Materials Engineering Concepts 50 Chapter 1 ng for a total of 2 hours and produc
ID: 1711328 • Letter: M
Question
Materials Engineering Concepts 50 Chapter 1 ng for a total of 2 hours and produced the during loading and unloadi shown in Table P1.29 e strain a. Using a spreadsheet program, plot the stress versus time and the b. How much is the elastic strain? c. What is the permanent strain at the end of the experiment? d. What is the phenomenon of the change of specimen height during static versus time on two separate graphs. loading called? What is the phenomenon of the change of specimen height during unloading called? TABLE P1.29 Specimen Height, Specimen Height, Time, minutes inches 6.0000 5.9916 5.9870 5.9833 5.9796 5.9753 5.9725 5.9708 5.9696 5.9688 Time, minutes inches 5.9772 5.9807 5.9841 5.9879 5.9926 5.9942 5.9954 5.9959 5.9964 60.01 0.01 10 20 30 40 50 60 62 65 70 80 90 100 110 120Explanation / Answer
strain is calculated by below formula
e =change in length/original length
and stress = youngs modulus*strain
a.strian vs time graph is draw below from excel from above given data
as same way stress time graph is drawn
c. permanent strain is strain at 120 min i.e (6-5.9964)/6=0.0006
d.phenomenon of change of specimen height during loading is called "creep"
and during unloading is called "recovery".