Muhannad Al-Waily
Asst. Prof. Dr. Muhannad Al-Waily, Lecturer in Kufa University-Faculty of Engineering-Mechanical Engineering Department. Ph.D. in Mechanical Engineering-Applied Mechanics. Has published many academic oriented papers and books. Specialization: Vibration Analysis, Stress Analysis under Static and Dynamic Loading, Composite Materials, Fatigue Analysis of Engineering Materials, Mechanical Properties of Engineering Materials, Control and Stability of Mechanical Application, Damage (Crack and Delamination Analysis), Buckling Analysis, plate and shell study, vibration of composite beam; plate and shell analysis, flow induce vibration analysis, heat induce vibration analysis and other mechanical researches.
Associate Editors of the International Energy and Environment Foundation (IEEF)-Applied Mechanics Research Center. Editor-in-Chief of International Journal of Energy and Environment (IJEE)-Issue on Applied Mechanics.
Website: http://staff.uokufa.edu.iq/en/profile.html?muhanedl.alwaeli
Contact: [email protected]
Supervisors: Prof. Dr. Muhsin J. Jweeg
Associate Editors of the International Energy and Environment Foundation (IEEF)-Applied Mechanics Research Center. Editor-in-Chief of International Journal of Energy and Environment (IJEE)-Issue on Applied Mechanics.
Website: http://staff.uokufa.edu.iq/en/profile.html?muhanedl.alwaeli
Contact: [email protected]
Supervisors: Prof. Dr. Muhsin J. Jweeg
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Design/methodology/approach: Carbon nanotubes with various percentages of multi-walled carbon nanotubes exposed to high tensile stress were used to enhance the mechanical qualities of N.R. rubber.
Findings: In this work, carbon nanotubes have been added to natural rubber. By using a solvent casting technique, toluene was used to make nanocomposites. 0.2%, 0.4%, 0.6%, 0.8%, and 1%. In this article, rubber and multi-walled carbon nanotubes interact in practical ways. Mechanical features of carbon nanotubes in NR have been researched. The results will lead to rubber products with improved mechanical qualities compared to present nanocomposite rubber containing various percentages of multi-walled carbon nanotubes exposed to large tensile test loading. The relative fitness error for significant stresses is reasonable with a second or third-order deformation model in numerical results.
Research limitations/implications: Non-linear finite element analysis is widely used to optimise complicated elastomeric components' design and reliability studies. However, accurate numerical results cannot be achieved without using rubber or rubber nanocomposite materials with reliable strain energy functions.
Practical implications: The indentation tensile tests of rubber samples have been simulated and confirmed using a parametric FE model. An inverse materials parameter identification algorithm was used to calculate the hyperelastic material properties of rubber samples evaluated in uniaxial tensile. Using ABAQUS FE software, material parameters and force-displacement data may be automatically updated and extracted.
Originality/value: The numerical data for the inverse method of material property prediction has been successfully established by developing simulation spaces for various material characteristics. The force-displacement curve can be represented using technical methods. The results demonstrate that the inverse FE modelling process might be simplified by using these curve fitting parameters and plot equations to build a mathematical link between curve coefficients and material properties. The first, second, and third-order deformation models were tested using FE simulations for the tensile test.
Design/methodology/approach: Carbon nanotubes with various percentages of multi-walled carbon nanotubes exposed to high tensile stress were used to enhance the mechanical qualities of N.R. rubber.
Findings: In this work, carbon nanotubes have been added to natural rubber. By using a solvent casting technique, toluene was used to make nanocomposites. 0.2%, 0.4%, 0.6%, 0.8%, and 1%. In this article, rubber and multi-walled carbon nanotubes interact in practical ways. Mechanical features of carbon nanotubes in NR have been researched. The results will lead to rubber products with improved mechanical qualities compared to present nanocomposite rubber containing various percentages of multi-walled carbon nanotubes exposed to large tensile test loading. The relative fitness error for significant stresses is reasonable with a second or third-order deformation model in numerical results.
Research limitations/implications: Non-linear finite element analysis is widely used to optimise complicated elastomeric components' design and reliability studies. However, accurate numerical results cannot be achieved without using rubber or rubber nanocomposite materials with reliable strain energy functions.
Practical implications: The indentation tensile tests of rubber samples have been simulated and confirmed using a parametric FE model. An inverse materials parameter identification algorithm was used to calculate the hyperelastic material properties of rubber samples evaluated in uniaxial tensile. Using ABAQUS FE software, material parameters and force-displacement data may be automatically updated and extracted.
Originality/value: The numerical data for the inverse method of material property prediction has been successfully established by developing simulation spaces for various material characteristics. The force-displacement curve can be represented using technical methods. The results demonstrate that the inverse FE modelling process might be simplified by using these curve fitting parameters and plot equations to build a mathematical link between curve coefficients and material properties. The first, second, and third-order deformation models were tested using FE simulations for the tensile test.
The existence of a defect like a crack which will lead to change in fundamental natural frequency of the plate and enlargement of the crack will also lead to another change in fundamental natural frequency with the change of the size or position of the crack. So this study focuses on finding the fundamental natural frequency for composite plates with crack, considering the size of the crack (crack length and depth through plate thickness) and crack position in the plate in x and y directions, as well as slant of the crack.
The study of the fundamental natural frequency of the composite plate is done on many types of composite plates, according to the shape of the used fibers. So this involves a study of properties and types of composite materials. The study also handles the desperation of composite material containing particles, powder, short fibers, long fibers and mat, which an strengthened by particles and short fibers which give isotropic materials and strengthening by long fibers and mat gives orthotropic material. The composite materials are tested to find their properties experimentally by preparing patterns and changing volume fraction of fibers and matrix analytically. A comparison is made between the analytical and experimental results where the error percentage was found not to exceed 8%.
The fundamental natural frequency is studied for composite material strengthened by particles, powder, short fibers, long fibers and mat, in terms of the effect of crack size and position, plate thickness, aspect ratio and the type of plate fixing where three types of fixing were used (SSSS, SSCC, SSFF).
Three methods are used to find the fundamental natural frequency of composite plate: First method is analytical solution to solve the equation of motion considering the effect of size, position and crack slope angle on the fundamental natural frequency of the composite plate. Second method is finite element solution using ANSYS (ver. 14) program. Third method is an experimental method, applying a time varied load to measure the fundamental natural frequency of the plate. A comparison is made between the three methods and the error percentage in the results does not exceed 8.5%. in addition to comparison between the present theoretical and numerical results with results presented by S. E. Khadem and M. Rezaee-a (2000), where the error not exceed 4%.
The results show that the fundamental natural frequency decreases as crack size (length or width) increases to (5%) with crack length (10%a) to (8%) with crack length (20%a) and crack depth ratio (0.7). The fundamental natural frequency decreases when the crack is in the middle of the plate larger than from any position in the plate, decreasing of the natural frequency to about 6%. The effect of crack when reaches the middle is higher than when it’s in the other places. The fundamental natural frequency decreases as plate width increases, (aspect ratio and plate thickness).
Also the results show that sensing of the fundamental natural frequency of cracked plate is decreased as plate elasticity decreases. i.e. the fundamental natural frequency for plate without crack decreases more than when the plate is with crack by increasing the plate elasticity through increasing modulus of elasticity, decreasing plate width(aspect ratio), increasing plate thickness or increasing fiber volume fraction. Also the amount of decreasing in fundamental natural frequency increases when the crack is inclined with an angle than that without inclination angle, because the effect of the crack distributed on both sides of the plate will be a largest.
Also, the effect of powder reinforcement on the natural frequency of unidirectional and woven hyper composite material beam was studied. The study of natural frequency was evaluated with three methods, the first is theoretical method with driving of the general equation of beam motion with shear deformation and rotary inertia effects, the second is driving of the general equation of motion for single degree of freedom beam, and the third is the numerical method with finite element method by using Ansys program Ver. 14. The study included the powder reinforcement volume fraction effect for hyper composite material beams of the following types: unidirectional, woven hyper composite beams with different volume fractions of fiber. Polyester and epoxy materials were used as resin materials for hyper composite materials. The natural frequency results of hyper composite beam with different volume fractions of reinforcement effect showed that the addition of reinforcement powder increases the strength of composite materials, and then, increases the natural frequency of beam. In addition, the evaluated results with theoretical methods and numerical method are compared and it showed a good agreement with maximum error about (1.8%).
The results are the response ,stresses, and inter-laminar shear stresses, solution by first order shear deformation theory "FSDT", for symmetric and antisymmetric, cross-ply and angle-ply, laminated plates subjected to the static and dynamic loading conditions considered here is the sine, rectangular, expanison, ramp and triangular pulses while spatially, they are considered as central sinusoidal and uniformly distributed load for stiffened and unstiffened laminated plates. In addition, the results for deflections, stresses and inter-laminar shear stresses are presented showing the effect of plate side-to-thickness ratio, aspect ratio, material orthotropy, fiber orientation, boundary conditions and lamination scheme and are confirmed with other solutions and finite element results. The analysis results for deflection, stresses and inter-laminar shear stresses of stiffened laminated plates are presented showing the effect of number of stiffeners, high to width of stiffener ratio, high of stiffener, the width of stiffener, and the stiffener properties and are confirmed with other solutions and finite element results.
The results obtained are the deflection, stresses, and inter-laminar shear stresses of un-stiffened plates are decreases with increasing the number of layer, fiber orientation (optimum angle =450), or thickness of laminated plates. In addition the deflection, stresses, and inter-laminar shear stresses for stiffened laminated plates are decreases with increasing the number of stiffeners, thickness, or height of stiffeners.