... of damages like delamination inside these composite sandwich structures through changes in natural frequency modes. Hence embedded PFCS could be an effective method to monitor the health of the composite sandwich structures’ in-service conditions. Bending strength and failure strain of the composite...

... for delamination analyses of bonded structural shells/plates, which is of practical importance because it greatly reduces the burden of mesh generation for complicated composite structures. It has also been demonstrated that using high-order shell/plate elements can improve the numerical accuracy in general...

... with both PZT-4 ceramic and single-crystal PMN-PT, i.e., Pb ( Mg 1 / 3 Nb 2 / 3 ) O 3 − PbTiO 3 , were investigated for structural health monitoring of composite plates. Fiberglass/epoxy specimens were manufactured with a delamination starter located in the middle of the plate, and were subjected to axial...

... the delamination, and they are determined by modeling the cracked part as two lapped beams jointed together at the corners of both beams. When the magnitude of the applied load is small, the beam deflects, retaining the mutual contact of whole crack faces, but as the applied load reaches a critical value, local...

...Brajabandhu Pradhan; Poosa Ramesh Babu, Ph.D Student The present study encompasses the influence of ply sequence and thermoelastic stress field on asymmetric delamination growth behavior emanating from elliptical holes in laminated fiber reinforced polymeric composites. Results, emphasizing...

... cracking due to out-of-plane normal stress, delamination due to interlaminar stresses, splitting, and fiber fracture. The sequence of evolution of these damages varied with laminate stacking sequence, stress, and temperature. These damages significantly influenced one another and the creep rupture time...

... notched flexure test, in order to determine the energy required for the initiation and growth of an artificial crack. The materials used were made of two types of glass fiber weave ( 2 ∕ 2 Twill, 8H Satin) and a carbon fiber (8H Satin). The matrix was polyetherimide. The delamination energy of these two...

...Brajabandhu Pradhan; Saroja Kanta Panda The present study encompasses the thermoelastic effect of material anisotropy and curing stresses on interlaminar embedded elliptical delamination fracture characteristics in multiply laminated fiber-reinforced polymeric (FRP) composites. Two sets of full...

... conducted by the double-cantilever beam, end-notched flexure, and mixed-mode bending test methods at room temperature, liquid nitrogen temperature (77 K), and liquid helium temperature (4 K). A finite element model was used to perform the delamination crack analysis. Mode I, mode II, and mixed-mode energy...

...S. Leigh Phoenix; A. Kadir Yavuz; Katerina D. Papoulia; C. Yuen Hui In this study, we develop a model for buckling of a partially delaminated composite plate with transverse stitching to resist out of plane deformations. The model applies to carbon fiber/polyimide matrix composites rapidly heated...

...Baoxiang Shan; Assimina A. Pelegri The complex fracture behavior of a cross-ply composite cantilever beam with artificially embedded delamination is investigated analytically, numerically, and experimentally. The analysis of the cantilever beam is divided into two geometric configurations...

...Masaaki Iwasa; Toshio Hattori The fatigue strength of two types of FRP/metal adhesive joints at low temperature, a double lap joint and an embedded joint, was evaluated analytically and experimentally. First, the stress singularity parameters of the delamination edges under mechanical and thermal...

.... 01 February 2000 18 January 2001 damping fracture toughness laminates delamination bending glass fibre reinforced plastics carbon fibre reinforced plastics vibrations Multifunctionality is an intrinsic advantage of composite materials and structures, which are often...

... to verify the fracture mechanisms. A finite element model was used to perform the delamination crack analysis. Critical load levels and the geometric and material properties of the test specimens were input data for the analysis which evaluated the Mode I energy release rate at the onset of delamination...

...Assimina A. Pelegri, Assistant Professor; Diwakar N. Kedlaya, Graduate Student The behavior of delaminated graphite/epoxy composites under variable amplitude compressive loading (spectrum loading) is studied. The delamination growth is monitored in real time during fatigue tests. Different variable...

.... Failure mostly occurs at random times resulting in scattered data. Domain II is a sloping band of progressive damage consisting of fiber-bridged matrix cracking. In this domain, damage initiates in the form of matrix crack and it propagates with crack growth, delaminations and fiber fracture. The lower...

...Valeria La Saponara, Ph.D. candidate; George A. Kardomateas, Professor, ASME Fellow The objective of this paper is to analyze the results of compressive fatigue experiments performed on a set of delaminated Graphite/Epoxy cross-ply composites. Crack branching, the failure mode we are interested...

... laminates notch strength bending crack-edge stress field analysis delamination data reduction Advanced composite materials have been widely used in aerospace structures due to their high specific strengths and elastic moduli. One of the primary failure modes in composite laminates...