High‐temperature cylindrical specimen grip for biaxial loading

1996 ◽  
Vol 67 (5) ◽  
pp. 1989-1992
Author(s):  
P. Lipetzky ◽  
G. Dvorak ◽  
N. Stoloff
Keyword(s):  
High Temperature ◽  
Biaxial Loading ◽  
Cylindrical Specimen ◽  
Specimen Grip

High Temperature Creep Damage Under Biaxial Loading—Part II: Model and Simulations

1990 ◽  
Vol 112 (4) ◽  
pp. 450-455 ◽  
Author(s):  
F. Trivaudey ◽  
P. Delobelle
Keyword(s):  
High Temperature ◽  
Biaxial Loading ◽  
Creep Damage ◽  
Internal Variables ◽  
Anisotropic Damage ◽  
High Temperature Creep ◽  
Viscoplastic Model ◽  
Temperature Creep ◽  
Complete Formulation ◽  
Damage Law

The inadequacies, in describing the high temperature creep damage of two industrial alloys (Part I) with a model where the anisotropic damage variable D depends only on time have been pointed out. It is therefore proposed to introduce directly strain rate in the damage law. This rule is then integrated into a unified viscoplastic model, with internal variables, that has been developed elsewhere. Some numerical simulations obtained with the complete formulation are reported and, in general, yield acceptable results.

High Temperature Creep Damage Under Biaxial Loading—Part I: Experiments

1990 ◽  
Vol 112 (4) ◽  
pp. 442-449 ◽  
Author(s):  
F. Trivaudey ◽  
P. Delobelle
Keyword(s):  
High Temperature ◽  
Principal Stress ◽  
Biaxial Loading ◽  
Equivalent Stress ◽  
Creep Damage ◽  
Maximum Principal Stress ◽  
High Temperature Creep ◽  
Temperature Creep ◽  
Shear Component ◽  
Biaxial Tests

The respective influences of the Von-Mises equivalent stress and of the maximum principal stress on the high temperature creep damage of two industrial alloys (INCO 718 and 17–21 SPH stainless steel) are pointed out in a quantitative way through tensile-torsion biaxial tests. Through inversions of the shear component, the important part taken by the principal direction corresponding to the maximum principal stress is also shown. Opposite results are observed according to whether the alloy suffers cyclic hardening as 17-12 SPH does or cyclic softening which is the case of INCO 718. These results are supported by metallographic observations. They demand an anisotropic form for the damage variable D, while besides a time dependence kinetics equation must include the part taken by the strain. The bases of the formulation are described in Part II.

Rhombohedral-cubic phase transition characterization of (Pb,Ge)Te using high-temperature XRD

2008 ◽  
Vol 23 (2) ◽  
pp. 137-140 ◽  
Author(s):  
J. Sariel ◽  
I. Dahan ◽  
Y. Gelbstein
Keyword(s):  
High Temperature ◽  
Cylindrical Specimen ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Continuous Transformation ◽  
X Ray ◽  
High Temperature Xrd ◽  
Powder Samples ◽  
Powder Metallurgy Approach

Rhombohedral-cubic transformation in Bi2Te3 doped-Pb1−xGexTe alloys is presented. Samples of Bi2Te3 doped Pb1−xGexTe were prepared by powder metallurgy approach. These powder samples were examined by high-temperature X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive spectroscopy. A bulk (pressed powder) cylindrical specimen was used for dilatometery characterizations. According to the XRD examinations it seems that upon increasing the temperatures a continuous transformation occurs from the rhombohedral to the cubic phase, accompanied by the formation of a small amount of the phase Ge0.74Pb3.26Te4.

scholarly journals Effects Of Biaxial Loading On The High Temperature Behaviour Of Concrete

1986 ◽  
Vol 1 ◽  
pp. 281-290 ◽  
Author(s):  
K. Kordina ◽  
C. Ehm ◽  
U. Schneider
Keyword(s):  
High Temperature ◽  
Biaxial Loading ◽  
Temperature Behaviour

Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

1973 ◽  
Vol 31 ◽  
pp. 184-185
Author(s):  
M.S. Grewal ◽  
S.A. Sastri ◽  
N.J. Grant
Keyword(s):  
High Temperature ◽  
Nickel Alloys ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Mechanical Processing ◽  
Uniform Dispersion ◽  
Oxide Particles ◽  
Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

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