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 27 for “"loading history"”.
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Effect of loading history in necking and fracture
… of forming severity is introduced to study the loading history effect on metal forming limit diagram (FLD). Given the necking locus under proportional loading conditions, and using a non-linear accumulation rule of forming severity index, the proposed model well predicts the FLDs under different …
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Bone mineral density patterns representing the loading history of the wrist joint
Item does not contain fulltext
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Further Development of the Total Fatigue Life Model for Weldments and Its Application to Fatigue Design
… were fatigue tested under SAE Bracket variable loading history. Tube-to-plate welds were fatigue tested under bending and torsion loading conditions. Fatigue test results were compared with predictions made using the total fatigue life model which predicts the total fatigue life of weldments by …
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Multiaxial fatigue damage model for random amplitude loading histories
… for approximately proportional random amplitude loading is proposed in this study. A normal strain based analysis incorporating the multiaxial state of stress is conducted along a critical orientation assuming a constant strain ratio. The dominant deformation direction is chosen to be the …
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Evaluation of Extended End-Plate Moment Connections Under Seismic Loading
… end-plate moment connections subjected to cyclic loading. Seven specimens representing three end-plate moment connection configurations commonly used in the pre-engineered building industry were used. The connections were designed using yield-line theory to predict end-plate yielding and the …
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NFEA Modeling of RC Beams Having Exposed Longitudinal Reinforcement: Effects of Debonding on Shear Behavior
… the depth of the cross section over the entire loading history. Validation of this method is made against experimental test data of shear critical reinforced concrete beams both with and without shear reinforcement.
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Mode I Delamination Fracture Characterization of Polymeric Composites under Elevated Temperature
… temperature when PMC properties become time-, loading-history, and rate-dependent. A new experimental methodology based on linear viscoelastic fracture theory is developed and verified through finite element analysis and experiments. This new technique determines crack growth curves, such as …
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In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys
… (ISVs) like volume fraction under biaxial loading conditions.The first part of the thesis examines the role of loading history on reorientation mechanics of martensitic NiTi. Deformation under mechanical loads of two sets of specimens with different initial microstructure were compared. …
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Thermo-mechanical behavior of steel in the continuous casting process from meniscus to caster exit
… cooling, bending and unbending on the mechanical loading history of the strand. The thermal behavior of the model is calculated using boundary conditions from CON1D, in the mold and in secondary cooling. The thermal boundary conditions in secondary cooling consider the heat extraction of roll …
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Life Prediction of Composite Armor in an Unbonded Flexible Pipe
… at varying temperatures, aging times and loadings. An analytic technique was developed to predict tensile rupture behavior from bend-compression rupture data. In comparison to tensile rupture tests, bend-compression rupture data collection are uncomplicated and efficient; thus, this …
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Tissue-specific behavioural signatures in cortical and trabecular bone. Variations in long bone structure in medieval Britain, and the differential effects of age.
… tissues have been shown to adapt to mechanical loading, anthropologists have interpreted the morphology of either cortical or trabecular bone as a record of loading history. As such, differences in mechanically relevant parameters between populations or species have been considered to present a …
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Biomechanical Responses of Human Surrogates under Various Frontal Loading Conditions with an Emphasis on Thoracic Response and Injury Tolerance
… of human surrogates under various frontal loading conditions. This objective was divided into three sub-objectives: 1) to evaluate the biofidelity of the current frontal impact ATDs, 2) to evaluate the effect of different safety restraints on occupant responses, and 3) to evaluate rib …
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High-cycle fatigue / low-cycle fatigue interactions in Ti-6Al-4V
… fatigue (HCF) and lowcycle fatigue (LCF) loadings are widely recognized as unavoidable during operation of these components and because the classic Linear Damage Rule (LDR) neglects to account for the synergistic interaction between these damage contributors, dangerous over predictions of …
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Tidally Forced Marine Ice Stream Instabilities and Their Consequences
… me to present both an updated model of ice loading history and an explanation for all major climatic events of the last 20,000 years in which the resumption of the AMOC after Heinrich event 1 leads to the B{\o}lling-Aller{\o}d warming, which results in increased melt of the Laurentide and …
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A system for high strain rate interruptible tensile tests
… recoverable after having undergone a single loading event. For this reason, microstructural investigations on SHPB specimens offer limited value, as the specimen was loaded repeatedly. In the MSc, a tensile SHPB (TSHB) was designed with momentum trapping to conduct interruptible tests on …
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Experimental and computational study of soot formation under diesel engine conditions
… The primary data set consisted of soot volume loading history for selected fuels at various equivalence ratios, temperatures and pressures. Based on existing sub-models, a detailed chemical kinetic calculation leading to soot particles was per- formed to study the relative importance of the …
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Experimental and analytical investigation of localization and post-peak behavior of steel members in tension
… length and its evolution throughout the loading history to study the effect of the length scale on the post-peak response of steel members. Second, linear, bilinear, and nonlinear post-peak localization models are developed and compared to experimental data. Third, a system of three steel …
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Damage accumulation in high performance synthetic fibre ropes
… have been tensile tested. The transfer of loading and subsequent damage in different rope constituents, fibres and strands, are also discussed. The residual strength of the rope after static and cyclic preloading regimes is discussed and possible mechanisms for the damage accumulation in …
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A COMPUTATIONAL APPROACH TO FRETTING WEAR PREDICTION IN TOTAL HIP REPLACEMENTS
… coefficient used and knowledge of the device loading history. The numerical method presented could be used to consider the effect of design changes and clinical technique on subsequent fretting wear in modular prosthetic devices or other mechanically coupled designs.
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Performance of Full-Scale Reinforced Concrete Columns Subjected to Extreme Earthquake Loading
… the program was to investigate the influence of loading history, thus the column specimens were subjected to several large displacement loading protocols, including monotonic and uniaxial and biaxial cyclic loading protocols. The last overall goal of the program was to investigate the post-peak …
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