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224 results on '"al-Mousawi M"'

7. Transient flexural wave propagation in beams with discontinuities of cross section

Author

Al-Mousawi, M. M. M.

Subjects
624.1, TA Engineering (General). Civil engineering (General), TJ Mechanical engineering and machinery
Abstract

An investigation was carried out to determine the transient response of finite beams with discontinuities of cross section subiected to eccentric longitudinal impact. Experiments were performed on several stepped beams with increased and reduced cross section and with various end conditions. The analysis was based on the Timoshenko beam theory which takes into account the effects of shear deformation and rotatory inertia. The governing equations were solved as a system of two second order hyperbolic partial differential equations. The numerical solution was obtained by the method of characteristics and theoretical predictions were in excellent agreement with experimental observations at several monitoring positions along the various test beams. The agreement between theoretical and experimental results verified the adequacy of the Timoshenko theory and its numerical solution for describing the flexural wave propagation in beams with discontinuities of cross section. The effect of the discontinuity of beam cross section on the bending moment time distribution showed the importance of reflections in estimating the level of stresses and strains in structural elements when subjected to transient dynamic loading. The computer program developed in this work can be used to obtain numerical solutions for. a wide range of flexural wave propagation problems in beams with discontinuities of cross section with various end conditions and loading configurations.

Published
1982

32. Modeling and analysis of process parameters in EDM of Ni35Ti35Zr15Cu10Sn5 high-temperature high entropy shape memory alloy by RSM Approach

Author

Al-Mousawi Mohammed Ali, Al-Shafaie Saad Hameed, and Khulief Zuheir Talib

Subjects
ni-ti-zr-cu-sn (ht-he-sma), edm, ccd, rsm, anova, Engineering (General). Civil engineering (General), TA1-2040, Technology (General), T1-995, Manufactures, TS1-2301
Abstract

The Electrical Discharge Machining (EDM) technique demonstrates proficiency in fabricating precise and intricate geometries, especially in challenging-to-machine materials like high-entropy shape memory alloys. Analyzing and optimizing machining parameters are crucial for their direct impact on mechanical properties and overall product efficiency. The main responses chosen to evaluate the processes are material removal rate (MRR), electrode wear rate (EWR), and surface roughness (Ra). At the same time, the associated machining conditions were discharge current (Ip), pulse-on time (Ton), and pulse-off time (Toff). EDM is a multi-response process; therefore, the method of Response Surface Methodology (RSM) is utilized to assess the influence of machining parameters on Ni35Ti35Zr15Cu10Sn5 (at%) high-temperature high entropy shape memory alloy (HT-HE-SMA) using a copper electrode. Based on a center composite design (CCD), experiments were analyzed using Minitab19 software. To identify the most influential parameters, a thorough analysis of variance (ANOVA) at various significance levels (5%) was performed, checking the sufficiency of all fitted second-order regression models. Discharge current, pulse-on time, and pulse-off time were identified as significant factors that affect output (MRR, EWR, and Ra). The model adequacy of the current experimental investigation is perfect, with determination coefficients (R2) of 97.82% for MRR, 95.36% for EWR, and 99.53% for Ra.

Published
2024
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44. The declaration of Istanbul on Organ trafficking and transplant tourism

Author

Abboud, O, Abbud-Filho, M, Abdramanov, K, Abdulla, S, Abraham, G, Abueva, AV, Aderibigbe, A, Al-Mousawi, M, Alberu, J, Allen, RDM, Almazan-Gomez, LC, Alnono, I, Alobaidli, AA, Alrukhaimi, M, Álvarez, I, Assad, L, Assounga, AG, Baez, Y, Bagheri, A, Adel Bakr, M, Bamgboye, E, Barbari, A, Belghiti, J, Abdallah, TB, Mohamed, SBA, Bos, M, Britz, R, Budiani, D, Capron, A, Castro, CR, Chapman, J, Zhonghua, KC, Codreanu, I, Cole, E, Cozzi, E, Danovitch, G, Davids, R, De Broe, M, De Castro, L, Delmonico, FL, Deraoi, R, Dittmer, I, Domíngue-Gil, B, Duro-Garcia, V, Ehtuish, E, El-Shoubaki, H, Epstein, M, Fazel, I, Fernandez Zincke, E, Garcia-Gallont, R, Gohd, AJ, Gill, J, Glotz, D, Gopalakrishnan, G, Gracida, C, Grinyo, J, Ha, J, Haberal, MA, Hakim, N, Harmon, W, Hasegawa, T, Ahmed, AH, Hickey, D, Hiesse, C, Hongji, Y, Humar, I, Hurtado, A, Ismail, MW, Ivanovski, N, Jha, V, Kahn, D, Kamel, R, Kirpalani, A, Kirste, G, Kobayashi, E, Koller, J, Kranenburg, L, Lameire, N, Laouabdia-Sellami, K, Lei, R, Levin, A, Lloveras, J, Lóhmus, A, Luciolli, E, Lundin, S, Wai, CL, Lynch, S, Maïga, M, Bruneel, MFM, Maric, N, Martin, Dominique, Masri, M, Matamoros, MA, Matas, A, McNeil, A, Melser, B, Megi, E, Moazam, F, Mohsin, N, Mor, E, Abboud, O, Abbud-Filho, M, Abdramanov, K, Abdulla, S, Abraham, G, Abueva, AV, Aderibigbe, A, Al-Mousawi, M, Alberu, J, Allen, RDM, Almazan-Gomez, LC, Alnono, I, Alobaidli, AA, Alrukhaimi, M, Álvarez, I, Assad, L, Assounga, AG, Baez, Y, Bagheri, A, Adel Bakr, M, Bamgboye, E, Barbari, A, Belghiti, J, Abdallah, TB, Mohamed, SBA, Bos, M, Britz, R, Budiani, D, Capron, A, Castro, CR, Chapman, J, Zhonghua, KC, Codreanu, I, Cole, E, Cozzi, E, Danovitch, G, Davids, R, De Broe, M, De Castro, L, Delmonico, FL, Deraoi, R, Dittmer, I, Domíngue-Gil, B, Duro-Garcia, V, Ehtuish, E, El-Shoubaki, H, Epstein, M, Fazel, I, Fernandez Zincke, E, Garcia-Gallont, R, Gohd, AJ, Gill, J, Glotz, D, Gopalakrishnan, G, Gracida, C, Grinyo, J, Ha, J, Haberal, MA, Hakim, N, Harmon, W, Hasegawa, T, Ahmed, AH, Hickey, D, Hiesse, C, Hongji, Y, Humar, I, Hurtado, A, Ismail, MW, Ivanovski, N, Jha, V, Kahn, D, Kamel, R, Kirpalani, A, Kirste, G, Kobayashi, E, Koller, J, Kranenburg, L, Lameire, N, Laouabdia-Sellami, K, Lei, R, Levin, A, Lloveras, J, Lóhmus, A, Luciolli, E, Lundin, S, Wai, CL, Lynch, S, Maïga, M, Bruneel, MFM, Maric, N, Martin, Dominique, Masri, M, Matamoros, MA, Matas, A, McNeil, A, Melser, B, Megi, E, Moazam, F, Mohsin, N, and Mor, E

Published
2008

49. RENAL RE-TRANSPLANTATION: IS IT JUSTIFIED?

Author

Moniri, S, primary, Samhan, M, additional, said, T, additional, Nampoory, M R.N, additional, Nair, P, additional, Al Otaibi, T, additional, Al-Mezairai, I, additional, and Al-Mousawi, M, additional

Published
2008
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