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Calculate maximum allowable stress 
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#1
Sep611, 07:28 AM

P: 52

1. A decision has been made to make a plate out of an advanced engineering material ceramic that has better high temperature and wear properties than alloys. The plate must withstand a tensile load of 177.92kN. The part will be nondestructively tested to ensure that no flaws are present that might cause failure. A company offers nondestructive testing methods using xray radiology that can detect flaws larger than 0.05 cm. Assume Y=1.0. Determine the minimum thickness for a 7.5mm wide plate made of sialon (Kic = 9.9 Mpa[itex]\sqrt{}m[/itex]) . Also calculate the maximum allowable design stress.
2. Kic = Y*[itex]\sigma[/itex]*sqrt{[itex]\pi[/itex]*a} [itex]\sigma[/itex] _{allowable} = FORCE/AREA 3. I just don't see how to factor in the 'thickness' into my calculations and so i cannot begin with my calculations. Can someone help me with this please. 


#2
Sep611, 02:53 PM

P: 688

Stress in a plate is a different than the direct tension formula you listed.
Have a look at: http://www.efunda.com/formulae/solid...study_list.cfm 


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