ShearCentre

Topics: Shear stress, Force, Second moment of area Pages: 29 (1782 words) Published: February 22, 2014
ENGG209
Solids and Structures 2
Lecture 1 Introduction
Shear Centre

Dr Schleyer

Overview of this lecture









Lecture rules
Schedule
Assessment
Syllabus (Sem. 1)
Objectives
Labs
Revision
Shear of open section beams

Lecture Rules
1. Start promptly
2. Come prepared

3. Listen carefully
4. Behave respectfully

The module (ENGG209)





15 credit module – whole session
Lectures weekly: Tuesday 1.30-3pm (Sem. 1)
Dr Schleyer (Sem. 1) / Prof. Beer (Sem. 2)
Labs A1 (Civil only), WP, CT (Sem. 1) / STR1 (Sem.
2): per lab schedule start week 2
• Workshop practice (WP): per lab schedule starts
week 1 (AE & ME only)
• Self-study using lecture slides, questions and
recommended text books
• Notes on VITAL

Labs (Sem. 1)
• A1: Shear centre of a channel section (Civil)
– Pre-lab exercise to complete before the lab

• WP/CT: Workshop Practice / Crashbox
Testing (Aero, Mech, Engg, Mats)
– Workshop safety test to pass

Assessment
• 15 credit module
– Written MCQ exam (May): 90%
– Labs: 10%

Recommended text books (Sem. 1)
Benham, Crawford & Armstrong
Mechanics of Engineering Materials,
2e

Hibbeler
Mechanics of Materials, 8e SI Ed

Syllabus 2013-14 (Sem. 1)
Week Date

Topic

Lecturer

1

24 Sep

Intro / Revision of basic concepts / Shear centre

Schleyer

2

01 Oct

Shear of beams and thin-walled open members

Schleyer

3

08 Oct

Structural impact

Schleyer

4

15 Oct

Energy methods – 1

Schleyer

5

22 Oct

Energy methods – 2

Schleyer

6

29 Oct

Careers & Employability

-

7

05 Nov

Pin-jointed frames – 1

Schleyer

8

12 Nov

Pin-jointed frames – 2

Schleyer

9

19 Nov

Principal stresses / Mohr circle

Schleyer

10

26 Nov

Yield criteria

Schleyer

11

03 Dec

Revision

Schleyer

12

10 Dec

Revision

Schleyer

Objectives of this module
• To study equilibrium and displacement systems in
engineering components and structures to enable safe
designs to be produced in terms of stress and strain,
deflections and the selection of suitable materials.
• In particular, the behaviour of typical structural members and elastic systems found in aerospace, civil and mechanical engineering will be studied e.g. pin-jointed frames, thinwalled open sections

• Build on year 1 concepts and understanding
• Introduce new techniques for solving problems i.e. energy methods

Year 1 Key concepts








Types of load action – axial, torsion, bending, shear
Equilibrium
Stress and strain
Poisson’s ratio
Free body diagrams
Tracking the load through a structure
Shear force & bending moment diagrams

Applications of thin-walled
members

Automotive crumple zone
Aircraft wing box

Steel
construction

Workshop Practice (AE, ME, Eng, Mats)
• To provide practical ‘hands-on’ workshop
experience
• To appreciate skills required in manufacturing
• To undertake a mini design-make-test project
in lab groups
• To satisfy accreditation requirements

Workshop Practice Pre-Lab exercise





On Vital (‘Workshop Practice’ folder)
Basic Machinery Safety presentation
Fabrication presentation
Video to watch
– only with Internet Explorer browser

• Test (>70%)
– Allowed to do WP lab

Safety Shoes
• Students must wear safety shoes and lab
coats
• You will be turned away if you don’t have
them
• Safety glasses and guided instruction will be
provided

Project
• To make and test a steel crash
box that is fit-for-purpose
• To work with engineering
drawings
• To use different methods of
joining (bolting, pop riveting
and spot welding) in the
manufacturing process
• To consider parameters that
affect cost, performance,
quality, safety and reliability

Top-hat section crash box

Manufacture








Marking out
Cutting
Bending
Drilling
Fastening
Welding
Assembling

Design...
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