This paper presents buckling studies made on skew plates using finite element. The effects of the skew angle, aspect ratio, length-to-thickness-ratio, fibre orientation angle, and numbers of layers in the laminate and laminate sequence on the critical buckling load factor (Kcr) of antisymmetric composite laminates have also been presented. The critical buckling load factor (Kcr) is found to inc...

Results of an analytical and experimental study to characterize the structural response of two compression-loaded variable stiffness composite panels are presented and discussed. These variable stiffness panels are advanced composite structures, in which tows are laid down along precise curvilinear paths within each ply and the fiber orientation angle varies continuously throughout each ply. Th...

Exposing a laminate structure to thermal cycles and to temperatures close to the curing temperature, followed by mechanical fatigue, cause interlaminar and intralaminar cracks leading to degradation of the mechanical properties. The effect of thermal and mechanical fatigue, as well as thermal aging, on carbon fiber composite laminate structures is under study in the present paper.

The inherent flexibility, the small dimensions as well curvilinear shape of continuum robots makes it challenging to precisely measure their shape. Optical fibers with Bragg gratings (FBGs) provide a powerful tool reconstruct centerline robots. We present theoretical model determine such sensor array based on longitudinal strain measurements and incorporating bending, twisting, elongation. To v...

Laminate Veneerler
 Estetik dental tedavilerde hastaların beklenti ve gereksinimleri günden güne artmaktadır. Dental estetik, kaybettikleri estetik görüntünün yeniden kazandırılmasında son derece önemli bir yer tutmaktadır. Hasta beklentilerinin bu denli yüksek olması, hekimleri daha materyaller kullanmaya hassas tedavi uygulamalarına itmektedir. veneerler hastalara görüntüyü kazandırma no...

In conventional manufacturing processes of composites, Carbon Fibre Reinforced Plastic (CFRP) laminates have been made by stacking unidirectional or woven prepreg sheets. Recently, as a manufacturing process of CFRP, 3D printing of CFRP composites has been developed. The 3D printing process of CFRP composites enables us to fabricate CFRP laminates with arbitrary curvilinear fibre plies. This in...

We investigate the cyclic behavior of laminate microstructures in finite-strain crystal plasticity and the resulting stress-strain response, based on a variational, incremental description of the microstructure evolution. The nonconvex free energy density in multiplicative singleand multi-slip plasticity gives rise to the formation of fine-scale deformation structures, experimentally observed a...

Theoretical models are developed for heat conduction and thermal expansion in a fiber-reinforced ceramic cross-ply laminate containing an array of parallel transverse matrix cracks. Two stages of the transverse matrix cracks are considered : Stage-I with tunnel cracks in the 90” plies aligned parallel to the fibers, and Stage-II with cracks extended across both the 90 and 0” plies with intact f...

Complex multi-lamellar biocomposite structure of Intervertebral Disc (IVD) imparts flexibility between adjacent vertebras, as well as allows transmission of loads from one vertebra to the next along the spine. The disc has a 1525 concentric layered laminate structure; each layer is reinforced by collagen fibers which are aligned at approximately 30 degree angle in successive layers with respect...

Through-thickness stress self-sensing in a quasi-isotropic carbon fiber epoxy–matrix composite by in-plane electrical resistance measurement is effective. The resistance decreases reversibly upon through-thickness compression conducted up to 67 MPa, due to an increase in the proximity between adjacent laminae. The sensing can be attained by measuring the surface resistance in the direction of t...