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Theoretical Evaluation of Required PlasticWork in Bulging of Statically loaded Plate
التقییم النظري للشغل اللون اللازم لانبعاج صفیحة محملة استاتیكیا

Author: Mouhamed M. Hamadi
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 13 Part (A) Engineering Pages: 2489-2503
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Finding the amount of plastic deformation into metallic plates,metallicstructures,ships frame, bodies of different types of cylinders and reservoirsbodies as a result ofexposure tostaticor dynamic forceis so necessary todetermine the extentofdistortionand destructionhappening intheseobjects and this is one of the mainfactors in design calculations to determine the dimensions and thicknesses of thesebodies. Derivation anew theoreticalmodelto calculate theamount of work andforcerequired to bulge the sheet metalisa very important targetbecause of the lack of atheoretical relations to calculate the work of plastic deformation with goodapproximationoridenticalto exact required work and force; or vice-versa to find theamount of plastic deformation as a result of a specific work or specific force.This wasdonein this research where a theoretical model has been derivedthrough the expenseof work and force necessary to generatebulging in sheet metal. This theoretical modelhas been adopted on the mildsteel plates which are of wide application in practicallife. Results obtained from the theoretical model were compared with those obtainedfrom tests conducted onsimply supported circular steel plates made from low carbonsteel ,milled steel , of a (280) mm diameter and (1,2, 3, 4,5, 6, 8,10) mm thicknessandexposed to central force applied by a flat ended punch of 10 mm diameter. Theapplying force was increased gradually till it caused plastic deformation in the sheet,and then reached the state of shear of the disk, which is locatedunder the punch.Results comparison appear matchorsubstantial convergence between the practicalresultsand those obtained from the theoretical model to find the work and for ceittakes to plastic deformation in the tested plates.

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Article
Optimizing Coating Process Parameters by Using Taguchi Experimental Design to Increasing Wear Resistance of Steel CK50
امثل العوامل لعملية الطلاء باستخدام التصميم التجريبي لتاكوشي لزيادة مقاومة البلى للفولاذ CK50

Authors: Mouhamed M. Hamadi --- Amjad B. Abdulghafour --- Haider. N. Ugla
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 12 Part (A) Engineering Pages: 2862-2873
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The present investigation aims to increase the wear resistance for steel CK50 by using Hard Chromium electro plating process. The wear behavior of the specimen was investigated using pin-on-disk where the samples sliding against a steel disk under fixed conditions. The experiments designed according to Taguchi method several experiments have been carried based on an orthogonal array L9 with three parameters (time, current and temperature) at three levels (low, medium and high).The result of research based on the signal to noise ratio (S/R) depending on the condition smaller is the better approach, where the best optimal coating parameters have been arrived at (t2, A2, Temp1) i.e. time 20min, current 30 A/dcm2 and temperature 45 C° from the maximum values of average (S/N). Analysis of Variance (ANOVA) is applied to find out the significance and percentage contribution of each parameter. It has been observed that temperature has maximum contribution on Cr - coating process.

تهدف الدراسة الحالية الى زيادة مقاومة البلى للفولاذ (CK50) باستخدام عملية الطلاء الكهربائي بالكروم الصلد . وكان التحقيق في سلوك البلى للعينات باستخدام Pin-on-disk حيث ان العينات تنزلق على القرص الصلب تحت ظروف ثابتة. وقد صممت التجارب وفقاً لاسلوب تاكوشي).( العديد من التجارب اجريت على اساس المصفوفة المتعامدة L9 مع ثلاث عوامل (الوقت ، التيار ودرجة الحرارة) على ثلاث مستويات (منخفضة ومتوسطة وعالية) بناء على نسبة الاشارة على الضجيج (S/N) اعتماداً على الحالة الاصغر هي الافضـــل. الظروف الامثل للطلاء (t2, A2, Temp1) أي الوقت 20 دقيقة التيار 30 امبير /ديسم 2 ودرجة الحرارة 45 درجة مئوية تم ايجادها من القيمة العظمى لمعدل الاشارة على الضجيج (S/N) . يتم تطبيق تحليل التباين لمعرفة اهمية ونسبة مساهمة كل عامل. وقد لوحظ ان درجة الحرارة لها تأثير اكبر على عملية الطلاء.

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