Dynamic shearing resistance of molten metal films under high pressures and extremely high shearing rates

2002 ◽  
Vol 42 (2) ◽  
pp. 161-171 ◽  
Author(s):  
Makoto Okada ◽  
Nai-Shang Liou ◽  
Vikas Prakash
Keyword(s):  
Molten Metal ◽  
High Pressures ◽  
Metal Films ◽  
Shearing Resistance ◽  
High Shearing ◽  
Dynamic Shearing

Dynamic shearing resistance of cohesive soils

1966 ◽  
Author(s):  
Thomas Lars Hanson
Keyword(s):  
Cohesive Soils ◽  
Shearing Resistance ◽  
Dynamic Shearing

Dynamic shearing resistance of hydroxyl-terminated polybutadiene (HTPB)

2021 ◽  
Vol 129 (24) ◽  
pp. 245901
Author(s):  
Pinkesh Malhotra ◽  
Tong Jiao ◽  
David L. Henann ◽  
Rodney J. Clifton ◽  
Pradeep R. Guduru
Keyword(s):  
Shearing Resistance ◽  
Dynamic Shearing

Dynamic shearing resistance of a polymer-bonded energetic simulant: Composite of sucrose and hydroxyl-terminated polybutadiene (HTPB)

2021 ◽  
Vol 130 (18) ◽  
pp. 185902
Author(s):  
Pinkesh Malhotra ◽  
Tong Jiao ◽  
Rodney J. Clifton ◽  
Pradeep R. Guduru
Keyword(s):  
Shearing Resistance ◽  
Dynamic Shearing

Dynamic Shearing Resistance of an Energetic Material Simulant: Sucrose

2021 ◽  
pp. 104624
Author(s):  
Pinkesh Malhotra ◽  
Tong Jiao ◽  
David L. Henann ◽  
Rodney J. Clifton ◽  
Pradeep R. Guduru
Keyword(s):  
Energetic Material ◽  
Shearing Resistance ◽  
Dynamic Shearing

Dynamic Shearing Resistance of Soils

1967 ◽  
Vol 10 (4) ◽  
pp. 0439-0443 ◽  
Author(s):  
T. L. Hanson ◽  
H. P. Johnson ◽  
and D. F. Young
Keyword(s):  
Shearing Resistance ◽  
Dynamic Shearing

Dynamic Slip Resistance at Metal-on-Metal Interfaces

2006 ◽  
Author(s):  
Fuping Yuan ◽  
Vikas Prakash
Keyword(s):  
Aluminum Alloy ◽  
Molten Metal ◽  
Molten Aluminum ◽  
Metal Films ◽  
Melt Temperature ◽  
Interfacial Conditions ◽  
Slip Resistance ◽  
Metal On Metal ◽  
Shearing Deformation ◽  
Dynamic Slip

In the present study plate-impact pressure-shear friction experiments were employed to investigate dynamic slip resistance and time-resolved growth of molten metal films during dry metal-on-metal slip under extreme interfacial conditions. By employing tribo-pairs comprising hard tool-steel against relatively low melt-point metals such as 7075-T6 aluminum alloy, interfacial friction stress of up to 300 MPa and slip speeds of approximately 250 m/s have been achieved. These relatively extreme interfacial conditions are conducive to the development of molten metal films at the tribo-pair interface. A Lagrangian finite element code is developed to understand the evolution of the thermo-mechanical fields and their relationship to the observed slip response. The code accounts for dynamic effects, heat conduction, contact with friction, and full thermo-mechanical coupling. At temperatures below the melting point the material is described as an isotropic thermally softening elastic-viscoplastic solid. For material elements with temperatures in excess of the melt temperature a purely Newtonian fluid constitutive model is employed. The results of the hybrid experimental-computational study provide new insights into the thermoelastic-plastic interactions during high speed metal-on-metal slip. During the early part of friction slip the coefficient of kinetic friction is observed to decrease with increasing slip velocity. During the later part transition in interfacial slip occurs from dry metal-on-metal sliding to the formation of molten A1 films at the tribo-pair interface. Under these conditions the interfacial resistance approaches the shear strength of the molten aluminum alloy under normal pressures of approximately 1-4.5 GPa and shear strain rates of ~ 107 s-1. It is interesting to note that the dynamic shear resistance of molten metal films decreases from ~100 MPa to ~50 MPa when the initial slip velocities increase from ~100m/s to ~250 m/s. Scanning electron microscopy of the slip surfaces reveal molten aluminum to be smeared on the tribo-pair interface. Photo-micrographs of the cross-section of the 7075-T6 A1 alloy reveals a thin region of severe shearing deformation in close vicinity of the sliding surface. The shearing deformation manifests itself as severely deformed grains in the direction of the sliding.

Experimental and Computational Study of the Shearing Resistance of Polyurea at High Pressures and High Strain Rates

2014 ◽  
Vol 24 (2) ◽  
pp. 778-798 ◽  
Author(s):  
Mica Grujicic ◽  
R. Yavari ◽  
J. S. Snipes ◽  
S. Ramaswami ◽  
T. Jiao ◽  
...  
Keyword(s):  
High Pressures ◽  
High Strain ◽  
Computational Study ◽  
Strain Rates ◽  
High Strain Rates ◽  
Shearing Resistance

Formation of molten metal films during metal-on-metal slip under extreme interfacial conditions

2004 ◽  
Vol 52 (9) ◽  
pp. 2025-2056 ◽  
Author(s):  
Nai-Shang Liou ◽  
Makoto Okada ◽  
Vikas Prakash
Keyword(s):  
Molten Metal ◽  
Metal Films ◽  
Interfacial Conditions ◽  
Metal On Metal

Dynamic Shearing Resistance of Dry Ottawa Sand

1970 ◽  
Vol 96 (2) ◽  
pp. 705-720
Author(s):  
Kenan Atakol ◽  
H. Gordon Larew
Keyword(s):  
Ottawa Sand ◽  
Shearing Resistance ◽  
Dynamic Shearing
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