scholarly journals METHODS FOR REDUCING THE STRESS CONCENTRATION IN CYLINDRICAL SPECIMENS, AT AXIAL LOADING

2021 ◽  
Vol 3 ◽  
pp. 300-303
Author(s):  
Raycho Raychev ◽  
Ivanka Delova
Keyword(s):  
Stress Concentration ◽  
Fatigue Limit ◽  
Axial Loading ◽  
Geometric Parameters ◽  
Graphical Form ◽  
Ansys Software ◽  
Specialized Software ◽  
Different Shapes ◽  
Reducing Stress ◽  
Cylindrical Test

The article presents specialized software methods for reducing stress concentration. Objects of study are cylindrical test specimens subjected to axial loading. Notching with different shapes and sizes on the specimens were formed to reduce the stresses in the endangered areas. The geometric parameters of notches identified through the specialized built-in modules to the ANSYS software. An analysis performed were to show the influence of stresses acting on the fatigue limit during different cycles. The results of the study were present in a graphical form. 

scholarly journals REDUCTION OF THE STRESS CONCENTRATION FACTOR OF PRISMATIC SPECIMENS THROUGH THE USE OF TOPOLOGICAL OPTIMIZATION

2021 ◽  
Vol 3 ◽  
pp. 296-299
Author(s):  
Raycho Raychev ◽  
Ivanka Delova
Keyword(s):  
Stress Concentration ◽  
Objective Function ◽  
Fatigue Limit ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Axial Loading ◽  
Topological Optimization ◽  
Graphical Form ◽  
Ansys Software ◽  
Prismatic Specimen

The article presents studies related to the reduction of stress concentration acting on prismatic specimen subject to axial loading. Using ANSYS software, a topological optimization was performed which aims to reduce the stresses in the endangered areas. The aim of identification of the geometric parameters accomplished after the completion of topological optimization of the objective function is to minimize the stresses in the engaged areas. An analysis performed were to show the influence of stresses acting on the fatigue limit during different cycles. The results of the study were present in a graphical form. 

Advancements in Micro-Structure with Multiple Stress Concentration Region for Bionic Vector Hydrophone

2015 ◽  
Vol 645-646 ◽  
pp. 555-560
Author(s):  
Guo Jun Zhang ◽  
Peng Zhao ◽  
Wen Dong Zhang
Keyword(s):  
Stress Concentration ◽  
Constant Force ◽  
Ansys Software ◽  
Micro Structure ◽  
Concentration Region ◽  
Multiple Stress ◽  
Upper Limit ◽  
Stress Concentration Region ◽  
Vector Hydrophone ◽  
Different Shapes

The method of Multiple Stress Concentration Regions (MSCRs) on the surface of MEMS Silicon micro-structure is introduced in order to enhance the sensibility of the hair vector hydrophone without reducing the working bandwidth. The MSCRs with the thickness and width smaller than the rest of the cantilever can produce localized stress concentration when constant force is applied on the structure. ANSYS software has been used as a tool to analyze the effect of different shapes and dimensions on the performance of the micro-structure. The optimum MSCR has been obtained. Results show that compared with the ordinary structure, the sensitivity of the micro-structure with MSCR can be increased by 1.5 times, and the upper limit of bandwidth can be improved from 337Hz to 500Hz. This paper provides a new method to resolve contradiction between the sensitivity and working bandwidth.

The Parametrical Stress Analysis of Tubular T Joints

1985 ◽  
Vol 107 (4) ◽  
pp. 473-478
Author(s):  
T.-Y. Chen ◽  
B.-Z. Chen ◽  
Y.-Q. Wang
Keyword(s):  
Experimental Data ◽  
Stress Concentration ◽  
Stress Analysis ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Axial Loading ◽  
Geometric Parameters ◽  
T Joints ◽  
Data Tables ◽  
The Relationship

The relationship between the geometric parameters of α, β, γ and τ of tubular T joints and chord stress concentration factor, SCF, has been investigated. With the use of calculated values as well as experimental data tables were compiled for a wide variety of cases when axial loading on the branch is applied. Finally, a probability analysis is given as to the reliability of using a particular SCF value.

scholarly journals Numerical Simulation of Pelton Turbine Nozzle for Different Shapes of Spear

2011 ◽  
Vol 8 (1) ◽  
pp. 53-63
Author(s):  
Abhishek Sharma ◽  
Vishnu Prashad ◽  
Anil Kumar
Keyword(s):  
High Speed ◽  
Flow Analysis ◽  
Graphical Form ◽  
Ansys Software ◽  
Pelton Turbine ◽  
Ansys Cfx ◽  
Computational Fluid Dynamics Analysis ◽  
Geometry Configuration ◽  
Mass Flow Rates ◽  
Different Shapes

This Paper Present a simulation for design of spear for nozzle by applying computational fluid dynamics analysis and using ANSYS software. With the development of high speed computers and advancement in numerical techniques detail flow analysis of the desired model can be done for design optimization. The design can be altered till the best performance or desired output is obtained. This is less time consuming. CFD can provide the solution for different operating condition and geometry configuration in less time and cost and found very useful for design and development. In the present work, three shapes of spear at different mass flow rates have been analysed using ANSYS-CFX 10 software, the pressure and velocity distribution are obtained and compared. Using the analysis result, the loss variations with the nozzles for different spear shapes are computed. The results are presented in tabular and graphical form.

Design Nomographs of Compression Helical Springs for Predetermined Reliability Levels

1981 ◽  
Vol 103 (2) ◽  
pp. 268-273
Author(s):  
My Dao Thien ◽  
M. Massoud
Keyword(s):  
Probabilistic Approach ◽  
Design Procedure ◽  
Axial Loading ◽  
Geometric Parameters ◽  
Computer Algorithms ◽  
Mean Values ◽  
Helical Springs ◽  
Reliability Level ◽  
Classical Design ◽  
Mission Success

This paper discusses a probabilistic approach for the design of Compression Closely Coiled Helical Springs subjected to periodic axial loading. The classical design procedure results in deterministic geometric parameters with tolerances normally chosen according to standards without due regard to their effects on the mission success as normally expressed by a reliability level. With the proposed design procedure, the engineer can specify nominal mean values for the geometric parameters and their tolerances according to a predetermined reliability level. Design nomographs are presented to help the engineer, in the early stages of design, to choose between many alternatives. Computer algorithms can easily be written to verify the final or optimum design.

scholarly journals Modeling of Size Effects in Bending of Perforated Cosserat Plates

2017 ◽  
Vol 2017 ◽  
pp. 1-19 ◽  
Author(s):  
Roman Kvasov ◽  
Lev Steinberg
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Numerical Study ◽  
The Finite Element Method ◽  
Classical Elasticity ◽  
Element Analysis ◽  
Plate Deformation ◽  
The Finite Element Analysis ◽  
Circular Holes ◽  
Different Shapes

This paper presents the numerical study of Cosserat elastic plate deformation based on the parametric theory of Cosserat plates, recently developed by the authors. The numerical results are obtained using the Finite Element Method used to solve the parametric system of 9 kinematic equations. We discuss the existence and uniqueness of the weak solution and the convergence of the proposed FEM. The Finite Element analysis of clamped Cosserat plates of different shapes under different loads is provided. We present the numerical validation of the proposed FEM by estimating the order of convergence, when comparing the main kinematic variables with an analytical solution. We also consider the numerical analysis of plates with circular holes. We show that the stress concentration factor around the hole is less than the classical value, and smaller holes exhibit less stress concentration as would be expected on the basis of the classical elasticity.

Stress Analysis of the Skewed-Roller Slipping Clutch Based on Frictional Contact and Dynamic Equilibrium

2011 ◽  
Vol 86 ◽  
pp. 850-853 ◽  
Author(s):  
Ming Feng ◽  
Guang Rong Yan
Keyword(s):  
Stress Concentration ◽  
Frictional Contact ◽  
Power Transmission ◽  
Dynamic Equilibrium ◽  
Von Mises Stress ◽  
Relative Rotation ◽  
Profile Modification ◽  
Roller Profile ◽  
Von Mises ◽  
Reducing Stress

As a novel power transmission component, the skewed–roller slipping clutch (SRSC) produces resisting torque depending on relative rotation and sliding between askew arranged cylindrical rollers and specially curved races. In this paper, the surface contact stress and von Mises stress between the rollers and the races are calculated and the effects of roller profile modification on reducing stress concentration are investigated under frictional contact and dynamic equilibrium of the rollers and races.

The Use of Stress Reduces in suddenly Changed Section of Rounded Shafts

2011 ◽  
Vol 147 ◽  
pp. 9-13
Author(s):  
S.R. Mohebpour ◽  
Mohammad Vaghefi
Keyword(s):  
Stress Concentration ◽  
Numerical Optimization ◽  
Optimization Approach ◽  
Geometrical Shape ◽  
New Concepts ◽  
Concentration Factors ◽  
Geometrical Change ◽  
Stress Concentration Factors ◽  
Reducing Stress ◽  
Dangerous Section

Reducing stress concentration is mainly done by fillets. However, new concepts toward better material properties lead designers and engineers to use these materials in their design, still changing in geometrical shape of desired models can help us in reducing stress concentration factors. New devices, including fast computers, reliable numerical methods (FEM), and numerical optimization approach can bring special devices for better designing besides considering design limitations in special industries. In this paper we focus on geometrical change (rounded groove) in the sudden changed section of the rounded shaft to reduce stress concentration in the most dangerous section. By optimizing this proposed change in the geometry of shaft we reduce the stress, so using of fillets can be neglected in the future designs to prevent metallurgical and design limitations.

AN INVESTIGATION OF EIGENVALUES OF SHEET METAL UNDERGOING BENDING STRESSES

2015 ◽  
Vol 76 (8) ◽  
Author(s):  
Wan Sulaiman Wan Mohamad ◽  
Ahmad Azlan Mat Isa ◽  
Ahmad Syahmi Abu Talib
Keyword(s):  
Natural Frequencies ◽  
Dynamic Properties ◽  
Modal Parameters ◽  
Structural Members ◽  
Sheet Metals ◽  
Ansys Software ◽  
Bending Stresses ◽  
Different Shapes ◽  
Bent Plates

Accurate prediction of dynamic properties of system is important to ensure the dynamic based design integrity of its member is not compromise. It will reduce or possibly eliminate the possibilities of further modifications in-situ of real system. On this account, this study investigates the modal parameters of the pre-stress sheet metals undergoing bending stresses which is commonly used in practice as structural members. In addressing this issue, three different shapes of sheet metals of similar thickness were studied i.e. straight plate, U-shaped and V-shaped plates. The natural frequencies of these configurations were determined experimentally using the Operational Modal Analysis (OMA). Numerical values were obtained using ANSYS software. Results of these shapes acquired experimentally and numerically were then compared and analyzed. Significant reduction in the eigenvalues of is observed on bent plates both experimentally and numerically as compared to flat plate.

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