Dynamic shear characteristics of titanium alloy Ti-6Al-4V at large strain rates by the split Hopkinson pressure bar test

Zhou, Tianfeng; Wu, Junjie; Che, Jiangtao; Wang, Ying; Wang, Xibin

doi:10.1016/j.ijimpeng.2017.06.007

Cited by 62 publications

(13 citation statements)

References 18 publications

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“…1. The design of hat-shaped specimens have advantages to reveal the ASB evolution in metals and alloys [30,38,40], compared to other methods for dynamic shear loading [32,42]. Due to the nature of laminates, flatted specimens were used in the present study for dynamic shear testing, thus cylindrical maraging steel holders with ultra-high strength were also used to ensure a nearly pure shear deformation by constraining the lateral expansion of two legs and control the specific shear displacement to "frozen" the microstructure by changing the height of the holders.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

“…The mechanical properties and the deformation mechanisms in bimetallic laminates have been widely studied and well understood under quasi-static conditions [16][17][18][19][20][21][22][23][24][25][26], while their plastic deformation behaviors under high strain rates are still unclear until now. As we know, the flow and facture behavior of materials under impact loading should be dramatically different from that under quasi-static conditions since thermal softening induced by adiabatic heating, strain rate effect and inertia effect can significantly affect the plastic deformation and fracture mechanisms [30][31][32][33][34][35] [36][37][38][39][40][41][42][43]. Typically, the metals and alloys with high dynamic yield strength have low critical strain for onset of adiabatic shear band (ASB) and low impact toughness, in other words, there still exits a strengthtoughness contradiction under dynamic loading for metal and alloys with homogeneous microstructures.…”

Section: Introductionmentioning

confidence: 99%

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Superior mechanical properties and deformation mechanisms of heterogeneous laminates under dynamic shear loading

Yuan

Yang

et al. 2019

Materials Science and Engineering: A

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High-strain rate response of low C steel/304 stainless steel (SS) laminates was characterized by hat-shaped specimen using Hopkinson-bar technique at a strain rate of about 7×10 4 s-1. Better dynamic shear properties were observed in the laminates, compared to the plain low C steel plate and the plain 304 SS plate. The laminates were found to postpone the nucleation of adiabatic shear band (ASB) in the hard zone and to delay the propagation of ASB from the hard zone to the soft zone. The conventional maximum stress criterion on ASB nucleation was found not valid any more in the laminates. The hardness difference between the hard zone and the soft zone in the laminates was found to have great influence on the patterns of ASB evolution. Nanotwins were formed in the 304 SS and grain refinement was observed in the martensite low C steel for strain hardening under dynamic shear loading. The mechanical incompatibility across the interfaces was observed to result in strain gradient and geometrically necessary dislocations at the interfaces under dynamic shear loading, contributing to extra strain hardening. The extra hardening was also found to be triggered at the propagation tip of ASB, which helps for achieving better dynamic ductility in the laminates.

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Section: Materials and Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Superior mechanical properties and deformation mechanisms of heterogeneous laminates under dynamic shear loading

Yuan

Yang

et al. 2019

Materials Science and Engineering: A

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“…Second, the low stress triaxiality in a well designed shear specimen suppresses damage initiation and propagation (Bai and Wierzbicki, 2008;Bao and Wierzbicki, 2004) to enable characterization of a material at large plastic strain (Dorogoy et al, 2015;Dorogoy and Rittel, 2017;Rittel et al, 2002). Third, the thickness of the specimen shear zone can be designed to be so small that very high strain rates in the range of 10 4 s À1 to 10 5 s À1 are possible (Klepaczko, 1994;Klepaczko et al, 1999;Xu et al, 2018;Zhou et al, 2017). In addition, stress state, represented by stress triaxiality g and Lode angle parameter h, has been shown to influence the deformation and failure behavior of materials significantly (Bai and Wierzbicki, 2008;Dunand and Mohr, 2017;Fras et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

A novel technique for dynamic shear testing of bulk metals with application to 304 austenitic stainless steel

Jia

Rusinek

Pesci

et al. 2020

International Journal of Solids and Structures

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This paper describes a new single-shear specimen (SSS) and method to characterize the dynamic shear behavior of bulk metals using a traditional Split Hopkinson Pressure Bar (SHPB). By this method, the shear behavior of materials can be tested conveniently over a wide range of strain rates within 10 5 s À1 . This technique was applied to a 304 austenitic stainless steel (ASS) under shear strain rates from 0.001 s À1 to 38700 s À1 at room temperature. Based on finite element (FE) simulations, it was found that the deformation of the specimen shear zone was dominated by shear stress/strain components. Stress state parameters represented by stress triaxiality g and Lode angle parameter h were found very close to zero, indicating a deformation mode of simple shear. Besides, an obvious gap existed between the local deformation behavior in the specimen shear zone and the macroscopic stress-strain relations measured by the strain gauges on the SHPB bars. A correction coefficient method was adopted to extract the real shear behavior from the experimentally obtained force-displacement data. Through comparisons between the tested and simulated stress-strain curves, a good agreement was obtained. dynamic compression tests of 304 ASS under strain rate of 2500 s À1 at room temperature. The Young's modulus isE = 210GPa and Poisson's ratiom = 0.33. The yield stress r 0 was taken as 1050 MPa and the strain hardening behavior is described by the Voce type law (1948) r ¼ r 0 þ Að1 À e ÀCep Þ with values of A and C being 888 and 3.14, respectively.

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“…So it is necessary to consider not only strain, strain rate and temperature, but also the material's special loading conditions in the development of the constitutive models. Therefore, some modified J-C constitutive models considering adiabatic temperature rise, extremely high strain rate, and evolution of dislocations have been established accordingly [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

On the Development of Material Constitutive Model for 45CrNiMoVA Ultra-High-Strength Steel

Xie

Gao

et al. 2019

Metals

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For the implementation of simulations for large plastic deformation processes such as cutting and impact, the development of the constitutive models for describing accurately the dynamic plasticity and damage behaviors of materials plays a crucial role in the improvement of simulation accuracy. This paper focuses on the dynamic behaviors of 45CrNiMoVA ultra-high-strength torsion bar steel. According to investigation of the Split-Hopkinson pressure bar (SHPB) and Split-Hopkinson tensile bar (SHTB) tests at different strain rate and different temperatures, 45CrNiMoVA ultra-high-strength steel is characterized by strain hardening, strain-rate hardening and thermal softening effects. Based on the analysis on the mechanism of the experimental results and the limitation of classic Johnson-Cook (J-C) constitutive model, a modified J-C model by considering the phase transition at high temperature is established. The multi-objective optimization fitting method was used for fitting model parameters. Compared with the classic J-C constitutive model, the fitting accuracy of the modified J-C model significantly improved. In addition, finite element simulations for SHPB and SHTB based on the modified J-C model are conducted. The SHPB stress-strain curves and the fracture morphology of SHTB samples from simulations are in good agreement with those from tests.

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Dynamic shear characteristics of titanium alloy Ti-6Al-4V at large strain rates by the split Hopkinson pressure bar test

Cited by 62 publications

References 18 publications

Superior mechanical properties and deformation mechanisms of heterogeneous laminates under dynamic shear loading

Superior mechanical properties and deformation mechanisms of heterogeneous laminates under dynamic shear loading

A novel technique for dynamic shear testing of bulk metals with application to 304 austenitic stainless steel

On the Development of Material Constitutive Model for 45CrNiMoVA Ultra-High-Strength Steel

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