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Showing 1 to 20 of 20 for “"Polymeric composite"”.
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Mechanics of Fiber-Controlled Behavior in Polymeric Composite Materials
… durability and damage tolerance predictions for composite material systems rely on accurate estimates of the local stress and material states for each of the constituents, as well as the manner in which the constituents interact. In this work, an number of approaches to estimating the stress …
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Impact damage evaluation of high performance polymeric composite material systems
… for six different laminated fiber reinforced composite material systems under investigation at Virginia Tech. A drop weight tower was used to perform impact tests with testing conditions equivalent to those of the tests with the gas gun. Experimental results from the drop weight test procedure …
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Anomaly edge effects in thermographic nondestructive testing of polymeric composite sandwich panels
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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Hybrid Carbon Fiber/ZnO Nanowires Polymeric Composite for Stuctural and Energy Harvesting Applications
… of carbon fiber reinforced polymers (FRPs) composites, they are prone to failure due to delamination. The ability to tailor the fiber/matrix interface FRPs is crucial to the development of composite materials with enhanced structural performance. In this dissertation, ZnO nanowires (NWs) …
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Characterization and Modeling of a Fiber-Reinforced Polymeric Composite Structural Beam and Bridge Structure for Use in the Tom's Creek Bridge Rehabilitation Project
Fiber reinforced polymeric (FRP) composite materials are beginning to find use in construction and infrastructure applications. Composite members may potentially provide more durable replacements for steel and concrete in primary and secondary bridge structures, but the experience with composites …
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Thermally Induced Vibration of a Cross-Ply Laminated Plate with Hygrothermal Effects (Exact Solution)
… structural design is the use of fiber-reinforced polymeric composite material, notably in advanced aircraft and projectiles. These applications expose the materials to varied environmental conditions, therefore the material performance under these conditions is of great interest. One aspect of …
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Polymer Chemistry for Improved Self -Healing Composite Materials
Polymeric composite materials that are able to undergo self-healing through a microcapsule-based mechanism have been developed. The first successful example of this type of material was based on the ring-opening metathesis polymerization of endo-dicyclopentadiene using Grubbs' catalyst. The work …
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CHARACTERIZATION OF SENSING REPAIR MATERIALS
… For the piezoresistive cementitious and polymeric materials the resistivity change was over 10 times more than the engineering strain. A specially designed polymeric composite cantilever beam detected applied pressure as small as 1.4 kPa (~0.2 psi). The compressive stress-strain …
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Material process monitoring with optical fiber sensors
… need to monitor the cure and inservice health of composite materials. We describe the continuation of an effort to design a multi-functional fiber optic sensor which can be embedded in polymeric composite laminates for monitoring the degree of cure during its fabrication, as well as internal …
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Design and development of a novel lightweight long-reach composite robotic arm
… focuses on exploring the feasibility of using polymeric composite materials for the construction of long-reach robotic arms. Different manipulator layouts were investigated and an ideal design was selected for a robotic arm that has a 5 [m] reach, 50 [kg] payload, and is intended to operate on …
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Structure-Property Relationships in Novel Electrospun Composites for Advanced Applications
<p>Active polymeric materials that alter shape in response to an external stimulus offer unique avenues for the design and study of dynamic structures. This research focused on developing elastomeric polymer composites with multiple functionalities by exploring the design and properties for various …
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Mechanical Property Characterization of Polymeric Composites Reinforced by Continuous Microfibers
… on the potential properties of the composites. Experimental techniques are employed to understand the effects of various fibers, their volume fractions and matrix properties in polymer composites. However, these experiments require fabrication of various composites which are time …
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Deformation and Force Characteristics of Laminated Piezoelectric Actuators
… layers together, or to cure the layers made of polymeric composite material, and then cooled to a service temperature. Mainly discussed are actuators that are composed of layers of passive materials and a layer of piezoelectric material. THUNDER (THin layer UNimorph ferroelectric DrivER and …
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Nanostructured composite materials based on carbon nanotubes and 3-D photonic crystals
… electronic and optical properties. Various polymeric composite materials, which were based on carbon nanotubes, have been also developed in an attempt to combine the properties of polymer and CNT in a single film. Such composites were mainly formed by mixing carbon nanotubes within the …
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Structural Analysis of a Pultruded Composite Beam: Shear Stiffness Determination and Strength and Fatigue Life Predictions
… the performance of a particular fiber-reinforced polymeric composite structural beam, a 91.4 cm (36 inch) deep pultruded double-web beam (DWB) designed for bridge construction. Part 1 focuses on calculating the Timoshenko shear stiffness of the DWB and understanding what factors may introduce …
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Multifunctional Composites Using Carbon Nanotube Fiber Materials
<p>Composite materials have high in-plane mechanical properties and are lightweight. Thus laminated composites are widely used in engineering applications. However, interlaminar stresses can arise and lead to premature failure at low in-plane stress levels. This constitutes a fundamental weakness …
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The effect of environmental aging/exposure on the durability of high performance polymeric composites
High-performance polymeric composites are currently being considered as state-of-the-art material systems for future supersonic aircraft and space structures. However, the long-term durability and environmental stability of these materials continue to be under question. Continued application of …
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Introducing Advanced Conductors and Semiconductors in 3D polymeric composites for further electronic & photocatalytic applications
L'abstract è presente nell'allegato / the abstract is in the attachment