Shear dominated failure mechanisms in high temperature graphite/polymer matrix composites

• Autorzy: Kumosa M.
• Konferencja: Summer School Of Fracture Mechanics. Current Research On Fatigue And Fracture/sympozjum (VII ; 18-22.06.2001 ; Opole - Pokrzywna, Poland)
• Języki publikacji: EN

Abstrakty

EN

This presentation summarizes recent activities in the Center for Advanced Materials and Structures at the University of Denver toward the development of experimental and computational methodologies to facilitate the analyses of failure/fracture mechanisms and residual thermal stresses in unidirectional and woven graphite/PMR-15 composites subjected to biaxial shear dominated loads. Over the last three years, both the losipescu and off axis tests have been applied to determine the mechanical response of unidirectional and woven graphite/polyimide composites. The most recent experimental and computational results are presented in this paper. In addition, a new methodology developed to evaluate residual thermal stresses in unidirectional and woven polymer matrix composites is demonstrated. This method is based on the X-ray diffraction measurements of residual strains inside metallic particles/inclusions embedded in the composites. Interlaminar residual stresses in unidirectional and woven graphite/polyimide composites are presented.

Słowa kluczowe

EN

graphite/polymer matrix composites; high temperature; failure mechanisms; residual thermal stresses

• Wydawca: Oficyna Wydawnicza Politechniki Opolskiej
• Czasopismo: Zeszyty Naukowe. Mechanika / Politechnika Opolska
• Rocznik: 2001
• Tom: z. 67
• Strony: 147--162
• Opis fizyczny: Bibliogr. 10 poz., il., schem., tab.

Twórcy

autor

Kumosa M.

• Center for Advanced Materials and Structures Department of Engineering University of Denver Denver, Colorado 80208

Bibliografia

• [1] Searles K., Odegard G., Kumosa M. and Castelli M., 1999, "Failure Investigation of Graphite/Polyimide Fabric Composites at Room and Elevated Temperatures Using the Biaxial losipescu Test", Journal of Composite Materials, Vol. 33, No. 22, pp. 2038-2079.
• [2] Odegard G., Searles K., Kumosa M., 2000, "Nonlinear Analysis of Woven Fabric-Reinforced Graphite/PMR-15 Composites under Shear-Dominated Biaxial Loads". Mechanics of Composite Materials and Structures Vol. 7, pp. 129-152.
• [3] Odegard G., 2000,"Shear Dominated Biaxial Failure Analysis of Polymer Matrix Composites at Room and Elevated Temperatures", Ph.D. Thesis, Department of Engineering, University of Denver, Denver, Colorado.
• [4] Searles K., 2000, "The Elastic and Inelastic Behavior of Woven Graphite Fabric Reinforced Polyimide Composites", Ph.D. Thesis, Department of Materials Science and Engineering, Oregon Graduate Institute, Portland, Oregon.
• [5] Odegard G, Armentrout D., Searles K., Kumosa L., Sutter J.K. and Kumosa M., 2001, "Failure Analysis of ±45° Off-Axis Woven Fabric Composite Specimens", Journal of Composites Technology & Research, in press.
• [6J Kumosa M., Odegard G., Armentrout D., Kumosa L., Searles K. and Sutter J.K.: Comparison of the ±45° Off-Axis and losipescu Shear Tests for Woven Fabric Composite Materials, 2001, Journal of Composites Technology & Research, submitted.
• [7] Predecki P. and Barrett C.S., 1979, "Stress Measurement in Graphite/Epoxy Com¬posites by X-Ray Diffraction from Fillers, "J. Composite Materials, Vol. 13, pp. 61-71.
• [8] Predecki P and Barret C.S., 1981, "Residual Stresses in Resin Matrix Composites", In E. Kula, editor, 28th Sagamore Army Materials Research Conference, Lake Placid, July 13-17, pp. 409-424.
• [9] Barrett C. S. and Predecki P., 1980, "Stress Measurements in Graphite/Epoxy Uniaxial Composites by X-Rays" , Polymer Composites, Vol. 1, pp. 2-6.
• [10] Benedikt B., Kumosa M., Predecki P.K., Kumosa, L., Castelli, M.G. and Sutter, J.K., 2000, "An Analysis of Residual Thermal Stresses in a Unidirectional Graphite/PMR-15 Composite Based on the X-Ray Diffraction Measurements," Composites Science and Technology". in press.