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Abstract

Existing finite element models can predict the behavior of complex anisotropic structures under combined loading. However, these models typically assume a simplified material model, non-distorted orientation of the fiber materials used in the manufacturing process, and the absence of defects such as voids and dry spots. Such assumptions are particularly questionable in areas of high curvature or significant thickness changes. These areas typically have the double effect of being areas of high stress as well as areas susceptible to manufacturing defects.

This paper will discuss preliminary results from a combined experimental and finite element study that shows the effect of local material variations on actual structural performance. The subject of this study is the Solectria Sunrise composite wheel well. The first part of the paper will present results from testing of an actual wheel well; the second part will briefly discuss our recent efforts at studying one particularly critical component: the tapered sandwich structure and its relationship to resin infusion manufacturing defects and fatigue behavior.

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References

1. Lazarus, P. , "Resin infusion of marine composites," 41st International SAMPE Symposium, March 24-28, 1996, pp. 1447-1458.

2. Chen, J. , McBride, T. M. , and Sanchez, S. , "Sensitivity of mechanical properties to braider tow misalignment in triaxial braid composites," J. of Comp Tech and Research, 20(1), pp. 13-17, 1998.

3. Chen, J. , "Process induced distortion in textile composites," in Vol. III, Processingand Mfg, Proc Tenth Int Confon Comp Matls, ed. A. Poursartip and K. N. Street , pp. III-221-III-228, ICCMl OSociety, Woodhead Publ, Vancouver, BC 1995.

4. Bowles, K. J. , and Frimpong, S. , "Void effects on the interlaminar shear strength of unidirectional graphite-fiber-reinforced composite," J. Comp Mails, 26(10), pp. 1487-1509, 1992.

5. Judd, N. C. W. , and Wright, W. W. , "Voids and their effects on the mechanical properties of composites-an appraisal," SA MPE Journal, Jan/Feb 1978, pp. 10-14.

6. Burman, M. and Zenkert, D. , "Fatigue of foam core sandwich beams-2: effect of initial damage," Int. J. Fatigue, 19(7), pp. 563-578, 1997.

7. Patterson, M. , Douglas, C. D. , Sherwood, J. A. , and Chen, J. , "Effect of fillet radius and tape on the tee jointing of advanced composite laminates," Comp Part B: Eng Journal, accepted for publication, 1998.

8. Allen, H. G. , and Shenoi, R. A. , "Flexural fatigue tests on sandwich structures," in Second Int Conf on Sandwich Constructions, ed. D. Weismann-Berman and K.-A. Olsson, EMAS Ltd, Solihull, UK, pp. 499-517, 1989.

9. Chevalier, J. L. , "Creep and fatigue properties of end-grain balsa and other typical sandwich cores," Second Int Conf on Sandwich Constructions, ed. D. Weismann-Berman and K.-A. Olsson , EMAS Ltd, Solihull, UK, pp. 519-539, 1989.

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10. Murri, G. B. , O'Brien, T. K. , and Rousseau, C. Q. , "Fatigue life methodology for tapered composite flexbeam laminates," American Helicopter Society, 53rd Annual Forum, Virginia Beach, VA, April 29-May 1, 1997.

Effect of Local Material Variations on Tapered Sandwich Structures

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