An influence of cyclic loading on the form of constitutive relationship for DP500 steel
PBN-AR
Instytucja
Instytut Podstawowych Problemów Techniki Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
MATERIALS AND DESIGN
ISSN
0261-3069
EISSN
Wydawca
DOI
Rok publikacji
2016
Numer zeszytu
Strony od-do
183-193
Numer tomu
103
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
EN
Constitutive model
Dual-phase steel
Fatigue
Stress–strain curve
Fatigue damage
Inelastic strain
Streszczenia
Język
EN
Treść
Fatigue loading induces a microstructure evolution leading to the change of macroscopically observed mechanical behavior of a dual phase DP500 steel. It was assumed that stress–strain characteristic of a pre-fatigued material may be determined using constitutive equation taking into account damage parameter. To estimate development of the fatigue damage in specimen a variation of the inelastic strain component was applied. The flat "dog-bone" specimens were initially loaded using stress controlled cycles. When the strain reached a given value the fatigue process was stopped. Subsequently, the specimens with introduced fatigue damage were subjected to tensile tests. Next, the Johnson-Cook's constitutive equation was calibrated separately for each pre-fatigue case. Finally, a new constitutive relationship, based on the Johnson-Cook's model was proposed. It reflects the hardening and softening effects by taking into account both a change in the dislocation structure and development of fatigue microdamage. Proposed model shows a very good agreement with experimental data.
Cechy publikacji
original-article
Inne
System-identifier
3238
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