Kc value in RAPID material database
Kc value in RAPID material database
(OP)
Hi,
back to RAPID again.
Does anybody know the origin of the Kc=153 ksi sqr(in) tabulated in the material database of 2024-T3?
It should have something to do with the apparent fracture toughness. I can't find any clarification in the letterature.
Thanks!
back to RAPID again.
Does anybody know the origin of the Kc=153 ksi sqr(in) tabulated in the material database of 2024-T3?
It should have something to do with the apparent fracture toughness. I can't find any clarification in the letterature.
Thanks!





RE: Kc value in RAPID material database
RE: Kc value in RAPID material database
What are you trying to evaluate with this value?
Also - this is effectively a double post, please refrain from double posting per the forum policy.
RE: Kc value in RAPID material database
Kc is plane stress fracture toughness, applicable for thin sheet. in my experience 153 ksi.in^1/2 is quite reasonable.
RE: Kc value in RAPID material database
For 2024 T3 clad sheed Kc is not an user input, but it is part of the material database.
RAPID manual says that if Kc is not present, then it will be automatically calculated using the NASGRO equation Kc/KIc=1+Bk*e^-(Ak*t/t0)^2 where t0= 2.5(KIc/Fty)^2.
Using Ak and Bk =1 as per NASGRO's material table I get Kc=66 Ksi sqr(in) for a t=0.05 in.
Dear rb1957: can you substantiate you assessment with more details, please?
Dear YoungTurk: this value is taking a part in the crack growth & residual strength calculation in the RAPID software.
Thanks to all
RE: Kc value in RAPID material database