Class 374/47 - Cyclic

Subclass of Class 374 - Thermal measuring and testing
Definition: Subject matter wherein the loading is repeatedly varied
No. of patents: 28
Last issue date: 04/29/2008

Number	Title	Issue Date
7363765	Article of footwear with temperature regulation means Article of footwear includes a sole, an insole overlying the sole, the insole having in a surface thereof a groove having an inlet and outlet in an edge of the insole, the groove winding substantially throughout the length and width of the insole upper surface. A tu...	04/29/2008
7296927	Laboratory apparatus and method for evaluating cement performance for a wellbore A test cell for testing a sample cement composition includes a test chamber and a variable stress system. The test chamber is configured to hold a sample cement composition for a wellbore. The variable stress system communicates with the test chamber. Performance of...	11/20/2007
7090393	Using thermal imaging to prevent loss of steam turbine efficiency by detecting and correcting inadequate insulation at turbine startup The invention involves the use of thermal imaging equipment to take infrared images of a steam turbine during start-up. The exterior temperatures developed from the infrared images are correlated with turbine vibration data to determine which insulation temperature ...	08/15/2006
6918695	Apparatus for measuring the breathability and comfort of a shoe An apparatus for measuring the breathability and comfort level of a shoe, comprising a rigid structure that duplicates the contour of a foot, divided into at least three thermally insulated regions from each other, for the shoe to be tested, resistors heating the re...	07/19/2005
6523999	Process for evaluating life of article subjected to thermal cycles based on comparison of strain rates measured under evaluating conditions and actual service conditions A method to accurately evaluate a thermal cycle life of an article with a restraint rate as an evaluating parameter without providing a thermal cycle under actual service conditions to the article subjected to the thermal cycle. A thermal cycle of a tempe...	02/25/2003
6260998	Method for specifying accelerated thermal cycling tests for electronic solder joint durability A method for testing an electronic module to evaluate solder joint failures caused by thermally induced stress includes determining a thermal shock endurance test profile that represents field temperature conditions, estimating time/cycles to failure of s...	07/17/2001
6164818	Method and apparatus for measuring viscous heating of viscoelastic materials Method and apparatus for measuring viscous heating/heat build-up of viscoelastic materials, such as rubber and polymer compounds. Temperature changes in the viscoelastic material are measured during application of a shearing force to the viscoelastic mate...	12/26/2000
5765431	Method for finish surface testing An apparatus and method for testing the mechanical durability of a test surface finish of an object, such as a cooking vessel. The apparatus consists principally of a sliding support fixture operated by a gearmotor with an eccentric drive providing altern...	06/16/1998
5375453	Assembly for evaluating gasket service life and method for performing the same A method and apparatus for approximating the life of a gasket used in a predetermined environment is provided which allows for the long-term exposure to the environment to be simulated over a shortened period of time. The method and apparatus utilize the ...	12/27/1994
5349870	Method and apparatus for detecting stress in an object Apparatus for measuring stress at a point on an object comprising: means for applying a cyclically varying load of period T to the object; detector means for collecting and measuring thermal radiation from said point over a sample time interval t, wherein...	09/27/1994
5154085	Tension type dynamic viscoelasticity measuring apparatus A tension type dynamic viscoelasticity measuring apparatus composed of a strain detector for detecting changes in length of a specimen, an electromagnetic force generator for applying a force to the specimen, a moving mechanism for moving the electromagne...	10/13/1992
5079956	Testing of viscoelastic materials In a method of testing a sample of viscoelastic material held under pressure between two opposing, temperature-controlled dies, the sample is subjected to an oscillatory, rotary shearing force which has a predetermined amplitude and a frequency within the...	01/14/1992
4828400	Stress analyzer with automatic overload response An object stress analyzing system includes a scanning head with a detector, a variable gain amplifier and a control unit which controls the scanning head and which acquires stress-related data from the amplifiers. The control unit responds to detector ove...	05/09/1989
4559812	Rheometer and method of use thereof A rheometer of the type which includes a chamber (26) in which, in use, a sample of rubber or of a synthetic elastomer which is to be tested is held under pressure in contact with a rotor (27), and means for measuring torque applied to the rotor (27) as i...	12/24/1985
4552025	Multifunction processability testing method and apparatus A method and apparatus for testing samples of viscoelastic materials are shown, in which the sample is contained under pressure between two dies and the forces involved in rotating one die with respect to the other. The method uses different frequencies o...	11/12/1985
4541059	Stress distribution measuring instrument An external force is periodically applied to an object to be measured, a two-dimensional surface of the object is resolved and scanned by suitable infrared radiation detection means, and the infrared radiation at the times of maximum and minimum loading b...	09/10/1985
4445790	Apparatus for cryogenic proof testing of rotating parts An apparatus to test a rotating metal part at a cryogenic temperature is disclosed. This apparatus includes an inner chamber wherein a metal part can be mounted for rotation and brought to a cryogenic temperature and then placed in a vacuum. The container...	05/01/1984
4378701	Apparatus and method for indicating stress in an object Apparatus and method for indicating stress in an object comprising viewing the temperature variation of part of the surface of the object as it is stressed. An infra-red detector detects small changes of temperature and the stress may be applied by natura...	04/05/1983
4145912	Method and apparatus for measuring visco-elasticity of composite sheet material The present invention relates to a method and apparatus for measuring the viscoelasticity of a sheet material comprising a flexible organic and/or inorganic reinforcement impregnated with a synthetic resin, wherein a sample of said sheet is subjected to a...	03/27/1979
4103541	Method of and a device for measuring a relaxation phenomenon A method of measurement of relaxation phenomena, in which input signals representing a relaxation phenomenon are recorded at equal intervals for logarithmic values of time. A measuring device for relaxation phenomena which comprises a logarithmic time pul...	08/01/1978
4095461	Rheological test method and apparatus Rheological property measurement employing eccentric rotating disc apparatus wherein measurements of viscous and elastic force data are made at multiple displacements of the disc axes to cancel errors....	06/20/1978
4059983	Process for the determination of the visco-elastic characteristics of polymers and arrangement to carry out the process A process for the determination of the visco-elastic characteristics of polymers which includes stimulating a rolling pendulum which is supported on a flat horizontal surface of a polymer sample, to free, attenuated rolling oscillations at different tempe...	11/29/1977
4056973	Testing viscoelastic solids An apparatus and method for testing viscoelastic solids, such as tire cord. The apparatus includes: holding means, pretension means, first and second displacement generators, and mechanical-electrical transforming means. The holding means holds the materi...	11/08/1977
4046002	Method and apparatus for determining rotor life expended The useful life of a turbomachine part is affected by cyclic stresses which occur in the turbomachine part as a result of heating and cooling the turbomachine part. Each thermal cycle is comprised of a maximum heating stress and a maximum cooling stress w...	09/06/1977
4041806	Testing cord-to-elastomer adhesion The adhesion of cord or wire to the elastomer, rubber, or rubbery material is measured by exerting forces or loads collinear with the cords or wires such that one of the cords or wires is pulled from between a pair of cords. The three cords are embedded i...	08/16/1977
4034602	Dynamic mechanical analyzer An instrument for determining the complex mechanical response of samples incorporates two parallel sample arms each pivotally mounted at their central portion by flexure pivots of precisely known spring constants. The sample is mounted on one end of each....	07/12/1977
3945241	Fretting corrosion test fixture A fretting corrosion test fixture for evaluating materials or coatings in variable temperature environments and having a load bar and a flexure bar rigidly mounted at their respective one ends in the jaws of a vise and separated by a shim of selected thic...	03/23/1976
3934452	Method of determining dynamic strains in composite structures A method for determining strain amplitudes in each component, during cyclic straining of a 2-component structure in which at least one component shows non-linear viscoelastic behavior. The heat generation rates of each component are determined experimenta...	01/27/1976

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Class 374/47 - Cyclic