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RISS 인기검색어
- 검색키워드
- 저자 : Ahmad Mujahid Ahmad Zaidi (검색결과 2 건)
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Numerical study of 2024 T3 aluminum plates subjected to impact and perforation
Mohd Norihan Ibrahim,Waluyo Adi Siswanto,Ahmad Mujahid Ahmad Zaidi 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
The paper describes a work focused on the process of perforation of aluminum sheet. A numerical investigation has been carried out toanalyze in details the perforation process subjected to normal impact by different nose shapes of projectiles. The perforation process hasbeen simulated by the application of 3D analysis using IMPACT dynamic FE program suite. The comparison on failure modes dependingon the projectile nose shape have been studied and evaluated. An appropriate constitutive relation was applied to describe the materialbehavior of the aluminum sheet. The study covered different failure modes including petalling, plug ejection and circumference neckingof perforated aluminum sheet according to different level of impact velocity ranging from 100 m/s to 600 m/s. In this investigation, aspecial attention will be given on the deformation and failure.
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Qadir Bux alias Imran Latif,Ismail Abdul Rahman,Ahmad Mujahid Ahmad Zaidi,Kamran Latif 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.1
Penetration is the basic element of designing protective concrete structure against the local impact damage of hard missile. Impactenergy is the dominant cause of damage in moving accidents. When hard projectile collides with concrete target, it is the impactenergy of the projectile that makes concrete target to deform. Therefore, it is vital to study critical impact energy required to causespenetration. An analytical model is developed to predict the required critical impact energy for maximum penetration without reareffects in concrete slabs when it is impacted with hard projectile. The nose shape factor Ni also has been introduced with inclusion ofempirical friction factor Nf, as modification in Chen & Li nose shape factor for ogive nose hard projectile. The newly developedanalytical model and nose shape factor Ni is examined for CRH = 2.0, CRH = 3.0, and CRH = 4.25. It was found that the predictedresults from analytical model with nose shape Ni are in close relation with experimental data in all cases as compared to predictedresults with traditional Li and Chen nose shape N*. In, General, the analytical model generates encouraging prediction which isconsistent and follows a general trend of experimental results.
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