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Showing 1 to 16 of 16 for “"Compressive Failure"”.
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The compressive failure of graphite/epoxy plates with circular holes
… of an experimental investigation into the compressive behavior of T300-5208 graphite/epoxy plates measuring 12.70 cm by 25.40 cm and containing circular cutouts ranging to 3.81 cm are reported. Two thicknesses, 24 ply and 48 ply were chosen to differentiate between stability failures due to …
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Uncertainty in marine structural strength with application to compressive failure of longitudinally stiffened panels
… random uncertainty is presented for structural failure modes with a well defined limit state. A methodology is also presented for determining the relative importance of the basic strength parameters in terms of their importance to the total random uncertainty. These methodologies are applied to …
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Compressive failure of notched angle-ply composite laminates: three-dimensional finite element analysis and experiment
… circular holes were tested under uniaxial compressive loading. The results from these tests show that the [(±45)₁₂]<sub>s</sub> laminate exhibited plastic deformation, with ultimate applied strains exceeding -1%. All other laminates failed in a brittle manner with ultimate strains of less …
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Investigation of unstable failure in underground coal mining using the discrete element method
Unstable failure in underground coal mining is the sudden and violent ejection of coal from mine walls and pillars into the mine opening. This thesis demonstrates the use of the discrete element method to simulate stable and unstable modes of compressive failure of a western U.S. coal. Two discrete …
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Fatigue Behavior Of Continuous Fiber-Reinforced Composite Beams
… properties, composite beams have different failure modes at different stages of fatigue life. The results of the four-point bending fatigue tests show that the material follows different failure mechanisms depending on the stress level applied to the beam and failure mode changes from …
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Using finite element models under multiple loading conditions to improve the association between radius and tibia microarchitecture and prevalent osteoporotic vertebral fracture
… controls. As fracture is a result of mechanical failure, FE models of these sites in physiologically relevant loading conditions (compression, torsion, bending) may reveal insight into fracture pathogenesis uncaptured by microarchitecture. In this study, HR-pQCT scans at the tibia and radius were …
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Failure strength and mechanism of composite laminates under multiaxial loading conditions
An experimental study of strength and failure behavior of orthotropic G-10 glass fiber reinforced composite laminates in an in-plane stress state has been conducted. Different types of biaxial specimens and associated test fixtures were developed and employed in the study. Standard IITRI specimens …
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Compressive strength and behavior of 8H C3000/PMR15 woven composite material
… volume fraction were tested under quasi-static compressive load to failure at room temperature. Micrographic evidence clearly identifies the mode of compressive failure as fiber kinking. Each fiber in the kink fractures because of a combination of compressive and shear stresses. A post failure …
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Indentation testing of composite materials: a novel approach to measuring interfacial characteristics and engineering properties
… model of the contact situation predicted failure events and trends consistent with the observed data from the CBIT. The present elastic model predicted an interfacial shear strength slightly higher than those reported in the literature. However, the interface strength obtained through the …
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Stress rupture of unidirectional polymer matrix composites in bending at elevated temperatures
… if the end-to-end distance is known. The failure process has been experimentally characterized. The formation and propagation of microbuckles leads to a compressive failure. Based on the elastica and the classical lamination theory, a model for the distribution of the Young's modulus along …
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Predicting Compression Failure of Fiber-reinforced Polymer Laminates during Fire
… model was developed to predict the failure of compressively loaded fiber-reinforced polymer (FRP) laminates during fire. The thermal model was developed as a one-dimensional heat and mass transfer model to predict the thermal response of a decomposing material. The thermal properties …
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Thermo-Mechanical Behavior of Polymer Composites Exposed to Fire
… to predict the thermo-mechanical behavior and compressive failure of polymer matrix composites (PMCs) subjected to heat and compressive load. An overlaid element technique is proposed for incorporating the model into commercial finite element software ABAQUS. The technique is employed with the …
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Failure analysis of a quasi-isotropic laminated composite plate with a hole in compression
The ability to predict failure of laminated composites in compression has been doggedly pursued by researchers for many years. Most have, to a limited extent, been able to predict failure for a narrow range of laminates. No means, as yet, exist for predicting the strength of generic laminates under …
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Analysis of the forces on the spine during a fall with applications towards predicting vertebral fracture risk
… These forces can be compared to a mean compressive failure force around 2000 N in elderly thoracolumbar vertebrae. This puts a portion of the elderly population at risk for a fracture simply from an upright passive fall of average velocity. The highest forces were found in upright, fast …
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Identification of the Mechanism of Oxide Scale Fracture, and its Correlation with Strain Using Acoustic Emission.
… test technique has been developed to measure the failure strains and to study the failure mechanisms of brittle layers in tension and compression. Tests were made with iron oxide and nickel oxide at room temperature and 550 or 900 °C, respectively, using strain rates of 10~* and 10"5 s"1 . Brittle …