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CECE 2210 American Academy of English Mechanics of Materials Questions

CECE 2210

American Academy of English

CECE

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May 10, 2020 CECE2210 – MECHANICS OF MATERIALS ‫الكلية التقنية بشناص‬ Shinas College of Technology FINAL ASSESSMENT (ASSIGNMENT) AY 2019-2020 - SEMESTER- II ENGINEERING DEPARTMENT ‫تعلـــــيمات للطــــــلبة‬ INSTRUCTIONS TO STUDENTS • The student must personally answer the assignment questions and submit it electronically through the Word document. • The assignment should be uploaded on the e-learning. • The e-learning submission platform will be closed as per the due date and time. • The final submitted assignment within the 48 hours period will be considered as final (Maximum number of submissions is 3). • The maximum acceptable level of similarity is 25%. ‫• يجب حل االتقييم من قبل الطالب شخصيا ويكون إلكترونيًا باستخدام برنامج‬ .Word .e-learning ‫• يجب تحميل إجابات التقييم على منصة التعليم اإللكتروني‬ ‫ ساعة) من بداية الوقت المحدد للتقييم‬48( ‫• سيتم غلق منصة التسليم بعد‬ .‫النهائي‬ 3 ‫ وبحد أقصى‬،‫ ساعة‬48 ‫• سيتم اعتماد آخر تسليم قدمه الطالب خالل فترة الـ‬ .‫مرات‬ .%25 ‫• الحد األقصى المسموح به للتشابه هو‬ ‫• في حالة وجود تطابق بين طالبين او أكثر في حل الواجب الدراسي سوف يعطى‬ • In case of duplicated assignments between two students or more, a zero mark will be given and the case will be investigated. ‫ ) من‬80 ( ‫الطالبان صفر و سيتم إحالتهما الى لجنة التحقيق و ذلك وفقا للمادة‬ • Illegal programs or methods used to conceal similarities are prohibited and students will be investigated. • References must be documented properly. • It is prohibited to share the assignment with anyone or any form. Violators will be sanctioned as per the college policies. This Final Assessment is CONFIDENTIAL. .‫قانونية وفي حالة اكتشاف ذلك ستطبق على الطالب األنظمة المتبعة في ذلك‬ 1 .‫اللوائح الداخلية للكليات التقنية‬ ‫• يحظر على الطالب استخدام أي برامج أو طرق تخفي نسبة التشابة بطريقة غير‬ .‫• يجب على الطالب كتابة المراجع المستخدمة‬ ‫ منصة‬/‫• يحظر مشاركة التقييم النهائي بأي شكل من األشكال مع أي شخص‬ ‫وسيتم معاقبة المخالفين وفقًا لسياسات الكلية (هذا التقييم النهائي سري وملك‬ .)‫للكلية‬ May 10, 2020 Question Number Q1 Q2 Q3 Q4 Q5 Total CECE2210 – MECHANICS OF MATERIALS Marks 8 Marks 8 Marks 8 Marks 8 Marks 8 Marks 40 Marks Q1: Buckling strength was evaluated for two hollow columns, one made up of steel and the other concrete both having external diameter 45 mm and thickness 25 mm. Length of the steel column used is 3 times more than that of the concrete column. When both of the columns are subjected to a same compressive stress of 0.0120 MN/cm2, steel column shortens by 4.6 mm but the concrete column shortens by 6.5 mm. Predict the values for the length of the columns and the safe buckling load if both ends of the column was considered to be fixed. Consider a factor of safety equal to 4 and Young’s modulus, E(steel) = 210 GPa. Experiments were repeated for two other solid columns made up of steel and concrete having material properties similar to that of the two hollow columns. If the length of both solid columns are equal to 3.5 m and when one end of the column is fixed but other end free, the magnitude of the buckling load was observed to be 230 MN. Suggest a suitable diameter for both steel and concrete columns based on the given loading conditions. Conclude the results obtained for the buckling strength of steel and concrete columns. (8 marks) Q2: Three steel plates each having thickness 1.2 cm and width 6 cm are joined by using two rivets having diameter 15 mm each. When the plates are subjected to an external force of 65 MN, what will be the shear stress developed in the rivet? If the ultimate shear strength on the rivet is limited to 1500 tonnes/cm2, what will be the maximum load that can be carried by the plate? Instead of three plates, if two steel plates each having 1.2 cm thickness and 6 cm width are joined by using rivets having diameter 20 mm and when subjected to a force of 106 MN, shear stress developed in the rivet was found to be 600 tonnes/cm2. What will be number of rivets required for joining the plates to withstand the shear force? Compare the nature of shear occurred in both cases with the help of a diagram. (8 marks) Q3: Bending moment and shear force diagrams were plotted for a cantilever beam of span 10 m when subjected to a uniformly distributed load of magnitude ‘w’ kN/m over the entire span, two concentrated loads ‘2w’ kN at a distance 3 m from the free end and ‘3.5w’ kN at a distance 4.5 m from the free end respectively. It was observed that the value for maximum bending moment acting on the beam is equal to (-175 kNm). Suggest a suitable value for ‘w’ based on the given data. How it will change the reaction at the support, shear force and bending moment values? By plotting bending moment and shear force diagram for the beam briefly conclude the relationship between the values for shear force and bending moment. (8 marks) 2 May 10, 2020 CECE2210 – MECHANICS OF MATERIALS Q4: A solid bar is having uniform cross section 15 mm x 15 mm throughout the length and is made up of a material having shear modulus equal to 0.1165 x 104 kN/cm2. When the bar is subjected to a tensile force of magnitude 19000 N, the changes in the lateral dimensions of the bar was found to be 14.885 mm x 14.885 mm. Identify the elastic properties and determine the value for the Young’s modulus of the material. What changes will happen to the volume of the bar due to the applied tensile force and by considering the length of the bar equal to 3.75 m? Conclude the relationship between various elastic constants for the solid bar based on the results obtained. (8 marks) Q5: Experiments were conducted to determine the deflection on a T- section steel girder 200 mm x 200 mm x 10 mm and a rectangular beam made up of concrete having breadth 15 cm and depth equal to 25 cm. T- section girder is used as a simply supported beam for a span of 4 meters but rectangular beam is used as a cantilever beam for span of 6 meters. Both beams are subjected to a uniformly distributed load ‘w’ N/mm run over the entire span. Suggest a suitable value for ‘w’ so that the maximum deflection in the simply supported beam does not exceed 17.65 mm. Compare the maximum value of slope and deflection for both steel and concrete beams. Modulus of Elasticity, E for steel = 2 x 107 N/cm2, E for concrete = 2.5 x 107 kg/cm2. What will be your suggestions to minimize the deflection on both steel and concrete beams based on the results obtained for the slope and the deflection of beams. (8 marks) End of Questions 3 ...
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Q1: Buckling strength was evaluated for two hollow columns, one made up of steel and
the other concrete both having external diameter 45 mm and thickness 25 mm. Length
of the steel column used is 3 times more than that of the concrete column. When both of
the columns are subjected to a same compressive stress of 0.0120 MN/cm2, steel
column shortens by 4.6 mm but the concrete column shortens by 6.5 mm. Predict the
values for the length of the columns and the safe buckling load if both ends of the
column was considered to be fixed. Consider a factor of safety equal to 4 and Young’s
modulus, E(steel) = 210 GPa.
Experiments were repeated for two other solid columns made up of steel and concrete
having material properties similar to that of the two hollow columns. If the length of
both solid columns are equal to 3.5 m and when one end of the col...

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