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RISS 인기검색어
- 검색키워드
- 저자 : Hashem Babaei (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Dynamic compaction of cold die Aluminum powders
Babaei, Hashem,Mostofi, Tohid Mirzababaie,Alitavoli, Majid,Namazi, Nasir,Rahmanpoor, Ali Techno-Press 2016 Geomechanics & engineering Vol.10 No.1
In this paper, process of dynamic powder compaction is investigated experimentally using impact of drop hammer and die tube. A series of test is performed using aluminum powder with different grain size. The energy of compaction of powder is determined by measuring height of hammer and the results presented in term of compact density and rupture stress. This paper also presents a mathematical modeling using experimental data and neural network. The purpose of this modeling is to display how the variations of the significant parameters changes with the compact density and rupture stress. The closed-form obtained model shows very good agreement with experimental results and it provides a way of studying and understanding the mechanics of dynamic powder compaction process. In the considered energy level (from 733 to 3580 J), the relative density is varied from 63.89% to 87.41%, 63.93% to 91.52%, 64.15% to 95.11% for powder A, B and C respectively. Also, the maximum rupture stress are obtained for different types of powder and the results shown that the rupture stress increases with increasing energy level and grain size.
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Effect of gas detonation on response of circular plate- experimental and theoretical
Hashem Babaei,Tohid Mirzababaie Mostofi,Seyed Hamidreza Sadraei 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.56 No.4
A series of experimental results on thin mild steel plates clamped at the boundary subjected to gas detonation shock loading are presented. Detonation occurred by mixing Acetylene (C2H2)-Oxygen (O2) in various volume ratio and different initial pressure. The applied impulse is varied to give deformation in the range from 6 mm to 35 mm. Analytical modeling using energy method was also performed. Dependent material properties, as well as strain rate sensitivity, are included in the theoretical modeling. Prediction values for midpoint deflections are compared with experimental data. The analytical predictions have good agreement with experimental values. Moreover, it has been shown that the obtained model has much less error compared with those previously proposed in the literature.
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Study on the response of circular thin plate under low velocity impact
Babaei, Hashem,Mostofi, Tohid Mirzababaie,Alitavoli, Majid Techno-Press 2015 Geomechanics & engineering Vol.9 No.2
In this paper, forming of fully clamped circular plate by using low velocity impact system has been investigated. This system consists of liquid shock tube and gravity drop hammer. A series of test on mild steel and aluminum alloy plates has been done. The effect of varying both impact load and the plate material on the deflection are described. This paper also presents a simple model to prediction of mid-point deflection of circular plate by using input-output experimental data. In this way, singular value decomposition (SVD) method is used in conjunction with dimensionless number incorporated in such complex process. The results of obtained model have very good agreement with experimental data and it provides a way of studying and understanding the plastic deformation of impact loads.
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High-velocity powder compaction: An experimental investigation, modelling, and optimization
Tohid Mirzababaie Mostofi,Mostafa Sayah-Badkhor,Mohammad Rezasefat,Hashem Babaei,Togay Ozbakkaloglu 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.78 No.2
Dynamic compaction of Aluminum powder using gas detonation forming technique was investigated. The experiments were carried out on four different conditions of total pre-detonation pressure. The effects of the initial powder mass and grain particle size on the green density and strength of compacted specimens were investigated. The relationships between the mentioned powder design parameters and the final features of specimens were characterized using Response Surface Methodology (RSM). Artificial Neural Network (ANN) models using the Group Method of Data Handling (GMDH) algorithm were also developed to predict the green density and green strength of compacted specimens. Furthermore, the desirability function was employed for multi-objective optimization purposes. The obtained optimal solutions were verified with three new experiments and ANN models. The obtained experimental results corresponding to the best optimal setting with the desirability of 1 are 2714 kg·m-3 and 21.5 MPa for the green density and green strength, respectively, which are very close to the predicted values.
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