iMechanica - fracture energy - Comments

Hi Mai Lan, It is very

vinh phu nguyen — Sat, 05 Jan 2008 19:19:00 -0500

Hi Mai Lan,

It is very nice to know one more Vietnamese from the mechanics field.

You have posted your question quite long ago so I assume that it has been solved.

Concerning your question, in my opinion, just plot the load displacement curve of the loading node. Then the area of this curve = the fracture energy since the work of external load must be equal to the dissipated energy. I think the vertical displacement of the loading node is appropriate for this. But I am not sure.

BTW, I guess that you are working in France now? Could you email to me at V.P.Nguyen@tudelft.nl for more discussing on mechanics and the like?

Displacement or Deflection for Gf determination in a 4 points?

Mai Lan NGUYEN — Mon, 08 Oct 2007 07:03:35 -0400

Hi Hamanh, thank you very much for your help. I've read this document. However, there is no work on four point bending beam (only three points bending). In fact, in a three points bending fracture test, these two types of displacement (displacement mesured at the upper support and deflection of the beam) is the same. Whereas, in a four point bending fracture test, these two displacements are different. So anyone can help me to show which displacement that's needed to determination of fracture energy in a four points bending fracture test?

Best regards

try this

hamanh — Sat, 06 Oct 2007 07:53:36 -0400

Hi Mai Lan,

Try to look at these link if you can find any interesting points inside.

http://www.lrrb.org/PDF/200615.pdf

or: http://www.lrrb.org/pdf/200423.pdf

Hope it help

Hamanh

I found that there is a

Mai Lan NGUYEN — Fri, 05 Oct 2007 05:31:24 -0400

I found that there is a document : RILEM TC-50 FMC, "Dtermination of the fracture energy of mortar and concrete by means of three-point bend tests on notched beams", Mat. Struct. 18 (1985) 285-290.

Anyone can show me this document, please?