T.-G. Tang’s research while affiliated with China Academy of Engineering Physics and other places

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Publications (13)


Effects of the phase interface on initial spallation damage nucleation and evolution in dual phase titanium alloy
  • Article

June 2018

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32 Reads

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19 Citations

Materials Science and Engineering A

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Z. Jiang

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C. Wang

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[...]

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Y.N. Fu

Stability Analysis on the Algorithm of Constitutive Relation in Viscoplastic Materials

June 2016

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7 Reads

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2 Citations

JOURNAL OF MECHANICS

The numerical stability of the explicit precise algorithm, which was developed for the viscoplastic materials, was analyzed. It was found that this algorithm is not absolutely stable. A necessary but not sufficient condition for the numerical stability was deduced. It showed that the time step in numerical calculation should be less than a certain value to guarantee the stability of explicit precise algorithm. Through a series of numerical examples, the stability analysis on the explicit precise algorithm was proved to be reliable. At last, an iterative algorithm was presented for viscoplastic materials. Both of the theoretical and numerical results showed that the iterative algorithm is unconditionally stable and its convergence rate is rapid. In practice, the explicit precise algorithm and iterative algorithm can be combined to obtain reliable results with the minimum computing costs.


Modeling self-organization of shear bands in 304LSS

June 2016

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5 Reads

The collapse of a 304L stainless steel thick-walled cylinder (TWC) was numerically studied. A probability factor satisfied with Gauss distribution was introduced into the macroscopic constitutive relationship to provide perturbation in modeling. The initiation and propagation of multiple shear bands was successfully triggered by the probability factor in simulation. Periodical single direction spiral perturbations were adopted to characterize the features of grain rotation in the work-hardened layer. The single direction spiral pattern of multiple shear bands in TWC was successfully replicated. © 2016, Editorial Department of Transaction of Beijing Institute of Technology. All right reserved.


Experimental research on fracture of metal case under loading at high strain rate

January 2016

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10 Reads

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1 Citation

A new Dopple detection system (DPS) array and a high-speed framing camera are used to test the surface dynamics and local velocity profiles of the expansion, fracture propagation and rupture of TC4 case initiated by high explosive for the research on complex dynamic response of metal case at high-strain rate. The engineering strain at the moment of surface crack initiation and explosion product leakage is estimated through comparative analysis, and the surface crack mode and the influence of crack initiation on velocity profiles are observed. Furthermore, The fracture property of metal case is confirmed from the fracture morphologies of recovered fragments.


Effect of Strain on Microstructure Evolution of 1Cr18Ni9Ti Stainless Steel During Adiabatic Shearing

December 2015

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49 Reads

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17 Citations

Journal of Materials Engineering and Performance

Dynamic shear test was conducted on the hat-shaped specimen of the thermo-mechanical-processed 1Cr18Ni9Ti stainless steel by using the split Hopkinson pressure bar at ambient temperature. The effect of the shear strain on the microstructure evolution was investigated during adiabatic shearing. The results revealed that the development of adiabatic shear localization went through three stages, including the incubation period, the development stage, and the maturity period. TEM observations showed that the grains in the shear region were elongated, and the elongated grains were gradually evolved into equiaxed nano-grains of 100 nm as shear strain increased. The rotational dynamic recrystallization kinetics calculation showed that subgrains had sufficient time to generate an equiaxed microcrystalline structure by rotation within the deformation time. Based on the observation of the evolution of dislocations and sub-grains in the adiabatic shear region, a model of the microstructure evolution was established during the adiabatic shearing.


Experiment and numerical simulation on expansion deformation and fracture of cylindrical shell

November 2015

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15 Reads

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2 Citations

Relying on the explosively driven setting of one-end detonator initiation and using the Doppler velocimetry and high-speed framing camera, we diagnosed the expansion and fracture process of the cylindrical shell. The results obtained from our experiment provide the velocity-time history of the shell surface and its dynamic snapshots referring to expansion deformation, crack initiation and propagation, and explosion product leakage. The results from the SPH simulation are in reasonably good agreement with the experimental findings. Systemic analysis of experiments and simulations determine incident angle of shock wave for cylindrical shell, releasing angle of explosion wave, velocity and pressure profile of internal wall and deformed strain, fracture process of cylindrical shell.


Statistical study on dynamic fragmentation of multiple metal rings

April 2015

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11 Reads

Gaoya Wuli Xuebao/Chinese Journal of High Pressure Physics

An experimental platform is built to investigate the dynamic fragmentation of multiple metal rings, the layout of multiple metal rings, initiation system and principle, are detailed. Then the platform is applied to conduct the dynamic loading of pure aluminium and oxygen-free electronic copper materials, and the fractured strain and statistical distribution of reassembled fragments are obtained. It is shown that the experimental platform can achieve simultaneous and stable loading of multiple metal rings. Morever, the statistical distribution is well fitted by the Weibull function. ©, 2015, Chinese Journal of High Pressure Physics. All right reserved.


Numerical studies of explosion induced cylindrical shell fracture under different detonating modes

July 2014

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12 Reads

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4 Citations

The explosion induced fracture of metallic cylinder under different detonating modes was simulated. The results show that different detonating modes lead to significant differences on the pressure and apply work history of the cylindrical shell. A semi-decoupling numerical method was proposed to thin the mesh size of the metallic cylinder and to simulate the process of destruction of cylindrical shell under different detonating modes with higher degree of accuracy. Theoretical analysis shows that this method is reasonable. The shear bands appearing during the fracture of metallic cylindrical shell was reproduced using this semi-decoupling method.


Microscopic and macroscopic numerical simulation on interaction between stress wave and flaw

January 2014

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3 Reads

The finite element program LS-DYNA3D and the molecular dynamic method were applied to investigate the plastic zone formation, evolution process and the consequent dynamic failure behaviors under the dynamic tensile loading in a metal sheet with a preset flaw at macroscopic and microscopic levels, respectively. The calculated results show that the formation of the plastic zone stems from the stress wave-flaw and stress wave-stress wave interactions. The macroscopic and microscopic simulations represent the similar physical characteristics: the crack initiates at the front of the flaw boundary, then connects with the flaw and eventually leads to the global failure.


Asay-F-window applied to diagnostic of micro-spall phenomena

December 2013

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22 Reads

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1 Citation

Gaoya Wuli Xuebao/Chinese Journal of High Pressure Physics

Quantitative data on micro-spall fragments production from metals melted on shock or release are sparse because of diagnostic limitations. In this study, a new diagnostic technology Asay-F-Window was designed, and the mass-velocity distribution of micro-spall fragments was presented. By comparing the measured results of Asay-F-Window with those of piezoelectric pins, the reliability of Asay-F-Window technique was evaluated.


Citations (6)


... The intensity of the (110) peak of compressed irons is significantly reduced compared to that of the starting iron, likely due to the introduction of many dislocations under high strain rates. 41 ...

Reference:

Dynamic interactions of twinning, grain boundaries, and dislocation in deformed body-centered cubic iron under high strain rates
Effects of the phase interface on initial spallation damage nucleation and evolution in dual phase titanium alloy
  • Citing Article
  • June 2018

Materials Science and Engineering A

... These studies have found that the dynamic response of the metal shell under a high strain rate is closely related to the microstructure of the shell material. For example, Beetle et al. [8], Sun et al. [9], Ren et al. [10] and Sunwoo et al. [11] have observed the fracture morphology characteristics of the casings via SEM and have deduced the metal shell fracture process and/or the material phase transition process. Jin et al. [12] have used high-speed photography and metallographic analysis to research the effect of different tempering conditions on the expansion and fracture characteristics of 45 steel casings under blast loading. ...

Experimental research on fracture of metal case under loading at high strain rate
  • Citing Article
  • January 2016

... 5,6 In addition, when the metal is subjected to a decaying shock wave with high pressure, micro-spallation occurs near the surface as a result of the interaction between the incident and the reflected rarefaction wave. 7 The resulting micro-spallation region not only produces ejecta but also influences micro-jet behaviors under secondary shock loading. 8,9 Over the past few decades, extensive works have been dedicated to investigating the micro-jet behaviors of metals with machined surface under shock loading, revealing that surface morphology, the phase after shock release (solid or liquid), and the shock intensity are the most pivotal factors in ejecta production. ...

Asay-F-window applied to diagnostic of micro-spall phenomena
  • Citing Article
  • December 2013

Gaoya Wuli Xuebao/Chinese Journal of High Pressure Physics

... However, under specific erosion and wear conditions, the surface quality of 1Cr18Ni9Ti deteriorates, which can significantly reduce its service life [6]. It is particularly prone to galvanic corrosion in salt fog environments [7]. Monel alloy, a nickel-based alloy containing copper, iron, and manganese, features a unique singlephase austenitic structure that offers excellent resistance to high temperatures and highly saline seawater environments [8][9][10]. ...

Effect of Strain on Microstructure Evolution of 1Cr18Ni9Ti Stainless Steel During Adiabatic Shearing
  • Citing Article
  • December 2015

Journal of Materials Engineering and Performance

... Liu, Mingtao, and Wu, Sisi. et al [9,10] conducted numerical simulations of the shell fracture process under internal and external blast loading in the two-dimensional plane, which to some extent restored the process of the generation of the shell shear zone and the change of the fracture mode. Marinko, Cullis, and Elek et al [11][12][13] conducted numerical simulations of the fragmentation process of a naturally fragmented warhead using the finite element method and counted the parameters of fragmentation characteristics, such as velocity, fragment size, and mass distribution, and demonstrated that some numerical simulation results are in good agreement with experimental data. ...

Numerical studies of explosion induced cylindrical shell fracture under different detonating modes
  • Citing Article
  • July 2014