Ballistic impact on composite panels is studied in this work both experimentally and computationally. The purpose was to develop computational methods to analyze a high speed jet engine fragment impacting on composite targets. 12 inch by 12 inch laminated panels with 8, 16, and 32 plies and the standard +-45, 0 /90 degree stacking sequences were considered. With the nominal ply thickness of 0.0...

Aggressive treatment with antibiotics in patients infected with Streptococcus pneumoniae induces release of the bacterial virulence factor pneumolysin (PLY). Days after lungs are sterile, this pore-forming toxin can still induce pulmonary permeability edema in patients, characterized by alveolar/capillary barrier dysfunction and impaired alveolar liquid clearance (ALC). ALC is mainly regulated ...

Pore-forming proteins are weapons often used by bacterial pathogens to breach the membrane barrier of target cells. Despite their critical role in infection important structural aspects of the mechanism of how these proteins assemble into pores remain unknown. Streptococcus pneumoniae is the world's leading cause of pneumonia, meningitis, bacteremia and otitis media. Pneumolysin (PLY) is a majo...

A novel test configuration has been developed to induce combined stress-states of in-plane longitudinal tension and transverse compression in thin-ply, unidirectional (UD) composite layers. Three different multi-directional laminates have designed incorporating UD carbon/epoxy plies embedded angle-ply blocks the same material. The scissoring deformation induces central layers when is strained 0...

In a fatigue testing programme of carbon/epoxy cross-ply laminates made ultra-thin plies, non-conventional failures are observed. These consist in longitudinal cracks the 90° layer parallel to loading direction instead conventional transverse perpendicular load direction. A potential reason for this failure is presence normal stress thickness Classical Lamination Theory predicts zero values com...

background and aims. anterior esthetic restoration is challenging in pediatric dentistry, due to limited durability and poor retention of the restoration.this study assessed the effect of air abrasion on tensile failure load of composite class iii restorations using different preparation techniques. materials and methods. 100 extracted human anterior primary teeth were divided, based on the pre...

Excessive ply-ply friction can lead to process-induced defects during the hot press forming of thermoplastic composite laminates. Process simulations be used enable first-time-right defect-free manufacturing. However, a good understanding is required improve constitutive models allow simulation more complex parts. We performed experiments on UD C/PAEK tapes, showing typical response with peak f...

This article provides a fully analytical approach for nonlinear equilibrium path of rectangular sandwich plates. The core of structure is made of symmetric cross-ply laminated composite and the outer surfaces are piezoelectric actuators which perfectly bonded to inner core. The structure is subjected to electro-thermo-mechanical loads simultaneously. One side of plate is rested on Pasternak typ...

This paper reviews the shape distortions in a polymer composite, its sources, characterization techniques, and remedies. The distortion may include warpage, spring-in, or change enclosed diameter for flat, angled, circular parts. Residual stresses are considered to be major source of (dimensional instability) laminated composites. These result difference thermal expansion behavior different pli...

This paper introduces new composite architectures using carbon and glass fibre-reinforced epoxy prepregs to achieve gradual failure under bending. The concept is based on a technique developed by the authors design hybrid composites with in tension combined beam theory identify control sequence of plies layups. Two layups are designed standard ply thickness S-Glass sub-laminates made out interm...