Micromechanical modeling of crack-tip rubber particle cavitational process in polymer toughening

摘要: A simple micromechanical modeling of the rubber particle cavitational process at crack tip was conducted using combination Irwin's stress intensity factor analysis, slip-line field theory, and Dewey's closed-form elastic solution. This unique provides fruitful insights concerning possible role(s) particles piay in front a constrained (plane-strain) tip. The cavitation causes redistribution strain fields around cavitated particles. This, turn, alters state surrounding matrix experiences. Consequently, fracture is affected by event. results analyses suggest that both preexisting holes occurrence serve (i) to relieve plane-strain constraint, (ii) promote shear yielding matrix, (iii) as concentrators. major difference between event lies on sudden buildup octahedral component upon region. Experimental observations toughening mechanisms various rubber-modified polymers support this analyses.