010709-Ch2

010709-Ch2 - 1 92-411 Machine Design Winter 2009 Department...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 92-411 Machine Design Winter 2009 Department of Mechanical, Automotive, and Materials Engineering 92-411: Machine Design I 2 Chapter 2: Materials | Selection of part material and manufacturing process is the responsibility of the design engineer z Selection usually made before part dimensions are established z Material properties are necessary for estimating part stress and deflection z Other factors: aesthetics, corrosion, temperature 92-411: Machine Design I Figure 2-1 3 Chapter 2: Materials | Standard tensile test determines material characteristics 2 : strain normal , 4 1 : stress l l l d P A P = = = 92-411: Machine Design I Figure 2-2 4 Chapter 2: Materials | Plot resulting stress-strain relationship Ductile Brittle 2 92-411: Machine Design I Figure 2-2 5 Chapter 2: Materials | pl: proportional limit | el: elastic limit | y: yield point | u: point of ultimate strength | f: fracture point 92-411: Machine Design I Figure 2-3 6 Chapter 2: Materials | Engineering stress , , and engineering strain , , are calculated with original dimensions z Lower than true values | True stress , t , and true strain , t , are calculated with current dimensions z True strain (logarithmic strain): = = l l t l l l dl ln 92-411: Machine Design I Figure 2-4 7 Chapter 2: Materials t- t diagram Note that the true value of f > u , unlike S f < S u in Figure 2-2 92-411: Machine Design I 8 Chapter 2: Materials | Compressive tests use samples of a different geometry because of buckling and to more evenly distribute the stresses | Usually, compressive and tensile...
View Full Document

This note was uploaded on 09/19/2009 for the course ME 416 taught by Professor Kauzmania during the Spring '09 term at Windsor.

Page1 / 8

010709-Ch2 - 1 92-411 Machine Design Winter 2009 Department...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online