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RISS 인기검색어
- 검색키워드
- 저자 : S. A. Torabi (검색결과 3 건)
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S. M. Hatefi,F. Jolai,S. A. Torabi,R. Tavakkoli-Moghaddam 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.4
Although disruptions rarely occur in the logistics networks, they can cause serious operational consequences and negative financial effects in the long-term. This paper proposes a fuzzy possibilistic programing model for designing a reliable forward-reverse logistics network with hybrid facilities in the presence of both uncertainty and random facility disruptions. For doing so, first several effective reliability strategies, i.e., introducing two kinds of reliable and unreliable facilities, partial and complete capacity disruptions, and a sharing strategy, are defined and incorporated into the developed reliability model to mitigate the impacts of random facility disruptions and improve resiliency of the network. Furthermore, a fuzzy possibilistic programing is utilized to deal with the existing epistemic uncertainties in the network parameters, i.e., fixed opening costs, variable processing and transportation costs, demands, returned products, and capacities. Finally, several numerical tests and also a sensitivity analysis are done to demonstrate the effectiveness and applicability of the proposed model in addition to the potency of the fuzzy possibilistic based solution method in this context.
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Averaged strain energy density to assess mixed mode I/III fracture of U-notched GPPS samples
Saboori, Behnam,Torabi, A.R.,Berto, F.,Razavi, S.M.J. Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.6
In the present contribution, fracture resistance of U-notched GPPS members under mixed mode I/III loading conditions is assessed by using the Averaged Strain Energy Density (ASED) criterion. This criterion has been founded based on the ASED parameter averaged over a well-defined control volume embracing the notch edge. The validation of the theoretical criterion predictions is evaluated through comparing with the results of a series of mixed mode I/III fracture tests conducted on rectangular-shaped GPPS specimens weakened by a single edge U-notch. A recently developed apparatus for mixed mode I/III fracture experiments is employed for measuring the fracture loads of the specimens. The test samples are fabricated with different notch tip radii with the aim of evaluating the influence of this major feature of the U-notched components on the mixed mode I/III fracture behavior. It is shown that the onset of brittle fracture in U-notched GPPS specimens under various combinations of tension and out-of-plane shear can well be predicted by means of the ASED criterion.
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Averaged strain energy density to assess mixed mode I/III fracture of U-notched GPPS samples
Behnam Saboori,A. R. Torabi,F. Berto,S. M. J. Razavi 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.6
In the present contribution, fracture resistance of U-notched GPPS members under mixed mode I/III loading conditions is assessed by using the Averaged Strain Energy Density (ASED) criterion. This criterion has been founded based on the ASED parameter averaged over a well-defined control volume embracing the notch edge. The validation of the theoretical criterion predictions is evaluated through comparing with the results of a series of mixed mode I/III fracture tests conducted on rectangular-shaped GPPS specimens weakened by a single edge U-notch. A recently developed apparatus for mixed mode I/III fracture experiments is employed for measuring the fracture loads of the specimens. The test samples are fabricated with different notch tip radii with the aim of evaluating the influence of this major feature of the U-notched components on the mixed mode I/III fracture behavior. It is shown that the onset of brittle fracture in U-notched GPPS specimens under various combinations of tension and out-of-plane shear can well be predicted by means of the ASED criterion.
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