The influence of stress triaxiality on ductility of α titanium alloy in a wide range of strain rates

Kozulyn, A.A.; Skripnyak, Vladimir A.; Skripnyak, Vladimir V.

doi:10.18720/mpm.4242019_6

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…Note that crack formation depends on the stress state in the fracture zone. Moreover, the energy required for the fracture depends on the structure of the alloys and the physical mechanisms of ductile fracture [4,5,12].…”

Section: Fracture Surface Observationmentioning

confidence: 99%

“…Generalization of data on laws of deformation and fracture of alpha titanium alloys in a wide range of strain rates are useful for the engineering analysis of titanium structural elements under dynamic impacts [5][6][7][8]. The ductility and strength of titanium alloys in a wide range of strain rates depend on the grain size and distribution [9][10][11][12]. There is evidence that the ductility and fracture of the hexagonal close-packed polycrystalline metals and alloys are strongly dependent on the accumulated plastic strain and stress triaxiality [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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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: Fracture Surface Observationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Skripnyak

2020

Metals

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“…The criterion of plasticity ( 6) for damaged media proposed by Gurson and modified by Tvergaard was used for dynamic loadings simulation of HCP alloys [12][13][14]. The dynamic yield stress YHEL (T) at the Hugoniot elastic limit can be determined by formula (7) taking into account (8).…”

Section: Numerical Simulation Of Plastic Flow and Damage Evolutionmentioning

confidence: 99%

Dynamic fracture of hexagonal close packed alloys

Skripnyak¹,

Skripnyak²,

Skripnyak³

2022

8th International Congress on Energy Fluxes and Radiation Effects

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The paper presents the results of 3D numerical simulation of the processes of deformation and ductile fracture of hexagonal close packed titanium and zirconium alloys under dynamic impacts. Based on the generalization of the obtained experimental data, a version of the model is proposed that allows to adequately describe the regularities of plastic deformation during tension, the formation of zones of localization of plastic shears and the development of damage and fracture in a wide range of strain rates and spall fracture in plates under plane shock waves impacts. Proposed constitutive equation described the mechanical response of HCP titanium and zirconium alloys in a wide range of strain rates at the temperatures below temperature of phase transformation. It was shown that using of the kinetic model of the damaged medium is justified at high strain rates in complex stress conditions in the spall zone and around it.

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“…The model of a damaged medium was proposed to describe the dynamic fracture of titanium alloys VT1-0, VT5-1, VT6, which allows one to describe both spall fracture and tensile fracture at high strain rates under conditions of a complex stress state [14,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

The mechanical response of titanium alloys to dynamic impacts in a wide temperature range

Skripnyak¹,

Skripnyak²,

Iohim³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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The paper presents the results of numerical simulation mechanical behavior hexagonal close packed titanium alloys under dynamic loadings in a temperature range up to temperature of alpha-beta phase transitions. The model of a damaged medium was proposed to describe the response of titanium alloys VT1-0, VT5-1, VT6 at high strain rates and at elevated temperatures. The model takes into account the change in the contributions to the flow stress from the mechanisms of twinning and dislocation slip in the considered subgroup of hexagonal close packed alloys. Thus, it was possible to increase the accuracy of predicting of dynamic fracture of titanium under tensile loads, including the spall fracture. The model allows describing both spall fracture and tensile fracture at high strain rates under conditions of a complex stress state. The constitutive equation takes into account the change in flow stress in wide range of a cumulative plastic strain, a homologous temperature, and the logarithm of the normalized equivalent strain rate. The influence of the damage parameter, the stress state triaxiality parameter on the flow stress is taken into account by the Gurson–Tvergaard’s model. These inelastic strains occur during repeated loading of the alloy in reflected loading and unloading waves.

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The influence of stress triaxiality on ductility of α titanium alloy in a wide range of strain rates

Cited by 5 publications

References 11 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

Dynamic fracture of hexagonal close packed alloys

The mechanical response of titanium alloys to dynamic impacts in a wide temperature range

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