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Showing 1 to 20 of 425 for “"Delamination"”.
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Structural Wireless Delamination Sensor
… a layered composite is commonly referred to as delamination and occurs due to various reasons, such as corrosion and fatigue of the structure. Structural integrity can be enhanced by monitoring delamination and, ideally, to have a sensor that can continuously monitor the delamination extent. The …
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Dynamic delamination of patterned thin films
… leading to the inertia-driven interface delamination. A weak adhesive layer is selectively introduced at the interface to serve as a pre-crack exploiting the inertial effect to obtain stable crack growth. The kinetic energy imparted to the weakly bonded region of the film is converted …
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Propagation of delamination in layered anisotropic cylinders
The propagation of delamination in a layered anisotropic cylinder is studied under different loading conditions. Initially, a closed-form solution is obtained for an infinitely long cylinder by treating it as a thin shell, with an axisymmetric crack in the adhesive layer between two laminae, and an …
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Failure of graphite/epoxy induced by delamination
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Delamination initiation in postbuckled dropped-ply laminates
… graphite-epoxy laminated plates for the delamination mode of failure is studied by analysis and corroborated with experiments. The nonlinear response of the test specimens is modeled by a geometrically nonlinear finite element analysis. The methodology for predicting delamination is based …
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Micromechanical models of delamination in aluminum-lithium alloys
… fracture intergranularly via a mechanism called delamination cracking. While secondary delamination cracks can improve the effective toughness of a component, no current model accurately predicts the initiation and growth of intergranular cracks. Since simulations cannot incorporate delamination …
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Characterization of Delamination in 2099-T861 Aluminum-Lithium
… exhibit a non-traditional failure mechanism, delamination. Delamination refers to the failure along the grain boundary interface. The delamination phenomenon is often observed from fracture toughness testing as cracking along grain boundaries perpendicular to the mode I primary crack. In this …
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Interfacial spallation/delamination properties of self-assembled monolayers
… (MD) simulations and laser-induced spallation/delamination tests to quantify the strength and toughness of SAM-enhanced interfaces. Though the results obtained from MD simulations and experimental observations yielded similar trends in comparing the contribution of various SAMs, their actual …
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Mechanics of inelastic deformation and delamination in paperboard
… model is developed to model the out-of-plane delamination behavior of paperboard. The onset of interface separation is controlled by a limit surface in the normal-shear traction space. The limit surface is taken to shrink with a monotonically-increasing scalar internal variable reflecting …
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Surface traction and crack propagation in delamination wear
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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Tribology and interfacial delamination of thin film systems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990.
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Detecting Delamination in Carbon Fiber Composites Using Piezoresistive Nanocomposites
… different lightweight aerospace applications. Delamination is a critical failure mode in these composite materials. As composite plies separate from each other, the composite loses some of its ability for supporting expected loads. Therefore, detection of delamination at right time is a …
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HYGROTHERMALLY-INDUCED DELAMINATION AND CRACKING IN PLASTIC IC PACKAGES
… around the defects leading to debonding and delamination growth. If the total stress intensity factor generated by the loading due to the hygrothermal stresses and steam pressure is higher than the interfacial fracture toughness, the interfacial cracks will grow and finally cause popcorn …
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Emergence of Delamination Fractures around Casing and Its Stability
The cement sheath failures and nearby wellbore failures may lead to upward flow of drilling fluid or formation fluid, which may have significantly adverse consequences like loss of reserve and environmental hazards. In order to maintain wellbore integrity in the long term, it is expedient to …
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Relating polymer matrix composite delamination behavior to constituent properties
… properties, but no such method is available for delamination properties. This thesis explores the issues associated with predicting polymer matrix composite Mode I delamination behavior from constituent properties by examining the topic from a variety of perspectives. Nanoindentation tests of …
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A fundamental study on the delamination theory of wear.
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Delamination in reinforced concrete retrofitted with fiber reinforced plastics
… system can become more brittle, often involving delamination of the composite. This study investigates failure modes including delamination with the use of fiber reinforced plastics to rehabilitate various concrete structures. The focus is on delamination and its causes, specifically in the …
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Variable complexity modeling of postbuckled stiffeners for delamination initiation
Delamination at the free edge is analyzed as a mode of failure for uniaxial compression of postbuckled structural components. Analyses are performed for I-section stiffeners and for a dropped-ply laminate, all of which failed due to free edge delamination in earlier experimental studies. These …
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Instability-related delamination growth of embedded and edge delaminations
… in composite laminates that have a near-surface delamination. This buckling causes load redistribution and secondary loads, which in turn cause interlaminer stresses and delamination growth. The goal of this research effort was to enhance the understanding of this instability-related delamination …
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Delamination buckling, postbuckling, and growth in axially loaded beam-plates
… isotropic, these cracks will be referred to as delaminations. Buckling, postbuckling, and growth of delaminations in these beam-plates will be analyzed. A finite element method in which all of the terms of the stiffness matrices are obtained by exact integration is employed to determine the …
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