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 18 of 18 for “"S-N curves"”.
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EFFECT OF WELD-TOE GRINDING ON FATIGUE LIFE BASED ON THEORY OF CRITICAL DISTANCE
… this study introduces two types of effective S-N curves to predict the fatigue behaviors of the three investigated welded joints based on the best-fit critical distance of 0.2 mm and 0.3 mm from statistical assessment.
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Avaliação de concentração de tensão em dutos danificados sob pressão interna após reparo
… of damaged pipes, from the correction of S-N curves.
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Machine learning-based non-destructive evaluation of fatigue damage in metals
… framework with hierarchical classifiers and S-N curves for identifying fatigue damage levels and inferring RUL is developed. In addition, regression models are developed to estimate residual stress and full width at half maximum (FWHM). The effectiveness of the proposed methods is demonstrated by …
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Computational Stress and Deformation Analysis of Mammary Prosthesis
… calculation using the Palmgren-Miner rule, S-N curves, and an external load spectra.
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The mechanical properties of tightly woven carbon-carbon composites
… levels versus number of fatigue cycles (S-N curves) are plotted to determine the effect of fatigue on these composites. Results of composite behavior are discussed in terms of the relationship of the stress-strain behavior to the fatigue life of these composites as well as the effects of …
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Development of a vibration fatigue failure prediction model for automotive lamps made of polymers
… from the existing models, fatigue data (S-N curves) and variability in the behaviour of manufactured constructions. Also, dynamic and fatigue models need to be established. A study was conducted to identify from the existing models, hyperelastic material model that can reliably describe the …
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Post-Injection Welded Joint Fatigue Tests of Sandwich Plate System Panels
… predictions were made using code based S-N curves, and a relatively new mesh-insensitive structural stress method with a master S-N curve approach. The post-injection welded joint demonstrated good fatigue resistance to recommended AASHTO loading when shims were used under the middle support …
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Fatigue response of fabric reinforced polymeric composites
… at various strain levels were compared (S-N curves) and the model was found to be conservative within 10% error.;Two lightweight Glass FRP composite modular bridge decks were evaluated for structural integrity and degradation in bending rigidity under repetitive simulated wheel load (HS20-44 …
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Quasi-Static and Fatigue Evaluation of Pultruded Vinyl Ester/E-Glass Composites
… reduction, and residual strength. Measured S-N curves and residual strength curves compared with literature were found most like woven fabric laminates, well below aerospace grade laminates. Residual strength and life analysis using Reifsnider's methodology [43], revealed that the choice of …
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Quasi-Static Tensile and Fatigue Behavior of Extrusion Additive Manufactured ULTEM 9085
… the procedure outlined in ASTM D7791. S-N curves were generated using data collected at stress levels of 80%, 60%, 30% and 20% of the ultimate tensile stress with an R-ratio of 0.1 for the build orientation XZY. The contour thickness and raster thickness were increased to 0.030 in. to …
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Floating production storage offloading unit structural fatigue analysis
… research includes a calibration method for S-N Curves required for typical fatigue sensitive details in FPSOs. It also provides improved information on the important link between S-N data and finite element analysis for fatigue life assessment using a linear cumulative damage formulation.
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Fatigue design of oil tankers: a design approach
… Miner's rule fatigue assessment based on the S-N curves of the British Welding Institute. The example calculations yield two important results. First, relatively inexpensive methods can yie1d important and accurate fatigue results; for a side shell longitudinal at the water line the example …
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Optimization of Rib-To-Deck Welds for Steel Orthotropic Bridge Decks
… for the fabrication and test error. Hot-spot S-N curves were established for each specimen series. Statistical analyses were performed to study in depth the effect of weld dimensions and test scenarios. Multiple linear regression (MLR) was performed to investigate the effects of different weld …
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The effect of drawing strain on the fatigue behaviour of stainless and carbon steel wires
… both notched and unnotched samples and the S-N curves were used to evaluate the fatigue properties of the steels. Tests were performed with sinusoidal loading and load ratios of R= 0.048 and R=0.22 at a frequency of 2Hz. The microstructural evolution during drawing was characterised by optical …
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Mechanical Properties and Durability of Natural Rubber Compounds and Composites
… The predicted stress versus cycles, S-N, curves were not in complete agreement with the experimental data. The error between the predicted and the experimental is discussed and future work to correct that error is suggested. While there was not complete agreement between the predicted and …
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HARMONIC AND RANDOM VIBRATION DURABILITY INVESTIGATION FOR SAC305 (Sn3.0Ag0.5Cu) SOLDER JOINT
… fatigue constants. Generalized strain-based S-N curves have been obtained for both SAC305 and Sn37Pb solder materials. The strain-life model constants show that SAC305 solder material has superior fatigue properties compared to Sn37Pb solder material under low-cycle fatigue loading, while the …
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Fretting Fatigue Characterization of Steel Bolted Connections
… life measurements, presented in the form of S-N curves, showed that, regardless of the surface finish type, increasing the bolt preload reduced the fretting fatigue life in most cases, with the reduction being most pronounced for specimens with a Class B surface finish. The fretting fatigue lives …
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Characterization and Modeling of Transformation Induced Fatigue of Shape Memory Alloy Actuators
The main focus of this research is the transformation induced fatigue behavior of shape memory alloy (SMA) actuators undergoing thermally induced martensitic phase transformation. The recent development of aerospace applications employing shape memory alloys (SMAs) has expanded the need for fatigue …