Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Nondestructive fatigue test method for ferromagnetic construction materials










Image Number 3 for United States Patent #6345534.

A nondestructive test method determines fatigue of a test ferromagnetic construction material by quantifying a change in effective stress due to aging of the test material, in which the magnetic susceptibility (.chi..sub.c) of the test material is measured in its aged state under a magnetic field having a specified intensity (H) according to a relation as expressed by a first equation: c=.chi..sub.c H.sup.3. The magnetic susceptibility (.chi..sub.c) so measured and the magnetic field intensity (H) are put into the first equation, to obtain a susceptibility coefficient (c) of the test material. The susceptibility coefficient (c) so obtained is put into a second equation: .sigma.={log (c)-a}/b, where a and b are known constants determined by an internal structure of the test material, to obtain a current tensile stress (.sigma.) of the test material. The current tensile stress (.sigma.) of the test material so obtained is compared with a known, initial tensile stress (.sigma..sub.0) of the same test material, to determine a change in effective tensile stress of the test material.








 
 
  Recently Added Patents
Pressure-applying member, fixing device, and image forming apparatus
Tailoring the band gap of solar cells made of liquid silane by adding germanium
Nanocatalysts structure, process for the preparation and use thereof
Data architecture and user interface for plasma processing related software applications
Lamp body with integrally molded heat sink
High performance design rule checking technique
Method for the treatment, alleviation of symptoms of, relieving, improving and preventing a cognitive disease, disorder or condition
  Randomly Featured Patents
Automobile front body structure
Fishing float
Device for producing electrolytic water and process for producing electrolytic water
Sealing member for exhaust pipe of dryer
Output buffer circuit and integrated circuit including same
Low power charge pump method and apparatus
Method of making a modular connector
Bottom electrode for memory device and method of forming the same
Method for determining a measuring point in time for a field device and corresponding field device in which a measuring point in time has been determined
Ophthalmic compositions based on tamarind seed polysaccharide and hyaluronic acid