Pingsha Dong

US Patent:

6901809, Jun 7, 2005

Filed:

Nov 16, 2001

Appl. No.:

09/992552

Inventors:

Pingsha Dong - Dublin OH, US
Jinmiao Zhang - Dublin OH, US
Jeong Kyun Hong - Columbus OH, US

Assignee:

Battelle Memorial Institute - Columbus OH

International Classification:

G01D001/02
G01N003/00

US Classification:

73789, 73794

Abstract:

This need is met by the present invention wherein structural stress in a fatigue-prone region of a structure is determined by using the nodal forces and displacement values in the fatigue-prone region, or equilibrium-equivalent simple stress states consistent with elementary structural mechanics in the fatigue-prone region. The determination is substantially independent of mesh size and is particularly well-suited for applications where S-N curves are used in weld fatigue design and evaluation, where S represents nominal stress or stress range and N represents the number of cycles to failure. The present invention is directed to structural stress analysis through various combinations of modeling, calculation, and direct measurement schemes.

US Patent:

7089124, Aug 8, 2006

Filed:

Nov 16, 2004

Appl. No.:

10/989771

Inventors:

Pingsha Dong - Dublin OH, US
Jinmiao Zhang - Dublin OH, US
Jeong Kyun Hong - Columbus OH, US

Assignee:

Battelle Memorial Institute - Columbus OH

International Classification:

G01L 1/00

US Classification:

702 42

Abstract:

Structural stress in a fatigue-prone region of a structure is determined by using the nodal forces and displacement values in the fatigue-prone region, or equilibrium-equivalent simple stress states consistent with elementary structural mechanics in the fatigue-prone region. The determination is substantially independent of mesh size and is particularly well-suited for applications where S-N curves are used in weld fatigue design and evaluation, where S represents nominal stress or stress range and N represents the number of cycles to failure.

US Patent:

7516673, Apr 14, 2009

Filed:

Jun 15, 2006

Appl. No.:

11/424404

Inventors:

Pingsha Dong - Dublin OH, US
Jinmiao Zhang - Dublin OH, US
Jeong Kyun Hong - Columbus OH, US

Assignee:

Battelle Memorial Institute - Columbus OH

International Classification:

G01B 5/30

US Classification:

73760, 73804, 73808

Abstract:

Structural stress in a fatigue-prone region of a structure is determined and analyzed by using: i) the nodal forces and displacement values in the fatigue-prone region, or ii) equilibrium equivalent simple stress states consistent with elementary structural mechanics in the fatigue-prone region. Of course, it is contemplated that combinations, equivalents, or variations of the recited bases may alternatively be employed.

US Patent:

8649985, Feb 11, 2014

Filed:

Oct 30, 2009

Appl. No.:

13/143630

Inventors:

Pingsha Dong - Columbus OH, US
Zhigang Wei - Ann Arbor MI, US
Jeong K. Hong - Dublin OH, US

Assignee:

Battelle Memorial Institute - Columbus OH

International Classification:

G01B 3/44

US Classification:

702 34

Abstract:

A method is provided for performing fatigue evaluation of a fatigue prone location of a tangible structure by converting multi-axial loading data of the fatigue prone location of the tangible structure to a set of equivalent constant amplitude loading data for the tangible structure. According to the method, a multi-axial load locus representing the tangible structure is generated. Time-dependent interior turning points R and any corresponding projected turning point R* art identified along the loading path from the point of origin P to the point of termination Q. Half cycles in the loading path are counted by referring to the interior and projected turning points R, R* along the loading path and to the point of origin P and the point of termination Q on the load locus. A stress range Δσ, loading path length L, and virtual path length for each of the counted half cycles are determined. Additional stress ranges Δσ, loading path lengths L, and virtual path lengths are determined recursively for half cycles counted in additional loading paths on the load locus.

US Patent:

20050029234, Feb 10, 2005

Filed:

Aug 4, 2003

Appl. No.:

10/634020

Inventors:

Feng Lu - Monroeville PA, US
Pingsha Dong - Columbus OH, US
Zhenning Cao - Dublin OH, US

International Classification:

B23K011/30

US Classification:

219119000

Abstract:

A composite resistance spot welding electrode is disclosed which comprises a co-axial annular neck ring, a co-axial insert, a co-axial annular sleeve, or combinations there of. The electrode provides improved nugget formation and longer electrode life.

US Patent:

6768974, Jul 27, 2004

Filed:

Oct 10, 2000

Appl. No.:

09/685909

Inventors:

Ashok Nanjundan - Savoy IL
Pingsha Dong - Dublin OH
Jinmiao Zhang - Dublin OH
Frederick W. Brust - Columbus OH
Yi Dong - Peoria IL

Assignee:

Caterpillar Inc - Peoria IL

International Classification:

G05B 1918

US Classification:

703 7, 703 5, 219137 R, 228101, 228103

Abstract:

A method for determining a model for a welding simulation, and the associated model. The method includes the steps of determining a history annihilation model of a material being welded, determining a strain hardening model of the material being welded, determining a three-dimensional virtual elements detection model of the material being welded, and incorporating the above models into a constitutive model for the welding simulation.

US Patent:

20210362380, Nov 25, 2021

Filed:

May 18, 2021

Appl. No.:

17/323647

Inventors:

- Ann Arbor MI, US
Pingsha DONG - Ann Arbor MI, US

International Classification:

B29C 43/18
B29C 65/64
B29C 65/00
B29C 43/34
B29C 43/46

Abstract:

Methods of producing polymer-metal hybrid components that are bonded by C—O-M bonds at the interface using at least one of the hot pressing, rolling, and injection molding methods to create chemical bond formation conditions at the polymer and metal interface. When the thermal cycle and compressive pressure specified herein is combinationally created at the polymer and metal interfaced, strong C—O-M bonds forms at the interface and strongly bonds the metal and polymer together through the reaction carbonyl groups (C═O) in polymer and the metal surface. For polymers lacking enough carbonyl groups, new functional groups can be in-situ generation through introducing distributed air pockets at the polymer-metal interface for forming 3-dimensional distributed C—O-M bonds at the interface.

US Patent:

20210205919, Jul 8, 2021

Filed:

Dec 18, 2020

Appl. No.:

17/126987

Inventors:

- Ann Arbor MI, US
Pingsha DONG - Ann Arbor MI, US
Wei LU - Ann Arbor MI, US
Alan TAUB - Ann Arbor MI, US

International Classification:

B23K 20/12
B23K 20/227

Abstract:

A method of joining a first component and a second component that are made of dissimilar metals. In some embodiments, the method comprises applying friction between the first component and the second component sufficient to generate a layer of quasi-liquid metal and produce shear localization within the quasi-liquid metal at a dissimilar metal interface between the first component and the second component and terminating the application of friction at a predetermined time after generation of the quasi-liquid metal. In some embodiments, the method comprises applying amorphous metal between at least a portion of the first component and the second component at a dissimilar metal interface, heating the amorphous metal to a temperature between its glass transition temperature (T) and the lowest melting temperature of the components involved, and applying compression pressure to generate thermoplastic deformation of the amorphous metal.