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A contribution to the rigid fibre pullout problem
Effect of alumina dispersions on the thermal conductivity/diffusivity and thermal s~ess resistance of a borosilicate glass Hasselman, D.P.H., Zdaniewski, W.A., Swearengen, .J.C., and Beauchamp, E.K. Journal of Materials Science Vol 15 (1980) pp 518-520 This work suggests that by incorporating a high conductivity crystalline phase in the glassy material, the resistance to the initiation of thermal fracture of a glass can be significantly improved. High strength silicon carbide fibrereinforced glass-matrix composites Prewo, K.M., and Brennan, J.J. Journal of Materials Science Vo115 (1980) pp 463-468 Two silicon carbide fibre forms, a 140 ~m diameter monofilament and a 10 /~m diameter filamentary yarn, were incorporated into a matrix of borosilicate glass. Composite thermal expansion was found to be nearly independent of fibre orientation indicating that multiaxiaUy reinforced composites should be easily fabricated without extensive cracking.
GENERAL
Approximate Mode 1 velocity correction factor for 0 ° unidirectional fibre composites Kousiounelos, P.N. and Williams, J.H. Jr. Fibre Science and Technology Iiol 13 No 2 (March-April 1980) pp 97118 An approximate Mode 1 dynamic crack extension force for a highly orthotropic 0 ° unidirectional fibre composite is derived in terms of the quasistatic crack growth extension force and a velocity correction factor. Complete dynamic analogies are given and the derived orthotropic velocity correction factor is compared with various isotropic velocity correction factors. A contribution to the rigid fibre pullout problem Phan-Thien, N. Fibre Science and Technology Vol 13 No 3 (May-June 1980) pp 179-186 A solution to the problem of fibre pull-out is developed, which is based on the slender-body theory and the Mindlin solution of a concentrated force acting at a distance from the
COMPOSITES. OCTOBER 1980
boundary of an infinite elastic halfspace. It is assumed that the fibre is rigid and that its aspect ratio is large. It is shown that the shear stress is uniform along the fibre (except at the ends) and is inversely proportional to the term Roln(21/Ro) (where Ro is a representative radius of the fibre and l is the embedded length).
Deflection response of general laminated composite plates to in-plane and transverse loads Giri, J. and Simitses, G.J. Fibre Science and Technology Vol 13 No 3 (May-June 1980) pp 225-242 A method is presented for determining the deflectional response of a completely general layered anisotropic, simply-supported, rectangular plate subjected to both uniform in-plane loads (biaxial compression and shear) and a distribution transverse load.
Dynamic stability of generally orthotropic beams Huang, C.C. Fibre Science and Technology Vol 13 No 3 (May-June 1980) pp 187-198 A method of computing the instability regions of generally orthotropic beams is presented. The effect of fibre orientation on the dynamic stability characteristics of such beams has been studied: the numerical results indicate that the regions of instability vary erratically with the fibre orientation angle. Flexural stiffness of multi-ply paperboard Carlsson, L.A. and Fellers, C.N. Fibre Science and Technology Vol 13 No 3 (May-June 1980) pp 213-223 An equation for calculating the flexural stiffness of multi-ply paperboard has been derived using classical lamination theory. The equation was tested using homogeneous and three-ply boards: good agreement between calculated and measured values of the flexural stiffness was obtained, provided that the specific elastic modulus and density of the plies were correctly measured. The practical significance of the equation was demonstrated by investigating the optimum flexural stiffness of a multi-ply board containing groundwood pulp and a chemical pulp. Fracture mechanism of plant fibres McLaughlin, E. C. and Tait, R. A.
Journal of Materials Science Vol 15 (1980) pp 89-95 An extensive study of the mechanism of failure in tension of cellulose-based fibres for a variety of plant species is reported. The development of a cylindrical cell model assisted in establishing a major dependence of mean tensile strength on the product of cellulose dry weight per cent and the square of the cosine of the microfibril winding angle. Fracture of a brittle composite: influence of elastic mismatch and interracial bonding Khaund, A. K., Nicholson, P. S. Journal of Materials Science Vol 15 (1980) pp 177-187 The influence of the presence or absence of elastic mismatch between the dispersed and matrix phases on local crack particle interactions in brittle composites is reported. The optimum toughness for a brittle composite results when the elastic rigidity modulus for the inclusion is less than that of the matrix, and the interfacial bond strength is sufficient to allow plastic deformation of the dispersed phase. Inelastic finite element analysis of a heterogeneous medium exhibiting temperature and moisture dependent material properties Miller, A. K. and Adams, D. F. Fibre Science and Technology Vol 13 No 2 (March-April 1980) pp 135-153 A pseudo-threee-dimensional finite element method is presented for the analysis of the microstress state in a fibre-reinforced material. The method is based on a slightly revised definition of the generalized plane strain conditions. Both inelastic and anistropic (transversely isotropic) material properties are included in the analysis. The dependence of the material properties on temperature and/or moisture is extended into the inelastic material range, and a numerical example showing the importance of including the temperature dependence of the constitutive material properties when analysing a fibre-reinforced composite material is presented. A micromechanical prediction of initial yield surfaces of unidirectional composites Wakaslima K., Suzuki, Y. and Umekawa, S. Journal of Composite Materials Vo113 {1979)p 288 An initial yield criterion has been de-
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GENERAL
Approximate Mode 1 velocity correction factor for 0 ° unidirectional fibre composites Kousiounelos, P.N. and Williams, J.H. Jr. Fibre Science and Technology Iiol 13 No 2 (March-April 1980) pp 97118 An approximate Mode 1 dynamic crack extension force for a highly orthotropic 0 ° unidirectional fibre composite is derived in terms of the quasistatic crack growth extension force and a velocity correction factor. Complete dynamic analogies are given and the derived orthotropic velocity correction factor is compared with various isotropic velocity correction factors. A contribution to the rigid fibre pullout problem Phan-Thien, N. Fibre Science and Technology Vol 13 No 3 (May-June 1980) pp 179-186 A solution to the problem of fibre pull-out is developed, which is based on the slender-body theory and the Mindlin solution of a concentrated force acting at a distance from the
COMPOSITES. OCTOBER 1980
boundary of an infinite elastic halfspace. It is assumed that the fibre is rigid and that its aspect ratio is large. It is shown that the shear stress is uniform along the fibre (except at the ends) and is inversely proportional to the term Roln(21/Ro) (where Ro is a representative radius of the fibre and l is the embedded length).
Deflection response of general laminated composite plates to in-plane and transverse loads Giri, J. and Simitses, G.J. Fibre Science and Technology Vol 13 No 3 (May-June 1980) pp 225-242 A method is presented for determining the deflectional response of a completely general layered anisotropic, simply-supported, rectangular plate subjected to both uniform in-plane loads (biaxial compression and shear) and a distribution transverse load.
Dynamic stability of generally orthotropic beams Huang, C.C. Fibre Science and Technology Vol 13 No 3 (May-June 1980) pp 187-198 A method of computing the instability regions of generally orthotropic beams is presented. The effect of fibre orientation on the dynamic stability characteristics of such beams has been studied: the numerical results indicate that the regions of instability vary erratically with the fibre orientation angle. Flexural stiffness of multi-ply paperboard Carlsson, L.A. and Fellers, C.N. Fibre Science and Technology Vol 13 No 3 (May-June 1980) pp 213-223 An equation for calculating the flexural stiffness of multi-ply paperboard has been derived using classical lamination theory. The equation was tested using homogeneous and three-ply boards: good agreement between calculated and measured values of the flexural stiffness was obtained, provided that the specific elastic modulus and density of the plies were correctly measured. The practical significance of the equation was demonstrated by investigating the optimum flexural stiffness of a multi-ply board containing groundwood pulp and a chemical pulp. Fracture mechanism of plant fibres McLaughlin, E. C. and Tait, R. A.
Journal of Materials Science Vol 15 (1980) pp 89-95 An extensive study of the mechanism of failure in tension of cellulose-based fibres for a variety of plant species is reported. The development of a cylindrical cell model assisted in establishing a major dependence of mean tensile strength on the product of cellulose dry weight per cent and the square of the cosine of the microfibril winding angle. Fracture of a brittle composite: influence of elastic mismatch and interracial bonding Khaund, A. K., Nicholson, P. S. Journal of Materials Science Vol 15 (1980) pp 177-187 The influence of the presence or absence of elastic mismatch between the dispersed and matrix phases on local crack particle interactions in brittle composites is reported. The optimum toughness for a brittle composite results when the elastic rigidity modulus for the inclusion is less than that of the matrix, and the interfacial bond strength is sufficient to allow plastic deformation of the dispersed phase. Inelastic finite element analysis of a heterogeneous medium exhibiting temperature and moisture dependent material properties Miller, A. K. and Adams, D. F. Fibre Science and Technology Vol 13 No 2 (March-April 1980) pp 135-153 A pseudo-threee-dimensional finite element method is presented for the analysis of the microstress state in a fibre-reinforced material. The method is based on a slightly revised definition of the generalized plane strain conditions. Both inelastic and anistropic (transversely isotropic) material properties are included in the analysis. The dependence of the material properties on temperature and/or moisture is extended into the inelastic material range, and a numerical example showing the importance of including the temperature dependence of the constitutive material properties when analysing a fibre-reinforced composite material is presented. A micromechanical prediction of initial yield surfaces of unidirectional composites Wakaslima K., Suzuki, Y. and Umekawa, S. Journal of Composite Materials Vo113 {1979)p 288 An initial yield criterion has been de-
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