Controlled exfoliation of (100) GaAs-based devices by spalling fracture

2016 ◽  
Vol 108 (1) ◽  
pp. 011906 ◽  
Author(s):  
Cassi A. Sweet ◽  
Kevin L. Schulte ◽  
John D. Simon ◽  
Myles A. Steiner ◽  
Nikhil Jain ◽  
...  
Keyword(s):  
Spalling Fracture

Brittle Behaviour in Aspirin Crystals: Evidence of Spalling Fracture

2020 ◽  
Author(s):  
Benjamin P. A. Gabriele ◽  
Craig J. Williams ◽  
Douglas Stauffer ◽  
Brian Derby ◽  
Aurora J. Cruz-Cabeza
Keyword(s):  
Surface Roughness ◽  
Atomic Force Microscopy ◽  
Single Crystals ◽  
Spalling Fracture ◽  
Force Microscopy ◽  
Atomic Force ◽  
Afm Imaging

<div> <div> <div> <p>Single crystals of aspirin form I were cleaved and indented on their dominant face. Upon inspection, it was possible to observe strongly anisotropic shallow lateral cracks due to the extreme low surface roughness after cleavage. Atomic Force Microscopy (AFM) imaging showed spalling fractures nucleating from the indent corners, forming terraces with a height of one or two interplanar spacings d100. The formation of such spalling fractures in aspirin was rationalised using basic calculations of attachment energies, showing how (100) layers are poorly bonded when compared to their relatively higher intralayer bonding. An attempt at explaining the preferential propagation of these fractures along the [010] direction is discussed. </p> </div> </div> </div>

Brittle Behaviour in Aspirin Crystals: Evidence of Spalling Fracture

2020 ◽  
Author(s):  
Benjamin P. A. Gabriele ◽  
Craig J. Williams ◽  
Douglas Stauffer ◽  
Brian Derby ◽  
Aurora J. Cruz-Cabeza
Keyword(s):  
Surface Roughness ◽  
Atomic Force Microscopy ◽  
Single Crystals ◽  
Spalling Fracture ◽  
Force Microscopy ◽  
Atomic Force ◽  
Afm Imaging

<div> <div> <div> <p>Single crystals of aspirin form I were cleaved and indented on their dominant face. Upon inspection, it was possible to observe strongly anisotropic shallow lateral cracks due to the extreme low surface roughness after cleavage. Atomic Force Microscopy (AFM) imaging showed spalling fractures nucleating from the indent corners, forming terraces with a height of one or two interplanar spacings d100. The formation of such spalling fractures in aspirin was rationalised using basic calculations of attachment energies, showing how (100) layers are poorly bonded when compared to their relatively higher intralayer bonding. An attempt at explaining the preferential propagation of these fractures along the [010] direction is discussed. </p> </div> </div> </div>

scholarly journals Spalling fracture mechanism of granite subjected to dynamic tensile loading

2021 ◽  
Vol 31 (7) ◽  
pp. 2116-2127
Author(s):  
Lin-qi HUANG ◽  
Jun WANG ◽  
Aliakbar MOMENI ◽  
Shao-feng WANG
Keyword(s):  
Fracture Mechanism ◽  
Tensile Loading ◽  
Spalling Fracture ◽  
Dynamic Tensile Loading

Singularities of spalling fracture of plates during synchronized initiation of a high explosive (HE) charge at several points

1984 ◽  
Vol 20 (3) ◽  
pp. 309-311 ◽  
Author(s):  
V. A. Ogorodnikov ◽  
A. G. Ivanov
Keyword(s):  
High Explosive ◽  
Spalling Fracture

Ethylene Glycol Accelerated Weathering Test: An Improved, Objective Aggregate Durability Test Method

2017 ◽  
Vol 2655 (1) ◽  
pp. 27-35
Author(s):  
Petrus G. L. van Blerk ◽  
Enrico Fletcher ◽  
Seosamh B. Costello ◽  
Theuns F. P. Henning
Keyword(s):  
Ethylene Glycol ◽  
Clay Minerals ◽  
Road Construction ◽  
Test Methods ◽  
Test Method ◽  
Accelerated Weathering ◽  
Visual Interpretation ◽  
Durability Test ◽  
Spalling Fracture ◽  
Accelerated Weathering Test

Ethylene glycol has been used extensively by the concrete and road construction industries to identify rock durability issues associated with smectite clay minerals. The presence of these clay minerals is synonymous with rock degradation under normal environmental wetting and drying cycles. However, such historical test methods are predominately based on a subjective visual interpretation, describing the observed degradation of individual rock pieces at fixed time intervals during the soaking process. In addition, some test methods include complex equations with multiple weighting factors applied to nominated degradation descriptors (e.g., spalling, fracture, and disintegration) used to calculate a single durability indicator. This paper describes the development and implementation of an alternative, nonsubjective accelerated weathering test that also uses ethylene glycol. The research included metamorphic and volcanic rock types used extensively in New Zealand for road construction. The greatest benefit of the proposed new test method is the ability to eliminate the subjective visual assessment described in historical test methods and adequately quantify results to specify contractual acceptance and rejection criteria. The test method also shows that good repeatability is possible from duplicate test samples. However, rock quality and quarry production consistency will influence the ability of the test method to report the same “percentage change in fines” over a prolonged test period. This phenomenon was particularly evident with problematic and lower quality rock. The test findings are well supported by observed field performance, thus giving confidence in the new method’s usefulness.

Extension of the principles of the kinetic conception of strength to the process of spalling fracture

1983 ◽  
Vol 19 (1) ◽  
pp. 84-90 ◽  
Author(s):  
A. M. Molodets ◽  
A. N. Dremin
Keyword(s):  
Spalling Fracture

Microstructure and Abrasive Wear Properties of Plasma Sprayed Nanostructured Al2O3-TiO2-ZrO2-CeO2 Coatings

2011 ◽  
Vol 291-294 ◽  
pp. 117-124
Author(s):  
Wei Qin Wu ◽  
Qiang Li ◽  
Zhen Yi Wei ◽  
Hui Ye
Keyword(s):  
Bond Strength ◽  
Plasma Spraying ◽  
Plasma Spray ◽  
Normal Load ◽  
Liquid Phase Sintering ◽  
Orthogonal Experimental Design ◽  
Spray Parameters ◽  
Wear Properties ◽  
Spalling Fracture ◽  
Plasma Sprayed

Al2O3-TiO2-ZrO2-CeO2 coatings formed via a plasma spray approach. The optimal spray parameters of plasma sprayed nano-structured coating were determined by orthogonal experimental design, based on porosity, bond strength of the coatings and the partly melted(PM) zone percentage. Microstructure of the plasma sprayed nanostructured Al2O3-TiO2-ZrO2-CeO2 coating sprayed on the optimal spray parameters was analyzed. Wear map was established by wear experiments. The results show, nanostructured coating contains fully melted (FM) zone and PM zone, the increasing of the critical plasma spray parameter (CPSP) promote the decreasing of the PM zone percentage and the increasing of the bond strength of the coatings. The composition phases of the powder reacted to each other during the plasma spraying process. FM and PM zone resulted from fully melted droplets and partly melted particles respectively. Nanosized crystals and amorphous particles exist in the PM zone, liquid phase sintering is taken place in the PM zone. The main wear mechanism of plasma spraying coatings are plastic deformation and microplow, microfracture and grain spalling, fracture and delamination at different normal load and sliding speed in dry friction.

scholarly journals Brittle Behavior in Aspirin Crystals: Evidence of Spalling Fracture

2021 ◽  
Author(s):  
Benjamin P. A. Gabriele ◽  
Craig J. Williams ◽  
Douglas Stauffer ◽  
Brian Derby ◽  
Aurora J. Cruz-Cabeza
Keyword(s):  
Spalling Fracture ◽  
Brittle Behavior

Spalling fracture of Ni/Al nanolaminates influenced by chemical reaction

2021 ◽  
Vol 130 (7) ◽  
pp. 075103
Author(s):  
Xia Tian ◽  
Meizhen Xiang ◽  
Junzhi Cui ◽  
Guangyu Ji ◽  
Zhuojia Fu
Keyword(s):  
Chemical Reaction ◽  
Spalling Fracture

Resistance of metals to spalling fracture

1982 ◽  
Vol 18 (3) ◽  
pp. 329-335 ◽  
Author(s):  
G. I. Kanel'
Keyword(s):  
Spalling Fracture
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