Microcantilever bending experiments in NiAl – Evaluation, size effects, and crack tip plasticity

2014 ◽  
Vol 29 (18) ◽  
pp. 2129-2140 ◽  
Author(s):  
Johannes Ast ◽  
Thomas Przybilla ◽  
Verena Maier ◽  
Karsten Durst ◽  
Mathias Göken
Keyword(s):  
Size Effects ◽  
Crack Tip ◽  
Crack Tip Plasticity ◽  
Image Position

Abstract

Scale-Dependent Crack Modeling for Investigation the Effect of Geometrically Necessary Dislocations in Micro/Nano Grain Size of Copper

2016 ◽  
Vol 15 ◽  
pp. 1-16 ◽  
Author(s):  
Amin Zaami ◽  
Ali Shokuhfar
Keyword(s):  
Grain Size ◽  
Stress Concentration ◽  
Strain Gradient ◽  
Stress Concentration Factor ◽  
Size Effects ◽  
Crack Tip ◽  
Length Scale ◽  
State Variables ◽  
Dependent Model ◽  
Homogeneous Strain

In this study, a scale-dependent model is employed to investigate the size effects of copper on the behavior of the crack-tip. This model includes the homogeneous and non-homogeneous strain hardening based on the wavelet interpretation of size effect. Introducing additional micro/nano structural considerations together with decreasing grain size, different size effects can be obtained. As the size dependency is not taken into account in conventional plasticity, an enhanced theory which is related to the strain gradient introduces a length scale will give more realistic representations of state variables near the crack-tip. Accordingly, the contribution of geometrically necessary dislocations (GNDs) activity on strengthening and stress concentration factor is identified in the crack-tip. Finally, the affected zone which is dominated by presence of GNDs is identified

scholarly journals Crystal structure and size effects on the performance of Li[Ni1/3Co1/3Mn1/3]O2 cathodes

2014 ◽  
Vol 30 (2) ◽  
pp. 286-294 ◽  
Author(s):  
Jianxin Zhu ◽  
Kevin Yoo ◽  
Akhila Denduluri ◽  
Wenting Hou ◽  
Juchen Guo ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Size Effects ◽  
Image Position

Abstract

Monotonic and cyclic crack tip plasticity

1984 ◽  
Vol 6 (1) ◽  
pp. 17-24 ◽  
Author(s):  
L GUERRAROSA ◽  
C MOURABRANCO ◽  
J RADON
Keyword(s):  
Crack Tip ◽  
Crack Tip Plasticity

Comparison of Strip Yield and Net Section Plasticity Models for a Bar in Bending With a Single Edge Crack

2017 ◽  
Author(s):  
Wolf Reinhardt ◽  
Don Metzger
Keyword(s):  
Edge Crack ◽  
Large Scale ◽  
Stress Singularity ◽  
Crack Tip ◽  
Small Scale ◽  
Single Edge ◽  
Yield Model ◽  
Strip Yield Model ◽  
Crack Tip Plasticity ◽  
Stress And Deformation

The strip yield model is widely used to describe crack tip plasticity in front of a crack. In the strip yield model the stress in the plastic zone is considered as known, and stress and deformation fields can be obtained from elastic solutions using the condition that the crack tip stress singularity vanishes. The strip yield model is generally regarded to be valid to describe small scale plasticity at a crack tip. The present paper examines the behavior of the strip yield model at the transition to large-scale plasticity and its relationship to net section plasticity descriptions. A bar in bending with a single edge crack is used as an illustrative example to derive solutions and compare with one-sided and two-sided plasticity solutions.

Crack tip plasticity in dynamic fracture

1987 ◽  
Vol 48 (11) ◽  
pp. 985-1005 ◽  
Author(s):  
P.A. Mataga ◽  
L.B. Freund ◽  
J.W. Hutchinson
Keyword(s):  
Dynamic Fracture ◽  
Crack Tip ◽  
Crack Tip Plasticity
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