Re: Fracture energy

[EMAIL PROTECTED] (formerly) wrote:
> "Danny" <[EMAIL PROTECTED]> wrote
> cross posting to sci.engr.mech 
and sci.engr.analaysis

> > Hi
> > If i snap a wire of diameter 1 mm and length of 1 m with a force of 600N.
> >
> > How do i calculate the fracture energy, or am i barking up the wrong
> > tree with a misunderstanding of the term fracture energy?
> >
> > Dan 
>
> My first guess would be to integrate force over displacement as you stretch
> the wire.  This would give you strain energy.  As to fracture energy,
> perhaps some of the folks in these two groups can offer suggestions..
>
> David A. Smith

If the the wire is totally free of flaws, the energy required to
break would the total strain energy.  In this case the wire has
a uniform stress through the cross section and along its length.
So the strain energy is area under the stress-strain curve times
the volume.

Fracture as in fracture mechanics is really not applicable for
static loading as in this wire problem.