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Record Details

Record 96 of 9723
Effects of mechanical and thermal cycling on composite and hybrid laminates with residual stresses
Author and Affiliation:
Daniel, I. M.(IIT Research Inst., Chicago, IL, United States)
Liber, T.(IIT Research Institute, Chicago, Ill., United States)
Abstract: The effects of tensile load cycling and thermal cycling on residual stiffness and strength properties of the following composite and hybrid angle-ply laminates were studied: boron/epoxy, boron/polyimide, graphite/low-modulus epoxy, graphite/high-modulus epoxy, graphite/polyimide, S-glass/epoxy, graphite/Kevlar 49/epoxy, and graphite/S-glass/epoxy. Specimens of the first six types were mechanically cycled up to 90% of static strength. Those that survived 10 million cycles were tested statically to failure, and no significant changes in residual strength and modulus were noted. Specimens of all types were subjected to thermal cycling between room temperature and 411 K for the epoxy-matrix composites and 533 K for the polyimide-matrix composites. The residual strength and stiffness remained largely unchanged, except for the graphite/low-modulus epoxy, which showed reductions in both of approximately 35%. When low-temperature thermal cycling under tensile load was applied, there was a noticeable reduction in modulus and strength in the graphite/low-modulus epoxy and some strength reduction in the S-glass/epoxy.
Publication Date: Jan 01, 1977
Document ID:
19780056399
(Acquired Dec 01, 1995)
Accession Number: 78A40308
Subject Category: COMPOSITE MATERIALS
Document Type: Conference Proceedings
Publication Information: (SEE A78-40301 17-31)
Publisher Information: United States
Meeting Information: Annual Meeting on Recent advances in engineering science; November 14-16, 1977; Bethlehem, PA
Financial Sponsor: NASA; United States
Organization Source: IIT Research Inst.; Chicago, IL, United States
Description: 10p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: COMPOSITE MATERIALS; FATIGUE LIFE; LAMINATES; RESIDUAL STRESS; TENSILE STRENGTH; THERMAL CYCLING TESTS; BORON-EPOXY COMPOSITES; EPOXY RESINS; GRAPHITE-EPOXY COMPOSITES; KEVLAR (TRADEMARK); POLYIMIDE RESINS
Imprint And Other Notes: In: Recent advances in engineering science; Proceedings of the Fourteenth Annual Meeting, Bethlehem, Pa., November 14-16, 1977. (A78-40301 17-31) Bethlehem, Pa., Lehigh University, 1977, p. 237-246. NASA-supported research.
Availability Source: Other Sources
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