Patents by Inventor Takahiro Aitoh

Takahiro Aitoh 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).

  • Publication number: 20200025659
    Abstract: This fracture determination device 1 is provided with: an element extraction unit 22 which extracts elements included in the heat affected zone formed around a spot weld in a steel material; a reference forming limit value generation unit 23 which generates a reference forming limit value depending on sheet thickness and material property of the heat affected zone on the basis of reference forming limit value information; a heat affected zone forming limit value generation unit 24 which uses the tensile strength of the steel material and element size to change the reference forming limit value, predict the forming limit value for the element size and generated a forming limit value in the heat affected zone; an analysis running unit 25 which runs a deformation SIM using input information and which outputs deformation information including maximum principal strain and minimum principal strain of each of the elements; a principal strain determination unit 26 which determines the maximum principal strain and the
    Type: Application
    Filed: October 5, 2017
    Publication date: January 23, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takahiro AITOH, Koichi HAMADA, Yoshiyuki KASEDA
  • Patent number: 10518596
    Abstract: A joint provided with a base part 12, a pair of side parts 14, 14 extending from the two end parts of the base part 12 in the first direction D1 to the same side in the second direction D2 vertical to the first direction D1, the pair of side parts 14, 14 being formed with fastening holes 14H at the center in a third direction D3 vertical to both the first direction D1 and second direction D2, and a closed part 16 formed between the pair of side parts 14, 14 as an extended region of the base part 12 and pair of side parts 14, 14 at least at one end in the third direction D3.
    Type: Grant
    Filed: October 7, 2015
    Date of Patent: December 31, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Takahiro Aitoh, Takeshi Kawachi
  • Publication number: 20190212236
    Abstract: A fracture determination device is provided which can predict fracture in an ultra-hard steel material.
    Type: Application
    Filed: October 5, 2017
    Publication date: July 11, 2019
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takahiro AITOH, Jun NITTA, Yoshiyuki KASEDA
  • Publication number: 20190064040
    Abstract: In a deformation simulation of a member joined by spot welding, an effective width being a width in a direction intersecting a direction of a load centered on a spot welded portion (14) on a flange face (13a) where the spot welded portion (14) is provided of a member (10) and changing correspondingly to a change in the load is calculated every predetermined time interval, and fracture of the spot welded portion (14) is predicted using the calculated effective width. This configuration enables precise fracture prediction of a spot welded portion where spot welding is modeled, for example, in a case of performing collision deformation prediction of an automobile member on a computer.
    Type: Application
    Filed: February 3, 2017
    Publication date: February 28, 2019
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takahiro AITOH, Toshiyuki NIWA, Yoshiyuki KASEDA, Nobuyuki MANIWA
  • Publication number: 20180032654
    Abstract: A break prediction method according to the present invention predicts a break of a joint portion of an object to be analyzed including a pair of members joined to each other by using a finite element method, and includes a first step of acquiring at least an element size of a base material portion, from among parameters set in an element model for the object to be analyzed; a second step of calculating, as a break discernment standard, a break limit moment defined by a function including the element size of the base material portion as a variable; and a third step of discerning whether the moment applied to the joint portion in a deformation analysis of the element model for the object to be analyzed exceeds the break limit moment, and outputting the result of the discernment as a break prediction result for the joint portion.
    Type: Application
    Filed: February 17, 2016
    Publication date: February 1, 2018
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takahiro AITOH, Yoshiyuki KASEDA, Yusuke TSUNEMI
  • Publication number: 20170305228
    Abstract: A joint realizing higher rigidity without increasing the wall thickness provided with a base part 12, a pair of side parts 14, 14 extending from the two end parts of the base part 12 in the first direction D1 to the same side in the second direction D2 vertical to the first direction D1, the pair of side parts 14, 14 being formed with fastening holes 14H at the center in a third direction D3 vertical to both the first direction D1 and second direction D2, and a closed part 16 formed between the pair of side parts 14, 14 as an extended region of the base part 12 and pair of side parts 14, 14 at least at one end in the third direction D3.
    Type: Application
    Filed: October 7, 2015
    Publication date: October 26, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takahiro AITOH, Takeshi KAWACHI
  • Publication number: 20090250147
    Abstract: This DR steel sheet includes the following steel components: C: 0.02 to 0.06 mass %, Si: equal to or less than 0.03 mass %, Mn: 0.05 to 0.5 mass %, P: equal to or less than 0.02 mass %, S: equal to or less than 0.02 mass %, Al: 0.02 to 0.10 mass %, and N: 0.008 to 0.015 mass %. The amount of solute N (Ntotal?NasAlN) in the steel sheet containing a residual iron and inevitable impurities, is equal to or more than 0.006%; and the total stretchability in a rolling direction after aging is equal to or more than 10%, total stretchability in a sheet width direction after aging is equal to or more than 5%, and an average Lankford value after aging is equal to or less than 1.0.
    Type: Application
    Filed: August 9, 2007
    Publication date: October 8, 2009
    Inventors: Hiroshi Nishida, Shigeru Hirano, Takahiro Aitoh, Seiichi Tanaka