Fatigue Life Analysis of Large-Scale Liner Vibration Screener Based on ANSYS

2010 ◽  
Vol 37-38 ◽  
pp. 466-470 ◽  
Author(s):  
Yong Yan Wang ◽  
Xin Hua Fu ◽  
Tian Tong Guo ◽  
Li Chen ◽  
Hui Qing Mao
Keyword(s):  
Fatigue Life ◽  
Working Conditions ◽  
Theoretical Basis ◽  
Life Prediction ◽  
Large Scale ◽  
Local Stress ◽  
Analysis Software ◽  
Element Analysis ◽  
Life Analysis ◽  
Fatigue Life Analysis

Based on the theory of fatigue life prediction and by using the local stress-strain method and the material S-N curve of Q235 deduced by empirical formula; the fatigue was analyzed for the key parts of large-scale liner vibration screener by means of the general finite element analysis software, ANSYS. Thereby, the working conditions of force bearing, reliability and fatigue life-span of the key parts can be judged. The study will provide a theoretical basis for the design , manufacture, and installation of the large-scale liner vibration screener.

scholarly journals Impact Characteristics and Fatigue Life Analysis of Multi-Wire Recoil Spring for Guns

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Zhifang Wei ◽  
Xiaolian Zhang ◽  
Yecang Hu ◽  
Yangyang Cheng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Helical Spring ◽  
Element Analysis ◽  
Life Analysis ◽  
Fatigue Life Analysis ◽  
The Impact

Recoil spring is a key part in automatic or semi-automatic weapons re-entry mechanism. Because the stranded wire helical spring (SWHS) has longer fatigue life than an ordinary single-wire cylindrically helical spring, it is often used as a recoil spring in various weapons. Due to the lack of in-depth research on the dynamic characteristics of the current multi-wire recoil spring in recoil and re-entry processes, the fatigue life analysis of the current multi-wire recoil spring usually only considers uniform loading and does not consider dynamic impact loads, which cannot meet modern design requirements. Therefore, this paper proposes a research method for fatigue life prediction analysis of multi-wire recoil spring. Firstly, based on the secondary development of UG, a three-wire recoil spring parameterized model for a gun is established. Secondly, ABAQUS is used to carry out a finite element analysis of its dynamic response characteristics under impact, and experimental verification is performed. Then, based on the stress-time history curve of the dangerous position obtained by finite element analysis, the rain flow counting method is used to obtain the fatigue stress spectrum of recoil spring. Finally, according to the Miner fatigue cumulative damage theory, the fatigue life prediction of the recoil spring based on the S-N curve of the material is compared with experimental results. The research results show that the recoil spring has obvious transient characteristics during the impact of the bolt carrier. The impact velocity is far greater than the propagation speed of the stress wave in the recoil spring, which easily causes the spring coils to squeeze each other. The maximum stress occurs at the fixed end of the spring. And the mean fatigue curve (50% survival rate) is used to predict the life of the recoil spring. The calculation result is 8.6% different from the experiment value, which proves that the method has certain reliability.

Predicting Reliability of Structural Systems Using Classification Method

2013 ◽  
Author(s):  
Recep M. Gorguluarslan ◽  
Seung-Kyum Choi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Probabilistic Neural Network ◽  
Engineering Problem ◽  
Support Vector ◽  
Structural Systems ◽  
Element Analysis ◽  
Life Analysis ◽  
Fatigue Life Analysis

This research examines classification approaches for estimating the reliability of structural systems. To validate the accuracy and efficiency of the classification methods, a practical engineering problem; namely, a spider assembly of a washing machine, has been considered. For the spider assembly, fatigue life test, finite element analysis, physical experimentation, and a classification processes are conducted in order to establish the analytical certification of its current design. Specifically, the finite element analysis and fatigue life analysis are performed and their results are validated compared to physical experimental results. The classification process is developed to estimate the probability of failure of the spider assembly in terms of stress and fatigue life. The relationship between the random quantities and structural responses of the spider assembly is established using probabilistic neural network and the support vector machine classifiers. The performance margin of the spider assembly is fully identified based on the estimated failure probability and structural analysis results from the fatigue life analysis and classifications.

“STRUCTURE ANALYSIS, CONTACT STRESS ANALYSIS AND FATIGUE LIFE ANALYSIS OF SPUR GEAR ASSEMBLY BY USING FEM”

2018 ◽  
Vol 4 (4) ◽  
pp. 13
Author(s):  
Anand Mohan Singh ◽  
Megha Bhawsar ◽  
Neeraj Kumar Nagayach
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Failure Analysis ◽  
Contact Stress ◽  
Spur Gear ◽  
Contact Analysis ◽  
Element Analysis ◽  
Life Analysis ◽  
Fatigue Life Analysis

In this present work a virtual environment has been created to investigate the failure analysis on spur gear assembly in which structural analysis, fatigue failure analysis and contact stress analysis have been performed using finite element method. For this work, a three dimensional cad model has been created and imported to ANSYS workbench for further finite element analysis. Various boundary conditions have been used to perform structural, fatigue failure assessment and contact analysis such as revolute joints is provided with Body Ground connection for 60 rpm for structure analysis, Augmented Lagrange method is set for contact analysis, for fatigue life analysis the fatigue strength factor is used as 0.85 for fully reverse loading and the life of shear stress in cycles and for the contact analysis linear and nonlinear contact are used for both source and target body. It has been observe that contact stress and bending stress not attain their maximum values at the same points, if the contact stress minimize in primary design stage then the failure of gear can minimized by analysis of the problem during the earlier stage of design. It can also be state that by using finite element analysis complex analysis like fatigue and contact analysis can be performed very accurately within a very short time and cost effectively rather than experimental analysis.

Modification optimization-based fatigue life analysis and improvement of EMU gear

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yong-Hua Li ◽  
Chi Zhang ◽  
Hao Yin ◽  
Yang Cao ◽  
Xiaoning Bai
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Engineering Practice ◽  
Analysis Method ◽  
Intelligent Algorithm ◽  
Transient Dynamic Analysis ◽  
Content Type ◽  
Gear Modification ◽  
Life Analysis ◽  
Fatigue Life Analysis

PurposeThis paper proposes an improved fatigue life analysis method for optimal design of electric multiple units (EMU) gear, which aims at defects of traditional Miner fatigue cumulative damage theory.Design/methodology/approachA fatigue life analysis method by modifying S–N curve and considering material difference is presented, which improves the fatigue life of EMU gear based on shape modification optimization. A corrected method for stress amplitude, average stress and S–N curve is proposed, which considers low stress cycle, material difference and other factors. The fatigue life prediction of EMU gear is carried out by corrected S–N curve and transient dynamic analysis. Moreover, the gear modification technology combined with intelligent optimization method is adopted to investigate the approach of fatigue life analysis and improvement.FindingsThe results show that it is more corresponded to engineering practice by using the improved fatigue life analysis method than the traditional method. The function of stress and modification amount established by response surface method meets the requirement of precision. The fatigue life of EMU gear based on the intelligent algorithm for seeking the optimal modification amount is significantly improved compared with that before the modification.Originality/valueThe traditional fatigue life analysis method does not consider the influence of working condition and material. The life prediction results by using the method proposed in this paper are more accurate and ensure the safety of the people in the EMU. At the same time, the combination of intelligent algorithm and gear modification can improve the fatigue life of gear on the basis of accurate prediction, which is of great significance to the portability of EMU maintenance.

scholarly journals Influence of Weld Toe Radii on Fatigue Life Prediction

2018 ◽  
Vol 165 ◽  
pp. 22025 ◽  
Author(s):  
Kin Shun Tsang ◽  
John H. L. Pang ◽  
Hsin Jen Hoh
Keyword(s):  
Fatigue Life ◽  
Stress Intensity ◽  
Life Prediction ◽  
Crack Depth ◽  
Local Stress ◽  
Fatigue Life Prediction ◽  
Element Analysis ◽  
Weld Toe ◽  
Point Bend ◽  
Welded Pipe

A study was carried out to investigate the influence of the weld toe radii on the fatigue strength of butt welded joints loaded in bending and tension. Fatigue analysis starting from weld toe cracks in marine and offshore welded pipe specimens were conducted using cut-out four-point bend fatigue test specimens. Fatigue life can be enhanced by reducing the local stress concentration generated by weld toe radius effects. This study investigated the effect of different weld toe radii on the stress intensity factor at the region of the weld toe through Finite Element Analysis (FEA). FEA was used to model a butt welded steel plate extracted from a pipe subject to tension and four-point bend loading. Semi-elliptical surface (SESC) cracks were modeled at the weld toe region with different SESC crack depth and surface crack length. Four weld toe radii and two modes of loading were investigated. The stress intensity factors, weald toe magnification factors, or Mkc and Mka are reported and used for fatigue life prediction.

scholarly journals Compliance and Fatigue Life Analysis of U-shaped Flexure Hinge

Mechanika ◽  
2019 ◽  
Vol 25 (6) ◽  
pp. 501-510
Author(s):  
JingJing Liang ◽  
Rui Qin Li ◽  
Shao Ping Bai ◽  
Qing Li ◽  
Shu Hua Kang
Keyword(s):  
Fatigue Life ◽  
Major Axis ◽  
Flexure Hinge ◽  
Structure Parameters ◽  
Element Analysis ◽  
Flexure Hinges ◽  
Notch Width ◽  
Life Analysis ◽  
Fatigue Life Analysis ◽  
Close Form

This paper establishes four models of U-shaped flexure hinges with different notch shapes and structure parameters, and presents the close-form compliance equations for the four structure types of U-shaped flexure hinges. The compliance of the flexure hinges is developed based on the Castiglione’s second theorem and calculus theory. A relationship between compliances and structure parameters is deduced using the models. The influences of the notch structure parameters on the compliance of the flexure hinges are investigated. Moreover, fatigue life of U-shaped flexure hinges is studied by finite element analysis, the results show that the fatigue life of flexure hinge increases gradually with the increasing of flexure hinge center thickness t and hinge notch width m.  With the increasing of the major axis of the ellipse a and semi minor axis of the ellipse b, the fatigue life of flexure hinge fluctuates locally, the general trend is a gradual decrease. The stress and fatigue life of U-shaped flexure hinges and arc flexure hinge are compared. The results show that the reliability of U-shaped flexure hinge is higher than that of circular arc flexure hinge.

scholarly journals Fatigue Life Prediction of Steam Generator Tubes by Tube Specimens with Circular Holes

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 322 ◽  
Author(s):  
Qiwei Wang ◽  
Junfeng Chen ◽  
Xiao Chen ◽  
Zengliang Gao ◽  
Yuebing Li
Keyword(s):  
Finite Element Analysis ◽  
Fatigue Life ◽  
Life Prediction ◽  
Local Stress ◽  
Fatigue Life Prediction ◽  
Stress And Strain ◽  
Element Analysis ◽  
Transfer Tube ◽  
Inconel 690 ◽  
Circular Holes

Heat exchangers manufactured from Inconel 690 tubes are widely used for steam generators in nuclear power plants. Inconel 690 tubes have suffered failures of fatigue fracture due to flow induced vibration. It is difficult to obtain the fatigue life of the tube directly since the conventional fatigue test would potentially cause end fatigue failure due to the stress concentration at the clamp end. In this study, a thin-walled Inconel 690 tube with circular hole is designed to deduce the fatigue life of smooth tube based on the notch fatigue life prediction technology. Firstly, the local stress and strain distributions around the hole based on the finite element analysis are discussed. Local stress-strain is calculated and compared with Neuber’s ruler. Meanwhile, fatigue life tests using tube specimens with circular holes are carried out. Finally, based on the best-fitted fatigue life curve of Inconel 690 alloy, the fatigue life of tube specimen is estimated from the local strain according to Neuber’s ruler. The results show that the local stress and strain estimated by Neuber’s ruler are basically consistent with those obtained by finite element analysis. Compared with the average fatigue life of nickel-based alloy, the new predicted equivalent fatigue life of heat Inconel 690 transfer tube with a hole is higher. The Inconel 690 heat transfer tube has better fatigue performance.

Fatigue Life Analysis of Shaking Table’s Exciting Beam Based on Finite Element Analysis

2011 ◽  
Vol 421 ◽  
pp. 208-211
Author(s):  
Hai Bin Gong ◽  
Jian Su ◽  
Dong Lin Zhang ◽  
Li Wang ◽  
Xing Yu Wang
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Large Scale ◽  
Time History ◽  
Shaking Table ◽  
Reliability Test ◽  
Test Bed ◽  
Element Analysis ◽  
Exciting Beam ◽  
Fatigue Life Analysis

With large scale increases of the train speed, the development of one reliability test bed which can simulate vibration environment becomes the extremely urgent task. The shaking table is one of key reliability test equipments, and its design and development is in needs immediately. The fatigue strength is basic design index of shaking table. Based on the load time history acquired by track spectrum, combined with finite element model of exciting beam and material properties, the fatigue life of exciting beam is predicted by Miner cumulative damage rule method in this paper.

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