R. Banerjee et Bk. Sarkar, STUDY ON ELASTIC-PLASTIC COMPONENT IN INDENTATION FATIGUE OF SODALIMEGLASS, Bulletin of Materials Science, 19(5), 1996, pp. 759-765
Fracture mechanics studies on glass by indentation has become predomin
ant in recent times. Interest in it has become more prominent due to a
large application of such materials in areas of engineering applicati
ons encountering fluctuating stresses induced thermally, mechanically
or physically. However, glass subjected to repeated indentation at a p
oint prior to crack initiation with subcritical loads phenomenological
to metal fatigue has not been systematically investigated. Repeated i
ndentation at a single point with different subcritical loads (0.1N, 0
.15N, 0.25N, 0.50N, 1.0N) was performed till radial cracks occurred. T
he length of the diagonal was measured after each indentation, which w
as found to increase with indentation cycle eventually leading to crac
k initiation. This observation was analysed considering the elastic pl
astic component and the residual stress developed during each cycle. A
mathematical model has been postulated to correlate the contribution
of cumulative residual stress for crack initiation.