Assessment of temperature-dependent fracture behavior with different fracture mechanics concepts on examples of unoriented and cold-rolled polypropylene

摘要: Applicability of different fracture mechanics concepts, including linear elastic (LEFM), equivalent energy concept, and elastic-plastic (EPFM), to assessing the temperature-dependent behavior was compared using examples an unoriented a cold-rolled polypropylene under quasistatic dynamic loading. Under loading, toughness values were determined from recorded load versus load-line displacement curves on compact tension (CT) specimens. Fracture loading deflection single edge-notched bend (SENB) In spite its simplicity as engineering design parameter, basis LEFM stress intensity factor K can only be validly used in limited temperature range. Instead, EPFM parameters (i.e., J integral crack opening (COD) concepts) applied over wider © 1997 John Wiley & Sons, Inc. Appl Polym Sci 66: 1237–1249,