Response of Composite Laminates to Contact Loads and Relationship to Low-Velocity Impact
- 1 December 1993
- journal article
- research article
- Published by SAGE Publications in Journal of Composite Materials
- Vol. 27 (15), 1443-1464
- https://doi.org/10.1177/002199839302701502
Abstract
Experimental results are presented for contact and low-velocity-impact re sponses of composite laminates by rigid spheres. The contact phenomenon is different in small and large indentation stages, which is due to occurrence of laminate damage. The contact force corresponding to the onset of laminate damage is found to be independent of the indentor size. In the small indentation stage where the plate is intact, the change of laminate stacking sequence has an insignificant effect on the force-indentation relation ship. However, the force-indentor size relationship does not follow the modified contact law for thin laminates indented by large indentors. Beyond the small indentation stage, damage occurs. The size of the delamination area is proportional to the applied loads and the number of repeated loading cycles. The passage of the delamination crack front can be detected using strain gauges. Also, the indentation spring becomes stiffer under repeated loading. Finally, the delamination damage and the strain history in a laminate at low- velocity impact are found to be very similar to those in the contact test except that vibra tion was observed in the impact test.Keywords
This publication has 11 references indexed in Scilit:
- Effect of damage on the impact response of composite laminatesPublished by American Institute of Aeronautics and Astronautics (AIAA) ,1991
- Impact perforation of carbon fibre reinforced plasticComposites Science and Technology, 1990
- Impact-Induced Fracture in Laminated Plates and ShellsJournal of Composite Materials, 1990
- Strength loss in composites from lateral contact loadsComposites Science and Technology, 1990
- The influence of varying projectile mass on the impact response of CFRPComposite Structures, 1989
- Residual Strength of a Carbon/Epoxy Composite Material Subjected to Repeated ImpactJournal of Composite Materials, 1988
- Impact-Induced Delamination—A View of Bending Stiffness MismatchingJournal of Composite Materials, 1988
- Thick Composite Plates Subjected to Lateral LoadingJournal of Applied Mechanics, 1987
- Use of Statical Indentation Laws in the Impact Analysis of Laminated Composite PlatesJournal of Applied Mechanics, 1985
- Exact Solutions for Rectangular Bidirectional Composites and Sandwich PlatesJournal of Composite Materials, 1970