Fatigue and Residual Strength Behaviour of ARALL2 Panels with Bonded-On Doublers

摘要

Fatigue crack growth and residual strength tests were done on ARALL2 (2/1)laminates with bonded-on doublers. The main test variables were the shape of the doubler (square and fingertip) and the thickness of the doubler (0.5 and 0.8 mm). All coupons had a starter notch in the outer aluminium face sheet of the ARALL2 laminate at the edge of the doubler. Each coupon was fatigue tested to a predetermined crack length and subsequently loaded to failure in a static test to determine and residual strength.