Question

True or false (The fracture toughness of a material increases with increasing temperature. ) 2/ ....

True or false (The fracture toughness of a material increases with increasing temperature. )

2/ . Creep can be best described as:
A/fast elongation under high load at elevated temperature
B/ slow elongation under high load at elevated temperature
C/ fast elongation under low load at elevated temperature
D- slow elongation under low load at elevated temperature
e/ fast elongation under impact load at elevated temperature

Engineering   Mechanical-Engineering   
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Homework Answers

Answer #1

1. True

Explanation- At low temperatures the material is more brittle and fracture toughness is low. At high temperatures the material is more ductile and fracture toughness is more.

2 Ans- B) slow elongation under high load at elevated temperature

Explanation- creep is the tendency of a solid material to deform permanently under the influence of high stresses at elevated temperature. Creep deformation doesn't occur suddenly upon the application of stresses. Instead, strain accumulates as a long term stresses.

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