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Showing 1 to 20 of 114 for “"Fatigue Damage"”.
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THERMAL FATIGUE DAMAGE OF ASPHALT PAVEMENT
Fatigue damage can be defined by a decrease in stiffness of Asphalt Concrete (AC) under repeated traffic loading. For each cycle of traffic loading, tensile strain develops at the bottom of AC layer of an asphalt pavement. Some localized damages occur in the material at minute-scale due to this …
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On Cumulative Fatigue Damage in Seismic Structures
Made available in DSpace on 2014-12-10T22:21:48Z (GMT). No. of bitstreams: 1 7212402.pdf: 7648637 bytes, checksum: 7e6ef70a149b116a898fd31df299fd6e (MD5) Previous issue date: 1971
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Fatigue damage in titanium graphite hybrid laminates
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Metallurgical Studies of Fatigue Damage in Maraging Steel
Made available in DSpace on 2014-12-10T17:57:49Z (GMT). No. of bitstreams: 1 6711866.pdf: 4658539 bytes, checksum: d77294e41db3c68c53917c8f926eca5c (MD5) Previous issue date: 1967
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ANALYTICAL FATIGUE DAMAGE CALCULATION FOR WIND TURBINE SUPPORT STRUCTURE
Fatigue plays an important, often crucial role in the design of wind turbine support structures due to the large number of wind-induced and operational stress cycles. Flexibility of the tower foundation is usually specified during the turbine design certification to achieve a natural frequency to …
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Fatigue Damage and Small Crack Growth During Biaxial Loading
The progressive nature of fatigue damage under biaxial loading has been investigated. Experiments were performed on thin-wall tubular specimens of 1045 steel in tension, torsion, and combined tension-torsion loading. Two equivalent strain amplitudes, one in the high cycle fatigue (HCF) region and …
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Drag amplification and fatigue damage in vortex-induced vibrations
Fatigue damage and drag force amplification due to Vortex-Induced-Vibrations (VIV) continue to cause significant problems in the design of structures which operate in ocean current environments. These problems are magnified by the uncertainty in VIV prediction, particularly with regard to fatigue …
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Mechanics of fatigue damage in titanium-graphite hybrid laminates
Titanium-graphite hybrid laminates are being developed for high-temperature aerospace applications. Experimental observations have indicated that cracks in the titanium facesheets initiate at free edges as well as in areas of high stress concentration, such as holes and notches and that a …
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Multiaxial fatigue damage model for random amplitude loading histories
In spite of many multiaxial fatigue life prediction methods proposed over decades of research, no universally accepted approach yet exists. A multiaxial fatigue damage model developed for approximately proportional random amplitude loading is proposed in this study. A normal strain based analysis …
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The inherent variation in fatigue damage resulting from random vibration
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1962.
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Tensile Fatigue Damage and Degradation of Random Short-Fiber Smc Composite
Fatigue damage and degradation in a random short-fiber SMC-R50 composite are investigated experimentally and theoretically. In the study of homogeneous damage, experiments were conducted to examine fundamental mechanisms and characteristics of fatigue damage and its evolution. The statistical …
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Fatigue Damage Analysis for Irregular-Shaped Structures Subjected to Representative Loads
Made available in DSpace on 2014-12-12T00:25:55Z (GMT). No. of bitstreams: 1 7414579.pdf: 4380606 bytes, checksum: eea213e9b7e2831d68ba6c4dd8d8ec87 (MD5) Previous issue date: 1974
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Machine learning-based non-destructive evaluation of fatigue damage in metals
Non-destructive evaluation (NDE) of fatigue damage in metals is crucial for ensuring high product performance and safety. In remanufacturing, NDE for the incoming recycled metal materials is also essential to maximize the benefits of utilizing such materials. However, critical challenges exist in …
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Fatigue Damage Analysis in Asphalt Concrete Mixtures Based Upon Dissipated Energy Concepts
… results of this study provide a foundation for fatigue analysis based on dissipated energy concepts. Using the dissipated energy concepts in fatigue analysis make it possible to account for damage in a straightforward manner. The energy fatigue relation is easy, simple and based on a theory it …
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Quantification of fatigue damage in AISI 316L stainless steel using X-Ray powder diffraction (XRD)
… capabilities in component life assessments. Fatigue damage is among the major issues in engineering, because it increases with the number of applied loading cycles in a cumulative manner and can lead to fracture and failure of the considered part. This study systematically investigates the …
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Fatigue damage mechanisms in fiber reinforced composite materials including the effect of cyclic loading frequency
… investigation seeking to characterize fatigue damage mechanisms in fiber reinforced composite materials, accounting for the effect of cyclic loading frequency, is presented. A many faceted approach to the investigation was utilized; which included well documented strain-controlled …
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An investigation of stiffness reduction as an indicator of fatigue damage in graphite epoxy composites
… using moduli reduction to monitor the effect of fatigue damage in graphite epoxy composites. Five laminate orientations were considered, [O]₄, [90]₄, [±45]<sub>s</sub>, [0,90]<sub>s</sub>, [0,90,±45]<sub>s</sub>, and four inplane-stiffness properties were monitored for each. The stiffness …
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Modeling of active crack damage control and the active fatigue damage control of adhesive joint
Active damage control is a new technique which mimics the self-repairing capability of biological beings and can be used to greatly increase the structural integrity and fatigue life. This thesis describes two approaches used in active damage control: direct stress cancellation and indirect stress …
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Effects of broad-banded higher harmonics on fatigue damage of risers due to vortex-induced vibrations
… which regions of chaotic response increase the damage on the riser had not previously been explored in detail. To facilitate the exploration, a method for separating the effects of the fundamental frequency, higher harmonics, and the chaotic content was developed and applied to four cases from …
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