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Showing 1 to 14 of 14 for “"fiber failure"”.
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Modeling and Interpretation of Fiber Orientation-Based Failure Mechanisms in Machining of Carbon Fiber-Reinforced Composites
Fiber-reinforced polymer composites have recently emerged as novel materials capable of playing a unique role in industrial applications. The advantage of these materials over traditional metals or polymers comes from the material property enhancements that can be achieved by combining appropriate …
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Response and Failure of Internally Pressurized Elliptical Composite Cylinders
… those of a circular cylinder. An evaluation of failure using the maximum stress and Hashin failure criteria and geometrically linear and nonlinear analyses is presented for elliptical cylinders. These failure criteria involve interlaminar shear stresses which are computed by integrating the …
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An experimental and numerical study of notch sensitivity of ARALL laminates
… Based on the experimental observations, a failure mechanism has been proposed for notched ARALL laminates. The failure of 0° ARALL laminates is governed by fiber failure in the aramid/epoxy layer. Experimental results for the off-axis elastic properties are compared with the predictions …
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Fatigue Life of Hybrid FRP Composite Beams
As fiber reinforced polymer (FRP) structures find application in highway bridge structures, methodologies for describing their long-term performance under service loading will be a necessity for designers. The designer of FRP bridge structures is faced with out-of-plane damage and delamination at …
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FAILURE MECHANISMS OF ULTRA HIGH MOLAR MASS POLYETHYLENE SINGLE FIBERS AT EXTREME TEMPERATURES AND STRAIN-RATES
… High Molar Mass Polyethylene (UHMMPE) single fibers was investigated at eleven temperatures from room temperature (20 °C) to the orthorhombic-hexagonal phase transition (148 °C) and at six strain-rates from quasi-static (10-3 s-1) to dynamic (103 s-1). Dimensional analysis of ballistic limit …
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Progressive Failure Analysis of Double-Notched Composite Laminates
Failure analysis in composite laminates is traditionally modeled by the material property degradation method for the in-plane damage prediction which assumes that a damage material can be replaced by an equivalent material with degraded properties. The delamination in composites, on the other hand, …
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Interfacial Mechanics in Fiber-Reinforced Composites: Mechanics of Single and Multiple Cracks in CMCs
… in the mechanics of the interface between the fibers and matrix in ceramic matrix composites (CMCs) are studied. The first issue is the competition between crack deflection and penetration at the fiber/matrix interface. When a matrix crack, the first fracture mode in a CMC, reaches the …
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Finite Element Analysis of Defects in Cord-Rubber Composites and Hyperelastic Materials
… approach based on the multiscale progressive failure analysis is employed to provide the theoretical predictions for damage development in the cord-rubber composites in tires. This new three-dimensional model of the cord-rubber composite is proposed to predict the different types of damage …
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Transverse vibration as a fouling limitation strategy in membrane bioreactors
… than the individual parameter. The impact of fiber arrangement and distance between fibers was also studied using a high concentration of yeast. It was found that during filtration with vibration, the performance of the system was not as sensitive to the close vicinity of the fibers, even at …
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Multi-axial failure of high-performance fiber during transverse impact
… regions so as to determine local or long range fiber failure being defined by shearing or fibrillation, respectively. Additionally, above said critical velocities, strikes with 18-mm flat discs and 18-mm round projectiles have been performed in efforts to ascertain the location of yarn failure …
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Failure Initiation and Progression in Internally Pressurized Non-Circular Composite Cylinders
In this study, a progressive failure analysis is used to investigate leakage in internally pressurized non-circular composite cylinders. This type of approach accounts for the localized loss of stiffness when material failure occurs at some location in a structure by degrading the local material …
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Analytical Modeling of the Mechanics of Nucleation and Growth of Cracks
… and those developed in this work. A progressive failure methodology is developed and demonstrated to simulate the initiation and material degradation of a laminated panel due to intralaminar and interlaminar failures. Initiation of intralaminar failure can be by a matrix-cracking mode, a …
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Structure and defects in high-performance aramid fibers
High performance aramid fibers, such as Kevlar, AuTx, and Twaron have been designed for ultra-high specific strength and stiffness. These fibers derive their superior properties from the high degree of molecular orientation that allows for efficient load transfer to the backbone covalent bond axis. …
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Exhaustible resources and technological change in the United States agriculture, 1940-1969
… to be met by a rapid rate of growth of food and fiber. Failure to achieve rapid growth in the agricultural sector would slow down the rate of growth of the whole economy, because agricultural industry would drain productive resources from other sectors of the economy and it would put pressure on …