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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 76 for “"Damage Accumulation"”.
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Damage accumulation in hybrid woven fabric composites.
Damage accumulation in glass fibre woven reinforced epoxy laminates manufactured from two different fabrics have been investigated under three different loading conditions. One of the woven fabrics was non-hybrid glass using E-glass fibre yams in both warp and weft (fill) directions, the second …
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Damage accumulation in high performance synthetic fibre ropes
… results of an investigation into the process of damage and failure in small diameter high performance synthetic fibre ropes namely Dyneema, Vectran and Technora ropes. This study was prompted by a series of fatal accidents on paragliders as a result of the line failure. All the different rope …
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Damage accumulation of bovine bone under chaotic loading.
… was able to successfully identify the various damage modes and may be a viable tool for predicting the fatigue life of bone. As such, PSW is worth further research. Many more tests need to be completed to obtain statistical significance.
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Damage accumulation of bovine bone under variable amplitude loads.
… by excessive fatigue in bone. This study into damage accumulation in bone sought to determine if the Palmgren-Miner rule (PMR), a well-known linear damage accumulation hypothesis, is predictive of fatigue failure in bone. An electromagnetic shaker apparatus was constructed to conduct cyclic and …
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Damage accumulation of bovine bone under chaotic and variable amplitude loading.
… type. PSW has shown it is able to identify damage modes of fatigue. Therefore, further investigation into the prediction capabilities of PSW should be pursued.
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Damage accumulation in a gradient stress field in graphite/epoxy laminates
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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Damage accumulation in graphite/epoxy laminates due to cyclic gradient stress fields
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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A study of the damage accumulation process in poly(aryl ether ketone ketone) and its AS4 carbon fiber reinforced composites
… presents the results of a study done on the damage accumulation process in poly(ether ketone ketone) and its AS4 carbon fiber reinforced composites. The damage accumulation process was studied as a function of applied heat treatment. This study is the result of a project funded by duPont and …
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Towards structural health monitoring in carbon nanotube reinforced composites
… common in industry, detecting mechanical damage and damage accumulation becomes increasingly difficult as many modes of failure occur below the external surface. Traditional SHM techniques may be time consuming and costly; however, CNTs are a unique material that shows promise as a strain …
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Bone Mass Preservation and Fracture Risk Assessment with Bisphosphonate Therapy During Spaceflight
… also lead to increased levels of fatigue microdamage. Fracture risk can be lowered by increasing both bone mass (quantity) and bone quality. The purpose of this study was to create a computer model to simulate bisphosphonate treatment on astronauts while traveling in space in order to examine …
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Fatigue crack growth in ceramics containing a viscous grain boundary phase at elevated temperatures
… on cyclic fatigue-crack growth behavior. A damage zone was observed ahead of the crack tip in which grain boundary cavitation (or microcracking) occurred during fatigue-crack growth. An analytical model based upon the damage accumulation in the grain boundary phase was developed that …
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Damage evaluation in dimension limestone using nonlinear ultrasonics
… limestone test samples with increasing levels of damage were obtained by exposing limestone samples to temperature levels of 100 oC, 200 oC, 300 oC, 500 oC, 600 oC, and 700 oC for a period of 90 minutes. The samples were then nondestructively tested using nonlinear ultrasonics in the form of a …
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ΑΞΙΟΛΟΓΗΣΗ ΤΟΥ ΟΡΙΟΥ ΖΩΗΣ ΣΕ ΚΟΠΩΣΗ ΑΕΡΟΠΟΡΙΚΩΝ ΣΥΝΘΕΤΩΝ ΥΛΙΚΩΝ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΗΣ ΑΚΟΥΣΤΙΚΗΣ ΕΚΠΟΜΠΗΣ
… HAS BEEN REPLACED BY ANOTHER DESIGN CONCEPT "DAMAGE TOLERANCE". WITHIN THE OVERALL CONCEPT OF "DAMAGE TOLERANT" PRODUCTS "NDE" AND ACOUSTIC EMISSION METHOD PLAY SIGNIFICANT ROLES TO THE DEVELOPMENT OF TECHNIQUES FOR ASSESSING DAMAGE ACCUMULATION AND MONITORING DIFFERENT FAILURE MODES. SEVERAL …
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GENERATION, MECHANICAL AND STATISTICAL ANALYSIS, AND FEM SIMULATION OF FRACTURE OF REPEATABLE RANDOM ROUGH SURFACES
… service surface conditions through surface damage accumulation. Statistical moments and other parameters were correlated with fracture locations probability (H/N), versus auto correlation length, and depth. As the surface grows to a full Gaussian, H/N increases its dependence on profile’s …
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The dynamic stability characteristics of damage-prone systems
… and inelastic material response with damage, is presented. Because the differential equations that describe the motion are highly nonlinear and coupled for the multi-degree-of-freedom system, a numerical procedure was employed to determine the response. While most engineering …
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Performance of laminated veneer wood plates in decking systems
… type of product through small specimen tests and damage accumulation laws. A structural analysis model has been developed to predict the structural behavior of a prototype decking system. A comprehensive database on the mechanical properties of 3.2 and 2.5 mm (gl and i6 inch) thick Douglas-fir …
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Modeling Behaviour of Damaged Turbine Blades for Engine Health Diagnostics and Prognostics
… gas turbine engines is largely due to careful damage tolerant design a method of structural design based on the assumption that flaws (cracks) exist in any structure and will continue to grow with usage. With proper monitoring, largely in the form of periodic inspections at conservative …
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Ductile fracture modeling : theory, experimental investigation and numerical verification
… process along the plastic loading path. A new damage plasticity model for ductile fracture is proposed. Experimental results show that fracture initiation in uncracked ductile solids is sensitive to the hydrostatic pressure and is dependent on the Lode angle. The damage plasticity model is …
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Genomic Instability and the Oncohistone H3K27M Drive Gliomagenesis in a Murine Model
… surveillance during DNA replication and DNA damage repair in differentiating and mature cells. Neural cells are particularly sensitive to DNA strand breaks and defective DNA damage responses can result in detrimental effects on the nervous system, including cancer. Multiple DNA repair …
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Mechanisms of DNA double strand break-mediated neurotoxicity in neurodegenerative disease
Neurons are highly susceptible to DNA damage accumulation due to their large energy requirements, elevated transcriptional activity and long lifespan. DNA double strand breaks (DSBs) are also linked to neurodegeneration and senescence. However, it is not clear how DSB-bearing neurons influence …
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