lecture17

# lecture17 - Date: 09.12.2009, Wednesday Prepared by: Özge...

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Unformatted text preview: Date: 09.12.2009, Wednesday Prepared by: Özge Ekincioğlu FAILURE CRITERIA Elasticity(3-D) Material(uniaxial exps) 1 2 3 4 NO FLAWS IN THE MATERIAL WITH FLAWS Example: (An edge crack on aircraft panel) w= 100mm t= 16mm Al 7075-1735 I = 31MPa = 392MPa Estimate the maximum load P that can be applied without causing sudden fracture when on edge crack grows to length of a=20mm. β ( = 0.2)= 1.37 = 31 MPa   QUIZ Ti-6Al-6V w= 60mm P= 160kN crack length= 18mm N= 2.5 Central transverse crack. Calculate the thickness t required to prevent sudden fracture. β ( = 0.15)= 1.02    is satisfied.   Calculating stress intensity factors using finite element analysis For solids with a complicated geometry, finite element methods (or boundary element methods) are the only way to calculate stress intensity factors. It is conceptually very straightforward to calculate stress intensities using finite elements – you just need to solve a routine linear elastic boundary value problem to determine the stress field in the solid, and then deduce the stress intensity factors by taking...
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## This note was uploaded on 02/28/2011 for the course AEE 361 taught by Professor Daglas during the Spring '11 term at College of E&ME, NUST.

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lecture17 - Date: 09.12.2009, Wednesday Prepared by: Özge...

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