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IMPROVED MODELING OF METAL FORMING: BAUSCHINGER EFFECTS IN PLASTIC FLOW

Award Information
Agency: National Science Foundation
Branch: N/A
Contract: N/A
Agency Tracking Number: 27554
Amount: $64,704.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Timeline
Solicitation Year: N/A
Award Year: 1994
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
894 Ross Dr Ste 205
Sunnyvale, CA 94089
United States
DUNS: N/A
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Jeffrey R Sachs
 (408) 745-1800
Business Contact
Phone: () -
Research Institution
N/A
Abstract

THIS RESEARCH AND DEVELOPMENT CLOSES THE GAP IN AN IMPORTANT AREA OF SIMULATING MATERIAL BEHAVIOR. IN PARTICULAR, ANISOTROPIC MODELS OF THE BAUSCHINGER EFFECT HAVE BEEN NEGLECTED IN THE DEVELOPMENT OF CODES FOR SIMULATION OF VISCOPLASTIC BEHAVIOR IN SPITE OF ITS IMPORTANCE TO FORMING PHENOMENA. THE BAUSCHINGER EFFECT IS FUNDAMENTAL TO PROPER SIMULATION AND DESIGN OF MANY METAL FORMING OPERATIONS. THE WORK DEMONSTRATES THE FEASIBILITY OF IMPLEMENTING A NEW MODEL OF THE BAUSCHINGER EFFECT. THE NEW VISCOPLASTIC CONSTITUTIVE MODEL IS BASED ON WELL-ESTABLISHED INTERNAL VARIABLE REPRESENTATIONS OF NONLINEAR KINEMATIC HARDENING WHICH PROPERLY ACCOUNT FOR THE RATE AND TEMPERATURE DEPENDENCE, LARGE STRAIN KINEMATICS, AND SUITABLE CO-ROTATIONAL STRESS RATE. THE MODEL IS BEING IMPLEMENTED USING AN EXISTING LAGRANGIAN FINITE ELEMENT PACKAGE AND VERIFIED BY COMPARING SIMULATION PREDICTIONS WITH EXPERIMENTAL RESULTS FOR SEVERAL COMMON EXPERIMENTAL AND MANUFACTURING CONFIGURATIONS.

* Information listed above is at the time of submission. *

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