Effect of Carbon Nanotubes on CNT Reinforced FGM Nano Plate under Thermo Mechanical Loading

AbstractThis study analysis the effect of Carbon Nanotubes (CNT) on CNT reinforced Functionally Graded Materials (FGM) nano plate under mechanical and thermo mechanical loading using finite element analysis. Material properties of the plate are considered to be graded in the thickness direction linearly by varying numbers of CNTs in each layer. FGM plate results are compared with plane Al nano plate and CNT reinforced composite nano plate (same overall percentage of CNT) of same dimension and same boundary conditions.In investigation, it is found that CNT increases significant strength in both FGM and composite. But in mechanical loading, CNT provides more strength in composite compare to FGM, while in thermo mechanical FGM stronger than composite

Structural Dynamic Analysis of Freight Railway Wagon Using Finite Element Method

AbstractThis paper describes the development of a virtual freight wagon vehicle using virtual prototyping computer tools. The freight wagon considered as open type wagon “BOXN25” of the Indian Railways. The freight wagon vehicle comprises of car body structure and two bogies. Solidworks is used for modeling the freight wagon and the geometry is exported to finite element tool, ANSYS. A multi degree of freedom system has been reviewed and compared with system having infinite degree of freedom (continuous structure). The current problem falls in the category of large models (Block Lanczos Algorithm is used) and has high degrees of freedom (PCG Solver is used). The structural dynamic response for the virtual freight wagon is determined. It is seen that the car body deformation is influenced by its elastic underframe and sidewalls. The influence of vibration modes, which describe local deflection, on the comfort level and stability of laden goods is discussed. Mode shapes up to a frequency of 30Hz are considered

EPFM Analysis of Subsurface Crack Beneath a Wheel Flat Using Dynamic Condition

AbstractDuring running due to frequent braking and suddenly jamming of brakes the Railway wheel skids over rails. This frequent skidding removes large amount of metal from the surface known as Wheel-flat defect. In this paper the wheel-flat and a subsurface crack in the beneath is studied using FEA. If the wheel-flat is not detected early the subsurface crack can originate in the beneath due to inclusion, may leads to fatal accidents. In this study wheel material is taken Elastic-plastic and J-Integral factor has been obtained. The wheel–rail vehicle is modelled as a mass–spring–damper syste

Static Analysis of Functionally Graded Plate Using Nonlinear Classical Plate Theory with Von-Karman Strains

The present study is based on the nonlinear bending analysis of an FGM plate with Von-Karman strain based on the non-linear classical plate theory (NLCPT) with in-plane displacement and moderate rotation. Non-linear bending analysis based on stresses and transverse deflections is then carried out for the plate for the complex solution obtained using an analytical method viz. Navier’s method. The equations of motion and boundary conditions are obtained using the Principle of Minimum Potential Energy (PMPE) method and material property is graded in thickness direction according to simple power-law distribution in terms of volume fractions of the constituents. The effect of the span-to-thickness ratio and FGM exponent on the maximum central deflection and stresses are studied. The results show that the response is transitional with respect to ceramic and metal and the complex solution predicts the real behavior of stresses and deflections in the functionally graded plate. The functionally graded plate is found to be more effective for moderately thick and thick plates, which is inferred by a complex nature of the solution. For FGM plates, the transverse deflection is in-between to that of metal and ceramic rich plates. The complex nature of the solution also gives information about the stress distribution in the thickness direction

Processing of RZ5-10wt%TiC in-situ magnesium matrix composite

This paper discusses processing in-situ RZ5-10wt%TiC composite fabricated by self-propagating high temperature (S.H.S) method where RZ5 Mg alloy was the matrix and TiC as reinforcement. The purpose of this study is to improve the mechanical properties and wear resistance of the RZ5 alloy used in aerospace application by adding TiC particles. The wear test was performed using pin-on-disc apparatus against 600 grit abrasive paper by varying the sliding distance and applied load. The composite was microstructurally characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results exhibited that the tensile strength and hardness of the RZ5-10wt%TiC composite increased considerably while grain size decreased compare to the unreinforced RZ5 alloy. The SEM based fractography indicated mixed mode (quasi-cleavage and ductile feature) failure of the composite. Keyword: In-situ, MMC, Tensile strength, Composite, Reinforcemen