Study of the stress-strain behaviour of municipal solid waste (MSW) is important in landfill design and management. Non-linear elastic constitutive models are usually in a simple form and convenient in engineering applications; however, most existing non-linear elastic models do not adequately consider the dilatancy behaviour, which has a significant influence on the strength and deformation behaviours of MSW. In this paper, a non-linear elastic model for the prediction of stress-strain behaviour of MSW is proposed based on the results of consolidated drained triaxial compression tests. The influence of dilatancy behaviour is identified and highlighted. The generalised shear stress can be normalised well by dividing the shear stress by the power function of the mean normal stress. Total expressions of normalised volumetric strain and generalised shear strain were established, and the dilatancy modulus and hardening modulus of the proposed model were obtained. The proposed model was used to simulate test results obtained from both published studies and the authors' laboratory testing. The simulation results were in good agreement with the experimental values in general, although deviations were observed in the simulations of volumetric strain or shear stress for the high-dispersion characteristics of MSW.
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With the automotive electronics technique getting the fast development, the wireless communication technique on vehicles have the huge market potential. This paper takes the cantilever beam MEMS switch as an example to discuss mechanical principle and function simulation of the RF MEMS switch in Vehicle-carried radio frequency communication, we select three kinds of the cantilever beam with different section to analyze their switch characteristic, and to compute and use the software of ANSYS to carry out multiphysical coupling analysis and simulation. The relation between the distortion of the cantilever beam and the threshold voltage and the inherent frequency of three kinds of the beam is discussed. The results provide a good theoretical help in designing various high performance RF MEMS switches with the variational section beam.
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