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RISS 인기검색어
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- 저자 : Hadi Moein (검색결과 2 건)
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Different finite element techniques to predict welding residual stresses in aluminum alloy plates
Hadi Moein,Iradj Sattari-Far 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.2
This study is a 3D thermomechanical finite element (FE) analysis of a single-pass and butt-welded work-hardened aluminum (Al)5456 plates. It aims to validate the use of FE welding simulations to predict residual stress states in assessing the integrity of weldedcomponents. The predicted final residual stresses in the plate from the FE simulations are verified through comparison with experimentalmeasurements. Three techniques are used to simulate the welding process. In the first two approaches, welding deposition is applied byusing element birth and interaction techniques. In the third approach, the entire weld zone is simultaneously deposited. Results show avalue at approximately the yield strength for longitudinal residual stresses of the welded center of the butt-welded Al alloy plates with athickness of 2 mm. Considering the application of a comprehensive heat source, along with heat loss modeling and the temperaturedependentproperties of the material, the approach without deposition predicts a reasonable distribution of residual stresses. However, theelement birth and interaction techniques, compared with the no-deposit technique, provide more accurate results in calculating residualstresses. Furthermore, the element interaction technique, compared with the element birth technique, exhibits higher efficiency and flexibilityin modeling the deposition of welded metals as well as less modeling cost.
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( Atefeh Akrami ),( Elham Makiabadi ),( Moein Askarpour ),( Katayoun Zamani ),( Amir Hadi ),( Amin Mokari-yamchi ),( Siavash Babajafari ),( Shiva Faghih ),( Abdollah Hojhabrimanesh ) 한국임상영양학회 2020 Clinical Nutrition Research Vol.9 No.1
Metabolic syndrome (MetS) is a chronic disease with inflammatory and hypercoagulable states. The current study aimed to compare the effects of flaxseed oil and sunflower oil consumption on the coagulation score and selected oxidative and inflammatory parameters in patients with MetS. In this randomized controlled clinical trial, 60 patients with MetS were allocated into 2 groups. One group received 25 mL/day flaxseed oil and the other group received 25 mL/day sunflower oil for 7 weeks. Maintenance diet including 15% protein, 55% carbohydrate, and 30% fat from daily total energy intake was designed for each participant. Serum levels of total antioxidant capacity (TAC) and interleukin 6 (IL-6), as well as coagulation score were measured before and after the intervention. Three 24-hour food records were taken during the study. Fifty-two of participants (27 in sunflower oil and 25 in flaxseed oil groups) completed the study. The baseline characteristics and dietary intakes were similar between patients. After 7 weeks, no significant difference was observed between the 2 groups regarding the serum TAC level and coagulation score (p > 0.05). However, serum IL-6 levels significantly decreased in the flaxseed oil group compared to the sunflower oil group (p = 0.017). No side effect was observed during the study due to the use of sunflower and flaxseed oils. We observed that consumption of flaxseed oil improved serum IL-6 levels but had no effect on oxidative stress and coagulation score in patients with MetS. Further studies are needed to confirm the veracity of our results.
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