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Masood Shah
Abstract
Investigation of crack propagation in X38CrMoV5 tool steel at room temperature and 600°C on small scale specimens
Masood Shah - 9 November 2010
Forging and high pressure die casting processes impose heavy
mechanical loads on die materials and tools damaging their
surface during production. This study proposes a novel method of
characterisation of the surface damage of tool steels using thin
specimens. Fatigue crack propagation experiments are carried out
on the tool steel X38CrMoV5 at ambient temperature as well as at
600°C. The effect of specimen thickness, load ratio and
temperature on the fatigue crack propagation is studied.
Different fatigue crack propagation parameters are established
using numerical simulations. A method of crack tip opening
displacement measurement is developed. This method is based on
image acquisition with the help of a digital camera and a long
distance microscope followed by an image correlation procedure,
to measure the crack opening displacements. A fatigue crack
propagation model based on crack opening displacement is
developed and compared with traditional propagation models.
Keywords: Crack propagation, Fatigue, Tool steels, CTOD, Image correlation, J integral, Stress intensity factor, Rupture
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