Abstract:
A tensile tester includes a tester body having at least one detector and a controller, and the controller includes a first branch setting unit that sets a first branching condition at a first branch point at which a test condition branches into two or more test conditions in association with a detection result of the detector, a first condition setting unit that sets a first test condition that is a test condition before the first branch point, and a second condition setting unit that sets a second test condition that is a test condition after the first branch point.
Abstract:
An indentation head system for an indentation instrument includes: an indenter tip contacting a sample surface along at least an indentation axis; a reference element supporting the tip; a zero-level sensor generating a signal indicating whether the tip is displaced with respect to the reference element from a neutral relative position; an elastic element between the tip and an actuator with known elongation, the actuator connected to the reference element; and a controller receiving signals from the zero-level sensor to perform servo control of the actuator based on output of the zero-level sensor and the known elongation of the actuator so the zero-level sensor outputs a signal corresponding to a substantially zero displacement of the tip from the neutral relative position, the controller calculating a force applied by the tip to the sample based on an output of the displacement sensor and an elastic coefficient of the elastic element.
Abstract:
A method and a test fixture for evaluating a junction between an electrical lead trace and a busbar are described, and include an electric power supply disposed to supply electric power to the electrical lead trace and an electric monitoring device disposed to monitor electrical potential across the junction. A mechanical stress-inducing device is disposed to apply mechanical stress proximal to the junction. The electric monitoring device monitors the electrical potential across the junction of the electrical lead trace coincident with the mechanical stress-inducing device applying mechanical stress proximal to the junction when the electric power supply is supplying electric power to the electrical lead trace. Electrical integrity of the junction is evaluated based upon the monitored electrical potential across the junction.
Abstract:
Devices and methods employing interdigitated dielectrostrictive sensors are disclosed for measuring shear stress, and obtaining strain-dielectric and stress-dielectric coefficients to monitor a process, and examine quality of dielectric materials, including but not limited to polymer, composite, grease, food, biofluids and etc. The dielectrostrictive sensor includes at least two interdigitated sensors, each having at least two electrodes and a central axis. The central axes are disposed in a common plane and are oriented at different directions.
Abstract:
Methods and systems are disclosed for determining an amount of bond between a structure and sensor. A method may include performing a process associated with a sensor bonded to a structure and generating measured data in response to the process. The method may further include comparing the measured data to known reference data to determine integrity of a bond between the sensor and the structure. A system may include a sensor system including at least one sensor bonded to a structure. The system may further include a sensing system configured to initiate an application of one or more stimuli to the at least one sensor and monitor a property associated with the at least one sensor. The sensing system may further be configured to determine an amount of bond between the at least one sensor and the structure based on the monitored property. Structures having one or more sensors bonded thereto and an associated sensing system for determining bond integrity between the one or more sensors and the structure are also disclosed.
Abstract:
The present invention is directed to a sensor-enabled geosynthetic material for use in geosynthetic structures and geosyntapes, a method of making the sensor-enabled geosynthetic material and the geosyntapes, and a method of measuring geometric strains of a geosynthetic product made from the sensor-enabled geosynthetic material. The sensor-enabled geosynthetic material includes a polymeric material and an electrically conductive filler. The polymeric material and an electrically conductive filler are combined to provide a sensor-enabled geosynthetic material. The sensor-enabled geosynthetic material having a predetermined concentration of the electrically conductive filler so as to provide the sensor-enabled geosynthetic material with an electrical conductivity and a strain sensitivity within the percolation region or slightly above it.
Abstract:
An apparatus for testing an edge of a workpiece for sharpness includes a body, a probe extending outwardly and pivotably mounted from the body, the probe is biased in a direction for placement against an edge of a workpiece with a predetermined force, a test head on a distal end of the probe for mounting test tape for physical contact with an edge as a test medium, a test point for mounting to the workpiece, and a continuity circuit mounted to the body in electrical communication with the test head and the test point for providing a predetermined electrical current between the test head and the test point through the workpiece when the test tape is cut sufficiently by the workpiece to allow the test head to touch the workpiece to form a complete circuit.
Abstract:
Methods and systems are disclosed for determining an amount of bond between a structure and sensor. A method may include heating a sensor that is operably coupled to a measuring circuit and then measuring an output signal over time. The method may further include determining, from the output signal, a percentage of bond integrity remaining between the sensor and the structure. A system may include a measurement circuit having a sensor operably coupled to a sensing system. The sensing system may be configured for applying a thermal shock to the sensor and subsequently measuring an output signal of the measuring circuit. The sensing system may also be configured for determining, from the output signal, an amount of bond between the sensor and the structure.
Abstract:
The present invention is directed to a sensor-enabled geosynthetic material for use in geosynthetic structures, a method of making the sensor-enabled geosynthetic material, and a method of measuring geometric strains of a geosynthetic product made from the sensor-enabled geosynthetic material. The sensor-enabled geosynthetic material includes a polymeric material and an electrically conductive filler. The polymeric material and an electrically conductive filler are combined to provide a sensor-enabled geosynthetic material. The sensor-enabled geosynthetic material having a predetermined concentration of the electrically conductive filler so as to provide the sensor-enabled geosynthetic material with an electrical conductivity and a strain sensitivity within the percolation region or slightly above it.
Abstract:
The invention relates to a method for examining the resistance of a connection between two bodies, whereby one of the bodies only has a small mass. A correspondingly directed force is exerted upon the connection until disconnection thereof. The force used is the centrifugal force which acts at a distance from a rotational axis in a concentric manner about said rotated connection. Said method is particularly advantageous if the body having a small mass is a coating which is applied to the other body. In order to obtain a sufficiently high centrifugal force, an examining stamp is applied to the body having the small mass and/or the coating on the side oriented away from the connection. The adhesion between the body and/or the coating and the examining stamp is greater than between both of the bodies and/or the coating and the other body.