Applied Mechanics Research Papers - Academia.edu (original) (raw)

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- Mechanical Engineering, Civil Engineering, Aerospace Engineering, Modeling

We consider phase transitions in solids due to heat propagating through crystalline materials at low temperatures. These are considered in a steady state context where, at the transition temperature, the specific heat becomes singular and the heat conductivity has a maximum. Several consequences are found for the heat capacity having finite or infinite jump discontinuities.

- by Ralph Saxton
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- Mathematics, Applied Mechanics, Steady state, Heat Capacity

Elastomer based pressure sensitive adhesives used in various peeling applications are viscoelastic and expected to be rate sensitive. The effects of varying peel velocity on adhesion energy and its dependence on the peel angle and rate of peeling are investigated. Experiments are conducted on an adhesive tape using a displacement-controlled peel test configuration. By adjusting the peel arm length, the peel velocity can be continuously varied though the extremity of the film is displaced at a constant rate, which results in nonsteady peeling. Constant peel rate tests are performed over a wide range of peeling rates for a fixed peeling angle, which results in steady state peeling. Based upon the experimental data, a power law relation for the adhesive energy of a packaging tape and its dependence on the rate of peeling is presented. The applicability of the rate dependent law for adhesion energy based upon the steady state experiments to the nonsteady peeling process is critically ex...

- by Alain Molinari
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- Mechanical Engineering, Civil Engineering, Aerospace Engineering, Packaging
- by Marc Meyers
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- Mechanical Engineering, Civil Engineering, Aerospace Engineering, Applied Mechanics
- by Sylvain Galland
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- Materials Engineering, Materials Science, Applied Mechanics, Cellulose
- by Dirk Lefeber and +3
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- Materials Engineering, Mechanical Engineering, Robotics, Applied Mathematics
- by Jonathan bates
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- Food, Environmental Management, Applied Mechanics, Multidisciplinary
- by Asif Israr
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- Applied Mechanics
- by Peter R Greene
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- Bioengineering, Fluid Mechanics, Aerodynamics, Applied Mechanics
- by Tomas Nordstrand
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- Mechanics, Applied Mechanics

In this presentation the general motion of an asymmetrical homogeneous rigid body in a fluid environment is studied. By means of a defined new theorem – The Theorem for changing the rigid body general impulse and new form of Lagrange equations, called Lagrange condensed equations, the differential equations describing the three-dimensional motion of the body in a matrix form is obtained. With a new theorem for the fluid flow of an asymmetrical rigid body, the presence of a destabilizing aerodynamic moment is proved. A new complete matrix of aerodynamic forces is defined. The spherical component of body general motion is counted with Cardan corners. The paper is entirely theoretical. It is the basis on which a second paper on the motion of an ideal rigid ellipsoid in a fluid environment is developed.

- by Anastas Ivanov Ivanov
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- Theoretical Physics, Fluid Mechanics, Applied Mechanics, Fluid Dynamics
- by Nicos Makris
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- Civil Engineering, Geology, Soil Science, Structural Engineering

SUMMARYA weak form of the anisotropic Biot's equation represented in a cylindrical coordinate system using a spatial Fourier expansion in the circumferential direction is presented. The original three dimensional Cartesian anisotropic weak formulation is rewritten in an arbitrary orthogonal curvilinear basis. Introducing a cylindrical coordinate system and expanding the circumferential wave propagation in terms of orthogonal harmonic functions, the original, geometrically rotationally symmetric three dimensional boundary value problem, is decomposed into independent two‐dimensional problems, one for each harmonic function. Using a minimum number of dependent variables, pore pressure and frame displacement, a computationally efficient procedure for vibro‐acoustic finite element modelling of rotationally symmetric three‐dimensional multilayered structures including anisotropic porous elastic materials is thus obtained. By numerical simulations, this method is compared with, and th...

- by Nils-Erik Horlin
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- Engineering, Applied Mechanics, Porous Media, Anisotropic
- by Ulrich Hirn and +1
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- Applied Mechanics
- by Xi-Qiao Feng
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- Mechanical Engineering, Civil Engineering, Biomimetics, Applied Mechanics

The increase in using the composite materials in engineering applications make it necessary to improve the properties of composite materials to be able doing its work . One of the method to improve the mechanical properties for fibrous composite materials is Pre-stressing the fibers during room temperature curing process . This process give the more stiffness for composite and make it more stronger and able to withstand the loading subjected to it . This paper show that the pre-stressing fiber process on the glass fiber/epoxy composite materials will give the more strength and make the composite able to carry larger load . The pre-stressing fibers level will be ( 0 , 2 , 4, 6, 8, 10 , 15 , and 20MPa) that applied on the E-glass fibers with epoxy resin during the curing process with fiber volume fraction about (30%) , and after solidification complete the samples tested under tensile loading by using INISTRON machine . The results show the improvement in tensile strengths reach to(70%) at pre-stressing level (20MPa) while the increasing in maximum tensile strain reach to( 46%) . The modeling of composite samples subjected to tensile load by using finite element method with package (ANSYS V.10) .
The relation between pre-stress levels and maximum deformation at different external loading between (1kN to 4.5kN) for composite sample were plotted for experimental and finite element results . The differences between experimental and ANSYS results was about (6-12%).

- by Ali S Yasir
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- Solid Mechanics, Composite Materials, Applied Mechanics
- by Kirk Davies
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- Food, Environmental Management, Applied Mechanics, Multidisciplinary
- by David Waldron and +1
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- Applied Mechanics

This paper presents the higher order extension of Particle Discretization Scheme (PDS) and its implementation in FEM framework (PDS-FEM) to solve boundary value problems of linear elastic solids, including brittle cracks. Higher order PDS defines an approximation fd(mathbfx)f^d(\mathbf{x})fd(mathbfx) of a function f(mathbfx)f(\mathbf{x})f(mathbfx), defined over domain Omega\OmegaOmega, as the union of local polynomial approximation of f(mathbfx)f(\mathbf{x})f(mathbfx) over each Voronoi tessellation elements of Omega\OmegaOmega. The support of the local polynomial bases being confined to the domain of each Voronoi element, fd(mathbfx)f^d(\mathbf{x})fd(mathbfx) consists of discontinuities along each Voronoi boundaries. Considering local polynomial approximations over elements of Delaunay tessellation, PDS define bounded derivatives for this discontinuous fd(mathbfx)f^d(\mathbf{x})fd(mathbfx). Utilizing the inherent discontinuities in fd(mathbfx)f^d(\mathbf{x})fd(mathbfx), PDS-FEM proposes a numerically efficient treatment for modeling cracks. This novel use of local polynomial approximations in FEM is verified with a set of linear elastic problems, including mode-I crack tip stress field.

- by Mahendra Kumar Pal and +2
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- Computational Mechanics, Applied Mechanics, Fracture Mechanics, Applied Numerical Methods in Engineering
- by Mathias Barbagallo and +1
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- Applied Mechanics
- by Zargham fazel niari and +1
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- Engineering, Design, Construction, Applied Mechanics
- by Azdiana Yusop
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- Engineering, Applied Mechanics, Performance Analysis, Motion estimation

This paper reports on theoretical and experimental investigations into the buckling characteristics of a series of six ring-stiffened circular cylinders that experienced general instability when subjected to external hydrostatic pressure. Each study used between 3-5 designs with the same internal and external diameters, but with different numbers and sizes of ring-stiffeners. Four used designs that were machined to a high degree of precision from steel, while the other two were machined from aluminium alloy. The theoretical investigations focused on obtaining critical buckling pressure values, namely Pcr, for each design from the well-known Kendrick’s Part I and Part III theories, together with an ANSYS finite element prediction. The thinness ratio λ1, which was originally derived by the senior author, was calculated together with a dimensionless quantity called the plastic knockdown factor (PKD), for each model. The plastic knockdown factor was calculated by dividing the theoretica...

- by Andrew Little
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- Engineering, Applied Mechanics

The uplifting and rocking of slender, free-standing structures when subjected to ground shaking may limit appreciably the seismic moments and shears that develop at their base. This high-performance seismic behavior is inherent in the design of ancient temples with emblematic peristyles that consist of slender, free-standing columns which support freely heavy epistyles together with the even heavier frieze atop. While the ample seismic performance of rocking isolation has been documented with the through-the-centuries survival of several free-standing ancient temples; and careful post-earthquake observations in Japan during the 1940's suggested that the increasing size of slender free-standing tombstones enhances their seismic stability; it was George Housner who 50 years ago elucidated a size-frequency scale effect that explained the " counter intuitive " seismic stability of tall, slender rocking structures. Housner's 1963 seminal paper marks the beginning of a series of systematic studies on the dynamic response and stability of rocking structures which gradually led to the development of rocking isolation—an attractive practical alternative for the seismic protection of tall, slender structures. This paper builds upon selected contributions published during this last half-century in an effort to bring forward the major advances together with the unique advantages of rocking isolation. The paper concludes that the concept of rocking isolation by intentionally designing a hinging mechanism that its seismic resistance originates primarily from the mobilization of the rotational inertia of its members is a unique seismic protection strategy for large, slender structures not just at the limit-state but also at the operational state.

Green concrete is a concrete that supports the content of CO2 emissions reductions by using waste industries as cement replacement. The waste industries that commonly can be used in green concrete mixture design are fly ash, blast furnace slag, silica fume, and rice husk ash. The present of supplementary cementitous material in green concrete mixture can increase both compressive strength and cement efficiency. The higher of cement efficiency, the higher compressive strength and the lower cement content will be. Densified Mixture Design Algorithm (DMDA) is a method that has been widely applied to concrete constructions in Taiwan. DMDA method can support the higher of cement efficiency in green concrete design. By using DMDA to create green concrete with supplementary cementitous material can increase the life of concrete and hence reduce life-cycle cost.

In this article the identification of the material parameters occurring in isotropic and incompressible hyperelasticity relations of generalized polynomial-type is discussed. The underlying strain-energy function depends on the first and... more

- by Stefan Hartmann
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- Engineering, System Identification, Applied Mechanics, Parameter estimation
- by Tomas Nordstrand
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- Mechanics, Applied Mechanics
- by Alan Howe
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- Applied Mechanics, Acupuncture, Confocal Microscopy, Cytoskeleton
- by Daniele Peri and +1
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- Engineering, Nonlinear Programming, Verification and Validation, Applied Mechanics
- by Adrian Bejan
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- Engineering, Mechanical Engineering, Civil Engineering, Aerospace Engineering
- by Minh Điền Phan
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- Engineering, Mechanical Engineering, Control Theory, Finite Element Methods

Course is intended for Undergraduate Mechanical Engineering students involving on Understanding Kinematics of Mechanisms, simple mechanism study, Velocity and acceleration analysis of mechanisms, Problem solving on Belt drives, Rope drives, Using Graphical analysis of generating Cam Profiles, Study of all types of gear drives and problem solving on spur gears, study on control and regulation of Governors.

- by Kiran K U M A R Kudumula
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- Mechanical Engineering, Robotics, Design, Computational Mechanics

This paper studies the influence of road camber on the stability of single-track road vehicles. Road camber changes the magnitude and direction of the tire force and moment vectors relative to the wheels, as well as the combined-force limit one might obtain from the road tires. Camber-induced changes in the tire force and moment systems have knock-on consequences for the vehicle’s stability. The study makes use of computer simulations that exploit a high-fidelity motorcycle model whose parameter set is based on a Suzuki GSX-R1000 sports machine. In order to study camber-induced stability trends for a range of machine speeds and roll angles, we study the machine dynamics as the vehicle travels over the surface of a right circular cone. Conical road surfaces allow the machine to operate at a constant steady-state speed, a constant roll angle, and a constant road camber angle. The local road-tire contact behavior is analyzed by approximating the cone surface by moving tangent planes lo...

- by Kiran K U M A R Kudumula
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- Mechanical Engineering, Design, Instructional Design, Curriculum Design

En nuestro diario vivir, inconscientemente nos encontramos interactuando con un fluido, por ejemplo, cuando respiramos estamos inhalando y exhalando el aire de la atmósfera, que es un fluido en estado gaseoso, o cuando bebemos agua, estamos interactuando con un fluido en estado líquido, pero también lo hacemos cuando caminamos, corremos, nadamos, saltamos, sudamos, y un sin número más de actividades que podamos realizar, por tanto, sin importar donde vayamos en el planeta, y la actividad o el trabajo que realicemos, siempre estaremos interactuando con un fluido.

- by Kevin Toala Vite
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- Fluid Mechanics, Applied Mechanics, Mecanica de los Fluidos
- by Sharanu Bhurke
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- Engineering, Applied Mechanics, Interior Point Methods, VIBRATION ANALYSIS
- by Yousef Abbaspour-Gilandeh
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- Engineering, Design, Construction, Applied Mechanics

Course intended for Undergraduate and Post Graduate Level Mechanical Engineering Vibrations course including Undamped free vibrations, Damped free vibrations, Transverse vibrations, Torsional Vibrations of multi degree of freedom and geared systems, Forced Vibrations,Determining equation of Motion of Two and Multi degree freedom systems by Euler- Lagrangian Method and Vibration measurements.

- by Mulumba Mathias
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- Engineering, Applied Mechanics

In this paper, an inverse analysis technique is used to obtain the flow curve of materials in a hot rolling
finishing mill. This technique is based on minimization of the differences between the experimental and
computed values. The flow curves and the friction coefficients at roll/work-piece interface are derived from
two different models. Model I is based on simple slab method of analysis. Model II is based on a modified
slab method in which the effect of shear stress in calculating the rolling force and torque is taken into
account. It is shown that the developed inverse analysis technique is reliable and can simultaneously
determine a more accurate flow stress for the material as well as a better estimation for the interface friction
factors.

- by Parya Aghasafari
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- Applied Mechanics
- by Joji Trivandrum
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- Engineering, Mechanical Engineering, Civil Engineering, Aerospace Engineering
- by Tomas Nordstrand
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- Mechanics, Applied Mechanics
- by Amir Shafie
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- Engineering, Automotive Systems Engineering, Applied Mechanics, Automobile