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Showing 1 to 20 of 67 for “"Viscoelastic material"”.
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Some Aspects of Stochastic Processes Due to Random Viscoelastic Material Properties
Made available in DSpace on 2014-12-09T18:12:28Z (GMT). No. of bitstreams: 1 7020996.pdf: 2926603 bytes, checksum: d8264a89ef0bde2fdd17836178129903 (MD5) Previous issue date: 1970
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Structure-thermal coupling in viscoelastic material in rubber bushing of vehicle system
… research is to utilize the frequency-dependent viscoelastic material model and characterize the dynamic response of rubber bushing under external excitation. Furthermore, with appropriate modeling, two heat generation mechanisms of rubber bushing are explored and their thermal fields are …
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Optimized finite difference schemes for wave propagation in high loss viscoelastic material
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994.
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Finite element analysis of anisotropic viscoelastic composite structures and analytical determination of optimum viscoelastic material properties
Quasi-static linear anisotropic viscoelastic responses of composite structures subjected to mechanical and hygrothermal loads are formulated in terms of finite element algorithms. Laplace and/or Fourier transforms rather than direct time integrations are used in this formulation in order to improve …
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A New Visco-Plastic Device for Seismic Protection of Structures
… The device consists of a block of a high-damping viscoelastic material sandwiched between two steel shapes (plates or channels) bent in a certain configuration to amplify the deformations in the device in order to obtain large tensile and compressive strains in the viscoelastic material. Under low …
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Complex mechanical design of bio-inspired model transient network hydrogels
The mechanical properties of viscoelastic soft materials are strongly time-dependent, such that we must describe their mechanical properties with material functions. This is an inherently difficult problem for materials scientists: typically,we define structure-property relationships in terms of …
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On the damping of flexural plate vibrations by the application of viscoelastic layers
… plate due to the application of arbitrary viscoelastic layers on either side is solved within the framework of linear first order plate theory. For algebraic simplicity, only one-dimensional motion is considered, and the damping is assumed to be small. The question of dynamic coupling …
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Passive Damping in Stiffened Structures Using Viscoelastic Polymers
… from a system is passive damping, by using a viscoelastic material. This dissertation will primarily focus on constrained layer passive damping treatments in structures and the investigation of associated complex modes. The key idea behind constrained damping treatment is to increase damping …
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Interação de sistemas solo-estaca submetidos a solicitações dinâmicas
… cross section, modelling the soil as a linear viscoelastic material. A comparison with the model of lumped mass is performed for sensitivity studies, discussing the differences between the two approaches and the role played by several factors.
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Multi-Scale Physics Based Modeling of Tire Rolling Resistance Considering Aging
… energy when it rotates on a substrate due to the viscoelastic material's internal friction: a phenomenon referred to as rolling resistance. The interaction between the tire and the road surface is one of the most intricate and crucial phenomena in an automobile, because it is responsible for …
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Effects of creep and shrinkage on the behavior of reinforced concrete gable roof hyperbolic-paraboloids
… special characteristics of concrete, as an aging viscoelastic material, allow the increase of deflections in time under constant load; in addition, concrete shrinks when drying, and consequently, stress redistributions due to geometric changes take place. It therefore follows that reinforced …
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Methods for the integrated design of viscoelastic materials and structural geometry
… engineers have traditionally selected simple materials, including linear elastic solids and Newtonian fluids, for their designs, and optimize designed systems within the limitations of preselected materials. However, allowing complex materials (e.g., viscoelastic materials and soft solids) as …
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Implementation of viscoelastic Hopkinson bars
The properties of soft, viscoelastic materials at high strain rates are important in furthering our understanding of their role during blast or impact events. Testing these soft or low impedance materials using metallic bars in a split Hopkinson pressure bar setup, poor signal to noise ratios and …
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Influences of Higher Order Modeling Techniques on the Analysis of Layered Viscoelastic Damping Treatments
… reasonable when the core layer, normally a soft viscoelastic material(VEM), is thin and the constraining layer is weak in bending, there are many situations in industry and in the literature where the ``Mead and Markus'' (MM) assumptions should be questioned. An important consequence of the MM …
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Enabling design with rheological complexity: intuition and optimization of viscoelastic materials
… design based on rheologically complex materials. Traditionally, engineers choose hard materials or simple fluids for design. Complex materials (soft solids and non-Newtonian fluids) greatly increase the design space. Additionally, these materials add functionality (viscoelasticity, …
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Estimation of Adhesive Bond Strength in Laminated Safety Glass Using Guided Mechanical Waves
… laminated safety glass is primarily due to the viscoelastic material properties of the PVB plastic interlayer. The attenuation properties of S1 mode were also explored to estimate the adhesive bond strength between the plastic interlayer and the two adjacent glass plates. Results show that the …
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Elastic stiffening in PVA-Borax studied with experimental medium amplitude oscillatory shear
… as a tool to measure asymptotically nonlinear viscoelastic material functions across a range of compositions of PVA-Borax with storage moduli ranging from $G_0 \approx 100-3000$~Pa. The material functions can be related to model parameters to gain physical insight into the structure of the …
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Stress Transfer and Structural Failure of Bilayered Material Systems
Bilayered material systems are common in naturally formed or artificially engineered structures. Understanding how loads transfer within these structural systems is necessary to predict failure and develop effective designs. Existing methods for evaluating the stress transfer in bilayered materials …
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Damping of Vibration Using Periodically Voided Viscoelastic Metamaterials
… thesis investigates the damping effects of a metamaterial, on structural vibration, by inducing periodic voids in the base damping material as opposed to infusing the damping material with other material. Metamaterials have been used previously to improve the damping of vibrational waves and …
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Viscoelastic Properties of Polymer Composites During Processing
In this work several aspects of the curing, viscoelastic, and cure shrinkage behavior of an aerospace grade epoxy resin were characterized and modeled for the purpose of composites process modeling. Measurement of matrix viscoelastic properties during cure was accomplished through two experimental …
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