IMPROVED MODELING OF METAL FORMING: BAUSCHINGER EFFECTS IN PLASTIC FLOW

Award Information
Agency:
National Science Foundation
Branch
n/a
Amount:
$64,704.00
Award Year:
1994
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
27554
Agency Tracking Number:
27554
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
894 Ross Dr Ste 205, Sunnyvale, CA, 94089
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Jeffrey R Sachs
(408) 745-1800
Business Contact:
() -
Research Institute:
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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