On the cyclic yield surface of some engineering materials under complex stress conditions

• Autorzy: Dietrich L. , Kowalewski Z.
• Języki publikacji: EN

Abstrakty

EN

The paper presents a new method of mechanical parameters analysis. It deals with determination of a "cyclic yield surface" for selected engineering materials on the basis of cyclic curves experimentally obtained under a complex stress state. Location of the cyclic yield surface with respect to that of the initial yield locus may constitute the basis for evoluation of the material sensitivity to the cyclic deformation. Tests have been carried out with the use of PA6 aluminium alloy and 18G2A low-alloy steel, both in the as-received state. The experimental programme was the same for both considered materials. Firstly, an initial yield surface was determined usingn a number of specimens which were loaded up to the plastic range allong different loading paths. Secondly, cyclic predeformations due to various loading paths in the plane stress state were induced by cyclic loading at ambinet temperature under constant [...] and gradually decreasing strain amplitude [...] . Finally, subsequent yield surfaces were determined using the single specimen method. It is shown that depending on the material, a cyclic loading induces softening (low-alloy steel) or hardening (aluminium alloy) effect in the strain range considered. All differences in material responses to cyclic prestraining for the tested materials are discussed in detail.

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Archives of Mechanics
• Rocznik: 1998
• Tom: Vol. 50, nr 5
• Strony: 877--905
• Opis fizyczny: Bibliogr. 21 poz.,Rys., wykr.,

Twórcy

autor

Dietrich L.

autor

Kowalewski Z.

• Prof. dr hab. ; mechanika; mechanika doświadczalna, mechanika ciał odkształcalnych. Instytut Podstawowych Problemów Techniki. Polish Academy of Sciencs, Institute of Fundamental Technological Research