Application of Micromechanical Models to the Prediction of Ductile Fracture

2009 ◽  
pp. 368-368-11 ◽  
Author(s):  
D-Z Sun ◽  
R Kienzler ◽  
B Voss ◽  
W Schmitt
Keyword(s):  
Ductile Fracture ◽  
Micromechanical Models

scholarly journals An overview of application of micromechanical models in ductile fracture analysis of welded joints

2020 ◽  
Vol 47 (1) ◽  
pp. 33-62
Author(s):  
M. Rakin ◽  
B. Medjo ◽  
N. Gubeljak ◽  
A. Sedmak
Keyword(s):  
Ductile Fracture ◽  
Welded Joints ◽  
Void Nucleation ◽  
Base Material ◽  
Damage Parameter ◽  
Damage Development ◽  
Long Time ◽  
Actual Material ◽  
Micromechanical Models

Fracture of welded joints has been an important research and industrial topic for a long time, having in mind the key role of welded joints in ensuring the safe operation and integrity of welded structures. This work contains an overview of application of micromechanical models to ductile fracture of welded joints. The main benefit of these models, in comparison with the classical fracture mechanics approach, is consideration of the local quantities (stress and strain) in prediction of damage development. The damage is quantified through the value of the damage parameter, which is typically related to the void nucleation, growth and coalescence for ductile fracture of metallic materials, i.e. the description of the material can be related to the actual material behaviour during fracture. Most of the presented studies, including those published by the present authors, are performed on steel as the base material, and the rest deal with aluminium alloys.

Improved preservation of the otolithic membranes

1987 ◽  
Vol 45 ◽  
pp. 914-915
Author(s):  
G. M. Cohen ◽  
J. S. Grasso ◽  
M. L. Domeier ◽  
P. T. Mangonon
Keyword(s):  
Toluidine Blue ◽  
Potassium Phosphate ◽  
Vestibular Function ◽  
Spatial Relations ◽  
White Leghorn ◽  
Supporting Cells ◽  
Semithin Sections ◽  
Micromechanical Models ◽  
Soluble Components

Any explanation of vestibular micromechanics must include the roles of the otolithic and cupular membranes. However, micromechanical models of vestibular function have been hampered by unresolved questions about the microarchitectures of these membranes and their connections to stereocilia and supporting cells. Otolithic membranes are notoriously difficult to preserve because of severe shrinkage and loss of soluble components. We have empirically developed fixation procedures that reduce shrinkage artifacts and more accurately depict the spatial relations between the otolithic membranes and the ciliary bundles and supporting cells.We used White Leghorn chicks, ranging in age from newly hatched to one week. The inner ears were fixed for 3-24 h in 1.5-1.75% glutaraldehyde in 150 mM KCl, buffered with potassium phosphate, pH 7.3; when postfixed, it was for 30 min in 1% OsO4 alone or mixed with 1% K4Fe(CN)6. The otolithic organs (saccule, utricle, lagenar macula) were embedded in Araldite 502. Semithin sections (1 μ) were stained with toluidine blue.

Ductile Fracture of a Marine Structural Steel based on HC-DSSE Combined Fracture Strain Formulation

2019 ◽  
Vol 56 (1) ◽  
pp. 82-93
Author(s):  
Sung-Ju Park ◽  
Kangsu Lee ◽  
Burak Can Cerik ◽  
Younghyn Kim ◽  
Joonmo Choung
Keyword(s):  
Ductile Fracture ◽  
Structural Steel ◽  
Fracture Strain ◽  
Strain Formulation
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