EFFECT OF SPECIMEN GEOMETRY ON FATIGUE CRACK GROWTH IN PLANE STRAIN—II. OVERLOAD RESPONSE

Fatigue and Fracture of Engineering Materials and Structures - Tập 13 Số 3 - Trang 297-310 - 1990
Hugh Shercliff1, N.A. Fleck1
1Cambridge University, Engineering Department, Trumpington Street, Cambridge CB2 1PZ, England

Tóm tắt

Abstract— Overload tests were performed on compact tension (CT) and centre cracked panel (CCP) specimens made from 6082‐T6 aluminium alloy and BS4360 50B structural steel. The specimens were sufficiently thick for plane strain conditions to apply. Consistently greater retardation was observed in the CCP geometry than in the CT geometry. The effect of geometry is understood in terms of the T‐stress and its effect on the overload plastic zone size. This was confirmed by biaxial tests in which the T‐stress was varied independently of K. The action of machining off the side faces of an overloaded specimen did not eliminate the retardation; thus overload retardation is not due to a propping open by the surface regions of the specimen. Discontinuous closure was observed after overloads in the aluminium alloy and steel, as predicted by finite element calculations.

Từ khóa


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Fatigue and Fracture of Engineering Materials and Structures

Tập 13 Số 3

297-310

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