A corrosion-mechanical crack as a multielectrode system

1994 ◽  
Vol 29 (4) ◽  
pp. 406-409
Author(s):  
L. N. Petrov ◽  
A. Yu. Kalinkov
Keyword(s):  
Mechanical Crack ◽  
Multielectrode System

scholarly journals Design of a Sensitive Balloon Sensor for Safe Human–Robot Interaction

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2163
Author(s):  
Dongjin Kim ◽  
Seungyong Han ◽  
Taewi Kim ◽  
Changhwan Kim ◽  
Doohoe Lee ◽  
...  
Keyword(s):  
High Performance ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Human Robot Interaction ◽  
Large Area ◽  
Tactile Sensors ◽  
Robot Interaction ◽  
Mechanical Crack ◽  
Flexible Strain Sensor ◽  
Contact Sensing

As the safety of a human body is the main priority while interacting with robots, the field of tactile sensors has expanded for acquiring tactile information and ensuring safe human–robot interaction (HRI). Existing lightweight and thin tactile sensors exhibit high performance in detecting their surroundings. However, unexpected collisions caused by malfunctions or sudden external collisions can still cause injuries to rigid robots with thin tactile sensors. In this study, we present a sensitive balloon sensor for contact sensing and alleviating physical collisions over a large area of rigid robots. The balloon sensor is a pressure sensor composed of an inflatable body of low-density polyethylene (LDPE), and a highly sensitive and flexible strain sensor laminated onto it. The mechanical crack-based strain sensor with high sensitivity enables the detection of extremely small changes in the strain of the balloon. Adjusting the geometric parameters of the balloon allows for a large and easily customizable sensing area. The weight of the balloon sensor was approximately 2 g. The sensor is employed with a servo motor and detects a finger or a sheet of rolled paper gently touching it, without being damaged.

Mechanical Fatigue of Rubber

1972 ◽  
Vol 45 (1) ◽  
pp. 309-328 ◽  
Author(s):  
G. J. Lake
Keyword(s):  
Fracture Mechanics ◽  
Crack Growth ◽  
Complex Shape ◽  
Atmospheric Oxygen ◽  
Fatigue Behavior ◽  
Repeated Loading ◽  
Mechanical Fatigue ◽  
Available Energy ◽  
Mechanical Deformations ◽  
Mechanical Crack

Abstract Fatigue failure of rubber under repeated loading is reviewed. The process considered is that occurring in the absence of appreciable temperature rise as a result of the development of one or more cracks. A fracture mechanics approach, based on the elastic energy available for crack propagation, enables the crack growth and fatigue behavior to be interrelated quantitatively and is helpful from both basic and applied viewpoints. Initiation of mechanical crack growth is governed by a critical value of the available energy, which is of similar magnitude for various elastomers and can be related approximately to the primary bond strength and molecular structure. Once this value is exceeded, the characteristics of growth vary markedly for different elastomers and appear to be influenced primarily by the elastic hysteresis of the rubber at high strains. Although the mechanical deformations are the basic driving force, the crack growth and fatigue behavior can also be strongly affected by atmospheric oxygen and ozone and the mechanisms of action of these gases are described. Implications of the work from the testing and service viewpoints are considered. A major problem in applying the fracture mechanics approach is to determine the energy available for crack growth in a component of complex shape. Recently-developed methods of doing this are discussed and the quantitative application of the approach to predict service performance is illustrated.

Thermal Mechanical Crack Growth Rate of a High Strength Nickel Base Alloy

1986 ◽  
Vol 108 (2) ◽  
pp. 396-402 ◽  
Author(s):  
D. A. Wilson ◽  
J. R. Warren
Keyword(s):  
Crack Propagation ◽  
Crack Growth ◽  
Base Alloy ◽  
High Strength ◽  
Operating Conditions ◽  
Thermally Induced ◽  
Propagation Modeling ◽  
Computer Based ◽  
Mechanical Crack ◽  
Nickel Base

An understanding of thermal mechanical fatigue (TMF) crack propagation is fundamental to the application of fracture mechanics to gas turbine components. Typical operating conditions for a cooled turbine disk rim consist of a complex mechanical history and an associated variable amplitude thermal history. While thermally induced stress gradients are commonly incorporated in the mechanical history, the effects of thermal cycling on crack growth must be addressed in an appropriate fatigue model. A current computer-based empirical crack propagation modeling system has demonstrated effectiveness under isothermal conditions and can be readily expanded to include thermal-mechanical effects. The existing isothermal models were developed from an extensive data base and describe crack growth over a broad range of temperature and loading conditions. Building on this established system, a model of thermal-mechanical crack growth is being developed.

Magnetic field, temperature and mechanical crack performance of a GdBCO magnetic lens

2012 ◽  
Vol 25 (11) ◽  
pp. 115012 ◽  
Author(s):  
Z Y Zhang ◽  
S Matsumoto ◽  
R Teranishi ◽  
T Kiyoshi
Keyword(s):  
Magnetic Field ◽  
Magnetic Lens ◽  
Field Temperature ◽  
Mechanical Crack

3-D Potential Distribution Measurement in Electrosurgery by a Flexible Multielectrode System

2014 ◽  
Vol 63 (10) ◽  
pp. 2447-2453 ◽  
Author(s):  
Christoph Knopf ◽  
Jorg Himmel ◽  
Stephan Klockner ◽  
Klaus Thelen ◽  
Olfa Kanoun
Keyword(s):  
Potential Distribution ◽  
Distribution Measurement ◽  
Multielectrode System

Thermo-mechanical crack propagation in aircraft engine vane by coupled FEM–DBEM approach

2014 ◽  
Vol 67 ◽  
pp. 57-69 ◽  
Author(s):  
R. Citarella ◽  
G. Cricrì ◽  
M. Lepore ◽  
M. Perrella
Keyword(s):  
Crack Propagation ◽  
Aircraft Engine ◽  
Mechanical Crack
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