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 39 for “"strain energy density"”.
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Strain Energy Density and Thermodynamic Entropy as Prognostic Measures of Crack Initiation in Aluminum
… dissertation explores the cumulative plastic strain energy density and thermodynamic entropy generation up to crack initiation. Plastic strain energy density and thermodynamic entropy generation are evaluated to investigate whether they would be capable of providing a physical basis for …
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Αστοχία ρηγματομένων όλκιμων πλακών με δύο συμμετρικές εγκοπές
… to the plane of the crack. Based on the strain energy density criterion the critical stress for crack growth initiation is determined. The influence of body geometry as it is dictated by notch radius, crack length and distance between crack and notches on the critical stress is studied …
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Bench blast modeling: Consequences of crushed zone, wave front shape, and radial cracks.
… cracks. Displacement fields, stress fields, and strain energy density distribution are studied. The analyses show that including radial cracks increases the levels of the strain energy density contours and the magnitudes of the displacement and stress fields several fold. The equivalent cavity …
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Constitutive modeling of the finite deformation behavior of membranes possessing a triangulated networked microstructure
… example, a constitutive model of the stress-strain behavior of the red blood cell membrane is developed. The mechanical behavior of the membrane of the red blood cell is governed by two primary microstructural features: the lipid bilayer and the underlying spectrin network. The lipid bilayer …
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Mathematical modelling of growth factor induced cell migration in 3D engineered matrices
… substrate, resulting in spatially varying strain energy density gradients. The magnitude and direction of strain energy density gradients define cell migration. Cell-substrate adhesion and partial random motion are included. Further, the Green function and Duhamel principle are used to …
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Finite element models for predicting crack growth characteristics in composite materials
… with the Tsai-Wu failure criterion and the Sih strain energy density criterion as well as with experimental results. It is shown that the modified versions of point stress and Hashin criteria compare well with experiment.
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Fatigue stiffness loss and life prediction technique development of a real rubber automotive component by means of Finite Element Analysis
… deformation behaviours, knowledge of stress/strain histories, the fatigue life and failure plane associated with the nucleation of cracks and their subsequent growth, fatigue damage quantification parameters, cycling control type, influence of density and size of cracks. Material …
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Material Properties of Human Rib Cortical Bone from Dynamic Tension Coupon Testing
… with a custom slack adaptor, to provide constant strain rates, was used to apply tension loads to failure at an average rate of 0.5 strains/sec. The elastic modulus, yield stress, yield strain, ultimate stress, ultimate strain, and strain energy density were determined from the resulting stress …
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Numerical modeling of cortical bone adaptation due to mechanical loading using the finite element method
… nodes are displaced according to the local strain energy density as the growth stimulus. Using this stimulus, we show that the model can simulate the e ffect of the magnitude of applied loading on the growth response. We calibrate the growth law parameters by comparing the results from our …
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Investigation of bone response to implant materials by electron microscopy and computer simulation
… study the remodeling of trabecular bone. Using strain energy density (SED) as the optimization object and the trabecular width as the optimization variable, an optimal structure with minimum SED was achieved. This structure is similar to real bone in the dense outside, porous inside, and …
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Prediction of crack extension direction in unidirectional composites
… Stress Ratio, the Tensor Polynomial and the Strain Energy Density Criterion, were applied to predict the direction of crack extension. The theoretically predicted crack extension directions were then compared with experimental results. After comparison, it was determined that only the Normal …
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ΕΛΕΓΧΟΜΕΝΗ ΔΙΑΔΟΣΗ ΡΩΓΜΩΝ ΛΟΓΩ ΚΟΠΩΣΗΣ ΣΕ ΣΥΝΘΗΚΕΣ ΣΥΝΤΟΝΙΣΜΟΥ
… IS RELATED TO THE STRESS INTENSITY FACTOR OR THE STRAIN ENERGY DENSITY FACTOR DEPENDING ON THE KIND OF THE APPLIED LOADING. FOR THIS PURPOSE, THE WELL KNOWN EQUATIONS OF PARIS AND SIH ARE USED. THE DEPTH OF THE CRACK DETERMINES THE LOCAL STIFFNESS INTRODUCED BY THE CRACK, WHICH IN TURN INFLUENCES …
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Equine proximal phalanx bone properties during growth
… during quiet standing. Changes in mineral density and bone area fraction in the distal, diaphysis, and proximal regions were evaluated. The diaphysis of the P1 maintained constant strain energy density (SED) during growth, indicating adaptation to the standing condition. The proximal region …
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ΣΥΜΒΟΛΗ ΣΤΗΝ ΕΞΕΤΑΣΗ ΤΗΣ ΔΙΑΔΟΣΗΣ ΤΩΝ ΕΠΙΠΕΔΩΝ ΡΩΓΜΩΝ ΣΤΟΝ ΤΡΙΣΔΙΑΣΤΑΤΟ ΓΡΑΜΜΙΚΑ ΕΛΑΣΤΙΚΟ ΧΩΡΟ. ΟΙ ΦΑΣΕΙΣ ΤΗΣ ΕΝΑΡΞΗΣ ΤΗΣ ΔΙΑΔΟΣΗΣ ΚΑΙ ΤΗ...
… OF CALCULATION THE CRITERION OF THE MINIMUM STRAIN ENERGY DENSITY (MSED) WAS MAINLY USED, WHICH IS INDICATED FOR THE EXAMINATION OF THE INITIATION OF THE PROPAGATION AND OF THE STABLE AND UNSTABLE PROPAGATION OF THE CRACK. THIS CRITERION WAS CHECKED WITH REFERENCE TO ITS VALIDITY IN …
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Numerical analysis of elastic membrane structures subjected to hydrostatic pressure loading
… is accounted for by employing a Relaxed Strain Energy Density. The numerical procedure is based on the Dynamic Relaxation Method. This is an explicit, iterative technique in which the static solution is obtained as the steady state part of the damped dynamic response of the structure. The …
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Waves on Elastic Rods and Helical Spring Problems
… a nonlinear constitutive relation, where the strain-energy density contains a quartic term. Next, the effect of heterogeneity in the material properties on the shape of the loop is examined using a homogenization method. The second set of problems deals with a system consisting of a helical …
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Structural Design and Optimization of 65nm Cu/low-k Flipchip Package
… value of 2.9. A parametric study using 2D plane strain finite element analysis was performed to study the effect of various parameters on the reliability of the large die package in order to arrive at an optimized design. In order to have a simple criteria to predict the reliability of the …
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A micromechanics-based method for off-axis strength prediction of unidirectional laminae - Approach for a nonlinear rubber based lamina
… of the two models compared. The stresses and strains from the concentric cylinder model are averaged over the volume of the matrix and used in a local failure function. This failure function has the form of a reduced and normalized strain energy density function where only transverse and shear …
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Biomechanical Responses of Human Surrogates under Various Frontal Loading Conditions with an Emphasis on Thoracic Response and Injury Tolerance
… and fatalities resulting from MVCs, new safety restraint technologies and more biofidelic anthropomorphic test devices (ATDs) have been developed. However, the biofidelity of these new ATDs must be evaluated, and the mechanisms of injury must be understood in order to accurately predict injury. …
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Designing against failures resulting from static and time-varying loading in thick-walled components made of ductile cast iron
… such as automotive manufacturing, construction, energy production, and wastewater systems, DCI is exploited to produce complex and large components. Despite its advantages, the production of thick-walled DCI components faces significant challenges, including variability in mechanical properties …
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