Stress overshoot in stress-strain curves of Zr65Al10Ni10Cu15 metallic glass

1997 ◽  
Vol 71 (6) ◽  
pp. 779-781 ◽  
Author(s):  
Yoshihito Kawamura ◽  
Tsutomu Shibata ◽  
Akihisa Inoue ◽  
Tsuyoshi Masumoto
Keyword(s):  
Metallic Glass ◽  
Stress Strain ◽  
Stress Overshoot

scholarly journals Stress Overshoot in Stress-Strain Curves of Zr65Al10Ni10Cu15 Metallic Glass

1999 ◽  
Vol 40 (4) ◽  
pp. 335-342 ◽  
Author(s):  
Yoshihito Kawamura ◽  
Tsutomu Shibata ◽  
Akihisa Inoue ◽  
Tsuyoshi Masumoto
Keyword(s):  
Metallic Glass ◽  
Stress Strain ◽  
Stress Overshoot

scholarly journals An Analytical Method for Studying the Stress-Strain Relations of Bulk Metallic Glass Matrix Composites under Tension

2018 ◽  
Vol 27 (6) ◽  
pp. 096369351802700
Author(s):  
Yunpeng Jiang
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Analytical Method ◽  
Glass Matrix ◽  
Shear Bands ◽  
Matrix Composites ◽  
Stress Strain ◽  
Glass Matrix Composites ◽  
Softening Stage

In this contribution, an analytical model was formulated to predict the tensile stress-strain relations of bulk metallic glass matrix composites (BMGCs) based on Weng's theoretical frame for dual-ductile composites. For in-situ BMGCs, BMG matrix also exhibits the elastic-plastic deform response as well as the dendrite phases during the stretching. The shear bands are regarded as Mode-I cracks, and whereby the strain-softening stage in the stress-strain curves can be well reflected. Furthermore, multi-particle representative volume element based FEM modelling was employed to clearly explain the failure mechanisms in BMGCs as a necessary complement. The predictions are in reasonable agreement with the experimental results. The presented analytical method will shed some light on optimizing the microstructures, and is of convenience in the engineering applications.

A Fictive Stress Model Calculation of Stress-Overshoot: A Nonlinear Viscoelastic Behavior in Metallic Glass

2000 ◽  
Vol 39 (Part 1, No. 4A) ◽  
pp. 1808-1811 ◽  
Author(s):  
Ho-Sou Chen ◽  
Hidemi Kato ◽  
Akihisa Inoue
Keyword(s):  
Metallic Glass ◽  
Model Calculation ◽  
Viscoelastic Behavior ◽  
Stress Model ◽  
Stress Overshoot ◽  
Nonlinear Viscoelastic ◽  
Nonlinear Viscoelastic Behavior

A Modified Fictive Stress Model for Zr55Al10Ni5Cu30 Bulk Metallic Glass in Supercooled Liquid Region by Introducing a Time Relaxation Factor

2014 ◽  
Vol 893 ◽  
pp. 449-456
Author(s):  
Zhi Hui Ma ◽  
Hong Juan Su ◽  
Xiang Huai Dong
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Liquid Region ◽  
Stress Model ◽  
Stress Strain ◽  
Time Relaxation ◽  
Relaxation Factor ◽  
Nonlinear Viscoelastic

Linear and nonlinear viscoelastic behaviors of a Zr55Al10Ni5Cu30bulk metallic glass are investigated through experiments and described by the fictive stress model. Systematic deviations between the predicted stress-strain curves by fictive stress model and by the experimental results were found. In order to describe the flow stress curves of the Zr55Al10Ni5Cu30BMG at different temperatures and strain rates in the supercooled liquid region more precisely, the fictive stress model was modified. The parameters of the model were optimized by the genetic algorithm, and a time relaxation factor Z' was introduced. The comparisons of the predicted compressive stress-strain curves and extrusion load-punch stroke curve by the modified fictive stress model with the experimental data show good agreements.

In-Situ Neutron Scattering Measurement of Stress-Strain Behavior of a Bulk Metallic Glass

2007 ◽  
Vol 39 (8) ◽  
pp. 1942-1946 ◽  
Author(s):  
Timothy Wilson ◽  
Bjørn Clausen ◽  
Thomas Proffen ◽  
Jennifer Elle ◽  
Don Brown
Keyword(s):  
Metallic Glass ◽  
Neutron Scattering ◽  
Bulk Metallic Glass ◽  
Stress Strain ◽  
Strain Behavior ◽  
Scattering Measurement

Determining Stress-Strain Behavior of Zr60Cu10Al15Ni15 Bulk Metallic Glass Using Object Oriented Finite Element Analysis

2017 ◽  
Vol 29 ◽  
pp. 1-8 ◽  
Author(s):  
Ketul Arvindbhai Patel ◽  
Ganesh R. Karthikeyan ◽  
S. Vincent
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Metallic Glass ◽  
Strain Analysis ◽  
Indentation Test ◽  
Object Oriented ◽  
Stress Strain ◽  
Element Analysis ◽  
Strain Behavior

Determining mechanical properties of Bulk Metallic Glasses (BMGs) requires synthesizing of the alloys in bulk form. However obtaining metallic glass in bulk form is quite challenging due to its tendency towards crystallization. In such circumstances it is beneficial to determine the mechanical properties of materials using finite elemental analysis of microstructures. Thus, in the present investigation, using Object Oriented Finite Element Analysis (OOF2) software package, Stress-Strain analysis has been carried out on Zr60Cu10Al15Ni15 BMG to determine such mechanical properties. Specimen of Zr60Cu10Al15Ni15 BMG exhibiting three microstructurally distinct regions amorphous, partial crystalline and crystalline regions was used for this analysis. The Stress-Strain relationship have been estimated for each of the three distinct phases and the results are validated by determining the Modulus of Elasticity for all the phases and comparing it with the available experimental results from Nano-indentation test.

scholarly journals Effects of annealing and specimen geometry on dynamic compression of a Zr-based bulk metallic glass

2007 ◽  
Vol 22 (2) ◽  
pp. 389-401 ◽  
Author(s):  
George Sunny ◽  
John Lewandowski ◽  
Vikas Prakash
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Split Hopkinson Pressure Bar ◽  
Peak Stress ◽  
Specimen Geometry ◽  
Hopkinson Pressure Bar ◽  
Stress Strain ◽  
Split Hopkinson ◽  
Pressure Bar

High strain-rate compression experiments were performed with a split-Hopkinson pressure bar (SHPB) at 500–4000/s on cylindrical samples of a Zr-based bulk metallic glass (LM-1) in both the fully amorphous and annealed conditions. The effects of changes to the specimen geometry (i.e., L/D ratio) and the material heat treatment [i.e., annealing versus amorphous (as-received)], on the peak stress, strain-to-failure, and failure behavior were determined with the aid of an in situ video obtained by using a high-speed digital camera in conjunction with the split-Hopkinson pressure bar (SHPB). Examination of the in situ video recordings and light optical microscopy showed that the failed samples revealed preferential failure initiating at the sample ends due to stress concentration at the sample-insert interface. A new insert design was developed using transient, elastic-plastic finite-element simulations to reduce the effects of these stress concentrations. SHPB testing, combined with in situ video, subsequently revealed that this new experimental configuration promoted failure within the gage length and away from the sample ends in the samples tested. Significant effects of specimen geometry, insert design, and annealing on the apparent values of the peak stress, strain-to-failure, and fracture behavior were exhibited.

STRESS-STRAIN RELATIONSHIP OF ZR55AL10NI5CU30 METALLIC GLASS ANALYZED BY 3D IMAGES ON SPHERICAL INDENTS

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2453-2458 ◽  
Author(s):  
YUN-HEE LEE ◽  
JONG SEO PARK ◽  
HAE MOO LEE ◽  
SEUNG HOON NAHM
Keyword(s):  
Metallic Glass ◽  
Metallic Glasses ◽  
Three Dimensional ◽  
Processing Technique ◽  
Image Processing Technique ◽  
Polished Surface ◽  
Flow Properties ◽  
Stress Strain ◽  
Strain Relationship ◽  
Relationship Of

Mechanically polished surface of Zr 55 Al 10 Ni 5 Cu 30 metallic glass was indented with a rigid ball 0.5 mm in diameter and its corresponding load-depth curve was recorded automatically. Although a stress-strain relationship beneath the indenter can be analyzed from the raw indentation curve, the current analysis developed for crystalline solids can mislead erroneous properties because it does not consider significant material pile-ups in amorphous metallic glasses. Thus, we proposed a novel indent image processing technique for characterizing the contact and flow properties in the metallic glasses; the contact area was measured by differentiating a three-dimensional indent morphology digitized by a surface profiler and a surface-stretching strain was newly defined in order to estimate the flow properties. Finally, the work-hardening index estimated was about 0.05, comparable with the typical value measured from uniaxial compression in the Zr -based metallic glass.

Elastic strain effects on catalysis of a PdCuSi metallic glass thin film

2015 ◽  
Vol 17 (3) ◽  
pp. 1746-1754 ◽  
Author(s):  
Yiyi Yang ◽  
Tuhina Adit Maark ◽  
Andrew Peterson ◽  
Sharvan Kumar
Keyword(s):  
Thin Film ◽  
Metallic Glass ◽  
Compressive Stress ◽  
Elastic Strain ◽  
Uniaxial Tensile ◽  
Glass Film ◽  
Stress Strain ◽  
Strain Effects

Electrochemical catalytic response of a palladium-based (Pd–Cu–Si) metallic glass film to mechanically imposed uniaxial tensile and compressive stress–strain.

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