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Fracture toughness of wood in mode II

Submitted by parisa on Wed, 03/31/2010 - 02:51

Hi everybody,

I have done some experiments on the fracture toughness in mode II of wood specimens using attached geometry;so using

formula KIIc= 5.11P(3.1415*a)^0.5 /(2BW) I was able to calculate the frcature toughness of wood, but I am quite suprised

why this equation does not iclude depth of the specimens and moreover, I think that I have obtained higher values for the

fracture toughnes values. Is there any other formulation for obtaining the fracture toughness in mode II for this specimen?

P.s. dimension of my specimens is 100*100*63mm

Analysis of beams with hole

Submitted by parisa on Fri, 03/05/2010 - 22:34

research

Change in stress intensity factors

Hi everybody,

Is there any limits for using of LEFM? I have modelled a beam with a penetration.I have moved the holes vertically in the beam and obtained the stress intensities for each movements at the corners of the hole. Now the hole is closing the edge, stress intensities in mode I and II, suddenly change values (positive to negative and vice versa) what does this mean ?... Does it mean that I should limit my movements?,,,,

Thank you,

Parisa,

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