Abstract: A test fixture for determining circumferential shear properties of an arcuate test specimen may include an outer fixture and an inner fixture. The outer fixture may be coupled to an outer side of the test specimen, and may be rotatably mounted on a central pin and may include a rocker arm. The inner fixture may be coupled to an inner side of the test specimen, and may be rotatably mounted on the central pin and may include a load arm extending in a direction opposite the rocker arm. The inner fixture and the outer fixture may be configured such that application of a test load to the rocker arm and the load arm causes rotation thereof about the central pin producing circumferential movement of the inner side relative to the outer side and inducing a circumferential shear load in the test specimen.

Abstract: A torsion tester including a reaction force unit and a drive unit including a servo motor, a first reduction gear, a shaft transmitting an output force from the first reduction gear, a clutch having an input shaft fixed to the shaft, a second reduction gear decelerating rotation of an output shaft of the clutch, a chuck, and a connection mechanism connecting the chuck with one of the shaft and the second reduction gear, the drive unit configured to switch between a first mode where the clutch is disengaged, and the shaft is connected with the chuck by the connection mechanism and a second mode where the clutch is engaged, and the second reduction gear is connected with the chuck by the connection mechanism.

Abstract: A torsion tester including a reaction force unit and a drive unit including a servo motor, a first reduction gear, a shaft transmitting an output force from the first reduction gear, a clutch having an input shaft fixed to the shaft, a second reduction gear decelerating rotation of an output shaft of the clutch, a chuck, and a connection mechanism connecting the chuck with one of the shaft and the second reduction gear, the drive unit configured to switch between a first mode where the clutch is disengaged, and the shaft is connected with the chuck by the connection mechanism and a second mode where the clutch is engaged, and the second reduction gear is connected with the chuck by the connection mechanism.

Abstract: A binding force testing device for testing the binding force of a hinge, includes a control chassis for controlling the binding force testing device; a platform mounted on the control chassis; a support mounted on the control chassis above the platform; a first driving device mounted on the support; a main holder mounted on the first driving device facing the platform; and a second driving device mounted on the support and connected to the first driving device. The first driving device drives the main holder to move relative to the platform in a first direction; the second driving device drives the first driving device to move relative to the platform in a second direction perpendicular to the first direction.

Abstract: A torque testing device is for testing the torque of a hinge. The torque testing device includes a main board, two sidewalls respectively located at two sides of the main board, and a loading board rotatably mounted between the sidewalls. The loading board is for retaining the hinge. Additionally, a sensor is mounted on the loading board. a measuring element is mounted on the sensor, and a testing ring is mounted on the main board. The hinge is rotated to drive the loading board to rotate relative to the sidewalls so the measuring element move toward and presses the testing ring, thereby the testing ring applies torque to the measuring element and the sensor senses the torque applied to the measuring element, which is equal to the torque of the hinge being tested.

Abstract: According to one aspect of the disclosure, the present invention provides methods and arrangements for testing the integrity of laminate and solder adhesion strength in circuit devices. Methods include securely mounting one end of a circuit device, and affixing a rotatable shaft attached to a controllable servo motor to the other end of the circuit device. The circuit device is monitored so as to be able to detect failure, and torque is applied to the circuit device from the servo motor. When failure of the circuit device is detected, the torque is reduced.

Abstract: A torsion tester for circuit board assemblies (boards) clamps opposite edges of the board and cyclicly twists the board to provide substantially pure sheer stress in interconnection joints to SMT components for replicating failure modes due to thermal cycling. The boards are automatically centered in the clamps, the distance between the clamps is automatically measured, and the machine rotates one of the clamps to produce out-of-plane deflection which repeat within 0.01 degree per inch of the distance to provide repeatable results. During testing the maximum deflection and torque of each cycle and the location and cycle count at each failure is automatically recorded until a large population of failures is obtained. The population of failures is automatically compared to a statistical database of previous populations to identify any unusual deviations and for determining the reliability of the production process.

Abstract: A torsional tester includes test stations for one or more circuit cards. In each test station, one end of the circuit card under test is held stationary while the opposite end is twisted in a card holder mounted to pivot about an axis, being alternately driven by each of a pair of weights extending downward on a flexible member from opposite sides of a pulley. A rocker providing a platform extending under each of these weights is driven in a reciprocating pivoting motion in which the weights are alternately lifted and allowed to fall. The weight which is allowed to fall provides a torque to the pulley, while the weight being lifted does not provide such a torque. A pair of setscrews limits the angular motion of the card holder to a predetermined level in each direction.

Abstract: A method of measuring a characteristic of a material in a structure is the subject of the present invention. A known stress relationship S=TC/J is utilized in practicing the method of the present invention. In the foregoing formula S=strength in p.s.i.; T=torque force in pounds/inch; C=distance to the point of interest in inches; and J=.pi./2r.sup.4 where J is the polar moment of inertia for a circle of radius r (in inches). A drive head is adhesively secured to a segment of the structure to be tested. A known torque force is then applied to the drive head and this known force is translated into a measurement of the material characteristic utilizing the formula indicated. The method may be utilized to test the ultimate shear strength by failing the material or may be utilized to measure strength up to a design criteria without carrying the material to failure. Other material characteristics may also be measured utilizing the known formula set forth above and other known relationships.

Abstract: A device and procedure for measuring the strength of brittle material such as concrete in which a measurable torque is applied to a body member embedded in the material. The body member has a reacting surface which contacts a portion of the material to be tested and exerts a compressive force thereon in response to the application of torque to the body member. A thin layer of compressible material is provided on the body member adjacent the reacting surface to ensure unimpeded localized rupture of the material during the test. Torque is applied to the body member through an elongated rod which has one end secured to the body member and the opposite end extending outwardly from a surface of the material. In a preferred embodiment, the elongated rod is first turned in one direction to break the bond between the material and the device and turned in the opposite direction to apply the compressive force to a portion of the material.

Abstract: A torsion shear apparatus, especially for testing adhesives, in which two members of a test specimen bonded one into the other are subjected to a torsional load, comprising a rigid retainer for non-rotatable and form-locked retention of the first member of the test specimen, an operating member rotatably mounted in a radial bearing system in horizontal alignment with the retainer and adapted for form-locked and non-rotatable engagement with the second member of the test specimen, and a torsion-applying device for rotating the operating member relative to the retainer, characterized in that the operating member comprises a web connecting two radial bearings, each supported in a bearing support, the web being engaged by a horizontal load lever forming the torsion-applying device, and in that the retainer comprises a sliding guide portion having guide surfaces extending transversely of the radial bearings and permitting radial displacement of the first test specimen member.