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Tension Strength of BOLT

03/07/2012 7:03 PM

I found means of bolts code A4-70, thats mean bolt have tension strenght 700MPa, yield strenght 450 MPa,

now, I want to know, Why tension strenght of bolt better than yield strenght of bolt,likes olt A4-70 above??

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#1

Re: Tension Strength of BOLT

03/07/2012 8:21 PM

I don't know. Let us know when you figure it out.

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#2

Re: Tension Strength of BOLT

03/07/2012 8:49 PM

"Tension strength" is the load at which the bolt will break. "Yield strength" is the value at which the bolt will start to deform. So, when you start loading the bolt it will start deforming at 450MPa and will break at 700MPa. Hope this helps.

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#4
In reply to #2

Re: Tension Strength of BOLT

03/08/2012 3:37 AM

If you see the sress-strain diagrame, you will find that small amount of plastic deformation happens at lower load then actual tensile strength of the material, which increases after this plastic difformation due to strain hardening. However material fails at considerable lower load but at very high value of strain. At tensile stregnth material is not suppose to fail but at this load, plastic deformation starts set in.

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#3

Re: Tension Strength of BOLT

03/07/2012 9:08 PM

This does not seem hard to understand. Here is a question for you: "Why would a bolt NOT deform (albeit perhaps imperceptibly) before it breaks?"

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#5
In reply to #3

Re: Tension Strength of BOLT

03/08/2012 5:02 AM

Er, if it were made of a brittle, inappropriate material?

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#7
In reply to #5

Re: Tension Strength of BOLT

03/08/2012 11:35 PM

Inappropriate how, private?

Even so, tension strength would equal yield strength; it would not be less.

Think about it, princess!

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#6
In reply to #3

Re: Tension Strength of BOLT

03/08/2012 9:21 AM

I was working at a refinery in the early sixties and there was a rash of bolts being broken by the pipe fitters. They complained to the distributor and he exploded, "I told you that you must use a torque wrench with these bolts. But you knew better didn't you" (I have understated his actual words). It turned out that this problem was not unusual, in tests they found out that with normal steel bolts, the fitters "feel" the yield and stop there. You cannot feel the yield point on alloy bolts, the transition is smooth. Because they didn't feel the yield, the fitters kept on torquing till the bolts broke.

Edit. Ooops, I should have made this OT.

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