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Article
Finite Element Analysis of Fire Extinguisher for Different Types of Composite Materials

Author: Raed Naeem Hwyyin
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 13 Pages: 2617-2636
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The stress and strain concentrations of a fire extinguisher made of different types of composite materials are investigated. The prediction of the failure limit and its location in the proposed design is always the associated problem that is inescapable and difficult to be solved completely in the shape design of pressure vessel. A three dimensional analysis in finite element method was made for determining theconcentration of stress and strain of the extinguisher. The xtinguisher is made of polyester resin reinforced with different types of fiber glass. The aim of the present investigation is to study the effect of different levels of internal pressure and different types of composite material on the failure limit for limiting capability of applying thatproduct in practical field.The results are compared with those obtained from the corresponding model where xy-strain of composite material reinforced with random fiber glass increases with rate (98%) while in the composite material reinforced with fiber glass arrangedwith 45o it increases with rate (99.8 %) due to increase in the internal pressure to (0.9-5) MPa. The comparison between theoretical and numerical results gives a good agreement.


Article
Effect of Head Types on the Free Vibration and Fatigue for Horizontal LPG Pressure Vessels
تأثير نوع نهايات رؤوس خزانات الضغط الأفقية لغاز البترول المسال على الاهتزاز الحر والكلال

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Abstract

Pressure vessels are the heart of plants and oil refineries stations. In many engineering applications such vessels can be subjected to periodic loading either internally due to the charging and discharging process or externally due to the excitation from other nearby components such as pumps, compressors or from seismic. So that in spite of a good design according static assumption it may be critical in dynamics. In this work a horizontal pressure vessel with accessories subjected to liquefied petroleum gas pressure LPG is considered. Three models of different head types are investigated herein namely; Deep torispherical, Elliptical 2:1 and Hemispherical. The design and material selections are chosen as per ASME. For practical service many accessories are attached to the vessel such as manhole, supports, inlet and outlet opining. Finite Element method via ANSYS R18.2 is introduced for the numerical analysis. The fatigue life in case of fully reversed cyclic loading are estimated and located. Vibration characteristics such as mode shapes and natural frequencies for the lowest five modes are evaluated and compared. It is found that the fatigue life can be increased as higher as 180% for hemi- spherical head as compared with deep torispherical head pressure vessel and the lowest four natural frequencies are nearly identical for all models, however significant change observed in the fifth natural frequency.

تمثل اوعية الضغط الجزء الرئيسي في المحطات ومحطات تكرير النفط وفي اغلب التطبيقات الهندسية تكون هذه الاوعية او الخزانات معرضة الى احمال دورية متكررة اما بسبب داخلي وهو عملية التفريغ والملئ او خارجي بسبب تحفيز او اثاره بسبب مكونات قريبة عليها مثل المضخات والمكابس او التي تنشأ تسبب اهتزازات. تم في هذا البحث تحليل خزان افقي مع ملحقاته مثل المانهول وفتحة الدخول والخروج ومعرض الى ضغط الغاز المسال. تم اختبار ثلاثة نماذج لنهايات مختلفة (محدبة وبيضاوي ونصف كروي)، التصميم واختيار المواد تم وفق كود ASME. تم استخدام طريقة العناصر المحددة باستخدام برنامج الانسس 18 للتحليل العددي لتحديد عمر الكلال في حالة التحميل الدوري المعكوس الكامل وتحديد موقعه. وكذلك دراسة خصائص الاهتزاز مثل أشكال الطور و الترددات الطبيعية وذلك لأدنى خمس ترددات ، وقد وجد أن عمر الاجهاد او الكلال يمكن زيادته إلى أعلى من 180٪ للرأس او النهاية الكروية مقارنةً برأس او النهاية تكوربيني المحدبة العميقة وان الترددات الطبيعية لغاية الرابعه تكون متطابقة تقريبًا لجميع النماذج ، ومع ذلك فقد لوحظ اختلافات واضحة في التردد الطبيعي الخامس.

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