scholarly journals Numerical Validation of Two-Parameter Weibull Model for Assessing Failure Fatigue Lives of Laminated Cementitious Composites—Comparative Assessment of Modeling Approaches

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 110 ◽  
Author(s):  
Asad Hanif ◽  
Yongjae Kim ◽  
Cheolwoo Park
Keyword(s):  
Fatigue Life ◽  
Weibull Distribution ◽  
Comparative Assessment ◽  
Life Assessment ◽  
Distribution Model ◽  
Cementitious Composites ◽  
Parameter Distribution ◽  
Modeling Approaches ◽  
Fatigue Life Assessment ◽  
Two Parameter

In this paper, comparative assessment of failure fatigue lives of thin laminated cementitious composites (LCCs) modeled by two modeling approaches—double-parameter Weibull distribution model and triple-parameter distribution model—was carried out. LCCs were fabricated of ordinary Portland cement (OPC), fly ash cenosphere (FAC), quartz sand, and reinforcing meshes and fibers. The failure fatigue life assessment at various probabilities by the two-parameter model was based on numerical calculations whereas the three-parameter model was applied by an open source program—ProFatigue®. Respective parameters, shape and scale parameters in the two-parameter Weibull distribution model while shape, scale, and location parameters in three-parameter model were determined, and the corresponding probabilistic fatigue lives at various failure probabilities were calculated. It is concluded that the two-parameter model is more accurate in probabilistic fatigue life assessment of double-layer mesh-reinforced LCCs, whereas for single-layer reinforced LCCs, both models could be used at a fair confidence level.

Reliability Analysis of the Home and Abroad CNC Equipment Used in Automobile Parts Industry

2014 ◽  
Vol 651-653 ◽  
pp. 802-807
Author(s):  
Bin Ma ◽  
Min Luo ◽  
Zhi Chu Chen ◽  
Li Xin Cao
Keyword(s):  
Weibull Distribution ◽  
Empirical Distribution Function ◽  
Least Squares Method ◽  
Empirical Distribution ◽  
Distribution Model ◽  
Parameter Distribution ◽  
Linear Parameter ◽  
Auto Parts ◽  
Fault Information ◽  
Two Parameter

Through analyzing fault information of the home and abroad CNC equipment used in the same auto parts production, the fault data fitting were implemented in this paper. Assuming time between failure probability density function and the empirical distribution function follow the Weibull distribution, A reliability statistical model was built using the least squares method and a linear parameter distribution model regression method. The linear correlation test and the Weibull distribution fault interval obtained show the fact that both the home and abroad equipment are subject to the two parameter Weibull distribution, and after calculating the three indexes of reliability assessment, a conclusion can be made that the reliability of domestic equipment in the study is slightly lower than that of foreign equipment.

Fatigue life assessment of friction spot welded 7050-T76 aluminium alloy using Weibull distribution

2016 ◽  
Vol 87 ◽  
pp. 381-390 ◽  
Author(s):  
P.S. Effertz ◽  
V. Infante ◽  
L. Quintino ◽  
U. Suhuddin ◽  
S. Hanke ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Weibull Distribution ◽  
Aluminium Alloy ◽  
Life Assessment ◽  
Fatigue Life Assessment ◽  
Spot Welded

scholarly journals Mapping of scatter in fatigue life assessment of welded structures—a round-robin study

2021 ◽  
Author(s):  
Gustav Hultgren ◽  
Mansoor Khurshid ◽  
Peter Haglund ◽  
Zuheir Barsoum
Keyword(s):  
Fatigue Life ◽  
Round Robin ◽  
Life Assessment ◽  
Fatigue Life Assessment ◽  
Fatigue Life Estimation ◽  
Box Structures ◽  
Load Carrying ◽  
Local Stresses ◽  
Sources Of Variation ◽  
Global And Local

AbstractA round-robin study has been carried out within a national project in Sweden with the addition of an international participant, where several industrial partners and universities are participating. The project aims to identify variation and sources of variation in welding production, map scatter in fatigue life estimation, and define and develop concepts to reduce these, in all steps of product development. The participating organisations were asked to carry out fatigue life assessment of welded box structures, which is a component in load-carrying structures. The estimations of fatigue life have also been compared with fatigue test results. Detailed drawings, loads and material data were also given to the participants. The participants were supposed to use assessment methods based on global and local stresses using the design codes or recommendations they currently use in-house. Differences were identified between both methods and participants using the same codes/recommendations. Applicability and conditions from the cases in the codes were also identified to be differently evaluated between the participants. It could be concluded that for the applied cases the nominal stress method often overestimated the fatigue life and had a high scatter in the estimations by different participants. The effective notch method is conservative in comparison to the life of tested components with little scatter between the results derived by the participants.

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