Patents by Inventor Madhavarao Krishnadev

Madhavarao Krishnadev has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Metal fiber with optimized geometry for reinforcing cement-based materials
    Patent number: 5443918
    Abstract: A metal fiber for reinforcing cement-based materials comprises an elongated, substantially straight central portion and sinusoid shaped end portions. The sinusoid at each end portion has an optimum amplitude A.sub.o,opt defined by:A.sub.o,opt =[k.sub.1 (.sigma..sub.c).sup.k.sub.2 ][.sigma..sub.u.sup..alpha. .epsilon..sub.f.sup..beta. ][A.sub.f /P.sub.f ]wherek.sub.1 = 2.025.times.10.sup.-2,.sigma..sub.c =compressive strength of the cement-based material in MPa,k.sub.2 =3.19.times.10.sup.-1,.sigma..sub.u =ultimate tensile strength of the metal in MPa,.alpha.= 6.60.times.10.sup.-1,.epsilon..sub.f =ductility of the metal in percent, and.beta.= 3.20.times.10.sup.-1,A.sub.f =cross-sectional area of the fiber in mm.sup.2, andP.sub.f =perimeter of the fiber in mm.The sinusoid further has a wavelength L.sub.s defined by:L.sub.s =(L.sub.f -L.sub.m)/2whereL.sub.f =length of the fiber,L.sub.m =length of the central portion,and wherein 0.5 L.sub.f <L.sub.m <0.75 L.sub.f.
    Type: Grant
    Filed: September 7, 1994
    Date of Patent: August 22, 1995
    Assignee: Universite Laval
    Inventors: Nemkumar Banthia, Madhavarao Krishnadev