Ductile fracture of bulk metallic glass Zr 50 Cu 40 Al 10 under high strain-rate loading

2016 ◽  
Vol 651 ◽  
pp. 848-853 ◽  
Author(s):  
L. Lu ◽  
C. Li ◽  
W.H. Wang ◽  
M.H. Zhu ◽  
X.L. Gong ◽  
...  
Keyword(s):  
Metallic Glass ◽  
High Strain Rate ◽  
Strain Rate ◽  
Ductile Fracture ◽  
Bulk Metallic Glass ◽  
High Strain ◽  
Strain Rate Loading

Impacting behavior of bulk metallic glass powder at an abnormally high strain rate during kinetic spraying

2007 ◽  
Vol 449-451 ◽  
pp. 911-915 ◽  
Author(s):  
Sanghoon Yoon ◽  
Changhee Lee ◽  
Hanshin Choi ◽  
Hwíjun Kim ◽  
Jungchan Bae
Keyword(s):  
Metallic Glass ◽  
High Strain Rate ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Glass Powder ◽  
High Strain ◽  
Kinetic Spraying

Dynamic fracture under impact and high-strain-rate loading

1995 ◽  
Vol 73 (5-6) ◽  
pp. 315-323 ◽  
Author(s):  
M. J. Worswick ◽  
J. A. Clarke ◽  
R. J. Pick
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Ductile Fracture ◽  
Damage Evolution ◽  
High Strain ◽  
Yield Criterion ◽  
Damage And Fracture ◽  
Split Hopkinson ◽  
Strain Rate Loading ◽  
Dynamic Loading Conditions

A constitutive model based on a pressure-dependent yield criterion is used to predict damage evolution and ductile fracture under dynamic loading conditions. The model predicts the influence of porosity on plastic flow in metals and the nucleation, growth, and coalescence of internal microvoids to cause ductile fracture. The constitutive equations have been implemented in the DYNA2D finite-element code and have been used to simulate three high-strain-rate experiments: (i) the symmetric Taylor cylinder impact, (ii) the plate impact, and (iii) the tensile split Hopkinson bar experiments. In each case, the model is shown to capture qualitatively the damage and fracture within the experiments modelled. Comparison with recent symmetric Taylor impact experiments on leaded brass suggests that the model over-predicts the rate of damage evolution under the high-strain rate, high-triaxiality conditions associated with impact.

High-strain-rate dynamic mechanical behavior of a bulk metallic glass composite

2008 ◽  
Vol 23 (4) ◽  
pp. 998-1008 ◽  
Author(s):  
Morgana Martin ◽  
Laszlo Kecskes ◽  
Naresh N. Thadhani
Keyword(s):  
Metallic Glass ◽  
High Strain Rate ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
High Speed ◽  
High Strain ◽  
Microstructural Analysis ◽  
Surface Velocity ◽  
Fracture Characteristics ◽  
Transient Deformation

The high-strain-rate mechanical properties, deformation mechanisms, and fracture characteristics of a bulk metallic glass (BMG)-matrix composite, consisting of an amorphous Zr57Nb5Cu15.4Ni12.6Al10 (LM106) matrix with crystalline tungsten reinforcement particles, were investigated using gas gun anvil-on-rod impact experiments instrumented with velocity interferometry (VISAR) and high-speed digital photography. The time-resolved elastic-plastic wave propagation response obtained through VISAR and the transient deformation states captured with the camera provided information about dynamic strength and deformation modes of the composite. Comparison of experimental measurements with AUTODYN-simulated transient deformation profiles and free surface velocity traces allowed for validation of the pressure-hardening Drucker–Prager model, which was used to describe the deformation response of the composite. The impacted specimens recovered for post-impact microstructural analysis provided further information about the mechanisms of dynamic deformation and fracture characteristics. The overall results from experiments and modeling revealed a strain to failure of ∼45% along the length and ∼7% in area, and the fracture initiation stress was found to decrease with increasing impact velocity because of the negative strain-rate sensitivity of the BMG.

Results From a Novel Insert Design for High Strain-Rate Compression of a Bulk Metallic Glass

2006 ◽  
Author(s):  
George P. Sunny ◽  
Vikas Prakash ◽  
John P. Lewandowski
Keyword(s):  
Metallic Glass ◽  
High Strain Rate ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Failure Modes ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Strain Rate Compression ◽  
Effects Of Stress

Liquidmetal-1 (LM-1, Zr41.25Ti13.75Cu12.5Ni10Be22.5) is a bulk metallic glass that can be processed in large thicknesses (e.g. 10 mm) because of its low critical cooling rate (e.g. 1 K/s). Like other bulk metallic glasses, this material exhibits near theoretical strength and large elastic strains (~2%) under quasi-static loading conditions. In this work, the Split-Hopkinson Pressure Bar (SHPB) was employed to perform high strain-rate compression tests on annealed LM-1. An ultrahigh-speed camera was also employed to perform in-situ video of the deformation process of the experiments, and the macroscopic fracture behavior was examined after testing. In addition, a new insert design was developed to reduce the effects of stress concentrations on the specimen. SHPB testing, combined with in-situ video, was performed on as-cast LM-1 using this new experimental configuration to determine the failure modes. The results of these experiments are compared to previous results to understand better the effects of stress concentration on high strain-rate behavior of bulk metallic glass.

HIGH STRAIN RATE LOADING OF ZIRCALOY

1985 ◽  
Vol 46 (C5) ◽  
pp. C5-511-C5-516
Author(s):  
A. Kobayashi ◽  
S. Hashimoto ◽  
Li-lih Wang ◽  
M. Toba
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Strain Rate Loading
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