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Tensile Testing Masterclass

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To encourage closer contact between schools and Materials Science Departments. ... Ductility. Pedagogy - Masterclass. Tensile Test Specimens are broken. ... – PowerPoint PPT presentation

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Title: Tensile Testing Masterclass


1
Tensile Testing Masterclass
Martin Carr(Schools Liaison Officer)Department
of MaterialsParks Road Oxford OX1 3PHTel.
01865 273 710 EmailMartin.Carr_at_materials.ox.ac.u
k
2
Aims
  • To raise awareness of Materials Science to
    schools.
  • To encourage closer contact between schools and
    Materials Science Departments.
  • To enable schools to have access to expertise and
    equipment that is beyond the reach of most
    schools.

3
Pedagogy - Preliminary
  • Teachers should introduce Tensile Testing, strss
    strain charts and relevant terminology BEFORE
    the Masterclass.
  • Plasticine and sand Model
  • Preliminary Experiments

4
Pedagogy - Preliminary
  • Plastic behaviour of metals is modelled by the
    plastic behaviour of plastic-ine.
  • Sand mimics the effect of carbon
  • Measurements and observations can be made.
  • The Feel of the stress-strain chart.
  • Fracture surface appearance.
  • Necking.
  • Ductility.



5
Pedagogy - Masterclass
  • Tensile Test Specimens are broken. Measurements
    and Observations are made and compared to C
    content
  • increase in length
  • reduction in area
  • Microstructure
  • Hardness
  • Strength

6
Results Stress-Strain Charts
7
Results Mechanical Properties
8
Overview
  • Initial learning curve is very steep.
  • Students split into groups of about 4
  • Team work
  • Allocation of responsibilities
  • Collection of data.
  • Some, not all, students get good results.
  • Data from each group is collected at the end of
    the session and copied onto a USB memory stick
    for the teacher to take away together with
    specimen data.

9
Benefits To The School
  • Experience of working in an undergraduate
    teaching lab on a cut-down undergraduate
    experiment.
  • Interaction with student demonstrators.
  • Concrete experience of an abstract part of a
    teaching course.
  • Teacher could use data for coursework.
  • Links with the department which could be
    developed further.

10
Benefits To The Department
  • One aspect of Materials Science is highlighted.
  • Opportunity to raise awareness further
  • Links with teachers may result in more sixth
    formers considering Materials Science as a
    career.
  • Can be linked with Aspiration / Gifted and
    Talented and similar initiatives.
  • Promotes Physical Sciences and Engineering on a
    broader basis.

11
Materials Used
  • Material Supplier
  • Orchard Materials Ltd
  • Unit 7, Brunel Way
  • Thornbury Industrial Estate,
  • Thornbury
  • Bristol   BS35 3UR

Remko Iron 0.02C 080A15 0.18C 080A42 0.41C 070M
55 0.54C S202 0.82C
  • Heat Treatment in House
  • Normalise all steel in the same way
  • Heat in the furnace and hold at 860C for 1 hour.
  • Remove from furnace and air cool out of draughts.

12
Engineering Supplies
  • CNC Machining
  • Jacobs and Sons
  • Unit 6, Park Farm Industrial Estate
  • Greet
  • Gloucestershire,   GL54 5BX
  • For bulk orders, machining approx. 1.55 to 1.65
    each.
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