Finite Element Analysis of Precursors to Macroscopic Stick–Slip Motion in Elastic Materials: Analysis of Friction Test as a Boundary Value Problem

2014 ◽  
Vol 55 (1) ◽  
pp. 151-163 ◽  
Author(s):  
Shingo Ozaki ◽  
Chihiro Inanobe ◽  
Ken Nakano
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Boundary Value Problem ◽  
Friction Test ◽  
Elastic Materials ◽  
Element Analysis ◽  
Stick Slip ◽  
Materials Analysis ◽  
Stick Slip Motion ◽  
Slip Motion

Finite Element Analysis of Rate- and State-Dependent Frictional Contact Behavior

2011 ◽  
Vol 462-463 ◽  
pp. 547-552 ◽  
Author(s):  
Shingo Ozaki
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Present Method ◽  
Frictional Contact ◽  
Elastic Stiffness ◽  
Rigid Bodies ◽  
Contact Boundary ◽  
Element Analysis ◽  
Stick Slip ◽  
State Dependent

In the present study, the rate- and state-dependent friction model [Hashiguchi and Ozaki, 2008] is implemented in the dynamic finite element method. The typical rate- and state-dependent frictional contact problems, which are consisted by elastic and rigid bodies having simple shapes, are then analyzed by the present method. The validity of the present method for the microscopic sliding and stick-slip instability is examined under various dynamic characteristics of the system, such as contact load, elastic stiffness, driving velocity and frictional properties. It is shown that the present method can solve simultaneously not only rate- and state-dependent frictional behavior on the contact boundary but also coupling effects with internal deformations, whereas it cannot predicted by the conventional finite element analysis with the Coulomb’s friction law.

Stiffness Controlled Piezoelectric Stick-Slip Actuator for Rapid Positioning Applications

Aerospace ◽  
2005 ◽  
Author(s):  
Leon M. Headings ◽  
Gregory N. Washington
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Smart Materials ◽  
Element Analysis ◽  
Stick Slip ◽  
Analysis Techniques ◽  
Piezoelectric Stacks ◽  
Amplification Mechanism ◽  
Fine Resolution

Rotary screw-type stick-slip actuators driven by smart materials offer the attractive characteristics of large stroke, fine resolution, high power-off holding force, and relative simplicity to manufacture. However, the actuation speed of current rotary stick-slip actuators limits their applications. The research presented in this study focuses on rapid positioning applications and involves the development of two mechanism designs. Both designs utilize piezoelectric stacks driven by sawtooth waves to provide stick-slip contact between two partially threaded jaws and a 1/4-80 screw. The first mechanism design utilizes two piezoelectric stacks in a push-pull configuration. The motion of the two stacks is coupled through a lever amplification mechanism. The second design uses a single stack to directly drive the jaws without amplification. However, a second stack is oriented perpendicular to the first stack and driven with a triggered square wave. This stack varies the normal and thus frictional force between the jaws and screw, permitting more efficient slipping and sticking of the actuator. This allows for potential increases in both output speed and force. Existing actuators were modeled using both theoretical and finite element analysis techniques. These results were compared with experimental data to validate the models.

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