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.
Results
Showing 1 to 20 of 22 for “"force-deflection"”.
-
A laboratory simulation of low velocity projectile impact on thin plates
… in order that the penetration resistance force history and impact velocity can be measured by a data acquisition system for further analysis. A software package, developed specifically for the apparatus, manipulates the acquired load-time trace and generates the necessary force and …
-
The linear elastic biaxial response of plain-woven meshes
… under biaxial tension and bending. In-plane force-deflection relations are derived through examining a representative element of the mesh. The analysis includes the contributions of tension, bending, and transverse shear to the complementary energy.
-
Nonlinear Dynamics and Vibration of Gear and Bearing Systems using A Finite Element/Contact Mechanics Model and A Hybrid Analytical-Computational Model
… parameter model, while the crucial dynamic mesh force is calculated using a force-deflection function that is generated from a series of static finite element analyses before the dynamic calculations. Incomplete tooth contact and partial contact loss are captured by the static finite element …
-
Large 3-D Deflection and Force Analysis of Lateral Torsional Buckled Beams
This thesis presents research on the force and deflection behavior of beams with rectangular cross-sections undergoing lateral torsional buckling. The large 3-D deflection path of buckling beam tips was closely approximated by circular arcs in two planes. A new chain algorithm element was created …
-
Compliant Centrifugal Clutches: Design, Analysis, and Testing
… model (PRBM), rigid-body replacement synthesis, force-deflection analysis, compliance potential evaluation, and compliant concept evaluation were used to develop effective new centrifugal clutch concepts. These methods helped develop and model four novel compliant centrifugal clutch designs, …
-
Large-Displacement Linear-Motion Compliant Mechanisms
… displacement, off-axis stiffness, actuation force, and size. Displacement is normalized by the footprint of the device. Transverse stiffness is normalized by a new performance characteristic called virtual axial stiffness. Torsional stiffness is normalized by a performance characteristic …
-
Hair Bundle Stiffness in the Turtle Utricle: Structural and Regional Variations
… using a glass supporting probe. Through both force deflection and a high speed video technique, measured values of EI ranged from 1460 – 6150 pN·µm2. The rotational stiffness of the kinocilium about its apical insertion was also measured. Bundles were treated with BAPTA to break the kinocilial …
-
Characterizing hydrogel imposed strain fields on brain tissue phantom for use in neural implant device coatings in presence of micromotion
… were calculated via Hertzian analysis of force-deflection curves produced using an AFM tip as a nanoindenter. The moduli of the samples did not change significantly with change in macromer Mw, but did change with solution concentration. 20% gels had moduli of 120-180 kPa and 5-10% gels had …
-
The design and performance of a low-cost inflatable wheelchair seat cushion
… damping, loaded contour depth, envelopment, 10% force deflection, horizontal stiffness, and sliding resistance. An additional test was conducted to evaluate the cushion's pressure distribution in tilted conditions. The results of the above mentioned tests were compared with published data of …
-
Analysis of bow crushing in ship collision
… The solution includes determination of the force-indentation relationship, a number of folds and a total amount of damage for a given speed of a ship. Five scale model tests were run and the force-deflection characteristics were recorded. A good correlation was obtained between the …
-
Design of an endoscopic biopsy needle with flexural members
… tissue when the needle is withdrawn. Using force-deflection and sample weight data from 10x scaled prototypes, variations of a flexural design captured 1.1 grams of a tissue phantom on average, as compared to wedge-type designs that averaged of 0.7-0.8 grams. Peak entrance forces for the …
-
Contact resistance in RFID chip-antenna interfaces
The purpose of this study was to determine a force-deflection relationship and a force-contact area relationship between a flat planar solid and a spherical solid in terms of material and surface properties of the two bodies. This relationship was determined and it was discovered that the force was …
-
Fundamental Components for Lamina Emergent Mechanisms
… and the equations necessary for determining the force-deflection characteristics and stress are presented. Since the LET Joint can be fabricated from a single planar layer, it is well suited for macro and micro applications. Illustrative examples of the LET Joint are provided with devices …
-
Compliant Mechanism Suspensions
… Controlling wheel motion in response to control forces has also been shown to be an important functional requirement for a compliant suspension system. Vehicle applications that are best suited for the use of compliant suspension systems are those that are low weight, have low energy storage …
-
Fabrication and material characterization of silver cantilevers via direct surface micromachining
… were mechanically characterized by using force-deflection measurements made by a P-10 contact profilometer or a Hysitron nanoindentor. We present findings of 21.9±1.50GPa or 22±1.5GPa for the silver ink's Young's modulus of elasticity, depending on the characterization method. These …
-
Polyurethane foams containing renewable castor oil replacement
… mold" method was applied. Density, compression force deflection (CFD), 50% constant deflection compression (CDC), tear resistance (TR) and resilience were tested to identify the physical properties of flexible polyurethane foams. Results show that castor oil replacement often leads to a high …
-
Nonlinear finite element modeling and incremental analysis of a composite truck tire structure
… is validated through a comparison of the normal force-deflection characteristics and the contact patch geometry derived from the model with the laboratory-measured data in a qualitative sense. The tire model is used to conduct a parametric study on the shear interactions in the multiple layers …
-
Probabilistic Analysis of the Material and Shape Properties for Human Liver
… found after cooling or freezing storage. The force-deflection responses of THUMS model with probabilistic liver material models were within the test corridors obtained from cadaveric tests. Significant differences were observed in the maximum and minimum principal Green-Lagrangian strain …
-
Study of driver-seat interactions and enhancement of vehicular ride vibration environment
… through measurement and analysis of contact force and area. The results are utilized to propose a nonlinear and asymmetric seat cushion model. A nonlinear suspension seat model is further developed to incorporate asymmetric force-velocity and nonlinear force-deflection characteristics of the …
-
Nonlinear Dynamics in Metamaterials under Elastic and Plastic Excitation and Spectral Submanifold Parameterization
… verification, a discrete metamaterial with force-deflection behavior analogous to hysteretical plasticity using experimental Jenkin's elements. The subsequent testing of this discrete metamaterial confirms the persistence of the elastic metamaterial bandgap under plastic amplitude …
Page 1 of 2