... material systems, i.e., carbon/epoxy and glass/epoxy, were investigated in this study, each with three different braiding angles. A theoretical approach, based on a bridging micromechanics model, is employed to predict the tensile properties of the braid composites only using monolithic fiber and matrix...

... of a micromechanics-based simulation to combine the effects of two specified damage mechanisms. Finally, we develop a hybrid approach in which the results from the micromechanics simulations for individual mechanisms are used as inputs to the residual strength model as if they had been obtained from experimental data...

...X-L Gao; S Mall A two-dimensional rule-of-mixtures micromechanics model is presented for planar woven fabric-reinforced composites subjected to in-plane biaxial normal loads. The impregnated warp/fill yarns are treated as orthotropic materials and the interyarn matrix as an isotropic material...

... and segments of those missions. The fatigue life analysis is based on micromechanical stresses which, in turn, are input into a damage summation model. Spectrum loading is decomposed into a series of in-phase and out-of-phase TMF segments whose lives are predicted from a life fraction model which was developed...

..., micromechanics When cooling composites from their high processing to low operating temperatures, thermal stresses are generated due to the mismatch in the coefficient of thermal expansion (CTE) of the fiber and matrix materials. Such stresses may cause some damage and affect the performance of composites...

... and to explain the observed trends in fatigue life as a function of frequency and applied stress level. Comparisons of fatigue behavior with that of SCS-6/Timetal 21S illustrate differences when tested under nominally similar conditions. metal matrix composites (MMCs) micromechanics life prediction...

... monotonic loading and cyclic loading cases. Micromechanical models have also been developed and give good correlation with test results for longitudinal and transverse tension. Loading-unloading-reloading tests enabled the interfacial strength to be determined. The transverse cyclic loading case was modeled...

... to its global stiffness matrix through micromechanics and stiffness averaging technique. The FGM, although proven to be a quick and successful method [ 4 ], suffers two major drawbacks: 1. incompatibility of the basic transverse isotropy assumption with the theoretical mathematical derivation, (i.e...

...CA Bigelow The current work formulated a micromechanical analysis of a cross-ply laminate and calculated the thermal residual stress in a very thick [0/90] ns silicon-carbide/titanium laminate. Results were also shown for a unidirectional laminate of the same material. Discrete fiber-matrix models...

... stress intensity factor, continuum fracture mechanics, micromechanics, interfacial frictional shear stress, discrete-continuum relations Nomenclature a, a0 AA' As, A,, BB' C, n EI, E,, EL Er Current crack length and unbridged initial crack length, mm Superscript referring to crack centerline Cross...

... behavior of the fabric composite was shown to be principallycaused by damage propagation rather than by plastic deformation of the matrix. KEYWORDS: composite materials, fabric, strength, micromechanics, finite element Woven fabric-reinforced composite materials are often used to construct plate or shell...

... treatment, optimal, micromechanics, shear lag Nomenclature a Half length of the yielding region c~ Dimensionless quantity correspond- ~Assistant professor, Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY 13699. 2Alexander Giacco professor, Department of Engineering...

... for decreasing the fiber spacing between two adjacent fibers within a ply. The results indicate that matrix cracking and fiber-matrix debonding are more likely to occur during processing for laminates with higher fiber volume fractions. KEYWORDS:composites, free surface, fiber volume fraction, micromechanics...

..., for the selection of appropriate material properties of the fiber coating were also derived to minimize thermal residual stresses in the matrix during fabrication. composite cylinder closed form micromechanics interphase metal matrix composites References Highsmith , A. L. , Shin , D...

... stresses, although much smaller than the longitudinal stresses, contributed to the plastic deformation of the matrix. The experimental stress-strain curves were favorably compared with the theoretical predictions. Emmanuel E. Gdoutos, 1 Dimitrios Karalekas, 2 and Isaac M. Daniel 3 Micromechanical Analysis...

... content are examined. KEY-WORDS:residual stresses, high-temperature composites, weak interface, transverse loads, micromechanics, finite element The role of the interface between the fiber and matrix of a composite has received a great deal of attention regarding its effects upon mechanical performance...

... (NASA) Lewis Research Center. References Murthy , P. L. N. and Chamis , C. C. , “ ICAN: Integrated Composites Analyzer ,” NASA Report TM-83700, National Aeronautics and Space Administration , Washington, DC, 1984 . Chamis , C. C. , “ Simplified Composite Micromechanics...

... fields, plastic slip, strain concentration factors, moire interferometry,experimental analysis, micromechanics GJ t Specimen Metal Matrix Composite 6 ply leTuP [045] s Boron/Aluminum boron fiber die. =O,14mm 44% fiber by volume Aluminum 6061 annealed Understanding and development of metal-matrix...

... laminate analysis. Key features and capabilities of ICAN are described. A sample input data set and selected output are provided to illustrate its generality/ versatility and user friendly structure. KEYWORDS: computer codes, composite mechanics, micromechanics; macromechanies, structural analysis, stress...