MET 34800 – Engineering Materials Chapter 4

MET 34800 – Engineering Materials Chapter 4...

Info icon This preview shows pages 1–15. Sign up to view the full content.

MET 34800 – ENGINEERING MATERIALS IUPUI ENGINEERING TECHNOLOGY ENT Department
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

CHAPTER 4 THE ROLE OF MECHANICAL PROPERTIES IN ENGINEERING MATERIALS Engineering Materials: properties and selection, 9th ed. Kenneth G. Budinski, Michael K. Budinski
Image of page 2
It is the purpose of this chapter to increase reader’s knowledge of mechanical properties to the point where he or she will never confuse strength for toughness, or strength for stiffness, or stiffness for hardening. Yield strength Tensile strength Hardness (various scales) Shear strength Fatigue strength Creep strength Stress rupture strength Compressive strength Maximum use temperature Fracture toughness Impact strength CHAPTER GOALS 3
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Upon completion of this chapter, the student should: have an understanding of the difference between strength and toughness have a reasonable knowledge of tensile testing and the properties that are measured with a tensile test machine know how to use mechanical properties in material selection and failure prevention CHAPTER GOALS 4
Image of page 4
The range of mechanical properties that are important in material selection Use as a material selection checklist Determine which ones relate to desired serviceability Definition of stress Types of stress Stress in a tensile bar Review units of stress: psi, ksi, Kg/mm 2 , MPa, GPa 4.1 MECHANICAL PROPERTIES 5
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Figure 4–1 Spectrum of material properties and how they apply to various material systems (physical properties apply equally to all systems) 4.1 MECHANICAL PROPERTIES 6
Image of page 6
Figure 4–2 Examples of five basic types of stress 4.1 MECHANICAL PROPERTIES 7
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Figure 4–3 Formation of tensile stresses in a mechanical component as the result of an applied load 4.1 MECHANICAL PROPERTIES 8
Image of page 8
What is tensile testing? What is it used for? How does it work? Important parts on a tensile tester: Specimen’s pulling/pushing mechanism Grips Extensometer Fixtures Type of loading Definition of elastic modulus Yield strength Tensile strength Determining percent elongation True stress and strain Poisson’s ratio 4.2 TENSILE TESTING 9
Image of page 9

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Figure 4–4 Typical universal testing machine 4.2 TENSILE TESTING 10
Image of page 10
Figure 4–5 Tensile samples 4.2 TENSILE TESTING 11
Image of page 11

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Figure 4–6 Tensile test method and the resultant data 4.2 TENSILE TESTING 12
Image of page 12
Figure 4–7 Tensile test samples before and after testing, and the measurements required to calculate the percent elongation and the reduction in area 4.2 TENSILE TESTING 13
Image of page 13

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Figure 4–8 Comparison of true and engineering stress–strain curves and the calculation of the strain-hardening exponent from true stress–strain data.
Image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern