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Showing 1 to 20 of 34 for “"material stiffness"”.
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Manufacture of Complex Geometry Component for Advanced Material Stiffness
… to produce a model that accurately predicts part stiffness. This is validated with experimental results of composite parts, which refine material properties for use in a final prototype part model. The secondary goal of this project is to explore manufacturing methods for improved …
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The Effect of Temperature on the Material Stiffness of Field Hockey Balls for Material Selection
It is well known that temperature affects the material properties of polyvinyl chloride (PVC). In particular, field hockey players report balls made of PVC breaking in half when hit in cold weather. Hockey ball manufacturers are interested in the effect of temperature on balls breaking to inform …
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Effects of substrate stiffness on bacterial biofilm formation
… to be influenced by many properties of substrate materials, such as surface chemistry, hydrophobicity, roughness, topography, and charge. However, few studies have been conducted to investigate the effects of substrate stiffness. In this study, Escherichia coli RP437 and Pseudomonas aeruginosa …
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Geometric and material nonlinear effects in elastic-plastic and failure analyses of anisotropic laminated structures
… element that includes linear elastic and plastic material behavior with full geometric nonlinearity is used to determine stresses at selected points (Gauss quadrature points in each element) of the structure. Material stiffness (constitutive) matrices are evaluated at each Gauss point, in each …
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Investigation of Parameters Influencing Reverse Fault Rupture Propagation to the Ground Surface
… have demonstrated that variation in near surface material stiffness may significantly affect the probability of surface rupture over reverse faults. In addition, numerical investigations indicate that the rupture history of native soil deposits also greatly influences the nature of rupture …
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Correlation of the Elastic Properties of Stretch Film on Unit Load Containment
… of this research was to correlate the applied material properties of stretch film with its elastic properties measured in a laboratory setting. There are currently no tools available for a packaging engineer to make a scientific decision on how one stretch film performs against another without …
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Structural Stiffness Gradient along a Single Nanofiber and Associated Single Cell Response
… previous studies have explored the role of material stiffness (Young's modulus: N/m2) on cell behavior including attachment, spreading, migration, cytoskeleton arrangement (stress fiber and focal adhesion distribution) and differentiation. In this study using our recently described …
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Simulation-Based Design Under Uncertainty for Compliant Microelectromechanical Systems
… compliant MEMS are sensitive to variations in material properties and geometry. This dissertation proposes approaches for design stage uncertainty analysis, model validation, and robust optimization of nonlinear compliant MEMS to account for critical process uncertainties including residual …
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Forced vibration and hygrothermal analysis of composite laminated beams under the action of moving loads
… by using empirical relations for degrading the material stiffness properties of the matrix. The corresponding ply properties are calculated using the rule of mixtures. A parametric study is conducted by varying the fiber volume fraction and the fiber orientation of the angle plies in the …
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Strategies for mitigating wind-induced motion in tall buildings through aerodynamic and damping modifications
… in construction methodology and high strength materials, has driven the height of modern skyscrapers beyond what was once deemed possible. Although science and technology has been able to increase the strength of building materials such as steel and concrete, their material stiffness has …
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Granular Composite with Addressable and Tunable Stiffness
… field of soft robotics is the ability to tune material stiffness. This adaptability is inspired from the natural ability of organisms to alter their stiffness to perform various tasks. The most common approach to mimic this ability is through granular jamming, where a granular material switches …
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Mechanical behavior of ultrastructural biocomposites
… nature has successfully developed biocomposite materials with detailed multiscale architectures to provide a material stiffness, strength and toughness. One such example is nacre, which is found in the shells of many mollusks, and consists of an inorganic phase of aragonite tablets 5-8jim in …
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Development and modeling of conducting polymer actuators and the fabrication of a conducting polymer based feedback loop
Conducting polymers as a class of materials can be used to build a diverse range of devices. Conducting polymer based actuators (muscles), transistors (neurons), strain gages (muscle spindles), force sensors (Golgi tendon organs), light emitting diodes, photodetectors (eyes), batteries and …
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An anisotropic damage model for rock
… to quantify the effect of microcracking on the material stiffness and the mechanisms of microcrack formation in brittle rocks under compression are discussed. The sliding crack concept is adopted as the micromechanical basis of the anisotropic damage model. Undamaged material is represented with …
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In vitro culture of a chondrocyte-seeded peptide hydrogel and the effects of dynamic compression
… of this ECM was paralleled by increases in material stiffness, indicative of deposition of mechanically-functional neo-tissue. Culture of chondrocyte-seeded peptide hydrogels in ITS-supplemented medium was investigated as an alternative to high serum culture. Low serum (0.2%), …
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A data-driven approach to online flight capability estimation
… its wing. Safety is assessed based on composite material failure allowables, representing damage to the wing via a local loss of material stiffness. Damage scenarios on the wing are simulated and stored for query during the flight scenario, where knowledge of the maximum maneuvering load factor …
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Optimal Design of an Enclosure for a Portable Generator
… that most acoustic text books ignore and how the material stiffness, density and source-to-enclosure distance affect the insertion loss and effectiveness of the enclosure. Measured and theoretical sound pressure level around the generator before and after the application of the enclosure are …
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Effect of Variation of the Systemic Parameters on the Structural Response of Single Degree of Freedom Systems Subjected to Incremental Dynamic Analysis
… Analysis. The systemic parameters are mass, stiffness, damping, yield strength and geometric stiffness. Each of these parameters was varied one at a time while the other values were kept constant. For each variation of parameters a set of single-record IDA curves was obtained. Five to six …
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Modeling the Effects of Mechanical Loading on Hypertrophic Cardiomyopathy Pathogenesis in Human Induced Pluripotent Stem Cell derived Micro Heart Muscle
… it was found that mechanical loading induced by material stiffness trigger early structure defects in micro-heart muscle derived from human induced pluripotent stem cells with a hypertrophic cardiomyopathy mutation. This led to micro-scale sarcomere structural defects, contractile dysfunction, …
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Study of creep characteristics of multi-layered corrugated fibre board protective cushions
… gaining attention as a replacement for polymeric materials for protective packaging for environmental reasons. The properties of pre-compressed multi-layered corrugated fibreboard make it a sustainable replacement for poly-foam and polystyrene. Pre-compressed multilayered fibreboard cushions have …
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