Stress-relaxation occurs in precracked polystyrene specimens accompanied by discontinuous crack growth under fixed displacement conditions. Crack growth is associated with a localized zone of dense crazes. The elliptically shaped craze zone increases in length as well as width with time. A model based on the double layer potential method of elastostatics is proposed to account for the drop in stress due to interactive crack-craze growth. This model successfully explains the observed non-linear stress-relaxation behaviour in terms of crack growth and crazing density.
Посилання на статтю:
Stress-relaxation due to crack-craze interaction / K. Sehanobish*, A. Chudnovskyt and A. Moet // Polymer. – 1993. – Vol 34. – P. 1212-1215.