CCD automated polariscope system and the stress analysis methods

1994 ◽  
Vol 15 (4) ◽  
pp. 361-366
Author(s):  
An Li-qian
Keyword(s):  
Stress Analysis ◽  
Analysis Methods

Comparative study of stress analysis of gears with different helix angle using the ISO 6336 standard and tooth contact analysis methods

2016 ◽  
Vol 230 (7-8) ◽  
pp. 1350-1358 ◽  
Author(s):  
Layue Zhao ◽  
Robert C Frazer ◽  
Brian Shaw
Keyword(s):  
Stress Analysis ◽  
Contact Stress ◽  
Helix Angle ◽  
Contact Analysis ◽  
Bending Stress ◽  
Contact Ratio ◽  
Tooth Contact Analysis ◽  
Tooth Contact ◽  
Iso Standard ◽  
Analysis Methods

With increasing demand for high speed and high power density gear applications, the need to optimise gears for minimum stress, noise and vibration becomes increasingly important. ISO 6336 contact and bending stress analysis are used to determine the surface load capacity and tooth bending strength but dates back to 1956 and although it is constantly being updated, a review of its performance is sensible. Methods to optimise gear performance include the selection of helix angle and tooth depth to optimise overlap ratio and transverse contact ratio and thus the performance of ISO 6336 and tooth contact analysis methods requires confirmation. This paper reviews the contact and bending stress predicted with four involute gear geometries and proposes recommendations for stress calculations, including a modification to contact ratio factor Zɛ which is used to predict contact stress and revisions to form factor YF and helix angle factor Yβ which are cited to evaluate bending stress. The results suggest that there are some significant deviations in predicted bending and contact stress values between proposal methods and original ISO standard. However, before the ISO standard is changed, the paper recommends that allowable stress numbers published in ISO 6336-5 are reviewed because the mechanisms that initiate bending and contact fatigue have also changed and these require updating.

Analyzing Effects of Soil Parameters on Buried Pipe Behavior and Deciding Governing Parameter Using Statistical Approach

2015 ◽  
Author(s):  
Gaurav P. Bhende ◽  
Pallavi B. Kulkarni ◽  
Priyanka M. Kale
Keyword(s):  
Stress Analysis ◽  
Friction Angle ◽  
Soil Survey ◽  
Soil Parameters ◽  
Buried Pipe ◽  
Governing Parameter ◽  
Active Length ◽  
Soil Parameter ◽  
Future Design ◽  
Analysis Methods

One of the most common and practical difficulties a pipeline engineer faces at the initial stage of the project is the lack of Soil survey data. Hence, various soil parameters like soil type, density, friction angle, cohesive pressure, depth of cover, pipe coating etc. are needed to be assumed. The critical designs like anchor block requirement, pipe route changes, support loads which involve a huge cost are required to be ‘Issued for Construction’ based on assumed data. This paper briefly illustrates and compares the results obtained from the two most common buried pipe stress analysis methods viz. ‘American Lifeline Alliance - Appendix B’ (1) and ‘Stress Analysis Methods for Underground Pipelines’ (2) and shows their effects graphically on the various Stress Analysis results like pipe movement, end force, active length (virtual anchor length) and bending stress generated in the buried pipeline. Further, this paper comes up with an unique application of ANOVA, a Statistical method, to find out the most significant soil parameter affecting the said results. The paper explains this method with a solved example. These results are useful for a pipeline engineer to determine the governing soil parameter in the design and thus provide a useful tool to make optimum assumptions in absence of soil data so as to minimize the changes in future design and helps saving the cost of the project due to rework.

Residual Stress Study in Dissimilar Metal Welds of a PWR Pressurizer Surge Nozzle: Validation of Developed Fast Analysis Method and Examination of Safe-End Length Effect

2013 ◽  
Author(s):  
Akira Maekawa ◽  
Atsushi Kawahara ◽  
Hisashi Serizawa ◽  
Hidekazu Murakawa
Keyword(s):  
Residual Stress ◽  
Stress Analysis ◽  
Round Robin ◽  
Simulation Code ◽  
Fast Analysis ◽  
Pressurized Water ◽  
Dissimilar Metal ◽  
Analysis Methods ◽  
Weld Residual Stress ◽  
Residual Stress Analysis

It is necessary to establish properly reliable weld residual stress analysis methods for accurate crack initiation and growth assessment of primary water stress corrosion cracking, which may occur in nickel-based dissimilar metal welds in pressurized water reactors. The US Nuclear Regulatory Commission and the Electric Power Research Institute cooperatively conducted an international round robin for weld residual stress analysis to improve stress analysis methods and to examine the uncertainties involved in the calculated stress values. In this paper, the results from the authors’ participation in the round robin were reported. In the round robin, the weld residual stress in a nickel-based dissimilar metal weld of a pressurizer surge nozzle mock-up was computed under various analysis conditions. The residual stress analysis results computed by a welding simulation code currently being developed that uses the iterative substructure method were in good agreement with the measurements. Also, the effect of safe-end length on residual stress distribution was examined as an additional discussion point.

Composite Material Pressure Vessel Design Research

2011 ◽  
Vol 321 ◽  
pp. 218-221
Author(s):  
Huan Xin Cheng
Keyword(s):  
Composite Material ◽  
Stress Analysis ◽  
Reference Values ◽  
Pressure Vessel ◽  
Design Research ◽  
Analysis Methods ◽  
Material Characteristics ◽  
Design Techniques

Some composite material characteristics are summarized and main advantages of composite material are analyzed in the paper. In addition, stress analysis methods, failure rules and design techniques of a pressure vessel are also recommended. Finally, the importance of composite material has been summed up . The paper has some reference values to investigation of a composite material pressure vessel.

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