Compressive failure of impacted NCF composite sandwich panels - Characterisation of the failure process
2004 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 38, no 6, 495-514 p.Article in journal (Refereed) Published
In the present study, non-crimp fabric (NCF) composite face sheet sandwich panels have been tested in compression after impact (CAI). Damage in the face sheets was characterised by fractography. Compression after impact loaded panels were found to fail by plastic fibre microbuckling (kinking) in the damaged face sheet. Studies of panels for which loading was interrupted prior to failure revealed extensive stable kink band formation at several positions and in numerous plies. Kink bands initiated and propagated within a wide region close to the point of impact. In addition, kink bands initiated in zones with high shear stresses, away from the impact centre line. Consequently, the fractographic results from this investigation do not support the assumption of modelling the impact damage as an equivalent hole. To achieve accurate predictions of kink band initiation, the stress field must be known. The results from this study imply that bending effects caused by remaining dent or material eccentricities in the damaged region must be considered.
Place, publisher, year, edition, pages
2004. Vol. 38, no 6, 495-514 p.
CAI, CFRP, Damage tolerance, Fractography, Sandwich
Reliability and Maintenance
IdentifiersURN: urn:nbn:se:kth:diva-5616DOI: 10.1177/0021998304040559ISI: 000220671000003ScopusID: 2-s2.0-1842526619OAI: oai:DiVA.org:kth-5616DiVA: diva2:10043
QC 201101192006-04-272006-04-272012-09-11Bibliographically approved