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 23 for “"cyclic compression"”.
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Behavior of concrete under biaxial cyclic compression
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1982.
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Damage tolerance of composite honeycomb sandwich panels under quasi-static bending and cyclic compression
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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Fatigue Damage Prognosis of Internal Delamination in Composite Plates Under Cyclic Compression Loadings Using Affine Arithmetic as Uncertainty Propagation Tool
… life prognosis of composite plants subjected to cyclic compressive loadings. When loadings are compressive in nature, the composite plates undergo repeated buckling-unloading of the delaminated layer which induces mixed modes I and II states of stress at the tip of the delamination in the plates. …
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Neural network-based material modeling
… in biaxial stress states and in uniaxial cyclic compression. A composite material model simulating the stress-strain behavior of reinforced concrete as a generic composite material in a biaxial stress state is built with experimental data from Vecchio and Collins' tests on reinforced …
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Compression testing and measurement of material properties of a double network hydrogel
… Samples were tested under compressive loads in cyclic compression tests and stress relaxation tests. A viscoelastic model was applied and material properties were calculated using the experimental data. The elastic modulus of these PAAm-alginate gels was found to be 35kPa, while the viscosity, …
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Scalable Subcellular Resolution Mapping of the Human Brain
… finer structures. Through repeated thinning via cyclic compression dynamic loading, these tough tissues can be stained significantly faster and more uniformly than passive staining of typically preserved samples. Furthermore, their toughness allows them to be de-stained and re-stained many times …
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Piezoresistive UHMWPE WMCNT Sensors for Instrumented Total Knee Replacements
… the applied stress. A steel mold and a two-stage compression molding process were developed to instrument and hermetically seal the embedded sensors within the tibial insert. As the sensors were made from the same material as the UHMWPE tibial insert, the impact of the sensor instrumentation on …
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Some Investigations Of Phase Transitions In Rod-Like Macro-Molecules And Fibrous Gels
… We also show rate dependence of hysteresis in cyclic loading of the bar arising from the stick-slip kinetics. we also extract equilibrium and non-equilibrium information from an over-damped Langevin system using fluctuation theorems. Second, we use a double-well stored energy function in a …
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MULTIFUNCTIONAL BEHAVIORS OF TWO-DIMENSIONAL MATERIALS AND THEIR COMPOSITES
… large residual deformations were observed under cyclic compression of MXene microparticles. At last, a wireless, flexible on-mask immunosensing-based COVID-19 breath sensor was developed to detect air-borne viruses"--Abstract, p. iii</p>
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Design and Additive Manufacturing of Carbon-Fiber Reinforced Polymer Microlattice with High Stiffness and High Damping
… dynamic material analysis (DMA) and quasi-static cyclic compression tests respectively. It is seen that both intrinsic (small-strain) and structural (large-strain) damping in terms of a figure of merit (FOM), E1/3tanδ/ρ, can be enhanced by a small addition of a high loss phase in Reuss …
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Numerical Study of Nutrient Mixing in Trabecular Bone in Microgravity, Disuse and Normogravity
… using a soft-cap oscillation model that mimics cyclic compression. Three idealized trabecular morphologies are simulated across different frequencies to represent microgravity or disuse, walking, and running conditions. Scalar concentration decay is quantified using the spatial root-mean-square …
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Cold In-Place Recycling with Expanded Asphalt Mix (CIREAM)
… foam stabilizers, polymers and fibers. Uniaxial cyclic compression with partial confinement was used to assess effect of additives on deformation resistance of recycled mixes. Although a siloxane-based stabilizer significantly improved the stability of RAF foam, the binder may not be suitable for …
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Development of a Multi-Body Nonlinear Model for a Seat-Occupant System
… to estimate the model parameters using uniaxial cyclic compression data from experiments conducted at different rates on two types of low density polyurethane foams and three types of high density CONFOR foams. The performance of the proposed model was compared to that of other traditional …
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Spark Breakdown Voltage Sampling During Early Stage Compression
… conditions in the engine which cause significant cyclic variations of scavenging and trapping efficiencies. Existing combustion control methods are unable to accurately compensate for these conditions because fuel quantity is determined using the results of previous combustion events which do not …
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T cell Immunomodulation in the Lymph Node for Inhibition of Load-Induced Osteoarthritis
… increased in the lymph nodes with prolonged cyclic tibial compression. Both pro- and anti-inflammatory cytokines increased with damaging joint loading. Next, we determined the role of T cell presence and migration in OA progression using TCRα-/- and Sphingosine-1-phosphate (S1P) receptor …
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Dynamic Properties of Chondrocytes
… methods to study the effects of dynamic cyclic compression loading on chondrocyte volume and shape changes, not only at the beginning and end of the loading cycle but, crucially, throughout the loading process. These dynamic responses are then compared with those observed under static …
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Design and Installation of Ultra-High Performance Fiber Reinforced Precast Jackets for Retrofitting Concrete Piers
… Several columns were tested under monotonic and cyclic loading, after assembling the precast jackets designed and fabricated for the needs of the study. Parameters of investigation included two jacket thicknesses (i.e. 25 mm and 37.5 mm), the type of connectors between precast components, the …
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Design and Performance of Intrinsic Self-sensing Cementitious Composites for Smart Structural Health Monitoring of Civil Infrastructure
… scenarios was comprehensively assessed by cyclic compression, notched bending and splitting tension. The results indicate that the improvement of PP fibres on conductivity and self-sensing performance is heavily dependent on the coating efficiency of CB nanoparticles on the surface of PP …
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Modeling cell proliferation in a perfusion tissue engineering bioreactor
… 2D mathematical model for tissue growth within a cyclically-loaded tissue engineering scaffold is then analyzed. Such cyclic loading has the potential to improve yield and functionality of tissue such as bone and cartilage when grown on a scaffold within a perfusion bioreactor. The cyclic …
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Reversibility, memory formation and collective rotations in dense granular media
… the dynamics of individual grain subject to cyclic compression.The first study uses numerical simulations to connect granular rotations to translations in sheared granular packings. It is proposed that rotations play an extensive role in the formation of shear zones in granular packing, in …
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