Influence of fit tolerance between square tenon thickness and oval mortise width on ultimate pulling resistance

2014 ◽  
pp. 191-196
Keyword(s):  
Fit Tolerance ◽  
Pulling Resistance

Effect of design parameters on stresses occurring at the tooth root in a spur gear pressed on a shaft

2021 ◽  
pp. 095440892199529
Author(s):  
Fatih Güven
Keyword(s):  
Internal Pressure ◽  
Tangential Stress ◽  
Spur Gear ◽  
Design Parameters ◽  
Interference Fit ◽  
Gear Design ◽  
Compact Design ◽  
Fit Tolerance ◽  
Moderate Stress ◽  
Good Agreement

Gears are commonly used in transmission systems to adjust velocity and torque. An integral gear or an interference fit could be used in a gearbox. Integral gears are mostly preferred as driving gear for a compact design to reduce the weight of the system. Interference fit makes the replacement of damaged gear possible and re-use of the shaft compared to the integral shaft. However, internal pressure occurs between mating surfaces of the components mated. This internal pressure affects the stress distribution at the root and bottom land of the gear. In this case, gear parameters should be re-considered to assure gear life while reducing the size of the gear. In this study, interference fitted gear-shaft assembly was examined numerically. The effects of rim thickness, profile shifting, module and fit tolerance on bending stress occurring at the root of the gear were investigated to optimize gear design parameters. Finite element models were in good agreement with analytical solutions. Results showed that the rim thickness of the gear is the main parameter in terms of tangential stress occurring at the bottom land of the gear. Positive profile shifting reduces the tangential stress while the pitch diameter of the gear remains constant. Also, lower tolerance class could be selected to moderate stress for small rim thickness.

Elastoplastic Frictional Contact Study on Interference Fits of Compressor

2011 ◽  
Vol 211-212 ◽  
pp. 535-539
Author(s):  
Ai Hua Liao
Keyword(s):  
Stress Distribution ◽  
Contact Stress ◽  
Frictional Contact ◽  
Contact Problems ◽  
Boundary Problems ◽  
Interference Fit ◽  
Parametric Variational Principle ◽  
Design And Manufacturing ◽  
Contact Stress Distribution ◽  
Fit Tolerance

The impeller mounted onto the compressor shaft assembly via interference fit is one of the key components of a centrifugal compressor stage. A suitable fit tolerance needs to be considered in the structural design. A locomotive-type turbocharger compressor with 24 blades under combined centrifugal and interference-fit loading was considered in the numerical analysis. The FE parametric quadratic programming (PQP) method which was developed based on the parametric variational principle (PVP) was used for the analysis of stress distribution of 3D elastoplastic frictional contact of impeller-shaft sleeve-shaft. The solution of elastoplastic frictional contact problems belongs to the unspecified boundary problems where the interaction between two kinds of nonlinearities should occur. The effect of fit tolerance, rotational speed and the contact stress distribution on the contact stress was discussed in detail in the numerical computation. The study play a referenced role in deciding the proper fit tolerance and improving design and manufacturing technology of compressor impellers.

Study on the critical loosening condition toward a new design guideline for bolted joints

2018 ◽  
Vol 233 (9) ◽  
pp. 3302-3316 ◽  
Author(s):  
Hao Gong ◽  
Jianhua Liu ◽  
Xiaoyu Ding
Keyword(s):  
Three Dimensional ◽  
Element Model ◽  
Simulation Method ◽  
Bolted Joints ◽  
Design Guideline ◽  
Factors Affecting ◽  
Dimensional Finite Element ◽  
Frictional Coefficients ◽  
Three Dimensional Finite Element ◽  
Fit Tolerance

An understanding of conditions that trigger the loosening of bolted joints is essential to ensure joint reliability. In this study, a three-dimensional finite element model of a typical bolted joint is developed, and a new simulation method is proposed to quantitatively identify the critical transverse force for initiating loosening. This force is used to evaluate the anti-loosening capacity of bolted joints. Using the proposed simulation method, the effects of factors affecting critical loosening are systematically studied. It is found that the preload, frictional coefficients at the thread and the bearing surfaces, clamped length, and fit tolerance mainly affected loosening. When the preload and friction coefficients are increased, and the clamped length and fit tolerance are reduced, loosening is inhibited. Experiments are performed to demonstrate the reliability of the results. Finally, a suggestion is proposed to improve the design guideline VDI 2230 for bolted joints, which considers the requirement of avoiding loosening under vibrational loading.

Influence of Deep Root Density on Root Pulling Resistance in Rice 1

Crop Science ◽  
1986 ◽  
Vol 26 (6) ◽  
pp. 1181-1186 ◽  
Author(s):  
I. J. Ekanayake ◽  
D. P. Garrity ◽  
J. C. O'Toole
Keyword(s):  
Root Density ◽  
Deep Root ◽  
Pulling Resistance

Study on Machine Vision Orientation of Incremental Sheet Forming Process

2011 ◽  
Vol 474-476 ◽  
pp. 371-375
Author(s):  
Fei Han ◽  
Zhi Qiang Ma ◽  
Jian Hua Mo ◽  
Meng Hu
Keyword(s):  
Machine Vision ◽  
Coordinate System ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Least Square ◽  
New Method ◽  
Forming Process ◽  
Image Capture ◽  
The Relationship ◽  
Fit Tolerance

In incremental sheet forming process, the bolster model usually applies guide pin to position. However, it is inefficient and rough due to the bolster model floating and fit tolerance between guide pin and aligning hole. This paper introduces a new method to position the bolster model. The image capture system captured the aligning holes images, and then processed it. The trajectory orientation system, which was based on machine vision, applied the least square principle to determine the parameters of aligning holes and obtain the coordinate system of bolster model. The camera calibration software, which was developed by Vision C++6.0, obtained the relationship between machine tool coordinate system and bolster model coordinate system. Then, CNC system transformed the machine coordinates offline, which enabled the forming trajectory coordinates to match bolster model coordinates automatically. Additionally, the forming process of automobile door is presented, which applied the new method, the result demonstrates that non-touch position method is more rapid and more accurate.

Genetic analysis of vertical root pulling resistance (VRPR) in maize using two genetic populations

2010 ◽  
Vol 28 (4) ◽  
pp. 463-474 ◽  
Author(s):  
Jianchao Liu ◽  
Hongguang Cai ◽  
Qun Chu ◽  
Xiaohui Chen ◽  
Fanjun Chen ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Pulling Resistance
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