Patents by Inventor Pingsha Dong
Pingsha Dong 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).
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Patent number: 11958137Abstract: Due to geometric discontinuities introduced by welding and joining processes, stresses or strain cannot be calculated reliably calculated using modern analytical and computer methods as result of stress or strain singularity at joint locations, which leads to severe mesh sensitivity. Design and fatigue evaluation of these structures remain empirical. This disclosure addresses mesh insensitivity of stress/strain calculations for welded structures through a cut-plane traction stress method through a novel post processing of conventional finite element computation results, as well as provides a unified fatigue evaluation procedure for fatigue design and structural life evaluation for both low-cycle and high cycle fatigue regime subjected to either proportional or non-proportional multiaxial fatigue loading, as well as a simple and reliable method for treating spot welds.Type: GrantFiled: May 26, 2022Date of Patent: April 16, 2024Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Pingsha Dong, Xianjun Pei, Jifa Mei
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Patent number: 11890788Abstract: 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.Type: GrantFiled: May 18, 2021Date of Patent: February 6, 2024Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Fengchao Liu, Pingsha Dong
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Methods To Directly Join Metals To Polymer/Polymer Composites Using Functionally Active Insert Layer
Publication number: 20240025150Abstract: A method of joining a metal part and a polymer/polymer composite part comprising providing a metal part; providing a polymer or polymer composite part; inserting an insert layer between the metal part and the polymer or polymer composite part; and applying heat to the metal part to a temperature above the melting temperatures and below a degradation temperature of the polymer or polymer composite part and the insert layer and simultaneously applying pressure to the combination of the metal part, the polymer or polymer composite part, and the insert layer to combine the metal part and the polymer or polymer composite part into a joined assembly having a chemical bond therebetween.Type: ApplicationFiled: July 19, 2023Publication date: January 25, 2024Inventors: Abdul Sayeed KHAN, Pingsha DONG, Fengchao LIU -
Methods To Directly Join Metals To Polymer/Polymer Composites Using Functionally Active Insert Layer
Publication number: 20240025167Abstract: A method of joining a metal part and a polymer/polymer composite part comprising providing a metal part; providing a polymer or polymer composite part; inserting an insert layer between the metal part and the polymer or polymer composite part; and applying heat to the metal part to a temperature above the melting temperatures and below a degradation temperature of the polymer or polymer composite part and the insert layer and simultaneously applying pressure to the combination of the metal part, the polymer or polymer composite part, and the insert layer to combine the metal part and the polymer or polymer composite part into a joined assembly having a chemical bond therebetween.Type: ApplicationFiled: July 18, 2023Publication date: January 25, 2024Inventors: Abdul Sayeed KHAN, Pingsha DONG, Fengchao LIU -
Publication number: 20230281353Abstract: A method for modeling joints using User Element (UEL) techniques by analytically eliminating a series of internal degrees of freedom for representing actual weld or joint stiffness in structures. The resulting formulation is in closed-forms enabling computational accuracy and simplicity for structural applications. For spot joint, the detailed ring type of finite elements required to achieve a reasonable accuracy can be replaced by a simple finite element mesh using just four user elements. The UEL joint modeling method offers accurate stress calculation results by comparing with the mesh-insensitive structural stress method coupled with a detailed explicit joint representation of joints. The UEL method can also be applied for modeling seam welded joints, e.g., MIG, laser, and friction stir welds. The explicit representation of weld fillet geometry required by existing methods is no longer needed by the UEL plate/shell elements without losing any accuracy.Type: ApplicationFiled: February 28, 2023Publication date: September 7, 2023Inventors: Lunyu ZHANG, Shengjia WU, Pingsha DONG
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Publication number: 20230173768Abstract: A method of directly joining a polymer to a metal along a joint interface through the formation of C—O—M chemical bonds, where M represents an element in the metal to be joined. The method includes heating the metal to a predetermined temperature above a glass transition temperature of the polymer and less than a flash ignition temperature of the polymer and less than a metal melting temperature of the metal; and applying force to the joint interface of the metal and the polymer to generate intimate atomic contact between the metal and the polymer to create C—O—M chemical bonds between the metal and the polymer.Type: ApplicationFiled: July 21, 2022Publication date: June 8, 2023Inventors: Fengchao LIU, Pingsha DONG
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Publication number: 20230121810Abstract: A solid-state manufacturing method comprising urging a metal-based feedstock material within a sleeve of a propulsion system in a processing direction along an axis of the sleeve and against a friction die adjacent one end of the sleeve; softening at least a portion of the feedstock material within the hollow portion of the sleeve to a malleable state to form malleable feedstock material using relative rotatory friction between the friction die and the feedstock material; extruding the malleable feedstock material from an extrusion hole in response to the urging step; and depositing the malleable feedstock material from the extrusion hole onto a substrate as a paste using at least one plastering surface and continuing depositing the malleable feedstock material as deposit layers until a desired shape is completed.Type: ApplicationFiled: November 10, 2022Publication date: April 20, 2023Inventors: Fengchao LIU, Pingsha DONG
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Patent number: 11471982Abstract: Due to geometric discontinuities introduced by welding and joining processes, stresses or strain cannot be calculated reliably calculated using modern analytical and computer methods as result of stress or strain singularity at joint locations, which leads to severe mesh sensitivity. Design and fatigue evaluation of these structures remain empirical. This disclosure addresses mesh insensitivity of stress/strain calculations for welded structures through a cut-plane traction stress method through a novel post processing of conventional finite element computation results, as well as provides a unified fatigue evaluation procedure for fatigue design and structural life evaluation for both low-cycle and high cycle fatigue regime subjected to either proportional or non-proportional multiaxial fatigue loading, as well as a simple and reliable method for treating spot welds.Type: GrantFiled: August 6, 2018Date of Patent: October 18, 2022Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Pingsha Dong, Xianjun Pei, Jifa Mei
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Publication number: 20220281034Abstract: Due to geometric discontinuities introduced by welding and joining processes, stresses or strain cannot be calculated reliably calculated using modern analytical and computer methods as result of stress or strain singularity at joint locations, which leads to severe mesh sensitivity. Design and fatigue evaluation of these structures remain empirical. This disclosure addresses mesh insensitivity of stress/strain calculations for welded structures through a cut-plane traction stress method through a novel post processing of conventional finite element computation results, as well as provides a unified fatigue evaluation procedure for fatigue design and structural life evaluation for both low-cycle and high cycle fatigue regime subjected to either proportional or non-proportional multiaxial fatigue loading, as well as a simple and reliable method for treating spot welds.Type: ApplicationFiled: May 26, 2022Publication date: September 8, 2022Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Pingsha DONG, Xianjun PEI, Jifa MEI
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Patent number: 11396139Abstract: A method of directly joining a polymer to a metal along a joint interface through the formation of C—O-M chemical bonds, where M represents an element in the metal to be joined. The method includes heating the metal to a predetermined temperature above a glass transition temperature of the polymer and less than a flash ignition temperature of the polymer and less than a metal melting temperature of the metal; physically contacting at least one of the metal and the polymer; and applying compression pressure to the joint interface of the metal and the polymer when the metal is above the glass transition temperature of the polymer and less than the flash ignition temperature of the polymer and less than the metal melting temperature of the metal to generate intimate atomic contact between the metal and the polymer to create C—O-M chemical bonds between the metal and the polymer.Type: GrantFiled: April 23, 2020Date of Patent: July 26, 2022Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Fengchao Liu, Pingsha Dong
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Publication number: 20210362380Abstract: 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.Type: ApplicationFiled: May 18, 2021Publication date: November 25, 2021Inventors: Fengchao LIU, Pingsha DONG
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Publication number: 20210205919Abstract: 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 (Tg) and the lowest melting temperature of the components involved, and applying compression pressure to generate thermoplastic deformation of the amorphous metal.Type: ApplicationFiled: December 18, 2020Publication date: July 8, 2021Inventors: Fengchao LIU, Pingsha DONG, Wei LU, Alan TAUB
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Publication number: 20210053283Abstract: A solid-state manufacturing system having a sleeve having a hollow portion for receiving a feedstock material; a friction die rotatably coupled adjacent an end of the sleeve, the friction die and the sleeve being rotatable relative to each other along a rotation axis and configured to generate frictional heat to heat at least a portion of the feedstock material within the hollow portion of the sleeve to a malleable state; a propulsion system operably coupled to the sleeve configured to urge the feedstock material in a processing direction along the rotational axis; and an extrusion hole configured to permit the malleable feedstock material to be extruded from the extrusion hole in response to the propulsion system. A solid-state manufacturing method similarly configured is provided.Type: ApplicationFiled: July 17, 2020Publication date: February 25, 2021Inventors: Fengchao LIU, Pingsha DONG
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Publication number: 20200368976Abstract: A method of directly joining a polymer to a metal along a joint interface through the formation of C—O-M chemical bonds, where M represents an element in the metal to be joined. The method includes heating the metal to a predetermined temperature above a glass transition temperature of the polymer and less than a flash ignition temperature of the polymer and less than a metal melting temperature of the metal; physically contacting at least one of the metal and the polymer; and applying compression pressure to the joint interface of the metal and the polymer when the metal is above the glass transition temperature of the polymer and less than the flash ignition temperature of the polymer and less than the metal melting temperature of the metal to generate intimate atomic contact between the metal and the polymer to create C—O-M chemical bonds between the metal and the polymer.Type: ApplicationFiled: April 23, 2020Publication date: November 26, 2020Inventors: Fengchao Liu, Pingsha Dong
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Publication number: 20190054573Abstract: Due to geometric discontinuities introduced by welding and joining processes, stresses or strain cannot be calculated reliably calculated using modern analytical and computer methods as result of stress or strain singularity at joint locations, which leads to severe mesh sensitivity. Design and fatigue evaluation of these structures remain empirical. This disclosure addresses mesh insensitivity of stress/strain calculations for welded structures through a cut-plane traction stress method through a novel post processing of conventional finite element computation results, as well as provides a unified fatigue evaluation procedure for fatigue design and structural life evaluation for both low-cycle and high cycle fatigue regime subjected to either proportional or non-proportional multiaxial fatigue loading, as well as a simple and reliable method for treating spot welds.Type: ApplicationFiled: August 6, 2018Publication date: February 21, 2019Inventors: Pingsha DONG, Xianjun PEI, Jifa MEI
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Publication number: 20160207140Abstract: A method that improves the weldability, weld quality and mechanical performance of components involving concentric parts or non-concentric parts with closed weld seams of dissimilar metals and uses a temperature differential concept on one of the parts or both of the parts to be joined is proposed. This method results in improved weldability, prevents weld cracking both during and after welding, and significantly improves structural performance in terms of static, fatigue, and dynamic strengths. For dissimilar metal joints that are prone to formation of intermetallics, the differential temperature technique can significantly reduce the detrimental effects of intermetallics on mechanical performance of joints, as a result of favorable stress state generated by the temperature differential.Type: ApplicationFiled: January 19, 2016Publication date: July 21, 2016Inventors: Pingsha DONG, Shaopin SONG, Xianjun PEI
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Patent number: 8649985Abstract: 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 ??e, loading path length L, and virtual path length for each of the counted half cycles are determined.Type: GrantFiled: October 30, 2009Date of Patent: February 11, 2014Assignee: Battelle Memorial InstituteInventors: Pingsha Dong, Zhigang Wei, Jeong K. Hong
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Publication number: 20120130650Abstract: 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 ??e, loading path length L, and virtual path length for each of the counted half cycles are determined.Type: ApplicationFiled: October 30, 2009Publication date: May 24, 2012Applicant: BATTELLE MEMORIAL INSTITUTEInventors: Pingsha Dong, Zhigang Wei, Jeong K. Hong
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Publication number: 20110288790Abstract: 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 ??e, loading path length L, and virtual path length for each of the counted half cycles are determined.Type: ApplicationFiled: October 30, 2009Publication date: November 24, 2011Applicant: BATTELLE MEMORIAL INSTITUTEInventors: Pingsha Dong, Zhigang Wei, Jeong K. Hong
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Patent number: 7516673Abstract: 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.Type: GrantFiled: June 15, 2006Date of Patent: April 14, 2009Assignee: Battelle Memorial InstituteInventors: Pingsha Dong, Jinmiao Zhang, Jeong Kyun Hong