Temperature-dependent mechanical behaviour of Australian Strathbogie granite with different cooling treatments

2017 ◽  
Vol 229 ◽  
pp. 31-44 ◽  
Author(s):  
W.G.P. Kumari ◽  
P.G. Ranjith ◽  
M.S.A. Perera ◽  
B.K. Chen ◽  
I.M. Abdulagatov
Keyword(s):  
Mechanical Behaviour ◽  
Temperature Dependent

scholarly journals Length Scale Plasticity: A Review from the Perspective of Dislocation Nucleation

2018 ◽  
Vol 56 (1) ◽  
pp. 21-61 ◽  
Author(s):  
Mahdi Bagheripoor ◽  
Robert Klassen
Keyword(s):  
Crystal Structures ◽  
Mechanical Behaviour ◽  
Dislocation Nucleation ◽  
Temperature Deformation ◽  
Dislocation Loops ◽  
Temperature Dependent ◽  
Size Dependent ◽  
Internal Sources ◽  
New Applications ◽  
Dependent Behaviour

Abstract Sub-micron and nano-size material systems and components are now regularly being fabricated for use in a wide variety of new applications. These systems exhibit mechanical properties that can be drastically different from their macroscopic counterparts and recently much work has focused on the size effects on the mechanical behaviour of materials. Although the size dependent behaviour has been observed in all of the crystal structures, the governing mechanisms have been found to be different. Different theories have been proposed to describe the size dependent behaviour of metallic samples and the governing mechanisms and it is well known that the surface plays an important role in the plasticity of small scales. Some of the theories indicate the importance of surface in nucleating dislocation and some other ones consider the surface importance as its effect on truncating dislocation loops and activation of internal sources. Moreover, recent studies have revealed that while dislocation based deformation in fcc metals is not very sensitive to temperature, deformation is strongly temperature dependent in bcc metals. The effect of orientation is more clear in the size scale behavior of hcp metals. This review covers recent literature that has focused on uniaxial compression of single crystals at the sub-micron and nanometer scale. The fundamental mechanisms governing the size dependent mechanical behaviour of different crystal structures are described. The effect of fabrication process and current experimental techniques for micro and nano-compression are studied as well.

Time and Temperature Dependent Mechanical Behaviour and Durability of Laminated Safety Glass

2004 ◽  
Vol 14 (2) ◽  
pp. 80-83 ◽  
Author(s):  
Christian Schuler ◽  
Ömer Bucak ◽  
Gert Albrecht ◽  
Vincent Sackmann ◽  
Holger Gräf
Keyword(s):  
Mechanical Behaviour ◽  
Temperature Dependent ◽  
Safety Glass

scholarly journals Cohesive Properties of Environmentally Degraded Epoxy Adhesives

2018 ◽  
Vol 3 (2) ◽  
pp. 49-56
Author(s):  
G. Viana ◽  
M. Costa ◽  
M. D. Banea ◽  
L. F. M. da Silva
Keyword(s):  
Mechanical Behaviour ◽  
Adhesive Joints ◽  
Temperature Dependent ◽  
Factors Affecting ◽  
Fuel Savings ◽  
Epoxy Adhesives ◽  
Cohesive Properties ◽  
High And Low Temperatures ◽  
Structural Adhesive

Adhesives are increasingly being used in the aerospace and automotive industries. They allow for light weight vehicles, fuel savings and reduced emissions. However, the environmental degradation of adhesive joints is a major setback in its wider implementation. Moisture degradation of adhesive joints includes plasticization, attacking of the interface, swelling of the adhesive and consequent creation of residual stresses. The main factors affecting the strength of adhesive joints under high and low temperatures are the degradation of the adhesive mechanical properties and the creation of residual stresses.To model the long term mechanical behaviour of adhesive joints, the temperature and moisture dependent properties of the adhesives must be known. However, few studies focus on the combined moisture and temperature degradation, which difficults the prediction of the long term mechanical behaviour of these joints. In this study the prediction of moisture and temperature dependent cohesive properties of a structural adhesive is analysed.

Simulation of gas quenching

2004 ◽  
Vol 120 ◽  
pp. 727-735
Author(s):  
F. Frerichs ◽  
Th. Lübben ◽  
U. Fritsching ◽  
H. Lohner ◽  
A. Rocha ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Treatment ◽  
Strain Hardening ◽  
Mechanical Behaviour ◽  
Mechanical Response ◽  
Temperature Dependent ◽  
Finite Element Program ◽  
Element Program ◽  
Gas Quenching

The prediction of mechanical behaviour of specimen during heat treatment by means of numerical simulation requires numerous modules e.g. for heat transfer and mechanical behaviour. The quality of predictions depend on the quality of the applied models within the modules. In this paper the strain hardening model used in the mechanical module will be investigated. For simulation of mechanical behaviour during gas quenching it is first of all necessary to calculate the interaction between gas and specimen. Using simulated flow field and temperature distribution within the gas, the heat transfer coefficient is calculated from computational fluid dynamics. The cooling and further the mechanical behaviour e.g. residual stresses and distortion of the specimen are simulated by a commercial Finite Element program. To investigate strain hardening it is helpful to choose in a first step a material that will not show phase transformations due to heat treatment. Therefore simulation of mechanical behaviour of austenitic cylinders (SAE30300) is investigated. The required thermo-physical properties such as thermal conductivity, density, and specific heat are taken from literature. With the exception of Poisson’s ratio the mechanical properties are measured and calculated by own investigations. For description of the temperature dependent stress strain curves the Ramberg-Osgood model is used. The simulated results are compared with experimental data in order to decide which model better describes the mechanical response, whether the kinematic or isotropic strain hardening.

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