Strain Hardening During Uniaxial Compression of Polymer Glasses

2014 ◽  
Vol 3 (8) ◽  
pp. 784-787 ◽  
Author(s):  
Panpan Lin ◽  
Shiwang Cheng ◽  
Shi-Qing Wang
Keyword(s):  
Strain Hardening ◽  
Uniaxial Compression ◽  
Polymer Glasses

Strain hardening and microstructure evolution during uniaxial compression of ultrafine grained zirconium at temperatures of 4.2–300 K

2011 ◽  
Vol 37 (7) ◽  
pp. 609-617 ◽  
Author(s):  
A. V. Podolskiy ◽  
S. N. Smirnov ◽  
E. D. Tabachnikova ◽  
V. Z. Bengus ◽  
A. N. Velikodny ◽  
...  
Keyword(s):  
Strain Hardening ◽  
Uniaxial Compression ◽  
Microstructure Evolution ◽  
Ultrafine Grained

Geometric Instabilities in Isotropic Plastic Solids Under Increasing Uniaxial Compression

1972 ◽  
Vol 39 (2) ◽  
pp. 431-437 ◽  
Author(s):  
J. B. Newman
Keyword(s):  
Shear Stress ◽  
Strain Hardening ◽  
Uniaxial Compression ◽  
Maximum Shear Stress ◽  
Three Dimensional ◽  
Rigid Plastic ◽  
Axisymmetric Mode ◽  
Plastic Materials ◽  
Compressive Flow ◽  
Shanley Theory

This analysis seeks three-dimensional instabilities of uniaxial compressive flow in isotropic, strain-hardening, rigid-plastic materials of the Mises and maximum shear stress types. No instabilities are found for Mises materials. Maximum shear materials display axisymmetric, “deflectional”, and “higher-order” buckling. For increasingly slender specimens, the deflectional buckling process merges into that of the Shanley theory. The axisymmetric mode raises the possibility that instabilities contribute to the double axial bulging of ductile compression specimens reported by Na´da´i.

Large Strain Mechanical Behavior of Poly(methyl methacrylate) (PMMA) Near the Glass Transition Temperature

2006 ◽  
Vol 128 (4) ◽  
pp. 559-563 ◽  
Author(s):  
G. Palm ◽  
R. B. Dupaix ◽  
J. Castro
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methyl Methacrylate ◽  
Mechanical Behavior ◽  
Strain Hardening ◽  
Uniaxial Compression ◽  
Large Strain ◽  
Strain Rates ◽  
Poly Methyl Methacrylate

The mechanical behavior of amorphous thermoplastics, such as poly(methyl methacrylate) (PMMA), strongly depends on temperature and strain rate. Understanding these dependencies is critical for many polymer processing applications and, in particular, for those occurring near the glass transition temperature, such as hot embossing. In this study, the large strain mechanical behavior of PMMA is investigated using uniaxial compression tests at varying temperatures and strain rates. In this study we capture the temperature and rate of deformation dependence of PMMA, and results correlate well to previous experimental work found in the literature for similar temperatures and strain rates. A three-dimensional constitutive model previously used to describe the mechanical behavior of another amorphous polymer, poly(ethylene terephthalate)-glycol (PETG), is applied to model the observed behavior of PMMA. A comparison with the experimental results reveals that the model is able to successfully capture the observed stress-strain behavior of PMMA, including the initial elastic modulus, flow stress, initial strain hardening, and final dramatic strain hardening behavior in uniaxial compression near the glass transition temperature.

Strain Hardening Induced by Uniaxial Compression on Au@Pd Nanocubes

2020 ◽  
Author(s):  
Juan Andres de la Rosa Abad ◽  
Alejandra Londoño-Calderon ◽  
Sergio Alexis Paz ◽  
Eduardo Bringa ◽  
German Soldano ◽  
...  
Keyword(s):  
Strain Hardening ◽  
Uniaxial Compression

Microstructure Evolution and Properties of Ti-6Al-4V Alloy Doped with Fe and Mo during Deformation at 800°C

2018 ◽  
Vol 385 ◽  
pp. 144-149 ◽  
Author(s):  
Denis Klimenko ◽  
Maxim Ozerov ◽  
Santharam Suresh ◽  
Nikita Stepanov ◽  
Mikhail A. Tikhonovsky ◽  
...  
Keyword(s):  
Steady State ◽  
Mechanical Behavior ◽  
Titanium Alloys ◽  
Strain Hardening ◽  
Uniaxial Compression ◽  
Microstructure Evolution ◽  
Steady State Flow ◽  
Globular Microstructure ◽  
Flow Response ◽  
Alpha Beta

Microstructure evolution and mechanical behavior of alpha/beta Ti-6Al-4V and Ti-6Al-4V-0.75Mo-0.5Fe titanium alloys during uniaxial compression to a height strain of 70% was studied. The plastic-flow response for both alloys is characterized by successive stages of strain hardening, flow softening, and steady-state flow. During compression the lamellae spheroidized to produce a globular microstructure with higher rate of globularization in Ti-6Al-4V-0.75Mo-0.5Fe. The globularization kinetics in Ti-6Al-4V-0.75Mo-0.5Fe was also found to be much faster than that in Ti-6Al-4V. This difference can be partially associated with different interphase energy due to doping of β-stabilizing elements.

scholarly journals Failure behaviour and acoustic emission characteristics of different rocks under uniaxial compression

2019 ◽  
Author(s):  
Zhaohui Wang ◽  
Jiachen Wang ◽  
Shengli Yang ◽  
Lianghui Li ◽  
Meng Li
Keyword(s):  
Acoustic Emission ◽  
Bearing Capacity ◽  
Strain Hardening ◽  
Uniaxial Compression ◽  
Strength Increase ◽  
Evolutionary Trend ◽  
Sudden Increase ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Ae Energy

Abstract In the present study, mechanical behaviour of three types of rocks has been investigated under uniaxial compression. The stress–strain responses of the tested rocks are composed of four regions: the compaction stage; elastic stage; strain hardening stage and strain softening stage. The elastic modulus and uniaxial compressive strength increase in order from the result of the coal to the mudstone and then to the sandstone, while the Poisson ratio shows a reverse order. In coal and mudstone, volumetric dilation behaviour vanishes gradually with an increase in damage degree, while it remains stable in the sandstone where the strain hardening behaviour is less obvious. Regarding acoustic emission (AE) characteristics, AE hit and AE energy show a similar evolutionary trend in the loading process. A sudden increase in AE energy is accompanied with drastic drop or local fluctuation in the load-bearing capacity of the rock while AE hit fails in predicting such variation in the load-bearing capacity. A quiet stage of AE signal prior to the peak stress is captured, which can be taken as a precursor for rock failure. Failure pattern of the coal, mudstone and sandstone varies from shear faulting to tension-shear mixed fracturing and then to axial splitting, which is in good accordance with that deduced from AE location analysis.

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