Có 40+ tài liệu thuộc chủ đề "Mechanical sciences"
tailieu.vn Xem trực tuyến Tải xuống
Strain energy spectral density and information content of materials deformation. Transformation mechanics Strain energy spectral density Mechanical metamaterials Information entropy. A broader range of analytical tools can enhance understanding of the unusual mechanical properties of meta- materials and other advanced material systems. Here, we discuss a mechanics analogue of the Parseval’s energy theorem that leads to a density of the...
tailieu.vn Xem trực tuyến Tải xuống
Design of dielectric elastomer actuators for vibration control at high frequencies. Vibration control Modal analysis Modal strain energy. Finally, a control simulation and a control experiment validate the vibration suppression effects and the efficacy of the DEA.. However, installing PZTs on a curved surface is difficult due to the rigidity of the structure. By taking advantage of the generation functions...
tailieu.vn Xem trực tuyến Tải xuống
Bragg edge neutron transmission imaging allows for the mapping of two-dimensional elastic strains and was used to identify the fatigue crack from the reduction in the strain in the region where the crack propagated. A finite element model of the cracked specimen was used to simulate the average through thickness strain that is measured by the Bragg edge neutron imaging...
tailieu.vn Xem trực tuyến Tải xuống
The main goal of this paper is to study selected aspects of the space-Fractional Continuum Mechanical model (s-FCM) approximation. The considerations include the in-depth analysis of three generalized finite difference schemes, which are based on: (i) The rectangle rule, (ii) the trapezoidal rule, and (iii) Simpson’s (parabolas) rule, respectively. The analysis includes the dynamic (eigenvalues) response of the 1D s-FCM...
tailieu.vn Xem trực tuyến Tải xuống
A set of me- chanical properties of the system is identified and then used to reproduce tests with finite element simulations.. Simultaneously they are one of the basic element of theoretical interest in applied mechanics and are modeled in numerous ways. The essential difference in the beam response may be observed if the model is nonlinear [1–4. Discrepancies between a...
tailieu.vn Xem trực tuyến Tải xuống
In the paper, the pendulum construction is modified by the use of two independent electromagnetic harvester systems. The second device is a DC electrical motor mounted in the pendulum’s pivot. The study gives an answer about effectiveness of the both harvesters and suggests that the proposed concept can be useful in practice.. The passive systems was one of the first...
tailieu.vn Xem trực tuyến Tải xuống
The root cause of the catastrophe is the strong non-linearity of the system. To this end, a modified method for establishing a mathematical model of the CFA catastrophe in double-edged cutting based on the catastrophe theory is proposed in this paper. Moreover, the sudden change of the shear area is utilized to tell the non-linearity of cutting process caused by...
tailieu.vn Xem trực tuyến Tải xuống
Local buckling based approach toward understanding of the material system behavior. As expected, due to the plastic buckling of the unit cells, thermal degradations of the tested metallic foams follow similar trends as does the yield stress of their bulk metals. Future work might explore how to take advantage of oxidation reactions at the surfaces of the cells in the...
tailieu.vn Xem trực tuyến Tải xuống
This paper presents an electromechanical analysis of the nonlinear static response and the superimposed small- amplitude wave characteristics in an infinite periodic compressible dielectric elastomer (DE) laminate subjected to electrostatic excitations and prestress in the thickness direction. The enriched Gent material model is employed to account for the effects of strain stiffening and electrostriction of the DE laminate. Numerical results...
tailieu.vn Xem trực tuyến Tải xuống
Based on nonsmooth multibody dynamics, a mathematical model is developed for studying the dynamical characteristics of the prototype. By using the model, we can reveal some hidden dynamics of the prototype and optimise its progression speed and energy efficiency. Developing small-size robots for examining the surface lining of the small intestine [1–7] is a challenging task, particularly for the design...
tailieu.vn Xem trực tuyến Tải xuống
An extended separation-of-variable method for the free vibration of orthotropic rectangular thin plates. This paper proposes a method to solve for closed-form analytical solutions of the free vibration problems of orthotropic rectangular thin plates with arbitrary homogeneous boundary conditions. The Navier method and the Levy method provide the exact solutions for the free vibration of rectangular plates with at least...
tailieu.vn Xem trực tuyến Tải xuống
To describe macro-properties of the considered material the homogenized model with microlocal parameters, presented by [ 1 , 2 ] was used. The paper shows contact pressures and stress distributions considered separately for both components of the composite material and results are presented in the form of graphs.. One of the types of materials used for components of contact pairs...
tailieu.vn Xem trực tuyến Tải xuống
Results of the present investigation demonstrate that: (1) friction modeling at the tool-chip interface has a remarkable influence on the numerical simulations of machining. (2) reliability of the friction parameters is substantially interrelated with the choice and reliability of the constitutive model parameters. State-of-the-art review of meshfree cutting simulations. are among the state-of-the-art of SPH models. State-of-the-art review of friction...
tailieu.vn Xem trực tuyến Tải xuống
This assumption implies equal displacements of the beam and the MSD system at the contact points. Special attention is paid to the appropriate formulation of the arrival and departure conditions of the MSD system on the beam. This approach is based on the dynamic substructuring technique (DST) [29,30] for coupling the equations of motion of the subsystems in state space....
tailieu.vn Xem trực tuyến Tải xuống
Predicting the failure of spot welds remains one of the most important modeling challenges in automotive engi- neering. In essence, the structure surrounding a spot weld corresponds to a graded material with severe variations in the plasticity and fracture properties as a function of the distance to the center of the weld nugget. Simula- tions are performed of all structural...
tailieu.vn Xem trực tuyến Tải xuống
Despite the print orientation (horizontal, side- wise, and vertical), the elastic modulus and strength at tensile failure of the 3D printed ABS were found to be less than its cast counterpart, by 41% and 46%, respectively. The experimental compressive mechanical properties were predicted, within a 2% error, by using the ratio of the overall cross-sectional area of the horizontally and...
tailieu.vn Xem trực tuyến Tải xuống
One of the most challenging problems one can set a composites dam- age model is bearing failure of composite joints, involving as it does, all the main composites failure modes. one of the first three-dimensional (3D) models to follow the bearing re- sponse of pin-loaded composites up to and beyond peak load (up to 0.25 mm beyond) and demonstrated excellent...
tailieu.vn Xem trực tuyến Tải xuống
An elastic-viscoplastic constitutive material model is developed for the representation of the creep response of a 10%Cr steel under cyclic loading conditions. The developed model is a variant of the well-known Chaboche viscoplastic constitutive model, and employs a bi-term power-law equation to represent the stress-regime dependence of the viscoplastic strain rate response. Back stress and drag stress are used to...
tailieu.vn Xem trực tuyến Tải xuống
Fully-coupled Computational Modeling of the Dynamic Response of 1-3 Multiferroic Composite Structures. Composite geometry, configuration, and loading parameters were selected following prior experimental studies to simulate realistic operating conditions of the multiferroic structure, where the latter was used to validate the results of the computational model. The electric, magnetic, and mechanical responses of the multiferroic composite structure were vigorously investigated...
tailieu.vn Xem trực tuyến Tải xuống
Finally, we provide the topological phase diagrams to demonstrate the tunable position and existence condition of the topological interface states when tuning the external loading. The theoretical development has motivated some experimental efforts in realization of the topological PCs [11–18. For more detailed discussion of the recent progress in the topological acoustic/mechanical systems, interested readers are referred to the comprehensive...