Abstract
The influence of layer thickness and ply interdispersion was investigated on the failure characteristics of multidirectional laminates. The composite material investigated was a high strength carbon fiber composite with a toughened epoxy matrix (IM7/8552). The basic unidirectional material was fully characterized in a previous study under static and dynamic loading conditions. In this study the investigation was extended to angle-ply laminates with varying layer thickness while including the effects of residual stresses. Intralaminar and interlaminar failure mechanisms were observed and found to be strongly related to the layer thickness for the same layup. For thin layer thicknesses failure modes included fiber breaks resulting in higher ultimate strengths. For thicker layers consisting of multiple stacked parallel plies, more matrix dominated intralaminar and interlaminar failures were observed resulting in lower ultimate strengths. This trend reaches a lower limiting plateau as the layer thickness increases. Failure modes and ultimate strengths were further investigated as a function of strain rate. All results were evaluated by the recently developed Northwestern (NU) failure theory.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Altus E, Ishai O (1986) Transverse cracking and delamination interaction in the failure process of composite laminates. Composites Sci Technol 26(1):59–77
Daniel IM, Ishai O (2006) Engineering mechanics of composite materials, 2nd edn. Oxford University Press, New York, p 411, xviii
Pipes RB, Pagano NJ (1970) Interlaminar stresses in composite laminates under uniform axial extension. J Composite Mater 4:538
Pipes RB, Daniel IM (1971) Moire analysis of interlaminar shear edge effect in laminated composites. J Composite Mater 5(Apr):255
Daniel IM et al (2011) Characterization and constitutive modeling of composite materials under static and dynamic loading. Aiaa J 49(8):1658–1664
Daniel IM, Werner BT, Fenner JS (2011) Strain-rate-dependent failure criteria for composites. Composites Sci Technol 71(3):357–364
Daniel IM et al (2009) Interfiber/interlaminar failure of composites under multi-axial states of stress. Composites Sci Technol 69(6):764–771
Schaefer J D, Werner B T,Daniel I.M (2013) Strain rate effects on failure of a toughened matrix composite, in SEM 2013 annual conference & exposition on experimental and applied mechanics 2013. Lombard
Acknowledgement
The work described in this paper was sponsored by the Solid Mechanics Program of the Office of Naval Research (ONR). We are grateful to Dr. Y. D. S. Rajapakse of ONR for his encouragement and cooperation.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2014 The Society for Experimental Mechanics, Inc.
About this paper
Cite this paper
Werner, B.T., Schaefer, J.D., Daniel, I.M. (2014). Effect of Ply Dispersion on Failure Characteristics of Multidirectional Laminates. In: Tandon, G., Tekalur, S., Ralph, C., Sottos, N., Blaiszik, B. (eds) Experimental Mechanics of Composite, Hybrid, and Multifunctional Materials, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-00873-8_17
Download citation
DOI: https://doi.org/10.1007/978-3-319-00873-8_17
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-00872-1
Online ISBN: 978-3-319-00873-8
eBook Packages: EngineeringEngineering (R0)