Question

7. The firure below shows Vickers hardness impression in garnet. The indentation Soad ws 069 N In Lecture 11, you learn how the hardness, is related to the yield strength (a) Using the 6 um sale marker to measure dimensions, estimate the beness of net and hence its yield strength (2.4 GP, 800 MPa) b) Indentation can also be used to estimate the fracture ohness of a material the cracks stop growing when the stress t asty factor drops to The following equation relates the crack leath I, the indentation site, and the hardness, H. to the fracture toughness -0.16 Hd. where, c d Estimate Kfor garnet ΟΙ ΔΡα)

Answer 1

The second part of the question is not completely answered because equation is not clear in the question. However, all quantities needed for answering it are calculated in the answer.