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Applied Composite Materials: An International Journal for the Science and Application of Composite Materials (v.5, #1)
Buckling Of Laminated Plates with Random Material Characteristics by S. Salim; N. G. R. Iyengar; D. Yadav (pp. 1-9).
This paper models the effect of material parameter randomness on the initial buckling load of rectangular, specially orthotropic, composite laminates. The basic formulation for stability analysis is based on classical laminate theory. A perturbation technique is used to obtain the solution of the governing equation. The effects of aspect ratio and change in standard deviation of the input parameters have been investigated for several laminate configurations. The solution has also been checked with the help of Monte Carlo simulation.
Keywords: composite plates; randomness in properties; buckling
A Comparison of Transverse Cracking Phenomena in (0/90)s and (90/0)s CFRP Laminates by P. A. Smith; L. Boniface; N. F. C. Glass (pp. 11-23).
The development of 90° ply cracking in the surface plies of (90/0)s CFRP laminates from two material systems, HTA/F922 and HTA/F927, has been studied experimentally and the results compared with previous work on (0/90)s lay-ups from the same systems. The trends of the results are shown to be consistent with other published literature. The role of defects in crack initiation and the implications for using a fracture mechanics approach to model the observed behaviour are discussed.
Keywords: crossply laminates; surface 90° ply cracking; crack density; defects; fracture mechanics
An Investigation of the Effects of Layer Architecture on Tensile Damage Mechanisms in a Silicon Carbide (SiC) Fiber-Reinforced Titanium Matrix Composite by O. Jin; Y. Li; W.O. Soboyejo (pp. 25-47).
This paper presents the results of recent studies of the effects of layer architecture (±45° and 0/±45°) on deformation and cracking phenomena in Ti-15-3/SCS-6 (SiC) composites. Deformation and cracking phenomena were elucidated by microscopic observations during incremental loading to failure. The initial damage occurred early via debonding between the fibers and the predominantly TiC reaction layer. This was followed by a complex sequence of damage that included: matrix cracking, sub-grain formation, stress-induced alpha phase precipitation, microvoid nucleation and coalescence, fiber fracture and catastrophic failure. Fracture in the [±45°]2s composite occurred by shear mechanisms. However, an axial failure mode was observed in the [0±45°2s composite. The composite strengths are compared with empirical estimates obtained from the Tsai–Hill criterion.
Keywords: tensile property; damage mechanisms; titanium alloy; SiC fibers; metal matrix composites; layer Architecture
An Assessment of the Double-Notch Shear Test for Interlaminar Shear Characterization of a Unidirectional Graphite/Epoxy under Static and Fatigue Loading by Mahmood M. Shokrieh; Larry B. Lessard (pp. 49-64).
This research explores a modified testing technique for measuring interlaminar shear properties of orthotropic composite materials. An existing test method (double-notched test method) is examined here to characterize the interlaminar shear properties (strength and fatigue life) of a unidirectional ply under both static and fatigue loading conditions. No complicated fixture is required for the testing method which is beneficial for fatigue testing of the materials. The testing method is verified by a finite element technique where an optimized geometry for the specimen is found. AS4/3501-6 graphite/epoxy material is used in this study. The experimental results show that final failure occurs in the gage area for both static and fatigue loading conditions. Moreover, a reasonable amount of scatter for both the static strength and fatigue life is achieved.
Keywords: composites; interlaminar shear test method; static; fatigue; characterization; double-notched test