Global ETD Search
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 21 for “"bending fatigue"”.
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Bending fatigue and creep of tough matrix laminates
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Characterization of bending fatigue mini-specimens for nuclear materials
… to estimate its safe operating life. Studying fatigue of irradiated specimens is challenging due to space limitation in research reactors (e.g. ATR). The mini-specimen bending fatigue (Krouse-type) of nuclear materials was used to study fatigue properties and compare the obtained results with …
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Effect of imposed stress conditions on the bending fatigue performance of case carburized steels
Includes bibliographical references (pages 268-275).
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Effects of prestrain on bending fatigue performance of zinc coated interstitial free sheet steels, The
Includes bibliographical references (pages 108-111).
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The effect of surface treatment and rolling direction on the fatigue behavior of grade one commercially pure titanium
Fully-reversed bending fatigue tests were conducted on both the as-received and finished grade one commercially pure titanium. Finishing is done by a process developed by TiMesh Inc., and known as TiMesh finishing. Results show that TiMesh finishing can not only increase material fatigue life at …
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Fatigue Behavior Of Continuous Fiber-Reinforced Composite Beams
<p>A study has been taken to evaluate the fatigue behavior of glass fiber-reinforced composite beams. Due to their highly anisotropic 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 …
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The effect of hydrogen on the fatigue life of high strength steel
Torsional fatigue tests were conducted on 4370 steel oil quenched and tempered at 1000° F in (l) the uncharged state, (2) the hydrogen charged state, and (3) in a hydrogen environment. The tests were conducted on both smooth (K<sub>t</sub> = l.l) and V-notch (K<sub>t</sub> = 3.8) test specimens. A …
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Experimental Investigation Of Fatigue Behavior Of Carbon Fiber Composites Using Fully-Reversed Four-Point Bending Test
… ratio, and good moldability. Prediction of the fatigue life of composite laminates has been the subject of various studies due to the cyclic loading experienced in many applications. Both theoretical studies and experimental tests have been performed to estimate the endurance limit and fatigue …
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RESIDUAL STRESSES IN GROUND AND IN PEENED SURFACE
… the effect of grinding and of peening on fatigue strength , samples were subjected to rotating bending fatigue tests . These showed that the fatigue resistance of ground specimens and shot-peened ones improved at long life from that of hardened-only specimens by more than 10%.
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NEW GENERATION POLYMER CONCRETE INCORPORATING CARBON NANOTUBES
… and slant shear tests. Moreover, four-point bending fatigue test was performed to examine the fatigue strength of PC overlays under cyclic traffic loads. Finally, microstructural and thermal stability of epoxy incorporating MWCNTs was evaluated using Scanning Electron Microscope (SEM), …
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Energy Dissipation and Entropy Generation During the Fatigue Degradation: Application to Health Monitoring of Composites
… (G10/FR4) laminate subjected to fully reversed bending fatigue test is presented. Infrared thermography and acoustic emission are utilized to characterize the degradation progression. The results show similar evolutionary response indicating the presence of three degradation stages. The effect …
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Methods and devices for corrosion fatigue testing without acceleration
… class of vessels. On existing classes, corrosion fatigue limits this interval, but data on corrosion fatigue life is sparse and incomplete. An existing model from previous research has been updated and stands ready to provide predictions, given more relevant data. Techniques and devices are …
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Surface integrity evaluation and the effect of machining-induced surface integrity characteristics on part's performance
… transformation, strongly affect the fatigue and stress behavior of machined parts. This kind of influence is particularly sensitive and pronounced in the difficult-to-machine materials, which are typically chosen for the most critical applications in the automobile, aerospace and …
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EFFECTS OF LASER MACHINING ON STRUCTURE AND FATIGUE OF 316LVM BIOMEDICAL WIRES
… tension, and in cyclic strain-controlled fatigue with the use of a flex tester operated to provide fully reversed bending fatigue. All the fatigue testing was conducted in air over a range of cyclic strains to determine both the high-cycle and low-cycle fatigue regimes. The effects of …
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DEVELOPMENT OF FATIGUE MODELS FOR COPPER TRACES ON PRINTED WIRING ASSEMBLIES UNDER QUASI-STATIC CYCLIC MECHANICAL BENDING
This dissertation investigates the fatigue durability of copper (Cu) traces on printed wiring assemblies (PWAs) under quasi-static cyclic mechanical flexure, using experimental results from a set of three-point bending fatigue tests, finite element (FE) modeling of the stresses generated during the …
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High Cycle Fatigue Simulation using Extended Space-Time Finite Element Method Coupled with Continuum Damage Mechanics
High cycle fatigue (HCF) is a failure mechanism that dominates the design for many engineering components and structures. Surface treatments such as laser shock peening (LSP), ultrasonic nanocrystal surface modification (UNSM) and many others introduce significant residual stresses in the material, …
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Fatigue in low pressure carbonitrided steels
… 20MnCr5 + B, SAE 8620 and SAE 8620 + Nb. Bending fatigue tests were performed with Brugger specimens to simulate fatigue on the tooth root of a gear. The heat treatment parameters were modified to ensure the surface hardness and effective case depths were comparable for the four alloys. …
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Development of a vibration fatigue failure prediction model for automotive lamps made of polymers
… for numerically modelling and predicting the fatigue life of automotive lamps made of thermoplastic polymers. The primary aim is to use the fatigue failure prediction technique developed in this research to address fatigue challenges in the design of automotive lamps. The research combined …
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HIGH STRENGTH COLD ROLLED ASPHALT SURFACE COURSE MIXTURES
… traffic loads and providing good resistance to fatigue cracking. The mentioned new product is termed Cold Rolled Asphalt (CRA). The main aim of this study was to investigate producing high strength, fast curing and sustainable CRA mixtures for heavily trafficked road and highway surfacing layers …
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The effect of laser shock peening and shot peening on the fatigue performance of aluminium alloy 7075
It has been well established that most fatigue cracks initiate from stress concentration sites found on the surfaces of components subject to cyclic fatigue loading. The introduction of residual compressive stresses into the surface layers of components, through various means including shot peening …
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