ENGR-45_Lec-30A_Final_Exam-Review.pptl.ppt1

Bruce Mayer, PE Engineering-45: Materials of Engineering

Bruce Mayer, PELicensed Electrical & Mechanical Engineer

BMayer@ChabotCollege.edu

Engineering 45

FinalExamReview

ENGR-45_Lec-30A_Final_Exam-Review.pptl.ppt2

Bruce Mayer, PE Engineering-45: Materials of Engineering

P13.14 Advice

The Following Problem is Very SIMILAR to Problem 13.14, but it is NOT the Same

The Numbers were Changed to Protect the Innocent

ENGR-45_Lec-30A_Final_Exam-Review.pptl.ppt3

Bruce Mayer, PE Engineering-45: Materials of Engineering

Problem 13.14 SetUp

Problem → SodaLime Glass

(SLG) Loaded as Shown at Right

Find Using Fig 13.7 the Max-Temperature if the allowed extension is 1mm over the course of a week’s time

1N

1 N

SLG

100 mm

5 mm

ENGR-45_Lec-30A_Final_Exam-Review.pptl.ppt4

Bruce Mayer, PE Engineering-45: Materials of Engineering

Use the η – ε – σ Reln

The Viscosity Reln

dtd

Where• η ≡ Viscosity• σ ≡ Tensile Stress• ε ≡ Tensile Strain

ENGR-45_Lec-30A_Final_Exam-Review.pptl.ppt5

Bruce Mayer, PE Engineering-45: Materials of Engineering

ENGR-45_Lec-30A_Final_Exam-Review.pptl.ppt6

Bruce Mayer, PE Engineering-45: Materials of Engineering

Use Fig 13.7

490 °C

Thus at η = 3.08x1012 Pa•S:

T = 490 °C

ENGR-45_Lec-30A_Final_Exam-Review.pptl.ppt7

Bruce Mayer, PE Engineering-45: Materials of Engineering

P14.25 Advice

The Follow Problem is Very SIMILAR to Problem 14.25, but it is NOT the Same

The Numbers were Changed to Protect the Innocent

ENGR-45_Lec-30A_Final_Exam-Review.pptl.ppt8

Bruce Mayer, PE Engineering-45: Materials of Engineering

ENGR-45_Lec-30A_Final_Exam-Review.pptl.ppt9

Bruce Mayer, PE Engineering-45: Materials of Engineering

ENGR-45_Lec-30A_Final_Exam-Review.pptl.ppt10

Bruce Mayer, PE Engineering-45: Materials of Engineering