FRACTURE TOUGHNESS MEASUREMENT USING NORMALIZATION TECHNIQUE

Zoeb Kaizar Lakdawala's picture

I  am a Student of 2 year M. Tech. studying in S. V. National  Institute of Technology, Surat . My name is Zoeb K Lakdawala. My topic for disseration is 'Implemenation of Fracture Mechanics on Pressure  Vessels". In my disseration I want to develop a code on fracture mechanics and compare it with standard Packages like ANSYS & ABAQUS.

Actually, In this project work i also wanted to conduct fracture toughness test using normalization technique as specified in ASTM E - 1820 using material SA 516 GR 70. I have conducted the test and prepared the specimen as per the test standard ASTM E - 1820. I have, also calculated the intial and final crack length and obtained the normalized curve of the type

PN = ( a + bvpli + cvpli^2)/(d + vpli)

Now as suggested in ASTM E-1820 one has to increased the crack length and adjust the Pni calculated such deviation would be less than 0.1%. The major difficulty which i am facing is that i cannot attend this deviation value and % deviation in my case is more than 15%.

Also I taken the load 0 to Pq as the crack will start to grow after load Pq and at Pmax,  I have obtained the final crack length

I will be most thankful to you if you suggest me few more things applicable to (and few tips how to minimize % deviation,) normalization curve technique such as some papers and related documents.

Thanking You in Anticipation,

Zoeb Kaizar Lakdawala
M. Tech (Industrial Process Equipment Design)
S. V. National Institute of Technology, Surat
Mobile : 09925207052