Deformation behavior of wet and dry clinopyroxenite in the brittle to ductile transition region

1986 ◽  
pp. 35-49 ◽  
Author(s):  
J. N. Boland ◽  
T. E. Tullis
Keyword(s):  
Transition Region ◽  
Deformation Behavior ◽  
Brittle To Ductile Transition

scholarly journals Investigation of Fracture Process of S355JR Steel in Transition Region Using Metallographic and Fractographic Tests and Numerical Analysis

2018 ◽  
Vol 12 (2) ◽  
pp. 145-150 ◽  
Author(s):  
Ihor Dzioba ◽  
Sebastian Lipiec ◽  
Piotr Furmanczyk ◽  
Robert Pala
Keyword(s):  
Transition Region ◽  
Fracture Process ◽  
Test Results ◽  
Transition Range ◽  
Plastic Properties ◽  
Brittle To Ductile Transition ◽  
Edge Notch ◽  
Fractographic Examination ◽  
Electronic Microscope ◽  
Senb Specimen

Abstract In the paper are presented test results of fracture process in brittle-to-ductile transition range for two microstructural types of S355JR steel – ferrite-pearlite and ferrite-carbides. For both kinds of S355JR steel obtained in temperature range of transition region the strength and plastic properties are similar, but the fracture toughness characteristics showed significantly are various. To clarify the differences in the course of trends in the mechanical characteristics performed metallographic and fractographic observations using the scanning electronic microscope. The fractographic examination showed that changes in the fracture surface morphology were dependent on the test temperature. It was also found that during the subcritical crack growth the region of ductile fracture extension reduced with decreasing temperature. The results of finite element method (FEM) calculation the stress fields in front of the crack of single edge notch in bending (SENB) specimens in the range of brittle-to-ductile transition are presented also. The FEM calculations were performed on the numerical model of SENB specimen using the ABAQUS program.

Effects of Ambipolar Diffusion on Prominence Thread Models

1994 ◽  
Vol 144 ◽  
pp. 315-321 ◽  
Author(s):  
M. G. Rovira ◽  
J. M. Fontenla ◽  
J.-C. Vial ◽  
P. Gouttebroze
Keyword(s):  
Energy Balance ◽  
Transition Region ◽  
Ambipolar Diffusion ◽  
Line Profiles ◽  
Balance Equations ◽  
Model Calculations ◽  
Partial Frequency ◽  
Frequency Redistribution ◽  
Partial Frequency Redistribution ◽  
Theoretical Structure

AbstractWe have improved previous model calculations of the prominence-corona transition region including the effect of the ambipolar diffusion in the statistical equilibrium and energy balance equations. We show its influence on the different parameters that characterize the resulting prominence theoretical structure. We take into account the effect of the partial frequency redistribution (PRD) in the line profiles and total intensities calculations.

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