Anisotropic Creep Behaviour of Bridgman Notch Specimens

2005 ◽  
Vol 219 (3) ◽  
pp. 163-175 ◽  
Author(s):  
T H Hyde ◽  
I A Jones ◽  
S Peravali ◽  
W Sun ◽  
J G Wang ◽  
...  
Keyword(s):  
Cross Section ◽  
Bulk Material ◽  
Creep Behaviour ◽  
Practical Application ◽  
Material Anisotropy ◽  
Yield Model ◽  
Anisotropic Parameter ◽  
Creep Analysis ◽  
Minimum Cross Section ◽  
Anisotropic Creep

A series of finite element anisotropic creep analyses of a Bridgman notch specimen have been performed. The anisotropic creep analysis is based on Hill's anisotropic yield model and the Norton creep law. An anisotropic parameter, p, is defined in order to quantify the degree of bulk material anisotropy which exists in a weld metal. The effects of p and the Norton stress exponent, n, on the stationary-state stresses, at the minimum cross-section of the notch, are presented. The material constants were chosen to include the practical range for engineering materials. Indications of the practical application of anisotropic analyses to welds are given.

scholarly journals Partial factors for cross-section resistance of elements in steel structures

2013 ◽  
Vol 12 (2) ◽  
pp. 213-220
Author(s):  
Marian Giżejowski ◽  
Zbigniew Stachura
Keyword(s):  
Cross Section ◽  
Steel Structures ◽  
Partial Cross Section ◽  
Live Load ◽  
Practical Application ◽  
Limit States ◽  
Resistance Factors ◽  
Safety Requirements ◽  
Permanent Load ◽  
Load Component

Issues related to safety requirements for steel elements subjected to different stress resultants in reference to limit states design philosophy according to Structural Eurocodes PN-EN and national codes PN-B are dealt with in the paper. The calibration of partial cross-section resistance factors is discussed on the basis of elements of steel floor structures where the permanent load component and the live load component of variable actions are the only components of load combinations. Final conclusions for their practical application in the codification process are formulated and values of partial factors for cross section resistance are proposed.

Anisotropic creep behaviour

1997 ◽  
pp. 338-376
Author(s):  
M. W. Darlington ◽  
D. W. Saunders
Keyword(s):  
Creep Behaviour ◽  
Anisotropic Creep

Creep Analysis of Functionally Graded Material Thick-Walled Cylinder

2013 ◽  
Vol 315 ◽  
pp. 867-871 ◽  
Author(s):  
Saifulnizan Jamian ◽  
Hisashi Sato ◽  
Hideaki Tsukamoto ◽  
Yoshimi Watanabe
Keyword(s):  
Cross Section ◽  
Volume Fraction ◽  
Rectangular Cross Section ◽  
Functionally Graded ◽  
Graded Materials ◽  
Incremental Approach ◽  
Creep Analysis ◽  
Graded Material ◽  
Ring Elements ◽  
Walled Cylinder

In this paper, creep analysis for a thick-walled cylinder made of functionally graded materials (FGMs) subjected to thermal and internal pressure is carried out. The structure is replaced by a system of discrete rectangular cross-section ring elements interconnected along circumferential nodal circles. The property of FGM is assumed to be continuous function of volume fraction of material composition. The creep behavior of the structures is obtained by the use of an incremental approach. The obtained results show that the property of FGM significantly influences the stress distribution along the radial direction of the thick-walled cylinder as a function of time.

scholarly journals Influence of standard recommendations for the calculation of the column-base connection by socket according to ABNT NBR 9062:2006

2017 ◽  
Vol 10 (1) ◽  
pp. 244-259
Author(s):  
R. PIERALISI ◽  
R. D. MACHADO
Keyword(s):  
Comparative Analysis ◽  
Cross Section ◽  
Parametric Study ◽  
Geometric Characteristics ◽  
Smooth Interface ◽  
Minimum Cross Section ◽  
Precast Structures ◽  
Verification Model ◽  
Column Base

Abstract This work studies the column-base connection by external socket in precast structures. A parametric study of the geometric characteristics of the external socket base with smooth interface is presented. In this parametric study, the consumption of concrete and steel are analyzed. The column cross section, the embedded length of the column in the socket base and the thickness of the wall of the socket base were the variables considered in this study. It was observed that with the increase of the embedded length, the minimum cross section of the main horizontal reinforcement reduces. With this modification, the walls of the socket base that are perpendicular to the direction of the applied loads presented a reduction of their stiffness. Besides the parametric study, this paper presents a verification model. This part of the study shows the possibility to generate abacuses that simplifies the project of the socket base foundation. Moreover, a comparative analysis becomes easier to be accomplished

scholarly journals Neutralino Proton Cross Sections in SUGRA and D-BRANE Models

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 852-854 ◽  
Author(s):  
R. Arnowitt ◽  
B. Dutta ◽  
Y. Santoso
Keyword(s):  
Cross Section ◽  
Parameter Space ◽  
Cross Sections ◽  
Maximum Cross Section ◽  
Minimum Cross Section ◽  
The Future ◽  
Brane Models

We calculate the spin independent neutralino-proton cross section for universal SUGRA, non universal SUGRA and D-brane models with R-parity invariance. The regions of maximum cross section in these models has started to be probed by the current detectors. The minimum cross section generally is [Formula: see text] and hence will be accessible in the future detectors, barring special regions of parameter space where it can reduce to ≃10-12pb. However, the squarks and gluinos will be heavy [Formula: see text] in the latter case, but still accessible at the LHC.

Prediction of earing in cups drawn from anisotropic sheet using slip-line field theory

1974 ◽  
Vol 9 (2) ◽  
pp. 102-108 ◽  
Author(s):  
R Sowerby ◽  
W Johnson
Keyword(s):  
Field Theory ◽  
Slip Line ◽  
Deep Drawing ◽  
Deformation Mode ◽  
Strain Theory ◽  
Material Anisotropy ◽  
Line Field ◽  
Anisotropic Parameter ◽  
Slip Line Field ◽  
Theoretical Predictions

Anisotropic slip-line fields have been developed in the flanges of drawn cups and used to predict the location of the ears and hollows at the onset of the drawing operation. The analysis is based on Hill's plane-strain theory of anisotropic metals. The material anisotropy is characterized by a lumped anisotropic parameter c. Deep-drawing tests were performed on circular blanks cut from anisotropic sheet and the actual deformation mode of particles in the flange was compared with the theoretical predictions. The correlation was found to be favourable.

Anisotropic creep behaviour of (Co, Cr)(Co, Cr)7C3eutectic composite

Metal Science ◽  
1977 ◽  
Vol 11 (12) ◽  
pp. 563-570 ◽  
Author(s):  
D. E. Miles ◽  
M. Mclean
Keyword(s):  
Creep Behaviour ◽  
Anisotropic Creep

Creep behaviour of components containing cracks—a critical review

1978 ◽  
Vol 13 (1) ◽  
pp. 35-51 ◽  
Author(s):  
E G Ellison ◽  
M P Harper
Keyword(s):  
Crack Propagation ◽  
Critical Review ◽  
Elevated Temperatures ◽  
Creep Behaviour ◽  
Crack Tip ◽  
Ductile Materials ◽  
Analysis Techniques ◽  
Reference Stress ◽  
Creep Analysis ◽  
Available Information

The prediction of crack propagation rates at elevated temperatures is important and this paper provides a critical review of available information and models for behaviour. For simplicity, behaviour is divided into three situations. At one extreme, a brittle situation may exist in which the material is brittle and the degree of constraint high, so that substantially plane strain conditions exist and stress redistribution at the crack tip is small; in this situation, the fracture is a local crack tip event and the stress intensity may be of use in correlaiting creep crack propagation data. At the other extreme, ductile behaviour may result if the material is ductile and the constraint is low with plane stress conditions prevailing; in this case, stresses at and near the crack tip will redistribute quickly down to more even values and conventional creep analysis techniques using, say, the reference stress will be most useful, particularly for estimating times to rupture. It is postulated that there is also a large intermediate régime, termed quasi-brittle, in which ductile materials under high constraint exhibit brittle characteristics. A new parameter, C∗, appears to be of more general use in this case and even be extended to other situations. Finally, an attempt is made to survey the information available on the effects of environment on crack propagation at high temperature, though conclusions are necessarily tentative at this time.

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