Damage tolerance capability

This paper is dedicated to my friend and colleague Professor Dr Jaap Schijve, required to retire like many good aircraft components according to a «safe life» criterion but who is still young in mind, body and spirit, has not yet reached his unfactored endurance limit, and who could continue subject to a needed change in philosophy to «retirement for cause». Professor Schijve has dedicated his life to aviation safety through his outstanding continuous research into aircraft fatigue and fracture phenomena. The Federal Aviation Administration, whose primary goal is aviation safety, is indebted to Professor Schijve for his continous counsel through many contributions to the literature in his subject