Improvement on Straightness of Micro-Motor Shaft Considering Stress Concentration Caused by the Grooves

2019 ◽  
Author(s):  
Zexing Guo ◽  
Hong Lu ◽  
Jinglin Zhang ◽  
Yue Zang ◽  
Weixin Zhang ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Experimental Research ◽  
Manufacturing Process ◽  
Motor Performance ◽  
Initial Deflection ◽  
Motor Shaft ◽  
Circular Shaft ◽  
Stress And Deformation ◽  
Deformation Models

Abstract Motor shaft is one of the most important parts of motor, which is widely used in industrial field. The straightness of the shaft has a potentially significant effect on motor performance, which is determined by the straightening process in the manufacturing process of the shaft. Considering the grooved characteristics on the micro-motor shaft and using the classical material mechanics principle, the stress and deformation models of the circular shaft with the grooves during the straightening process are established in this paper. By deriving the straighttening stroke-initial deflection model, an accurate and practical relationship between the straightening stroke and the initial deflection was provided. In order to verify the theoretical straightening model, some grooved shaft specimens are designed and manufactured for the straightening experiments. Through the simulation and experimental research, the straightening stroke-initial deflection model for the micro-motor shaft is compared and analyzed, and the correctness and feasibility of the model is verified.

The Stress Analysis and Experimental Research of Tubular K-Joints With Overlap

1987 ◽  
Vol 109 (4) ◽  
pp. 375-380
Author(s):  
Tie-yun Chen ◽  
Wei-min Chen
Keyword(s):  
Experimental Data ◽  
Stress Concentration ◽  
Variational Method ◽  
Stress Analysis ◽  
Experimental Research ◽  
Hot Spot ◽  
Intersection Point ◽  
Tubular Joints ◽  
Photoelastic Experiment ◽  
Intersection Curves

The geometry of overlapping tubular joints, the equations of intersection curves and the coordinate of the intersection point are introduced first. The variational method for simple tubular joints is extended to the stress analysis of tubular K-joints with overlap. The computer program is compiled. The stress concentration factor and the position of the hot spot of an overlapping joint are found. For the sake of proving the feasibility of our analysis and program, the computed results are compared with experimental data of our photoelastic experiment and other experiments.

Experimental Research of Process Parameters in Metal Droplet Deposition Manufacturing

2010 ◽  
Vol 97-101 ◽  
pp. 4028-4031 ◽  
Author(s):  
Yan Pu Chao ◽  
Le Hua Qi ◽  
Xiang Hui Zeng ◽  
Jun Luo ◽  
Hua Huang
Keyword(s):  
Layer Thickness ◽  
Experimental Research ◽  
Process Parameters ◽  
Manufacturing Process ◽  
Droplet Diameter ◽  
Metal Droplet ◽  
Experimental System ◽  
Droplet Deposition ◽  
High Quality ◽  
Experimental Parameters

In the droplet-based manufacturing process, the accuracy and density of forming parts are determined by experimental parameters such as the velocity and temperature of substrate, droplets spraying frequency, line deposition space and layer thickness etc. Using Sn60-Pb40, the droplets deposition experiment was conducted to investigate the effect of the parameters on the accuracy and density of formed lines, layers and solids on the experimental system. The experiment results showed that the high quality lines were obtained when the overlapping ratio of the adjacent droplets was controlled around 30% by the substrate velocity and droplet spraying frequency, meanwhile，the temperatures of the substrate and droplet were maintained at 270°C and 140°C, respectively. When the lines deposited space was about 90% of droplet diameter and the layer thickness was about 80% of droplet diameter, good deposition results of layers and solids can be obtained. This work has offered experimental guide for metal droplet deposition manufacturing.

scholarly journals Dynamic Characteristic Analysis of Vibration Screen Based on Joint Face Analysis

2021 ◽  
Vol 2085 (1) ◽  
pp. 012013
Author(s):  
Zhiheng Nie
Keyword(s):  
Stress Concentration ◽  
Industrial Production ◽  
Large Scale ◽  
Nonlinear Problems ◽  
Joint Surface ◽  
Characteristic Analysis ◽  
Face Analysis ◽  
Vibrating Screen ◽  
Linear Problems ◽  
Stress And Deformation

Abstract Vibrating screens play an important role in industrial production. While the cross beam fracture is the main reason for the shutdown of the screen. In order to solve the problem of fatigue fracture of the beam of the large-scale vibrating screen, the 3.6x7.3 m banana vibrating screen was taken as the research object, and the joint surface analysis was introduced at the joint surface of each part of the beam to simulate the stiffness and stress concentration of the joint surface, so that the nonlinear problems will be transformed into linear problems, and the stress and deformation of the connection area are correctly simulated, thereby this project has given an accurate basis for further optimization and optimizing the structure.

Life Cycle Assessment of Timber Formwork: Case Study

2014 ◽  
Vol 1001 ◽  
pp. 155-161
Author(s):  
L'uboš Krišták ◽  
Rastislav Igaz ◽  
Dušan Brozman ◽  
Roman Réh ◽  
Petra Šiagiová ◽  
...  
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Experimental Model ◽  
Technological Process ◽  
Experimental Research ◽  
Manufacturing Process ◽  
Energy Savings

The article deas with evaluation of the selected parts of a life cycle of timber formwork on a wooden basis, notably in the field of manufacturing and usage. Experimental research focused mainly on assessing the possibilities of energy savings in a manufacturing process through shortening a technological process of moulding. By optimalisation of a moulding period, it is possible to achieve considerable energy savings. Based upon the experiments, we created an experimental model in order to determine optimum moulding time. Withing a process of usage, we evaluated particular materials with regard to re-use cycle based upon the experience of commercial manufacturers.

Numerical Simulation and Analysis of Tapered Interference Fit of Atomizer Disk

2012 ◽  
Vol 201-202 ◽  
pp. 170-174
Author(s):  
Shun Hong Lin ◽  
Chang Jiang Li ◽  
Jian Ping Ding ◽  
Dai Chuan Chen
Keyword(s):  
Numerical Simulation ◽  
Stress Concentration ◽  
Stress Distribution ◽  
High Speed ◽  
Engineering Application ◽  
Axial Direction ◽  
Analysis Model ◽  
Distribution Law ◽  
Interference Fit ◽  
Stress And Deformation

The contact analysis model of high speed centrifugal atomizer is created and stress distribution law is obtained by using ANSYS FEM software in this paper. The stress distribution along the axial direction is uneven, the stress of the small end of the taper is large and the stress concentration appears on both ends of the taper. In addition, the factors which influence the interference fit stress are researched and discussed. The interference fit stress is mainly influenced by the shrink range, while the influence from the friction coefficient is very weak. Comparing with the conventional design, the position and value of the stress and deformation of the parts can be known exactly and thoroughly by using the approach proposed in this paper. The method provides a very valuable reference to designing the best shrink range for engineering application.

A Photoelastic-Fatigue Programme of Experimental Research in Connection with Bolted Joints

1954 ◽  
Vol 58 (522) ◽  
pp. 435-438 ◽  
Author(s):  
E. W. C. Wilkins ◽  
H. T. Jessop
Keyword(s):  
Fatigue Strength ◽  
Stress Concentration ◽  
Experimental Research ◽  
Bolted Joints ◽  
Supply Contract ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Parallel Series

An outline is given of a combined photoelastic and fatigue programme of work on single-pin double-strap joints; the stress concentration factors obtained from photoelastic tests are to be correlated with the results from a parallel series of metal fatiguetests on geometrically similar specimens. The form and dimensions for a photoelastic specimen suitable for this work are given. Further results will be published as the work proceeds. This Note outlines a programme of work recently initiated by the Royal Aeronautical Society, and now being done under Ministry of Supply contract, in connection with the fatigue strength of bolted joints.

scholarly journals FEM analysis of 3D lattice structures of ABS material

2021 ◽  
Vol 12 (6) ◽  
pp. 648-652
Author(s):  
Seong-Gyu Cho Et.al
Keyword(s):  
Mechanical Properties ◽  
Stress Concentration ◽  
Lattice Structure ◽  
Three Dimensional ◽  
Parametric Modeling ◽  
Lattice Structures ◽  
Filling Rate ◽  
Dimensional Lattice ◽  
Stress And Deformation ◽  
Fcc Structure

FDM is a typical additive manufacturing method. Since FDM is a method of stacking layers one by one, it generally has a flat lattice structure. In this study, by checking the distribution of stress and deformation for several lattice structures made of ABS material, it is intended to find a structure with better mechanical properties with less material. Several three-dimensional lattice structures are modeled using parametric modeling. Subsequently, a constant pressure is applied to the same area to check the stress and strain distribution. A structure with a low maximum stress value in the stress concentration region and a small amount of deformation will have the best mechanical properties. To do this, parametric modeling is performed using Inventor to model four three-dimensional lattice structures. Afterwards, use Ansys Workbench to check the stress and deformation distribution. Looking at the stress distribution, stress concentration occurred in the truss supporting the upper surface of the SC structure. In the BCC and PTC structures, stress concentration occurred at the point where the upper surface and the truss met. In the FCC structure, it can be seen that the load is distributed throughout the truss structure. Looking at the deformation distribution, both the SC and BCC structures show similar amounts of deformation. It was confirmed that the FCC structure had less maximum deformation than the PTC structure with the thickest truss. Unlike previous studies, it was confirmed that the higher the internal filling rate, the better the mechanical properties may not come out. The FDM method can obtain different mechanical properties depending on the internal lattice structure as well as the internal filling rate. In a later study, we will find a new calculation algorithm that applies variables by FDM characteristics using the data obtained by printing the actual specimen.

Enhanced Lifetime for Internal Pressure Fatigue of DSAW Pipes

2004 ◽  
Author(s):  
Oskar Reepmeyer ◽  
Andreas Liessem ◽  
Marion Erdelen-Peppler ◽  
Gerhard Knauf
Keyword(s):  
Stress Concentration ◽  
Internal Pressure ◽  
Efficient Method ◽  
Manufacturing Process ◽  
Design Codes ◽  
Test Program ◽  
Seamless Pipe ◽  
Compressed Natural Gas ◽  
Cost Efficient ◽  
The Cost

Pipes are used as construction elements, to transport liquids and gas in pipelines and as storage containment’s for gas and liquids. A very cost efficient method to fabricate larger diameter pipes with heavier wall thickness is the DSAW process. In many applications in the above listed fields the pipes are exposed to fatigue loads. Several design codes and standards exist which consider SAW pipes for the different applications. Depending on the loading conditions the stress concentration resulting from the weld of the DSAW pipe but also from the connecting welds in the structure leads to a significant reduction in lifetime. This reduction is accounted in the different design codes. To utilize the cost efficient DSAW pipe also for applications which so far could economically only be served by seamless pipes a method was developed to reduce the stress concentration in the area of the long seam. This method provides pipes with a lifetime similar to a seamless pipe by still maintaining the competitiveness of the DSAW manufacturing process. A test program to qualify this method for Cargo Tank Cylinders for Compressed Natural Gas Transportation on vessels was accomplished in order to proof that the measures taken are effective.

The Stress Analysis and Experimental Research of Tubular Joints of Offshore Drilling Platform

1984 ◽  
Vol 106 (1) ◽  
pp. 43-45
Author(s):  
T. Y. Chen ◽  
B. Z. Chen ◽  
Y. Q. Wang
Keyword(s):  
Stress Concentration ◽  
Stress Distribution ◽  
Stress Analysis ◽  
Experimental Research ◽  
Stress Concentration Factor ◽  
Analytical Method ◽  
Concentration Factor ◽  
Offshore Drilling ◽  
Tubular Joints ◽  
Good Agreement

An analytical method for the stress analysis of tubular joints of T, Y, K type is presented in this paper. The stress distribution and stress concentration factor of the joints are calculated. Numerical results are in good agreement with the experimental results.

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