Journal ArticleDOI
Curing Stresses in Composite Laminates
H.T. Hahn,N.J. Pagano +1 more
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In this paper, a method based on total stress-strain-temperature relations is formulated and applied to determine the curing stresses in boron/epoxy composite laminates.Abstract:
Analysis of curing stresses in resin matrix composite laminates involves a temperature range over which variation of elastic moduli is appreciable. A method based on total stress-strain-temperature relations is formulated and applied to determine the curing stresses in boron/epoxy composite laminates. This method is shown to be preferable to the incremental method because the former requires the thermal strains and the stress-strain relations only at the final temperature of interest. The use of incremental constitutive equations is also discussed, and it is shown that proper care must be exercised to insure inclusion of interaction terms that have no counterparts in linear theories.read more
Citations
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Process-Induced Stress and Deformation in Thick-Section Thermoset Composite Laminates:
TL;DR: In this paper, a study of process-induced stress and deformation in thick-section thermosetting composite laminates is presented, and a methodology is proposed for predict ing the evolution of residual stress develop...
Journal ArticleDOI
Fatigue damage modeling of fibre-reinforced composite materials: Review
Joris Degrieck,Wim Van Paepegem +1 more
TL;DR: A review of the major fatigue models and life time prediction methodologies for fiber-reinforced polymer composites, subjected to fatigue loadings is presented in this paper, where the fatigue models have been classified in three major categories: fatigue life models, which do not take into account the actual degradation mechanisms but use S-N curves or Goodman-type diagrams and introduce some sort of fatigue failure criterion; phenomenological models for residual stiffness/strength; and finally progressive damage models which use one or more damage variables related to measurable manifestations of damage (transverse matrix cracks, delamination
Journal ArticleDOI
Bonded repair of composite aircraft structures: A review of scientific challenges and opportunities
TL;DR: In this article, the area of structural bonded repair of composites is broadly reviewed, starting from damage assessment to automation, to identify current scientific challenges and future opportunities, and the authors propose a robust, reliable and repeatable structural bond repair procedures to restore damaged composite components.
Journal ArticleDOI
Process Modeling of Composite Materials: Residual Stress Development during Cure. Part I. Model Formulation
Scott R. White,H.T. Hahn +1 more
TL;DR: In the production of composite parts, the pertinent processing parameters are time, temperature, and pressure, and a judicious choice of these three parameters produces composites which are fully cured.
Journal ArticleDOI
Two-Dimensional Cure Simulation of Thick Thermosetting Composites
TL;DR: In this paper, an investigation into the two-dimensional cure simulation of thick thermosetting composites is presented, where temperature and degree of cure distributions within arbitrary cross-sectional geometries are predicted as a function of the autoclave temperature history.
References
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Journal ArticleDOI
The Influence of Stacking Sequence on Laminate Strength
N. J. Pagano,R. Byron Pipes +1 more
TL;DR: In this article, an approach is presented to predict the detailed stacking sequence of specific layer orientations which leads to optimum protection against delamination under uniaxial static and fatigue loadings.
Strength Characteristics of Composite Materials.
TL;DR: In this article, the strength characteristics of quasi-homogeneous, nonisotropic materials are derived from a generalized distortional work criterion, and a method of strength analysis of laminated composites is delineated using glass-epoxy composites as examples.
Journal ArticleDOI
Transient Thermoelastic Problem for an Infinite Medium With a Spherical Cavity Exhibiting Temperature-Dependent Properties
Development of engineering data on the mechanical and physical properties of advanced composites materials. Final technical report, 1 Jun 1971--30 Nov 1973
K.E. Hofer,N. Rao,D. Larsen +2 more
TL;DR: In this paper, the effect of various environmental variables on the physical, thermal, and mechanical properties of selected resin matrix and metal matrix materials was evaluated in steady state and cyclic thermal, thermo-humidity, and humidity conditions.
Development of Engineering Data on the Mechanical and Physical Properties of Advanced Composites Materials
K E Hofer,D Larsen,V E Humphreys +2 more
TL;DR: In this article, the effect of various environments on the physical, thermal, and mechanical properties of Thornel 300/Narmco 5208 composites were generated on laminate data, including tension, compression, inplane shear, interlaminar shear and flexural static properties.
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