Buckling analysis of reinforced composite plates with a multiwall carbon nanotube (MWCNT)

Abstract

Buckling analysis of mechanical structures is essential to insure stability under loading .Critical load of buckling refer to the maximum load can be withstood without losing of stability and avoid a catastrophic damage due to the collapse of columns .Improving of mechanical properties spatially those related with elastic behaviors of materials can lead to improving buckling since it can be raised the value of critical load. Nanotechnology is one of the modern methods which makes significant effects on the mechanical properties of materials. In the field of composite materials this technology leads to valuable improvements for the favorite properties. In this regard Nano composite materials are paid a spatial attention in research for the last decade. The main aim of the present work is to investigate the effect of Nano carbon weight fraction on buckling of the composite plate. Five samples of Nano composite plates were prepared and fabricated for experimental investigations .The plate samples are combined of woven reinforcement fiber and polyester matrix with Carbon .The weight fraction of Nano additives are 0 %, 0.5%, 1%, ,1.5 and 2%, of resin materials weight. To provide homogenous composite an ultrasonic homogenizer is utilized. The experimental work include buckling test for different Nano plates samples with simply supported at two ends and free at the other .Finite Element analysis was achieved via ANSYS R15.0 with proper elements ,meshing ,boundary condition and static analysis .It is found that increasing of Nano carbon weight ratio tends to increase critical load of buckling ,the maximum buckling load is at 2% wt ratio and the experimental results shows fair validation for the numerical analysis where the maximum error dos not exceeded 15% .

Experimental and modeling stress concentration factor (SCF) of a tension poly lactic acid (PLA) plate with two circular holes

“…Figure 9. Von Mises Stress distribution for PLA+15%Carbon plate with two holes Whereas σ max : maximum nodal Von mises stress σ nom : average Von mises stress Based on the results of the analysis and the use of equation 3, the theoretical stress concentration of the plate (PLA, PLA with 15% carbon) was 2.16 and 2.35 respectively, As in Table (II) which is consistent with the source (12,13) about that the coefficient of stress concentration is a function depending on the material and geometry of the part. If the material is brittle or ductile with the type of loading mode (type) at the load is static or dynamic.…”

Energy dissipation in the regulators using straight wall baffles

“…The governing equations of this study are based on the one-dimensional flow of an open channel, which are continuity and energy equations. The way in which the suggested configuration are compared depends primarily on energy loss as a result of the settling basin, where the specific energy of flowing water is expressed by the following formula [7][8][9]: 1where y is the flow depth (m), V is the mean velocity (m/s), and g is the acceleration of gravity (m/s 2 ). The specific energy (E) of a fluid in an open channel is defined as the total mechanical energy (expressed as a head) relative to the bottom of the channel.…”

“…Many studies have been carried out on the form, size, and details of stilling basins. In a study conduct-ed by [7] that dealt with a stilling basin provided with an intermediate sill, the impact of a constant, trans-verse sill on the hydraulic jump was evaluated. It was discovered that a sill-controlled energy dissipater could be much more effective and requires both less tailwater and duration of basin compared to free jump-ing.…”