scholarly journals Scaffold-free cartilage subjected to frictional shear stress demonstrates damage by cracking and surface peeling

2014 ◽  
Vol 11 (2) ◽  
pp. 412-424 ◽  
Author(s):  
G. Adam Whitney ◽  
Karthik Jayaraman ◽  
James E. Dennis ◽  
Joseph M. Mansour
Keyword(s):  
Shear Stress ◽  
Frictional Shear Stress

Ultrasonic Measurement of Gas Bubbles Advecting Under a Ship Bottom for Investigating Drag Reduction Performance

2015 ◽  
Author(s):  
Hyun Jin Park ◽  
Yuji Tasaka ◽  
Yoshihiko Oishi ◽  
Yuichi Murai
Keyword(s):  
Shear Stress ◽  
Liquid Film ◽  
Drag Reduction ◽  
Thin Liquid Film ◽  
Acrylic Resin ◽  
Ultrasonic Measurement ◽  
Towing Tank ◽  
Stress Sensors ◽  
Frictional Shear Stress ◽  
Shear Stress Sensors

Bubbles injected into a turbulent boundary layer have a significant potential to reduce frictional shear stress, but this drag reduction technique has not been optimized yet because of its low and unstable performance. If monitoring and controlling of advective bubbles beneath ships are realized, these provide insight for improving the performance. In this paper, we performed experiments using a model ship with 4 m in length in a towing tank with 80 m in distance. The model ship is fully made of acrylic resin and mounts shear stress sensors and ultrasonic measurement system. The shear stress and bubble information, such as a void fraction and a thickness of liquid film above the bubbles, are obtained at three locations arranged at the front, the middle and the rear of the ship bottom plane. By analyzing these data, it is confirmed that the drag reduction occurs when a thin liquid film exists.

scholarly journals The kinetic frictional shear stress of ZnO nanowires on graphite and mica substrates

2019 ◽  
Vol 465 ◽  
pp. 584-590 ◽  
Author(s):  
Lizhen Hou ◽  
James Lee Mead ◽  
Shiliang Wang ◽  
Han Huang
Keyword(s):  
Shear Stress ◽  
Zno Nanowires ◽  
Frictional Shear Stress

The Welding Mechanism in Drawing of Aluminum Sheet

1980 ◽  
Vol 102 (3) ◽  
pp. 229-238 ◽  
Author(s):  
N. Kawai ◽  
T. Nakamura ◽  
S. Seko
Keyword(s):  
Shear Stress ◽  
Mild Steel ◽  
Steel Sheet ◽  
Testing Machine ◽  
Frictional Coefficient ◽  
Aluminum Sheet ◽  
Drawing Process ◽  
Mineral Oils ◽  
Friction Testing ◽  
Frictional Shear Stress

As a continuation of the previous report which dealt with a mild steel sheet, this study covers the welding phenomena at a tool-work interface in deformation processing of aluminum sheet which has been investigated experimentally by using a two dimensional drawing-type friction testing machine. Variation mode of the frictional coefficient during the drawing process can be classified into four types, namely,- constant, increasing, decreasing and waving type. In both the increasing and decreasing types, the welding occurs at a die exit portion, similar to the case of mild steel reported previously. In the waving type, a process of growth and the peeling away of the welding layer is repeated at a central portion of the die, and corresponding frictional coefficient waves develop. The frictional shear stress on the welding region is constant (about 68.6 MPa), approximately equaling the yield shear stress of the aluminum. The ability to repair the welding has been examined by measurement of the frictional coefficient at the designated drawing travel for mineral oils with various viscosities and compositions.

Effect of plastic deformation of bulk material on frictional shear stress

2013 ◽  
Author(s):  
Tatsuhiro Suzuki ◽  
Zhigang Wang ◽  
Yasuharu Yoshikawa
Keyword(s):  
Plastic Deformation ◽  
Shear Stress ◽  
Bulk Material ◽  
Frictional Shear Stress
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