Hostname: page-component-77c89778f8-swr86 Total loading time: 0 Render date: 2024-07-23T09:06:12.659Z Has data issue: false hasContentIssue false
  • English
  • Français

Evaluation of Impact Damage Resistance in Laminated Composites Using Resins with Different Crosslink Densities

Published online by Cambridge University Press:  10 February 2011

A. J. Lesser
A. J. Lesser*
Affiliation:
Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA 01003
Get access

Abstract

It is generally recognized that fiber-reinforced laminated composites are susceptible to damage resulting from low-velocity impacts. Over recent years, many strategies have been devised to increase the fracture toughness of resin matrix materials with the aim of improving the composites overall resistance to impact damage. One popular strategy for enhancing the fracture toughness of thermosets involves increasing its molecular weight between crosslinks which, in turn, enhances the resins ductility. In this paper, we investigate the efficiency of this toughening approach with regard to resisting damage in composite laminates subjected to lowvelocity impacts. Generic damage characteristics and mechanisms are reviewed and it is shown that two different events occur during the impact process. First, the laminate experiences a local failure which resembles a Hertzian fracture process followed by subsequent delamination between the plies. Results are presented illustrating the effects that systematically increasing the molecular weight between crosslinks of the resin has on each of these mechanisms. Also, the residual compressive strength (Compression After Impact) of the laminates made with these resins is presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 434: Symposium U – Layered Materials for Structural Applications , 1996 , 293
Copyright
Copyright © Materials Research Society 1996

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Reifsnider, K.L., (1989) Handbook of Composites, Herakovich, C. T. et al., eds., Elsivier Science Publishers, Amsterdam Google Scholar
2 Office of Technology Assessment, (1985) New Structural Materials Technologies Opportunities for the Use in Advanced Ceramics and Composites., US Congress Tech. Mem., US Gov. Printing Office, Washington, D.C. Google Scholar
3 Boeing Specification Support Standard, (1982). BSS 7260, Code Ident. No. 81205, Boeing Aerospace, Los Angeles, CA.Google Scholar
4 NASA Reference Publication 1092, (1983). Compiled by ACEE Composites Project Office, Langley Research Center, Hampton, VirginiaGoogle Scholar
5 Lee, S. M., Zahuta, P. (1991) J. of Composite Materials, 25, pp 204–222.Google Scholar
6 Cairns, D. S., Lagace, P. A. (1992) J. of Reinforced Plastics and Composites, 11, pp 395–412.Google Scholar
7 Hull, D., Shi, Y. B. (1993) Composite Structures, 23, pp 99–120.Google Scholar
8 Falabella, R. Olesen, K. A. Boyle, M. A. (1990) Proc. of 35th Int. SAMPE Tech.Conf., pp 1454–1465.Google Scholar
9 Lesser, A.J., Filippov, A.G. (1991) Proc. of 36th International SAMPE Tech. Conf, 36, pp 886–900 Google Scholar
10 Lesser, A.J., Filippov, A.G. (1994) Int. J. of Damage Mechanics, 3, pp 408–432 Google Scholar
11 Bucknell, C. B. (1977) Toughened Plastics, Applied Science, N.Y. Google Scholar
12 Bravenec, L. D., Dewhirst, K. C., Filippov, A.G., (1988) “Lightly Crosslinked Thermosets”, 33rd Int. SAMPE Symposium, March 7–10, pp 1377–1384.Google Scholar
13 Lesser, A.J., Puccini, P.M., Modic, M.J., (1992) “Mechanical Performance of Single and Multiphase Resin Systems under Constrained Stress States”, Society of the Plastics Industry, ERF, March 9–11, pp 120–127 Google Scholar
14 Acton, M. R., Wilks, J. (1989) J. of Material Science, 24, pp 4229–4238.Google Scholar
15 Chaudhri, M. M., Liangyi, C. (1989). J. of Material Science,24, pp 3441–3448 Google Scholar
16 Liu, D. (1988) J. of Composite Materials 22, pp 674–692.Google Scholar