Influence of strain rate on dilatancy and strength of Oshima granite under uniaxial compression

1981 ◽  
Vol 86 (B10) ◽  
pp. 9299-9311 ◽  
Author(s):  
Osam Sano ◽  
Ichiro Ito ◽  
Makoto Terada
Keyword(s):  
Strain Rate ◽  
Uniaxial Compression

Strain-Rate Dependent Deformation Behavior in WC-10 wt%Ni 3Al Cermet Micropillars Under Uniaxial Compression

2019 ◽  
Author(s):  
Minai Zhang ◽  
Xin Wang ◽  
Alexander D. Dupuy ◽  
Julie M. Schoenung ◽  
Xiaoqiang Li
Keyword(s):  
Strain Rate ◽  
Uniaxial Compression ◽  
Deformation Behavior ◽  
Rate Dependent

scholarly journals A Strain Rate-Dependent Damage Evolution Model for Concrete Based on Experimental Results

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Bin Xu ◽  
Xiaoyan Lei ◽  
P. Wang ◽  
Hui Song
Keyword(s):  
Strain Rate ◽  
Uniaxial Compression ◽  
Damage Evolution ◽  
Damage Model ◽  
Evolution Model ◽  
Experimental Results ◽  
Strain Rates ◽  
Compression Tests ◽  
Stress Strain ◽  
Actual Damage

There are various definitions of damage variables from the existing damage models. The calculated damage value by the current methods still could not well correspond to the actual damage value. Therefore, it is necessary to establish a damage evolution model corresponding to the actual damage evolution. In this paper, a strain rate-sensitive isotropic damage model for plain concrete is proposed to describe its nonlinear behavior. Cyclic uniaxial compression tests were conducted on concrete samples at three strain rates of 10−3s−1, 10−4s−1, and 10−5s−1, respectively, and ultrasonic wave measurements were made at specified strain values during the loading progress. A damage variable was defined using the secant and initial moduli, and concrete damage evolution was then studied using the experimental results of the cyclic uniaxial compression tests conducted at the different strain rates. A viscoelastic stress-strain relationship, which considered the proposed damage evolution model, was presented according to the principles of irreversible thermodynamics. The model results agreed well with the experiment and indicated that the proposed damage evolution model can accurately characterize the development of macroscopic mechanical weakening of concrete. A damage-coupled viscoelastic constitutive relationship of concrete was recommended. It was concluded that the model could not only characterize the stress-strain response of materials under one-dimensional compressive load but also truly reflect the degradation law of the macromechanical properties of materials. The proposed damage model will advance the understanding of the failure process of concrete materials.

scholarly journals Onset of Mechanochromic Response in the High Strain Rate Uniaxial Compression of Spiropyran Embedded Silicone Elastomers

2020 ◽  
pp. 2000449
Author(s):  
Logan S. Shannahan ◽  
Yangju Lin ◽  
James F. Berry ◽  
Meredith H. Barbee ◽  
Müge Fermen‐Coker ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Uniaxial Compression ◽  
High Strain ◽  
Silicone Elastomers

scholarly journals The mechanical properties of saline ice under uniaxial compression

1994 ◽  
Vol 19 ◽  
pp. 39-48 ◽  
Author(s):  
Gary A. Kuehn ◽  
Erland M. Schulson
Keyword(s):  
Mechanical Properties ◽  
Sea Ice ◽  
Strain Rate ◽  
Uniaxial Compression ◽  
Growth Direction ◽  
First Year ◽  
Polar Regions ◽  
Deformation And Fracture ◽  
Specimen Orientation ◽  
Ductile To Brittle Transition

Understanding the mechanical properties of saline ice is important for engineering design as well as for operations in polar regions. In order to gain understanding of the basic mechanisms of deformation and fracture, laboratory-grown columnar saline ice, representative of first-year sea ice, was tested in uniaxial compression under a variety of conditions of Strain rate (10−7to 10−1s−1), temper-aiure (−40°, −20°, −10° and −5°C) and orientation (loading vertically or horizontally: i.e. parallel or perpendicular to the growth direction). The range of strain rate spanned the ductile-to-brittle transition for every combination of temperature and specimen orientation. The results of over 250 tests are reported. Mechanical properties, failure mode and ice structure are analyzed with respect to the testing conditons. The results show that strength is dependent upon the ice structure, orientation, strain rate and temperature. During loading in the ductile regime the structure is altered (e.g. by recrystallization), whereas in the brittle regime the majority of the structural change is through cracking. The results are compared to results from the literature on both natural sea ice and laboratory-grown saline ice. Where possible, they are interpreted in terms of micromechanica] models.

Deforamtion and Fracture Behavior of Zr-Based Bulk Amorphous Metal Under Quasi-Static Compression

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1311-1317
Author(s):  
Hyung Seop Shin ◽  
Dong Kyun Ko ◽  
Sang Yeob Oh
Keyword(s):  
Strain Rate ◽  
Uniaxial Compression ◽  
Fracture Strength ◽  
Shear Bands ◽  
Indentation Load ◽  
Amorphous Metal ◽  
Uniaxial Compression Test ◽  
Static Compression ◽  
Plastic Deformation Behavior ◽  
Indentation Tests

The deformation and fracture behaviors of a bulk amorphous metal, Zr-based one ( Zr 41.2 Ti 13.8 CU 12.5 Ni 10 Be 22.5: Vitreloy), were investigated over a strain rate range (7 × 10-4~4 s -1). The uniaxial compression test and the indentation test using 3mm-diameter WC balls were carried out under the quasi-static loading condition. As a test result, at the uniaxial compression state, the fracture strength of the material was ~1,700MPa and the elastic strain limit was about 2%. The fracture strength showed a strain rate independent behavior up to 4 s-1. Using indentation tests, the plastic deformation behavior of the Zr-based BAM up to a large strain value of 15% could be achieved, even though it was the deformation under locally constrained condition. The Meyer hardness of the Zr-based BAM measured by static indentation tests was about 5 GPa and it revealed negligible strain hardening behavior. At indented sites, the plastic indentation occurred forming a crater and well-developed multiple shear bands were generated around it along the direction of 45° when the indentation load exceeded 7kN. With increasing indentation load, shear bands became dense. The fracture surface of the specimen after uniaxial compressive tests showed vein-like pattern, typical morphology of many BAMs.

The Composition Of Polymer Composite Fracture Surfaces As Studied By Xps

1995 ◽  
Vol 409 ◽  
Author(s):  
Donald A. Wiegand ◽  
James J. Pinto
Keyword(s):  
Glass Transition ◽  
Strain Rate ◽  
Uniaxial Compression ◽  
Polymer Composite ◽  
Constant Strain Rate ◽  
Sample Temperature ◽  
Fracture Properties ◽  
Fracture Surfaces ◽  
Fracture Processes

AbstractThe composition of the fracture surfaces of a composite made up of a polycrystalline organic nonpolymeric filler and a binder composed of a copolymer was studied by XPS. Because the binder and the filler of the composite each have at least one element not in common it is possible to easily distinguish between the binder and filler by XPS. A measure of the relative amounts of binder and filler on the fracture surfaces, therefore, could be made as a function of the sample temperature, T, and the strain rate during fracture. The ratio of filler to binder, F/B, increases with decreasing T at constant strain rate and is least sensitive to strain rate at T's below TG, the quasi static glass transition T. At higher T, F/B increases with strain rate at constant T. These results indicate that as the binder becomes stronger and stiffer due to a decrease in T or an increase in strain rate more of the fracture processes take place in the filler whose properties are expected to be less sensitive to T and strain rate. These results are related to the fracture properties as observed by uniaxial compression.

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