Crack Behaviour at Bi-Crystal Interfaces: A Mixed Atomistic and Continuum Approach

2000 ◽  
Vol 653 ◽  
Author(s):  
Arun R. Pillai ◽  
Ronald E. Miller
Keyword(s):  
Brittle Fracture ◽  
Interatomic Interaction ◽  
Atomic Scale ◽  
Fracture Criteria ◽  
Phase Boundaries ◽  
Continuum Approach ◽  
Interfacial Defects ◽  
Engineering Alloys ◽  
Crystal Interfaces ◽  
Crystal Interface

AbstractInterfacial defects like grain boundaries and phase boundaries play an important role in the mechanical behaviour of engineering alloys. In this work the problem of a crack on a bi-crystal interface is studied at the atomic scale, with the goal of elucidating the effects of varrying interatomic interaction on crack behaviour and to assess the suitability of existing fracture criteria to the anisotropic bi-crystal case. Calculations are performed using the Quasicontinuum (QC) method [1]. Using suitable approximations, some of the existing fracture criteria were used to predict ductile or brittle fracture and compared to the QC results.

scholarly journals Verification of Brittle Fracture Criteria for Bimaterial Structures

2014 ◽  
Vol 8 (1) ◽  
pp. 44-48
Author(s):  
Grzegorz Mieczkowski ◽  
Krzysztof Molski
Keyword(s):  
Experimental Data ◽  
Composite Materials ◽  
Cyclic Loading ◽  
Brittle Fracture ◽  
Axial Loading ◽  
Loading Conditions ◽  
Fracture Criteria ◽  
Interfacial Cracks ◽  
Theoretical Results ◽  
Brittle Fracture Criteria

Abstract The increasing application of composite materials in the construction of machines causes strong need for modelling and evaluating their strength. There are many well known hypotheses used for homogeneous materials subjected to monotone and cyclic loading conditions, which have been verified experimentally by various authors. These hypotheses should be verified also for composite materials. This paper provides experimental and theoretical results of such verifications for bimaterial structures with interfacial cracks. Three well known fracture hypotheses of: Griffith, McClintock and Novozhilov were chosen. The theoretical critical load values arising from each hypotheses were compared with the experimental data including uni and multi-axial loading conditions. All tests were carried out with using specially prepared specimens of steel and PMMA.

scholarly journals Atomic-scale description of interfaces in rutile/sodium silicate glass–crystal composites

2018 ◽  
Vol 20 (26) ◽  
pp. 17624-17636 ◽  
Author(s):  
Paul C. M. Fossati ◽  
Michael J. D. Rushton ◽  
William E. Lee
Keyword(s):  
Crystal Structure ◽  
Sodium Silicate ◽  
Silicate Glass ◽  
Glass Phase ◽  
Structural Changes ◽  
Atomic Scale ◽  
Sodium Silicate Glass ◽  
Scale Models ◽  
Glass Crystal ◽  
Crystal Interfaces

Investigations of glass/crystal interfaces using atomic-scale models underlined structural changes in the glass phase as it accommodates the underlying crystal structure.

scholarly journals Atomic Scale Modulation of Self-Rectifying Resistive Switching by Interfacial Defects

2018 ◽  
Vol 5 (6) ◽  
pp. 1800096 ◽  
Author(s):  
Xing Wu ◽  
Kaihao Yu ◽  
Dongkyu Cha ◽  
Michel Bosman ◽  
Nagarajan Raghavan ◽  
...  
Keyword(s):  
Resistive Switching ◽  
Atomic Scale ◽  
Interfacial Defects

Atomic Scale Fluctuations Govern Brittle Fracture and Cavitation Behavior in Metallic Glasses

2011 ◽  
Vol 107 (21) ◽  
Author(s):  
P. Murali ◽  
T. F. Guo ◽  
Y. W. Zhang ◽  
R. Narasimhan ◽  
Y. Li ◽  
...  
Keyword(s):  
Brittle Fracture ◽  
Metallic Glasses ◽  
Atomic Scale ◽  
Cavitation Behavior

Brittle Fracture Criteria Transferability Evaluation by Testing on Different Specimen Geometries

2008 ◽  
Author(s):  
S. Chapuliot ◽  
S. Marie
Keyword(s):  
Brittle Fracture ◽  
Critical Stress ◽  
Master Curve ◽  
Numerical Study ◽  
Fracture Criteria ◽  
Vessel Steel ◽  
Stress Criterion ◽  
Probability Of Fracture ◽  
Two Stages ◽  
Brittle Fracture Criteria

This paper describes an experimental and numerical study to assess the transposability of brittle fracture criteria from specimens of one type of geometry to another. The overall “master curve” approach, the Beremin model and a proposed model using the concept of critical stress were accordingly analysed. The experimental work supporting the analysis was made on 16MND5 reactor vessel steel. This was in the form of CT25 specimens, taken as the reference type, SENT specimens, ring specimens and CTpor specimens, which are CT specimens with a semi-elliptical surface defect. The analysis itself was made in two stages: the models were first calibrated on the basis of CT25 test results, then they were applied to specimens of other geometries. We then demonstrate that, in all cases, the models correctly replicated the variation of toughness (as measured on a CT25 specimen) with temperature. However, they all failed when applied to SENT and ring specimens, where calculation underestimates the probability of fracture. For CTpor specimens, the results are better, the master curve approach and the critical stress criterion give satisfactory results (but it has not yet been possible to apply the Beremin method). This paper concludes with a detailed analysis of the crack tip stress and strain fields, followed by an attempt to explain the differences between the different types of behaviour observed.

scholarly journals Atomic scale structure and chemistry of anti-phase boundaries in (Bi0.85Nd0.15)(Fe0.9Ti0.1)O3ceramics

2012 ◽  
Vol 371 ◽  
pp. 012036 ◽  
Author(s):  
L Q Wang ◽  
B Schaffer ◽  
I MacLaren ◽  
S Miao ◽  
A J Craven ◽  
...  
Keyword(s):  
Scale Structure ◽  
Atomic Scale ◽  
Phase Boundaries ◽  
Atomic Scale Structure

Atomic-scale features of phase boundaries in hot deformed Nd–Fe–Co–B–Ga magnets infiltrated with a Nd–Cu eutectic liquid

2014 ◽  
Vol 77 ◽  
pp. 111-124 ◽  
Author(s):  
T.G. Woodcock ◽  
Q.M. Ramasse ◽  
G. Hrkac ◽  
T. Shoji ◽  
M. Yano ◽  
...  
Keyword(s):  
Atomic Scale ◽  
Eutectic Liquid ◽  
Phase Boundaries
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