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Content archived on 2022-11-21

INFLUENCE OF THE DEGREE AND MODE OF FORMING STRAIN ON THE CYCLE STRESS STRAIN AND STRAIN-LIFE BEHAVIOUR OF HIGH STRENGTH SHEET GAUGE FORMABLE STEELS.

Objective



WITH THE INTRODUCTION OF THINNER, STRONGER, HIGH STRENGTH STEELS FOR AUTOBODY WEIGHT REDUCTION, DESIGNERS ARE PAYING INCREASED ATTENTION TO THE FATIGUE AND CYCLIC STRESS-STRAIN PROPERTIES OF SUCH MATERIALS.
FATIGUE LIFE PREDICTION MODELS OF VEHICLE STRUCTURES ARE BECOMING INCREASINGLY SOPHISTICATED. HOWEVER, THE INTERPRETATION OF CUMULATIVE DAMAGE ANALYSIS DATA OBTAINED DURING THE TEST TRACK DRIVING IS NATURALLY LIMITED BY ANY SHORTCOMINGS IN INFORMATION RELATED TO THE BASIC CYCLIC PROPERTIES OF THE STEEL GRADE UNDER CONSIDERATION.
IN THE UNITED STATES IN PARTICULAR, MUCH RESEARCH WORK HAS BEEN CARRIED OUT IN RECENT YEARS ESTABLISHING THE CYCLIC PROPERTIES OF HIGH STRENGTH STEELS UNDER STRAIN CONTROLLED CONDITIONS (A SITUATION MORE RELATED TO COMPONENT IN-SERVICE PERFORMANCE THAN THE TRADITIONAL LOAD OR STRESS CONTROLLED TEST PROCEDURES).
WHILST MUCH WORK HAS BEEN CARRIED OUT ON AS-ROLLED HIGH STRENGTH STEELS IT IS NOT KNOWN TO WHAT EXTENT COLD WORK, INTRODUCED DURING SHEET METAL FORMING, MODIFIES THE CYCLIC STRESS STRAIN AND STRAIN-LIFE PROPERTIES.

IT IS THE AIM OF THIS RESEARCH TO SUBJECT A RANGE OF HIGH STRENGTH STEELS, I.E. REPHOSPHORIZED, HIGH STRENGTH LOW ALLOY, DUAL PHASE AND BAKE HARDENABLE GRADES TO DIFFERENT MODES OF FORMING STRAIN, SUCH AS BIAXIAL TENSION, PLANE STRAIN AND PURE SHEAR (FLANGE DRAWING) AND THEN TO DETERMINE THE RESULTING CYCLIC PROPERTIES AND FATIGUE PERFORMANCE FOR COMPARISON WITH MATERIAL NOT SUBJECTED TO PRIOR STRAIN.

THE RESULTS OF THIS WORK WILL PROVIDE A BETTER UNDERSTANDING OF THE IN-SERVICE FATIGUE PERFORMANCE OF HIGH STRENGTH STEELS AND WILL INDICATE WHETHER THE INFLUENCE OF PRIOR COLD WORK IS A NECESSARY FACTOR TO BE TAKEN INTO ACCOUNT IN THE DESIGN PROCESS.

THE STUDY IS SEEN AS AN EXTENSION TO THE RECENTLY COMPLETED PORSCHE-VDEH ECSC SUPPORTED PROGRAMME AND COMPLEMENTARY TO THE PRESENT STUDY ON THE INFLUENCE OF MICROSTRUCTURE ON CYCLIC PROPERTIES BEING CARRIED OUT AT THE BSC WELSH LABORATORY.

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Coordinator

Swinden Technological Centre
EU contribution
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Address
Moorgate
S60 3AR ROTHERHAM
United Kingdom

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Total cost

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