ANSYS Results Research Articles

Analytical solution for a circular roadway considering the transient effect of excavation unloading

The rocks surrounding a roadway exhibit some special and complex phenomena with increasing depth of excavation in underground engineering. Quasi-static analysis cannot adequately explain these engineering problems. The computational model of a circular roadway considering the transient effect of excavation unloading is established for these problems. The time factor makes the solution of the problem difficult. Thus, the computational model is divided into a dynamic model and a static model. The Laplace integral transform and inverse transform are performed to solve the dynamic model and elasticity theory is used to analyze the static model. The results from an example show that circumferential stress increases and radial stress decreases with time. The stress difference becomes large gradually in this progress. The displacement increases with unloading time and decreases with the radial depth of surrounding rocks. It can be seen that the development trend of unloading and displacement is similar by comparing their rates. Finally, the results of ANSYS are used to verify the analytical solution. The contrast indicates that the laws of the two methods are basically in agreement. Thus, the analysis can provide a reference for further study.

Influence of Filler Materials (Limestone Powder and Marble Powder) on the Flexural Strength of Self Compacting Concrete (SCC) Beams, Experimental and Analytical Approaches

Self-Compacting Concrete (SCC) is a highly-workable concrete which fills the formwork without any vibration or impact under its own weight, and it also passes easily through small spaces between rebars. In the present investigation, Self-compacting concrete is achieved by partially replacing cement (40%) using Fly Ash (FA), Silica Fume (SF), Limestone Powder (LP) and Marble Powder (MP) at different percentages by mass of cement. Experimental investigations were carried out for twenty beams to validate the analytical results. To carry out the analysis, totally twenty beams with different mix ID is built using comprehensive computer software ANSYS 14.5. The static nonlinear analysis is done to find out the maximum deflection of the beam. This study assimilate the analysis of RC rectangular beams subjected to two point loading using Non-linear Finite element method (ANSYS 14.5 software) and to validate it experimentally. Using ANSYS software, ultimate load, crack pattern and deflections were determined at span of the beam. The comparison between ANSYS results and experimental results were made in terms of deflection of concrete beams. From the analytical results, it is found that the mix containing 15% silica fume (15SF) is optimum. It is found that the results of the finite element analysis by ANSYS 14.5 package have a close agreement with the experimental results.

Hermitian Mindlin Plate Wavelet Finite Element Method for Load Identification

A new Hermitian Mindlin plate wavelet element is proposed. The two-dimensional Hermitian cubic spline interpolation wavelet is substituted into finite element functions to construct frequency response function (FRF). It uses a system’s FRF and response spectrums to calculate load spectrums and then derives loads in the time domain via the inverse fast Fourier transform. By simulating different excitation cases, Hermitian cubic spline wavelets on the interval (HCSWI) finite elements are used to reverse load identification in the Mindlin plate. The singular value decomposition (SVD) method is adopted to solve the ill-posed inverse problem. Compared with ANSYS results, HCSWI Mindlin plate element can accurately identify the applied load. Numerical results show that the algorithm of HCSWI Mindlin plate element is effective. The accuracy of HCSWI can be verified by comparing the FRF of HCSWI and ANSYS elements with the experiment data. The experiment proves that the load identification of HCSWI Mindlin plate is effective and precise by using the FRF and response spectrums to calculate the loads.

Effects of Welding Parameters on Temperature Distribution and Tensile Strength of AA6061-T6 Welded by Friction Stir Welding

The present research aims to study the effect of friction stir welding (FSW) parameters on temperature distribution and tensile strength of aluminum 6061-T6. Rotational and traverse speeds used were (500,1000,1400 rpm) and (14,40,112 mm/min) respectively. Results of mechanical tests showed that using 500rpm and 14mm/min speed give the best strength. A three- dimensional fully coupled thermal-stress finite element model via ANSYS software has been developed. The Rate dependent Johnson-Cook relation was utilized for elasto-plastic work deformations. Heat-transfer is formulated using a moving heat source, and later used the transient temperature outputs from the thermal analysis to determine equivalent stresses in the welded plates via a 3-D thermo- mechanical simulation. Motion due to rotation and translation of the tool induces asymmetry in the material flow and heating across the tool pin. The rotation speed results in stirring and mingling of material around the tool and the movable tool moves the stirred material from the front to the back of the tool and finishes welding process. Higher rotation speed rates create higher temperature because of higher friction heating and result in more powerful stirring and mingling of material. A good agreement is evident between experimental and Ansys results.
 

Displacement Measurement of Pylon using Image Processing Technique

This paper introduces a digital image processing(DIP) method as a method for measuring the displacement of pylon. The comparison of DIP results and ANSYS analysis results verified the validity of the image processing technique. Normalized cross-correlation(NCC) coefficient was used and experiments were performed three times. It shows that the displacement difference was 22% and 5% compared to ANSYS results. Therefore, the image processing method is expected to be able to measure the displacement of pylon sufficiently.

Comparison between Theoretical, Analytical & Experimental Vibration Analysis Method & Different Circular Tile Cutter by Using FFT&ANSYS

Circular cutters with uniform radial cracks are extensively used in the cutting processes. Unwanted noise, vibration & accidental failure associated with the cutting process have become an important economic and technological problem in the industry. The knowledge of natural frequencies of components is of great interest in the study of response of structures to various excitations. Hence, it is important to study a circular tile cutter with central hole, which fixed at inner edge and free at outer edge with its dynamic response. In this study some efforts are taken for analyzing vibration characteristics of tile cutter used in tile cutting industries with free boundary condition but having different (enlargement of stress concentration holes, slot end hole diameter ,numbers of cutting teeth’s, aspect ratio, effect of number and length of cracks, variable radial slit, circular concentric slit, thickness).Results From the FEA and FFT it is found that, this study is needful for design data preparation to avoid resonance and vibration in tile cutting industries from which finding out natural frequency and vibration w.r.t. different changes in tile cutter. Thus Theoretical, ANSYS & FFT results obtained are to be compared.

The stress analysis of a shear wall with matrix displacement method

Finite element method (FEM) is an effective quantitative method to solve complex engineering problems. The basic idea of FEM for a complex problem is to be able to find a solution by reducing the problem made simple. If mathematical tools are inadequate to obtain precise result, even approximate result, FEM is the only method that can be used for structural analyses. In FEM, the domain is divided into a large number of simple, small and interconnected sub-regions called finite elements. FEM has been used commonly for linear and nonlinear analyses of different types of structures to give us accurate results of plane stress and plane strain problems in civil engineering area. In this paper, FEM is used to investigate stress analysis of a shear wall which is subjected to concentrated loads and fundamental principles of stress analysis of the shear wall are presented by using matrix displacement method in this paper. This study is consisting of two parts. In the first part, the shear wall is discretized with constant strain triangular finite elements and stiffness matrix and load vector which is attained from external effects are calculated for each of finite elements using matrix displacement method. As to second part of the study, finite element analysis of the shear wall is made by ANSYS software program. Results obtained in the second part are presented with tables and graphics, also results of each part is compared with each other, so the performance of the matrix displacement method is demonstrated. The solutions obtained by using the proposed method show excellent agreements with the results of ANSYS. The results show that this method is effective and preferable for the stress analysis of shell structures. Further studies should be carried out to be able to prove the efficiency of the matrix displacement method on the solution of plane stress problems using different types of structures.

Analysis on Transverse Bending of Rectangular Plate

Transverse bending analysis of plates is an important investigation in structural engineering. A number of techniques has been used so far for these investigations. However Finite Element Method is by far the most popular one. In this paper a general first order shear deformation theory (FSDT) is used to analyze the bending behavior of isotropic plates having central cut-outs. A nine node isoparametric element is used. Plates having different aspect ratio (b/a), boundary conditions and different loads- uniformly distributed load and hydrostatic load are analyzed. Both thin (h/a=0.01) and thick (h/a=0.1) isotropic plates are studied. The deflection and bending moment in non-dimensional form are presented at different locations of the plate. Some of the present solutions are compared with those obtained using ANSYS. Numerical solutions obtained by the present formulation are within 1% of the exact solutions found in literature which not only validates the formulation but also has a clear advantage over ANSYS results (which are generally with 5%-10% of exact solutions). Some new results are provided for uniformly distributed load and hydrostatic load.

Analysis of Inhomogeneity of Internal Force in Front Wall of Caisson

Finite element procedure was used to build a spatial model of a perforated caisson, the result was compared with the one that was calculated according to the current standard. It is pointed out that simplifying assumption of the standard is different from the actual structure, the side walls can’t act as fixed constraints for the front wall. The calculated mid-span moment in the middle span is close to the ANSYS result, while that in the side span is much smaller than the ANSYS result. It is recommended that the result is multiplied by a expansion coefficient.

English

Gearing is one of the most critical components in a mechanical power transmission system, and in most industrial rotating machinery. Traditionally, gears are designed using AGMA (American Gear Manufacturers Association) or ISO (International Organization for Standardization) standards and followed by manufacturing. FEA has beena useful tool in recent days not only to validate design; it can also use to optimize design. The present work is aimedat analytical designof girth gear byusing AGMA standard. Bending & contact stresses on the gear teeth are calculated.The validation of thestresses is done by usingANSYSsoftware. The values of the bending stress and contact stress determined using AGMA found to be in agreement with ANSYS results and corresponding error observed is less than 5%.

An Analytical Model for Dynamic Pull-In of Electrostatic Perforated Plate Actuators

Pull-in parameters are important parameters of electrostatic actuators. This paper presents three analytical approximate models for calculating the dynamic pull-in voltage and pull-in position of a perforated plate, respectively. The effects of the fringing field are included in two models. The accuracy of the three present models is compared with ANSYS results. Simulation results show that the detailed capacitance model with fringe effect has good agreement with the FEM results.

STATIC ANALYSIS OF HELICAL COMPRESSION SPRING

A spring is a flexible element used to exert a force or a torque and, at the same time, to store the energy. The force can be a linear push or pull, or it can be radial, acting similarly to a rubber band around a roll of drawings. The spring which is considered in the paper is a part of automobile horn, where the horn is used for maintain safe distance and it is subjected to varying load . The spring is analyzed through analytical and finite element method to check the variation in the deformation value as well as maximum shear stress value. By the results of ANSYS it is observed that analytical results and finite element method results are within the acceptable range.

A BP-ANN Based Surrogate Modeling for Predicting Engineering Analysis of Forging Press

Engineering analysis and simulation are time-consuming, and often trapped to computational burden, such as analyzing forging press. We herein employ surrogate modeling to reduce such computation cost while keeping high precision. This paper use a BP neural networks to building the surrogate model (BPNN-SM for short), and predicting the analysis results of mechanical structures with this model. The predicting process include confining design variables, sampling, building finite element model with business software ANSYS, constructing surrogate model to replace the original model and finally predicting data with the new model. In such process, we build a back-propagation neural network, and train it with sampling data from ANSYS results. We tested our methods with a mechanical structure design of hydraulic forging press. The experimental results verified the surrogate modeling.

Nonlinear Analysis of Reinforced Concrete Beam by ANSYS

This paper mainly uses ANSYS, the finite element analysis software, to make nonlinear analysis of reinforced concrete beam. The model simulating the test process was established, the calculation results of ANSYS are compared with the experimental results. The comparison shows that ANSYS analysis results are similar to experimental results, which indicates ANSYS analysis software can be used to simulate the mechanical property of reinforced concrete structures.

A Bidirectional B-Spline QR Method for the Analysis of Reinforced Concrete Shear-Wall with Opening

In this paper, based on the bidirectional B-spline QR method (BB-sQRM), the mechanical properties of the shear-wall with opening were studied. The cubic B-spline function (CB-sF) was used to construct the basis function of the BB-sQRM for its good properties. The new computational scheme of the BB-sQRM for structural analysis was established with quadrilateral element. Numerical example was given to illustrate the validity of the proposed algorithm for the shear-wall with opening. The reliability of the proposed algorithm was verified by comparing with the results of ANSYS. The effects of the opening size on lateral displacement and stress of the shear-wall with opening were discussed. The numerical results show that, square hole and rectangular vertical hole are more conducive to bearing capacity of the shear-wall with opening.

A Bidirectional B-Spline QR Method for the Analysis of Reinforced Concrete Shear-Wall with Opening

In this paper, based on the bidirectional B-spline QR method (BB-sQRM), the mechanical properties of the shear-wall with opening were studied. The cubic B-spline function (CB-sF) was used to construct the basis function of the BB-sQRM for its good properties. The new computational scheme of the BB-sQRM for structural analysis was established with quadrilateral element. Numerical example was given to illustrate the validity of the proposed algorithm for the shear-wall with opening. The reliability of the proposed algorithm was verified by comparing with the results of ANSYS. The effects of the opening size on lateral displacement and stress of the shear-wall with opening were discussed. The numerical results show that, square hole and rectangular vertical hole are more conducive to bearing capacity of the shear-wall with opening.

Finite Element Analysis of Elliptical Chord

The work presents the Finite element study of the effect of elliptical chords on the static and dynamic strength of tubular T-joints using ANSYS. Two different geometry configurations of the T-joints have been used, namely Type-1 and Type-2. An elastic analysis has been considered. The Static loading conditions used are: axial load, compressive load, In-plane bending (IPB) and Out-plane bending (OPB). The natural frequencies analysis (dynamic loading condition) has also been carried out. The geometry configurations of the T-joints have been used, vertical tubes are called brace and horizontal tubes are called chords. The joint consists of brace joined perpendicular to the circular chord. In this case the ends of the chord are held fixed. The material used is mild steel. Using ANSYS, finite element modeling and analysis of T-joint has been done under the aforementioned loading cases. It is one of the most powerful methods in use but in many cases it is an expensive analysis especially due to elastic–plastic and creep problems. Usually, three dimensional solid elements or shell elements or the combination of two types of elements are used for generating the tubular joints mesh. In tubular joints, usually the fluid induced vibrations cause the joint to fail under resonance. Therefore the natural frequencies analysis is also an important issue here. Generally the empirical results are required as guide or comparison tool for finite element investigation. It is an effective way to obtain confidence in the results derived. Shell elements have been used to model the assembled geometry. Finite element ANSYS results have been validated with the LUSAS FEA and experimental results, that is within the experimentation error limit of ten percentage.

Optimization of a Novel Micro-Hotplate for Gas Sensor

A novel design of micro-hotplate is proposed for micro-structural gas sensor. The simulation results of ANSYS reveal that higher temperature and more uniform temperature distribution was achieved in the micro-hotplate when the thickness of SiO2, thickness of Si substrate, electrode width and electrode space were designed to be 100, 200, 20 and 230 μm, respectively. The new micro-hotplate is benefit for the improvement of sensor sensitivity.

A Novel Micro-Hotplate Designed for Micro-Gas Sensor

A original design of micro-hotplate is proposed for micro-structural gas sensor. The simulation results of ANSYS reveal that higher temperature and more uniform temperature distribution was achieved in the micro-hotplate when the thickness of SiO2, thickness of Si substrate, electrode width and electrode space were designed to be 100, 200, 20 and 250 μm, respectively. The new micro-hotplate is beneficial to improving the sensor sensitivity.

A study of moderately thick quadrilateral plate elements based on the absolute nodal coordinate formulation

Finite element analysis using plate elements based on the absolute nodal coordinate formulation (ANCF) can predict the behaviors of moderately thick plates subject to large deformation. However, the formulation is subject to numerical locking, which compromises results. This study was designed to investigate and develop techniques to prevent or mitigate numerical locking phenomena. Three different ANCF plate element types were examined. The first is the original fully parameterized quadrilateral ANCF plate element. The second is an update to this element that linearly interpolates transverse shear strains to overcome slow convergence due to transverse shear locking. Finally, the third is based on a new higher order ANCF plate element that is being introduced here. The higher order plate element makes it possible to describe a higher than first-order transverse displacement field to prevent Poisson thickness locking. The term “higher order” is used, because some nodal coordinates of the new plate element are defined by higher order derivatives. The performance of each plate element type was tested by (1) solving a comprehensive set of small deformation static problems, (2) carrying out eigenfrequency analyses, and (3) analyzing a typical dynamic scenario. The numerical calculations were made using MATLAB. The results of the static and eigenfrequency analyses were benchmarked to reference solutions provided by the commercially available finite element software ANSYS. The results show that shear locking is strongly dependent on material thickness. Poisson thickness locking is independent of thickness, but strongly depends on the Poisson effect. Poisson thickness locking becomes a problem for both of the fully parameterized element types implemented with full 3-D elasticity. Their converged results differ by about 18 % from the ANSYS results. Corresponding results for the new higher order ANCF plate element agree with the benchmark. ANCF plate elements can describe the trapezoidal mode; therefore, they do not suffer from Poisson locking, a reported problem for fully parameterized ANCF beam elements. For cases with shear deformation loading, shear locking slows solution convergence for models based on either the original fully parameterized plate element or the newly introduced higher order plate element.