Joao Ramos Assessment Title and Tasks: Shear Force

FACULTY of COMPUTING, ENGINEERING & SCIENCE Final mark awarded:_____ Assessment Cover Sheet and Feedback Form 2017/18 Module Code: NG1S228 Module Title: Engineering Mechanics 1 Module Lecturer: Joao Ramos Assessment Title and Tasks: Shear Force in a beam Assessment No. 1 of 1 No. of pages submitted in total including this page: Completed by student Word Count of submission (if applicable): Completed by student Date Set: Submission Date: Return Date: 23/03/18 Part A: Record of Submission (to be completed by Student) Extenuating Circumstances If there are any exceptional circumstances that may have affected your ability to undertake or submit this assignment, make sure you contact the Advice Centre on your campus prior to your submission deadline. Fit to sit policy: The University operates a fit to sit policy whereby you, in submitting or presenting yourself for an assessment, are declaring that you are fit to sit the assessment. You cannot subsequently claim that your performance in this assessment was affected by extenuating factors. Plagiarism and Unfair Practice Declaration: By submitting this assessment, you declare that it is your own work and that the sources of information and material you have used (including the internet) have been fully identified and properly acknowledged as required . Additionally, the work presented has not been submitted for any other assessment. You also understand that the Faculty reserves the right to investigate allegations of plagiarism or unfair practice which, if proven, could result in a fail in this assessment and may affect your progress. Intellectual Property and Retention of Student Work: You understand that the University will retain a copy of any assessments submitted electronically for evidence and quality assurance purposes; requests for the removal of assessments will only be considered if the work contains information that is either politically and/or commercially sensitive (as determined by the University) and where requests are made by the relevant module leader or dissertation supervisor. You are required to acknowledge that you have read the above statements by writing your student number(s) in the box: Student Number(s): IT IS YOUR RESPONSIBILITY TO KEEP RECORDS OF ALL WORK SUBMITTED   Part B: Marking and Assessment (to be completed by Module Lecturer) This assignment will be marked out of 100%. It contributes to 30% of the total module marks. Assessment Task: Shear Force in a simply supported beam Your task is to conduct a laboratory test on a simply supported beam, which consists of loading the beam with different weights placed at different positions and comparing the results to theoretical predictions achieved using the equations provided in the literature. In order to run the lab, the beam apparatus presented in Figure 1 (below) will be used: Figure 1 – HFC4 Shear Force Apparatus The lab setup consists of a simply supported articulated beam supporting three hangers. The articulated joint in the beam can be kept straight be adjusting an underslung spring and a spring balance, which mimics a shear force. The beam is loaded with different weights which will cause the spring to stretch and the beam will form a dog leg. Adjusting the springs will bring the beam back into alignment and allow a reading to be taken of shear force. Figure 2 – Detailed view of the gauge used to calculate the Shear Force in the beam Lab Guide: The recommended lab procedure is the following and should be repeated for each loading scenario: 1. Position the loads according to your preference and ensure you zero the scale when the hangers have been placed in the desired locations. If you can’t zero it, take note of the offset. 2. Load the hangers with any loads provided and record the position and size of the loads. 3. Adjust the lower spring and the vertical spring balance to bring the two parts of the beam back into alignment. Use a straight edge on the underside of the beam to check. 4. Record the force on the spring balance. 5. Repeat steps 1 to 4 with three different loading scenarios. Draft lab sheet for each experimental test (complete it by drawing a Free Body Diagram): Draft table (subject to change upon collecting the data) – more than one may be necessary Test 1 Test 2 Test 3 Test 4 Distance between both supports Spring balance reading with no added loads (datum) Position of load 1 (cm from left support) Magnitude of Load 1 (kg) Position of load 2 (cm from left support) Magnitude of Load 2 (kg) Position of load 3 (cm from left/right side) Magnitude of Load 3 (kg) Spring balance reading with load Shear force at cut (sb1-sb2)*9.81 Distance to cut in the beam After conducting the lab, you are required to write a lab report. In addition to describing the lab you conducted, a lab report should also include a comparison to theoretical analysis. In this case, solve the beam theoretically and analyse how the shear forces you calculate compares with the shear force measurement obtained in the experimental test. This will help you gauge the accuracy of the theoretical technique. The report will not be completed without including Shear Force and Bending Moment diagrams of the beams After completing the experiment and obtaining shear force values for your four load configurations, the theoretical analysis you should perform is as follows: 1. Calculate the reactions at the supports (two equations with two unknowns). 2. Prepare the shear force and bending moment equations with X=0 at the first support. 3. Prepare Shear Force and Bending Moment Diagrams and present them in your work. 4. Compare the results from theory with the results attained in the lab. 5. Consider and evaluate possible sources of error in the experimental procedure. 6. Comment on your results by cross-matching with data from other sources (books, scientific articles, etc…) When you first sit down to start writing your lab report, you tend to start writing at the experimental procedure. However, an Introduction and Background theory are essential in order to show that you understand the principle of the experiment. The following guide may help you structure your report: 1. Title Page 2. Abstract – A summary of a technical report briefly summarizes the report. It should describe motivations, methods, results, and conclusions. Be concise in the abstract. Think of an abstract as a one-paragraph summary of the report. (Abstract – before the table of contents, Summary – after the table of contents) 3. Table of Contents 4. Introduction – The introduction of a technical report represents the subject, the purpose, and the plan of the development of your report. Writing the introduction, you should keep in mind that your main aim is to introduce your readers to the problem that you are setting out to solve in the course of your technical report. It is important to highlight the aims and objectives of the experiment. 5. Background Theory – This section includes some brief background information to get your readers acquainted with the concepts/theories relating to the experiments. 6. Experimental Procedure and Equipment – This is the section where details of the experiments (including its procedures) are outlined. Think of experimental details section as a recipe in a cookbook. The description must contain enough details to enable someone else to duplicate the experiment. 7. Results – this is where the results of the experiment are reported and any calculations presented. 8. Discussion – This is where findings and results are discussed. Any significance in the results must be made clear by detailed analysis and discussions. Any discrepancies should be discussed. 9. Conclusions – Conclude what was presented in the Results and Discussion sections. Do not conclude anything that had not been discussed. Think of the conclusion as a short restatement of important findings from the experiment. 10. Recommendations – how could the experiment be improved? 11. References and Appendices When preparing your analysis, you are free to
make assumptions. However all assumptions must be clearly stated and justified in your report. You are expected to do additional research and reading as part of this assignment. All source material must be referenced according to the Harvard Referencing system. (suggested length: 1500 words) Learning Outcomes to be assessed (as specified in the validated module descriptor https://icis.southwales.ac.uk/ ): 1. Demonstrate an understanding and the ability to solve problems in simple static and dynamic or structural systems using experimental analysis 2. Demonstrate an understanding of the fundamental concepts in static and dynamic and solve basic engineering problems Marking Criteria Max Grade Marks Rationale Presentation, Structure and Referencing 10 7-10 (1st) A perfectly presented assignment, following a logical structure and with referencing done correctly. 6 (2:1) A well-presented document, but with some minor faults that do not put into cause the integrity of the document. 5 (2:2) A document that is readable and contains some referencing, but not in a logical fashion. 4 (3rd) A poorly organised document, where information is not organised in a logical manner or without referencing 0-3 (Fail) An unorganised document, where information does not follow a logical procedure. Clarity of Aims and Objectives 10 7-10 (1st) Aims and objectives properly presented and explained. 6 (2:1) Aims and objectives properly presented and explained, however some minor fault prevents it from being 1st class. 5 (2:2) Aims and objectives presented but not well explained or explained but not clearly. 4 (3rd) Aims and objectives presented but not explained. 0-3 (Fail) Aims and objectives not present or unrelated to the topic studied. Knowledge of Theory 20 14-20 (1st) The document shows a deep understanding of the theory and how it applies to the problem at hand. 12-13 (2:1) The theory is well understood, but not to the depth of the 1st class student. 10-11 (2:2) Shows a good understanding of the theory but some difficulty in explaining how it applies to the problem. 8-9 (3rd) The student shows some understanding of the theory and has difficulty applying it to the problem. 0-7 (Fail) No understanding of theory or how it applies to the problem. Results and Calculations 40 28-40 (1st) The calculations are on-point, the assumptions are perfectly acceptable and an overall attention to detail is shown. 24-27 (2:1) The calculations are correct but some assumptions may not be mentioned. 20-23 (2:2) Some minor calculations which do not affect the conclusions of the present work may be wrong. 16-19 (3rd) Some assumptions may be wrong, thus affecting the integrity of the project but the calculations are still correct. 0-15 (Fail) The majority of the calculations and assumptions are wrong, which directly affects the integrity of the document and its conclusions. Discussion and Conclusions 20 14-20 (1st) The discussion leads into the conclusion in a logical manner and the objectives are answered. Particular attention is given to the comparison between theory and practice 12-13 (2:1) The discussion and the conclusion are both excellent, but some small omissions may keep them from being considered 1st class. 10-11 (2:2) A good discussion and conclusion. Some objectives may not have been addressed. 8-9 (3rd) A discussion and conclusion that still require a little bit more work, taking into account the work done. 0-7 (Fail) A discussion that does not have any reference to the work conducted or a conclusion that does not address the objectives. Total Mark:   Feedback/feed-forward (linked to assessment criteria): • Areas where you have done well: • Feedback from this assessment to help you to improve future assessments: • Other comments Mark: Marker’s Signature: Date: Work on this module has been marked, double marked/moderated in line with USW procedures. Provisional mark only: subject to change and/or confirmation by the Assessment Board   Part C: Reflections on Assessment (to be completed by student – optional) Use of previous feedback: In this assessment, I have taken/took note of the following points in feedback on previous work: Please indicate which of the following you feel/felt applies/applied to your submitted work • A reasonable attempt. I could have developed some of the sections further. • A good attempt, displaying my understanding and learning, with analysis in some parts. • A very good attempt. The work demonstrates my clear understanding of the learning supported by relevant literature and scholarly work with good analysis and evaluation. • An excellent attempt, with clear application of literature and scholarly work, demonstrating significant analysis and evaluation. What I found most difficult about this assessment: The areas where I would value/would have valued feedback:   Notes:

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