On the role of frictional sliding in the compressive fracture of ice and granite: Terminal vs. post-terminal failure

2006 ◽  
Vol 54 (15) ◽  
pp. 3923-3932 ◽  
Author(s):  
E SCHULSON ◽  
A FORTT ◽  
D ILIESCU ◽  
C RENSHAW
Keyword(s):  
Frictional Sliding ◽  
Compressive Fracture

scholarly journals Detachment of compliant films adhered to stiff substrates via van der Waals interactions: role of frictional sliding during peeling

2014 ◽  
Vol 11 (97) ◽  
pp. 20140453 ◽  
Author(s):  
Rachel R. Collino ◽  
Noah R. Philips ◽  
Michael N. Rossol ◽  
Robert M. McMeeking ◽  
Matthew R. Begley
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Interactions ◽  
Work Of Adhesion ◽  
Interface Fracture ◽  
Strong Function ◽  
Frictional Sliding ◽  
Fracture Models ◽  
Synthetic Adhesives ◽  
Interface Sliding

The remarkable ability of some plants and animals to cling strongly to substrates despite relatively weak interfacial bonds has important implications for the development of synthetic adhesives. Here, we examine the origins of large detachment forces using a thin elastomer tape adhered to a glass slide via van der Waals interactions, which serves as a model system for geckos, mussels and ivy. The forces required for peeling of the tape are shown to be a strong function of the angle of peeling, which is a consequence of frictional sliding at the edge of attachment that serves to dissipate energy that would otherwise drive detachment. Experiments and theory demonstrate that proper accounting for frictional sliding leads to an inferred work of adhesion of only approximately 0.5 J m −2 (defined for purely normal separations) for all load orientations. This starkly contrasts with the interface energies inferred using conventional interface fracture models that assume pure sticking behaviour, which are considerably larger and shown to depend not only on the mode-mixity, but also on the magnitude of the mode-I stress intensity factor. The implications for developing frameworks to predict detachment forces in the presence of interface sliding are briefly discussed.

scholarly journals Role of matrix behavior in compressive fracture of bovine cortical bone

2017 ◽  
Vol 96 (5) ◽  
Author(s):  
Ashwij Mayya ◽  
Anuradha Banerjee ◽  
R. Rajesh
Keyword(s):  
Cortical Bone ◽  
Compressive Fracture

Dependence of Peak Stress on Crack Inclination and Friction Coefficient During Compressive Fracture

2017 ◽  
Author(s):  
Ameya Deshpande ◽  
Gaurav Singh
Keyword(s):  
Experimental Study ◽  
Friction Coefficient ◽  
Uniaxial Compression ◽  
Peak Stress ◽  
Friction Coefficients ◽  
Compressive Fracture ◽  
Crack Faces

In the present work, an experimental study to analyze the role of friction between the crack faces and crack inclination in compressive fracture of wood has been conducted. Different orientations of (parallel to grain) central slit cracks in wood samples were put under quasi-static uniaxial compression to measure the peak stress carried by the sample. In order to extend the analysis to different friction coefficients at the crack faces without altering other properties, the wood was kept unchanged while the crack faces were coated with paint and polish. The peak stress was largeley observed to increase with an increase in the crack inclination (wrt horizontal) and decrease in the friction coefficient between the crack faces.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management

The power of norms to sway fused group members

2018 ◽  
Vol 41 ◽  
Author(s):  
Winnifred R. Louis ◽  
Craig McGarty ◽  
Emma F. Thomas ◽  
Catherine E. Amiot ◽  
Fathali M. Moghaddam
Keyword(s):  
Evolutionary Anthropology ◽  
Normative Systems ◽  
Violent Extremism ◽  
Identity Fusion ◽  
Group Members

AbstractWhitehouse adapts insights from evolutionary anthropology to interpret extreme self-sacrifice through the concept of identity fusion. The model neglects the role of normative systems in shaping behaviors, especially in relation to violent extremism. In peaceful groups, increasing fusion will actually decrease extremism. Groups collectively appraise threats and opportunities, actively debate action options, and rarely choose violence toward self or others.

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