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
Method and system for filtering noises in an image scanned by charged particles
System and method to obtain signal acquisition assistance data
Reception method and reception apparatus
Cooler
Methods of packaging imager devices and optics modules, and resulting assemblies
Materials and methods for stress reduction in semiconductor wafer passivation layers
Methods and compositions for wound healing
  Randomly Featured Patents
Titanium material for solid polymer fuel cell separator having low contact resistance and method of production of same
Seat belt presenter
Optical fiber connector terminal and method of making same
Method of evaluation of skin conditioning-ameliorating agents and method of producing compositions for topical application to skin
Constant-speed running control device for vehicles
Preparation and purification of ionic liquids and precursors
Airbag with flame retardant monolithic coating layer
Gun cleaning case
Method of cultivating agaricus blazei mushroom
Method and apparatus for extracting binary signals included in vertical blanking intervals of video signals