scholarly journals Characterisation of the mechanical behaviour of a polyurethane elastomer based on indentation and tensile creep experiments

2013 ◽  
Author(s):  
B. Buffel ◽  
K. Vanstreels ◽  
F. Desplentere ◽  
B. Dekeyser ◽  
I. Verpoest
Keyword(s):  
Mechanical Behaviour ◽  
Tensile Creep ◽  
Polyurethane Elastomer

A Microstructural Study of Compressive Plastic Pre-Strain Effects on Creep Damage Behaviour of Type 316H Stainless Steel

2011 ◽  
Author(s):  
Ali N. Mehmanparast ◽  
Catrin M. Davies ◽  
Mahmoud Ardakani ◽  
Kamran M. Nikbin
Keyword(s):  
Stainless Steel ◽  
Crack Growth ◽  
Mechanical Behaviour ◽  
Creep Crack Growth ◽  
Creep Damage ◽  
Tensile Creep ◽  
Compression Process ◽  
Creep Ductility ◽  
Crack Growth Behaviour ◽  
Creep Crack

Compressive plastic pre-strain induced at room temperature in type 316H stainless steel, significantly influences the tensile, creep deformation and crack growth behaviour of the material. It is known that the material is hardened after pre-strain to 8% plastic strain and thus exhibits little or no plasticity during loading of uniaxial or creep crack growth (CCG) tests. In addition pre-compression (PC) has been found to reduce the creep rupture time, creep ductility and accelerate creep crack growth rates compared to as-received (AR) (i.e. uncompressed) material. In order to understand pre-straining effects on mechanical behaviour of 316H, optical and scanning electron microscopy (SEM) studies have been performed on uncompressed and 8% pre-compressed material. Samples have been examined in three orientations (i.e. parallel and perpendicular to the pre-compression direction). Furthermore, the influence of cold pre-compression on local creep damage formation ahead of the crack tip on interrupted CCG tests on AR and PC material has been studied. The results are discussed in terms of intergranular and transgranular damage caused by the compression process and the importance of microstructural changes on the mechanical behaviour of the material in long term tests.

Dislocation Substructures Produced During Tensile, Creep, and Fatigue Deformation of Ti3Al at 700°C

1977 ◽  
Vol 35 ◽  
pp. 272-273
Author(s):  
S. M. L. Sastry
Keyword(s):  
Intermetallic Compound ◽  
Strain Rate ◽  
Tensile Creep ◽  
Slip Systems ◽  
Slip Vector ◽  
Superlattice Structure ◽  
Slip Activity ◽  
Dislocation Arrangement ◽  
Ordered Intermetallic ◽  
Tangled Dislocation

Ti3Al is an ordered intermetallic compound having the DO19-type superlattice structure. The compound exhibits very limited ductility in tension below 700°C because of a pronounced planarity of slip and the absence of a sufficient number of independent slip systems. Significant differences in slip behavior in the compound as a result of differences in strain rate and mode of deformation are reported here.Figure 1 is a comparison of dislocation substructures in polycrystalline Ti3Al specimens deformed in tension, creep, and fatigue. Slip activity on both the basal and prism planes is observed for each mode of deformation. The dominant slip vector in unidirectional deformation is the a-type (b) = <1120>) (Fig. la). The dislocations are straight, occur for the most part in a screw orientation, and are arranged in planar bands. In contrast, the dislocation distribution in specimens crept at 700°C (Fig. lb) is characterized by a much reduced planarity of slip, a tangled dislocation arrangement instead of planar bands, and an increased incidence of nonbasal slip vectors.

Tensile Creep of Y-Si3N4: II. Cavitation

1991 ◽  
Vol 49 ◽  
pp. 972-973 ◽  
Author(s):  
B. J. Hockey ◽  
S. M. Wiederhorn
Keyword(s):  
Silicon Nitride ◽  
Creep Rupture ◽  
Tensile Creep ◽  
Sintering Aids ◽  
Microstructural Changes

ATEM has been used to characterize three different silicon nitride materials after tensile creep in air at 1200 to 1400° C. In Part I, the microstructures and microstructural changes that occur during testing were described, and consistent with that description the designations and sintering aids for these materials were: W/YAS, a SiC whisker reinforced Si3N4 processed with yttria (6w/o) and alumina (1.5w/o); YAS, Si3N4 processed with yttria (6 w/o) and alumina (1.5w/o); and YS, Si3N4 processed with yttria (4.0 w/o). This paper, Part II, addresses the interfacial cavitation processes that occur in these materials and which are ultimately responsible for creep rupture.

Modeling of mechanical behaviour of HSLA low carbon bainitic steel thermomechanically processed

2003 ◽  
Vol 112 ◽  
pp. 449-452
Author(s):  
D. B. Santos ◽  
P. C.M. Rodrigues ◽  
A. B. Cota
Keyword(s):  
Mechanical Behaviour ◽  
Bainitic Steel ◽  
Low Carbon

MATHEMATICAL MODELLING OF MECHANICAL BEHAVIOUR OF CELLULOSE-BASED FIBRES EXPOSED TO GAMMA RAYS AND HYDROTHERMAL TREATMENT

2015 ◽  
Vol 14 (3) ◽  
pp. 601-605 ◽  
Author(s):  
Cristina M. Ursescu ◽  
Angelica Olaru ◽  
Teodor Malutan. ◽  
Maria Geba ◽  
Corina Malutan
Keyword(s):  
Mathematical Modelling ◽  
Hydrothermal Treatment ◽  
Gamma Rays ◽  
Mechanical Behaviour

Concrete mechanical behaviour and calcium leaching weak coupling

2006 ◽  
Vol 10 (9) ◽  
pp. 1147-1175 ◽  
Author(s):  
Laurie Lacarrièrre ◽  
Alain Sellier ◽  
Xavier Bourbon
Keyword(s):  
Mechanical Behaviour ◽  
Weak Coupling ◽  
Calcium Leaching
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