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MATERIAL SCIENCE
Web: www.amiestudycircle.com     Ph/WA: +91 9412903929       1/2 
AMIE(I) STUDY CIRCLE(REGD.)
STUDY MATERIAL FOR AMIE EXAMS
Example (AMIE S08, 14, W19, 5 marks)
A sample of glass has a crack of half length 2 m. The Young’s
modulus of the glass is 70 GNm-2
and the specific surface energy is 1
Jm-2
. Estimate its fracture strength.
MATERIAL SCIENCE
Web: www.amiestudycircle.com     Ph/WA: +91 9412903929       2/2 
AMIE(I) STUDY CIRCLE(REGD.)
STUDY MATERIAL FOR AMIE EXAMS
Solution
The formula for critical fracture stress is
s
2 Y
c

 

where  is surface energy per unit area.
Putting values
9
2
f 6
2x1x 70x10
150MNm
3.14x 2x10


  

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