The non-probability interval reliability design method on entire roller embedded shapemeter roll

The expression of reliability estimation method for fatigue life of machine parts was derived, and two kinds of stress cycles (reversed cycle and un-symmetric reversed cycle) were considered. An iteration method is presented and the corresponding computer program named STRENGTH-2 is developed for estimating reliable life of machine parts. The engineering application results show that the calculated results are close to experimental results. The proposed method can be convenient to carry out the fatigue reliability design for machine parts under the action of uni-axial and multi-axial loadings, and promote the popularization and application of existing anti-fatigue design method. It has the high value of engineering application.

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Study on Statistical Parameters of Resistance of Steel Highway Bridge Reliability Design in China

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.163-167.3324 ◽

2010 ◽

Vol 163-167 ◽

pp. 3324-3327 ◽

Cited By ~ 1

Author(s):

Kun Li

Keyword(s):

Design Method ◽

Limit State ◽

Highway Bridges ◽

Calculation Model ◽

Highway Bridge ◽

Statistical Parameters ◽

Probability Limit ◽

Reliability Design ◽

Structure Reliability ◽

Bridge Reliability

The coming national specification for steel highway bridge will adopt the design method of probability limit state based on the structure reliability theory. Then the statistical parameters of loads and resistance play a key role in this method. Based on the extensive survey and investigation on site, the parameters of resistance are calculated in the study. In the work, three aspects of resistance’s uncertainty which are the uncertainty of materials properties, geometric parameters of members and calculation model are analyzed respectively. Then, the statistical parameters of five typical members of two commonly used steels—Q235q and Q345qD—in steel highway bridges are calculated. The recommended statistical parameters of resistance of steel highway bridge can be a reference for the new specification.

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Reliability Estimation of Fatigue Life for Machine Parts under Uniaxial Constant Amplitude Load

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.249-250.632 ◽

2012 ◽

Vol 249-250 ◽

pp. 632-635

Author(s):

Yu He Li ◽

Xin Li Bai ◽

Ying Fang Zhang

Keyword(s):

Fatigue Life ◽

Design Method ◽

Engineering Application ◽

Reliability Estimation ◽

Estimation Methods ◽

Fatigue Reliability ◽

Constant Amplitude ◽

Reliability Design ◽

Fatigue Design ◽

Machine Parts

Two methods acquiring p-S-N curve for machine parts are given, namely directly searching out the p-S-N curve of the material from material database and using the idealized p-S-N curve. Reliability estimation methods of fatigue life of machine parts are derived under uniaxial constant amplitude load. Two kinds of circumstances (fixed stress and probabilistic stress) and two kinds of stress cycles (reversed cycle and unsymmetric reversed cycle) are considered. An iteration method is presented and the corresponding computer program is developed for estimating reliable life of machine parts. The engineering application results show that the calculated results are closer to experimental results. The suggested method can be convenient to fatigue reliability design of machine parts. It has good stimulative effect on popularization and application of existing anti-fatigue design method for machine parts, and high value of engineering application.

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An approach of robust reliability design for mechanical components

Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering ◽

10.1243/095440805x8566 ◽

2005 ◽

Vol 219 (3) ◽

pp. 275-283 ◽

Cited By ~ 20

Author(s):

Y M Zhang ◽

X D He ◽

Q L Liu ◽

B C Wen

Keyword(s):

Robust Design ◽

Design Method ◽

Random Variables ◽

Design Parameters ◽

Theoretical Formula ◽

Reliability Design ◽

Reliability Sensitivity ◽

Mechanical Components ◽

Reliability Based Optimization ◽

Robust Reliability

The reliability-based optimization, the reliability sensitivity technique, and the robust design are employed to present a practical and effective approach of robust reliability design for mechanical components on the condition of known probabilistic characteristics of original random variables. The theoretical formula of robust reliability design for mechanical components is obtained. The respective program can be used to obtain the robust reliability design parameters accurately and quickly. According to the numerical results, the method proposed is a convenient and practical robust reliability design method.

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Reliability Analysis in Presence of Random Variables and Fuzzy Variables

Journal of Applied Mathematics ◽

10.1155/2015/365051 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Cui Lijie ◽

Lü Zhenzhou ◽

Li Guijie

Keyword(s):

Probability Density Function ◽

Probability Density ◽

Computational Efficiency ◽

Reliability Index ◽

Random Variables ◽

Computational Technique ◽

Reliability Design ◽

Fuzzy Variables ◽

Interval Reliability ◽

Mixed Uncertainties

For mixed uncertainties of random variables and fuzzy variables in engineering, three indices, that is, interval reliability index, mean reliability index, and numerical reliability index, are proposed to measure safety of structure. Comparing to the reliability membership function for measuring the safety in case of mixed uncertainties, the proposed indices are more intuitive and easier to represent the safety degree of the engineering structure, and they are more suitable for the reliability design in the case of the mixed uncertainties. The differences and relations among three proposed indices are investigated, and their applicability is compared. Furthermore, a technique based on the probability density function evolution method is employed to improve the computational efficiency of the proposed indices. At last, a numerical example and two engineering examples are illustrated to demonstrate the feasibility, reasonability, and efficiency of the computational technique of the proposed indices.

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