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Delayed hydride cracking (DHC) tests were conducted on Zr–2.5Nb compact tension (CT) specimens with 60–80ppm H at temperatures ranging from 160 to 280°C in the load increasing mode where the applied stress intensity factor, K I was increased step-wise by 0.5MPam −1/2 from 4.5MPam −1/2 until a crack grew. Critical hydride lengths, l c , corresponding to the spacing of...