2010-09-10T00:54:36-07:00 http://www.materialsforum.com/ Lussumo Vanilla http://www.materialsforum.com/discussion/138/?Focus=211#Comment_211 2009-07-23T19:51:17-07:00 2010-09-10T00:54:36-07:00 justastudent http://www.materialsforum.com/account/326/

Can a kind soul help me out with this: QUESTION A large structural girder has a through the thickness crack of 15mm. If the fracture toughness is 60MN m(-3/2). What service stress would you ...

QUESTION

A large structural girder has a through the thickness crack of 15mm. If the fracture toughness is 60MN m(-3/2). What service stress would you recommend? Explain any assumptions on which your calculation is based.]]> http://www.materialsforum.com/discussion/138/?Focus=284#Comment_284 2010-04-05T07:40:02-07:00 2010-09-10T00:54:36-07:00 pipemetallurgy http://www.materialsforum.com/account/412/

Base on stress intensity factor or strain energy release you can calculate service stress; but you need to have other parameters like type of loading; material property & temp. In above example ...

In above example if we assume uniaxial tensile loading @ 25 deg-C then service stress can be calculated as follow.
Service stress= 60/ (3.14*15*10-3)1/2
Service stress < 276 MN]]>