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
System, device and method for transrating file based assets
Mixture, especially spinning solution
Re-establishing push notification channels via user identifiers
Method for manufacturing and reoxidizing a TiN/Ta.sub.2O.sub.5/TiN capacitor
Rose plant named `ESM R044`
Screen
MiR 204, miR 211, their anti-miRs, and therapeutic uses of same
  Randomly Featured Patents
Stairs and railing system for multi-floored buildings and method of constructing same
Disposable liquid reagent cartridge and receptacle therefor
Ejection control device, liquid-ejecting apparatus, ejection control method, recording medium, and program
Positive electrostatic power system
Methods for production of recombinant plasmids
Camouflage tube, a portable camouflage concealment structure
Registration device for positioning silk screen frame against smooth, flat surface
Dynamic fluid control system for immersion lithography
Measurement of finger temperature in near-infrared quantitative measurement instrument
System for assisting fuel-efficient driving