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Re: Brittle and Ductile steel elements

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On Jun 11, 2008, at 3:15 PM, Jnapd(--nospam--at) wrote:

In regard to anchors embedded in concrete ACI 318 App D regarding Brittle and Ductile steel elements Is it correct to assume if the Fu of the bolt is 65ksi or less then it is Ductile and over 65ksi is Brittle ??
No. You really need to know more about the material characteristics. I don't know what the Code says maybe they have their own definition of ductile and brittle, but UTS alone doesn't determine brittle behavior. In carbon steels brittle behavior is strongly temperature dependent, but that depends on processing variables. Carbon and manganese content also have a strong effect. Carbon content over 0.45% makes for more brittle behavior as does manganese content below about 0.60%. Quenched and tempered steel is more brittle than annealed material of the same chemistry. It's not a topic with a few quick rules of thumb.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)

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