Undergraduate Teaching

Engineering Tripos Part IA, 1P2: Materials, 2020-21

Engineering Tripos Part IA, 1P2: Materials, 2020-21

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Course Leader (M, L)

Dr H Shercliff

Course Leader (E)

Dr A Markaki

Lecturer

Dr H Shercliff

Lecturer

Dr A Markaki

Lecturer

Dr S Huang

Timing and Structure

Michaelmas/Christmas vacation (provisional): 1 lecture, plus 2 online only; Lent: 7 lectures (1 per week, plus 2 online only); Easter: 8 lectures (2 or 3 per week)

Prerequisites

Preparatory Problems: Materials

Aims

The aims of the course are to:

  • Introduce the material properties and failure mechanisms most relevant to mechanical design and engineering applications.
  • Relate properties to atomic, molecular and microstructural features, using appropriate mathematical models.
  • Enable analysis of material performance in mechanical design, including strategies for material and process selection

Objectives

As specific objectives, by the end of the course students should be able to:

  • Understand the purposes of modelling the elastic-plastic deformation responses of materials
  • Define the main mechanical properties of materials and how they are measured experimentally
  • Analyse the stress-strain response of simple geometries under uniform mechanical and thermal loads, distinguishing between true and nominal stress and strain
  • Describe the atomic and microstructural characteristics which control the mechanical properties of engineering materials, and to interpret material property charts
  • Explain briefly the origin of the elastic modulus for each class of engineering materials (metals, ceramics, polymers) and analyse the moduli of composites
  • Describe the mechanisms for plastic flow in metals, and the ways in which the strength can be enhanced via composition and processing
  • Understand a systematic strategy for materials selection for a given component, and use the Cambridge Engineering Selector software to find material data and select materials
  • Choose materials from material property charts using simple calculations (e.g. stiffness and strength of beams at minimum weight)
  • Choose primary shaping process from process attribute charts, and estimate the cost of manufacture for batch processing
  • Understand the environmental impact of materials in the life cycle of products
  • Describe the mechanisms of fracture and fatigue in each class of engineering materials
  • Apply fracture mechanics analysis to design against fracture in metals, and Weibull failure statistics for design in ceramics
  • Describe and model fatigue failure in design with metals
  • Analyse the visco-elastic response of polymers, for both static and cyclic loading
  • Briefly describe the mechanisms of friction and wear in engineering

Content

Introduction (1L, Dr H.R. Shercliff)

Classes of engineering materials and their applications; material properties and overview of microstructural length-scales. (1) Chap. 1,2; (2) Chap. 30; (3) Chap. 27

Introductory Solid Mechanics: Elastic and Plastic Properties of Materials (2L online + 1L, Dr H.R. Shercliff)

  • Introductory solid mechanics (online / teach yourself): elasticity/plasticity in design and manufacture; elastic and plastic properties: definition and measurement - Young's modulus, yield strength, tensile strength, ductility and hardness; mechanical property data and material property charts;  Hooke's Law and 3D stress-strain;  nominal and true stress and strain. (1) Chap. 4,6; (2) Chap. 3,7,8,11,12,31; (3) Chap. 4-6; (4) Chap. 7
  • Analysis of stress and strain: constrained deformation, thermal stress. (1) Chap. 4,12; (2) Chap. 3; (4) Chap. 7

Microstructural Origin and Manipulation of Material Properties (4L + online "Guided Learning Unit", Dr H.R. Shercliff)

  • Introduction to microstructure and crystallography (online "teach yourself" Guided Learning Unit).  (1) GLU1.
  • Physical basis of elastic modulus and density: atomic/molecular structure and bonding. (1) Chap. 4; (2) Chap. 4-6; (4) Chap. 2-4
  • Microstructual origin and manipulation of elastic properties: foams and composites. (1) Chap. 4; (2) Chap. 6
  • Physical basis of plasticity and yielding: ideal strength, dislocations in metals; failure of polymers. (1) Chap. 6; (2) Chap. 9; (4) Chap. 8
  • Microstructural orgin and manipulating plastic properties: strengthening mechanisms in metals. (1) Chap. 6,19; (2) Chap. 10; (4) Chap. 8,12

Material and Process Selection, and Environmental Impact in Design (2L + 2L online, Dr H.R. Shercliff)

  • Material selection in design; stiffness-limited and strength-limited component design (online / teach yourself). (1) Chap. 2,3,5,7; (2) Chap. 3,7; (4) Chap. 7
  • Further material selection:  effect of shape, and multiple constraints.  (1) Chap. 5,7
  • Environmental impact and life cycle analysis of materials. (1) Chap. 20
  • Selection of manufacturing process and cost estimation for batch processes (online / teach yourself). (1) Chap. 18

Fracture and Fatigue of Materials (4L, Dr A.E. Markaki)

  • Toughness, fracture toughness and fatigue fracture.
  • Micromechanisms of brittle and ductile fracture, and of fatigue, in metals.
  • Analysis of fracture and fatigue in design.
  • Weibull statistics for ceramic fracture.

         (1) Chap. 8-10; (2) Chap. 13-19; (3) Chap. 18,23; (4) Chap. 9

Viscoelasticity and Wear of Materials (4L, Dr S Huang)

  • Constitutive modelling of materials deformation.
  • Elasticity and viscoelasticity.
  • Case studies.
  • Micromechanisms of friction and wear in materials.

         (1) Chap. 11

REFERENCES

(1) ASHBY, M., SHERCLIFF, H. & CEBON, D. MATERIALS: ENGINEERING, SCIENCE, PROCESSING AND DESIGN (3rd or 4th edition)
(2) ASHBY, M.F. & JONES, D.R.H ENGINEERING MATERIALS 1
(3) ASHBY, M.F. & JONES, D.R.H ENGINEERING MATERIALS 2
(4) CALLISTER, W.D. MATERIALS SCIENCE & ENGINEERING: AN INTRODUCTION

Booklists

Please refer to the Booklist for Part IA Courses for references to this module, this can be found on the associated Moodle course.

Examination Guidelines

Please refer to Form & conduct of the examinations.

UK-SPEC

The UK Standard for Professional Engineering Competence (UK-SPEC) describes the requirements that have to be met in order to become a Chartered Engineer, and gives examples of ways of doing this.

UK-SPEC is published by the Engineering Council on behalf of the UK engineering profession. The standard has been developed, and is regularly updated, by panels representing professional engineering institutions, employers and engineering educators. Of particular relevance here is the 'Accreditation of Higher Education Programmes' (AHEP) document which sets out the standard for degree accreditation.

The Output Standards Matrices indicate where each of the Output Criteria as specified in the AHEP 3rd edition document is addressed within the Engineering and Manufacturing Engineering Triposes.

Last modified: 26/08/2020 09:17