Fatigue Delamination Growth in CFRP Composites: From Pure Mode I and Mode II to Mixed Mode I/II

Abstract

For composite design, it is desirable to have data covering the failure envelope from Mode I to Mode II. The existing standard procedures for quasi-static testing (ISO 15024 for Mode I and ISO DIS 15114 for Mode II) have recently been shown to be adaptable for the respective fatigue tests under displacement control. The Calibrated End-Loaded Split (C-ELS) test set-up developed for Mode II further allows performing a Fixed-Ratio Mixed Mode I/II (FRMM) test by simply inverting the loading direction compared to mode II.