Energy based study of quasi-static delamination as a low cycle fatigue process

Energy based study of quasi-static delamination as a low cycle fatigue process

Amaral, L.
Yao, L.
Alderliesten, R.C.
Benedictus, R.

Aerospace Engineering

Aerospace Structures and Materials

2015-06-01

This work proposes to treat quasi-static mode I delamination growth of CFRP as a low-cycle fatigue process. To this end, mode I quasi-static and fatigue delamination tests were performed. An average physical Strain Energy Release Rate (SERR), derived from an energy balance, is used to characterize the energy released in crack extension. The physical SERR is then compared to the SERRs calculated by the ASTM standard, and the physical background of the standard is questioned. Furthermore, when normalizing the physical SERR for fatigue delamination by the one obtained for quasi-static crack extension, a stress ratio dependence is observed. This stress ratio effect is physically explained to be present due to the relation between quasi-static and fatigue loading at high stress ratios.

http://resolver.tudelft.nl/uuid:23f260da-c0cc-4e23-97c8-57c21b9efa50

VTT Technical Research Centre of Finland

978-951-38-7442-1

Proceedings of the 34th Conference and the 28th Symposium of the ICAF, Helsinki, Finland, 1-5 June 2015; Authors version

Institutional Repository

conference paper

(c) 2015 The Author(s)