Stress-Strain Curves and Modified Material Constitutive Model for Ti-6Al-4V over the Wide Ranges of Strain Rate and Temperature

Hou, Xin; Liu, Zhanqiang; Lv, Woyun; Hua, Yang

doi:10.3390/ma11060938

Cited by 59 publications

(42 citation statements)

References 23 publications

(22 reference statements)

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“…Due to the wide application of titanium alloys in the aerospace industry, where high-rate loadings are common, there are many investigations on the constitutive relationships of titanium alloys at high strain rates [ 13 , 14 , 15 , 16 , 17 ]. To account for grain-size effect, the classical Johnson–Cook constitutive model was modified by adding a grain strain term to characterize the mechanical properties of Ti–6Al–4V alloy of different grain sizes over a wide range of strain rates.…”

Section: Introductionmentioning

confidence: 99%

Strain-Rate-Dependent Tensile Response of Ti–5Al–2.5Sn Alloy

Zhang

Wang

et al. 2019

Materials

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This study is an experimental investigation on the tensile responses of Ti–5Al–2.5Sn alloy over a wide range of strain rates. Uniaxial tension tests within the rate range of 10−3–101 s−1 are performed using a hydraulic driven MTS810 machine and a moderate strain-rate testing system. The high-rate uniaxial tension and tension recovery tests are conducted using a split-Hopkinson tension bar to obtain the adiabatic and isothermal stress–strain responses of the alloy under dynamic loading conditions. The experimental results show that the value of the initial yield stress increases with the increasing strain rate, while the strain rate sensitivity is greater at high strain rates. The isothermal strain-hardening behavior changes little with the strain rate, and the adiabatic temperature rise is the main reason for the reduction of the strain-hardening rate during high strain-rate tension. The electron backscatter diffraction (EBSD) analysis of the post-deformed samples indicates that there are deformation twins under quasi-static and high-rate tensile loadings. Scanning electron microscope (SEM) micrographs of the fracture surfaces of the post-deformed samples show dimple-like features. The Zerilli–Armstrong model is modified to incorporate the thermal-softening effect of the adiabatic temperature rise at high strain rates and describe the tension responses of Ti–5Al–2.5Sn alloy over strain rates from quasi-static to 1050 s−1.

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Section: Introductionmentioning

confidence: 99%

Strain-Rate-Dependent Tensile Response of Ti–5Al–2.5Sn Alloy

Zhang

Wang

et al. 2019

Materials

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“…6b). In fact, since the yield stress of the Ti alloys is affected by extremely high strain rates (like in the case of an impact puncture test) [35,36], data from manuals (which refer to quasistatic conditions) could not be used. For this reason, in the present work, the material was modelled using a linear hardening model and the parameters (the yield stress, σ y , and the ultimate tensile strength, σ R ) were not assumed by literature but determined using an inverse methodology based on data from impact tests on disk-shaped samples.…”

Section: Fe Model Of the Drop Testmentioning

confidence: 99%

Design of custom cranial prostheses combining manufacturing and drop test finite element simulations

Palumbo

Piccininni

Ambrogio

et al. 2020

Int J Adv Manuf Technol

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In this work, impact puncture tests (drop tests) have been used to both tune numerical models and correlate the performance of customised titanium cranial prostheses to the manufacturing process. In fact, experimental drop tests were carried out either on flat disk-shaped samples or on prototypes of titanium cranial prostheses (Ti-Gr5 and Ti-Gr23 were used) fabricated via two innovative sheet metal forming processes (the super plastic forming (SPF) and the single point incremental forming (SPIF)). Results from drop tests on flat disk-shaped samples were used to define the material behaviour of the two investigated alloys in the finite element (FE) model, whereas drop tests on cranial prostheses for validation purposes. Two different approaches were applied and compared for the FE simulation of the drop test: (i) assuming a constant thickness (equal to the one of the undeformed blank) or (ii) importing the thickness distribution determined by the sheet forming processes. The FE model of the drop test was used to numerically evaluate the effect of the manufacturing process parameters on the impact performance of the prostheses: SPF simulations were run changing the strain rate and the tool configuration, whereas SPIF simulations were run changing the initial thickness of the sheet and the forming strategy. The comparison between numerical and experimental data revealed that the performance in terms of impact response of the prostheses strongly depends on its thickness distribution, being strain hardening phenomena absent due to the working conditions adopted for the SPF process or to the annealing treatment conducted after the SPIF process. The manufacturing parameters/routes, able to affect the thickness distribution, can be thus effectively related to the mechanical performance of the prosthesis determined through impact puncture tests.

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“…The aim of this work is to investigate the influence of cutting speed ranging from 30 m/min to 75 m/min on forces and chip morphologies of Ti6Al4V alloy. This paper compares and analyze the finite element simulated results from Johnson-Cook model [2], the modified Johnson-Cook model from Calamaz et al [3] that takes the strains softening behavior into account and the Modified Johnson-Cook from Hou et al [4] that takes into account temperature dependent hardening factor and its coupled effects between strain and temperature with the experimental work carried out by Ducobu [5] for the cutting speeds of 30 m/min, 50 m/min, 75 m/min. The forces and chip morphologies from the nine simulations are compared and are validated with the experimental results.…”

Section: Intr Introduction Oductionmentioning

confidence: 99%

Influences of Cutting Speed and Material Constitutive Models on Chip Formation and their Effects on the Results of Ti6Al4V Orthogonal Cutting Simulation

Palanisamy¹,

Rivière-Lorphèvre²,

Arrazola³

et al. 2021

Esaform 2021

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The highly used Ti6Al4V alloy is a well know hard-to-machine material. The modelling of orthogonal cutting process of Ti6Al4V attract the interest of many researchers as it often generates serrated chips. The purpose of this paper is to show the significant influence of cutting speed on chip formation during orthogonal cutting of Ti6Al4V along with different material constitutive models. Finite element analyses for chip formation are conducted for different cutting speeds and are investigated with well-known Johnson-Cook constitutive model, a modified Johnson–Cook model known as Hyperbolic Tangent (TANH) model that emphasizes the strain softening behavior and modified Johnson-Cook constitutive model that consider temperature dependent strain hardening factor. A 2D Lagrangian finite element model is adopted for the simulation of the orthogonal cutting process and the results from the simulations such as calculated forces, chip morphologies are analyzed and are compared with the experimental results to highlight the differences. The results analysis shows that, the temperature in the secondary deformation zone is directly proportional to the cutting speed.

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Stress-Strain Curves and Modified Material Constitutive Model for Ti-6Al-4V over the Wide Ranges of Strain Rate and Temperature

Cited by 59 publications

References 23 publications

Strain-Rate-Dependent Tensile Response of Ti–5Al–2.5Sn Alloy

Strain-Rate-Dependent Tensile Response of Ti–5Al–2.5Sn Alloy

Design of custom cranial prostheses combining manufacturing and drop test finite element simulations

Influences of Cutting Speed and Material Constitutive Models on Chip Formation and their Effects on the Results of Ti6Al4V Orthogonal Cutting Simulation

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