirm that the fracture of near alpha titanium alloys has ductile behavior at strain rates from 0.1 to 1000 s−1, stress triaxiality parameter 0.33 < η < 0.6, and temperature close to 295 K.

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Section: Results Of Tensile Testsmentioning

confidence: 84%

“…The temperature rise associated with energy dissipation during plastic flow can be evaluated by relation [28]: (10) where T 0 is the initial temperature and β ~0.9 is the parameter representing a fraction of plastic work converted into heat.…”

Section: Numerical Simulation Of Plastic Flow and Damage Evolutionmentioning

confidence: 99%

Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality

Skripnyak

2020

Metals

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“…The equation of state was calibrated to pressures of 125 GPa for alpha titanium and Ti-6Al-4V alloy. The plastic potential Φ was described using the Gurson-Tvergaard-Needleman model (GTN) [29][30][31][32][33]. The function φ(f) takes the form (1−f) for pressure and is implicitly defined for the deviatoric stress tensor [31,32].…”

Section: Model Of Lfwmentioning

confidence: 99%

Modeling of Titanium Alloys Plastic Flow in Linear Friction Welding

et al. 2021

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The article presents the results of the analysis of the plastic flow of titanium alloys in the process of the Linear Friction Welding (LFW). LFW is a high-tech process for joining critical structural elements of aerospace engineering from light and high-temperature alloys. Experimental studies of LFW modes of such alloys are expensive and technically difficult. Numerical simulation was carried out for understanding the physics of the LFW process and the formation laws of a strong welded joint of titanium alloys. Simulation by the SPH method was performed using the LS DYNA software package (ANSYS WB 15.2) and the developed module for the constitutive equation. The new coupled thermomechanical 3D model of LFW process for joining structural elements from alpha and alpha + beta titanium alloys was proposed. It was shown that the formation of a welded joint occurs in a complex and unsteady stress-strain state. In the near-surface layers of the bodies being welded, titanium alloys can be deformed in the mode of severe plastic deformation. A deviation of the symmetry plane of the plastic deformation zone from the initial position of the contact plane of the bodies being welded occurs during a process of LFW. Extrusion of material from the welded joint zone in the transverse direction with respect to the movement of bodies is caused by a pressure gradient and a decrease in the alloy flow stress due to heating. The hcp-bcc phase transition of titanium alloys upon heating in the LFW process necessitates an increase in the cyclic loading time to obtain a welded joint.

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“…Microstructural observations revealed that shear bands composed of ultrafine equiaxed grains appeared in the dynamic specimens, which were believed to be the result of subgrain rotational dynamic recrystallization. Shi et al [ 10 ] predicted the flow stress of a near α Ti-8Al-1Mo-1V titanium alloy during dynamic compression by the J-C model and found that an adiabatic shear band began to form at the strain rate of 2100 s −1 . Ran et al [ 11 ] found that the Ti-5Al-5Mo-5V-1Cr-1Fe alloy undergoes shear fracture under shock loading, and the failure occurs along a plane at an angle of about 45° to the compression axis.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Deformation Behavior and Fracture Characteristics of a near α TA31 Titanium Alloy at High Strain Rates

Zhang

et al. 2022

Materials

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The quasi-static and dynamic impact compression tests of the TA31 titanium alloy were conducted at the strain rates from 0.001 s−1 to 4000 s−1 and deformation temperatures from 293 K to 773 K, and the TA31 titanium alloy showed typical elastic-plastic characteristics. In the initial stage of compression (elastic deformation), the stress and strain are proportional, and the stress–strain curve is a straight line. In the plastic deformation stage, the flow stress decreases significantly with the increase of deformation temperature, while the strain rate has no significant effect on the flow stress during dynamic compression. A constitutive model has been established to predict the flow stress, and the relative error is 2.32%. It is shown by observing the microstructure that when the deformation temperature is 293 °C, and the strain rate reaches 1600 s−1, a shear band with an angle of about 45° to the axial direction of the specimen appears, and the severe shear deformation makes the α phase in the shear band fibrous and contains high-density dislocations. The formation process of the shear band and its influence on fracture are analyzed and discussed.

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Mechanical behavior of a near α titanium alloy under dynamic compression: Characterization and modeling

Cited by 9 publications

References 27 publications

Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality

Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality

Modeling of Titanium Alloys Plastic Flow in Linear Friction Welding

Dynamic Deformation Behavior and Fracture Characteristics of a near α TA31 Titanium Alloy at High Strain Rates

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