accurate equation for calculation of fracture toughness of acrylic resin
Fracture Toughness of a material can alter markedly depending on whether the elastic - plastic field ahead of the crack approxtimates to plain strain or plane stress conditions, much larger values being obtained under plane stress conditions as in thin sheets. general pmeasuring the fracture toughness parameter is to introduce a crack of suitable size into a specimen of suitable dimension and geometry. the specimen is then loaded at a slow rate and the crack extension measured up to the critical condition . The measurement of Klc will be valid if the plastic zone size is small by a facto 10 to the cross - section of the specimen..
thanks for your comments.
Kindly i want the equation or fomula for calculation KIc of a resin material.
Ibrahim, formulas for stress intensity factor calculation are build taking into account mostly geometry of specimen, not the material, so you can use formulas for metalic specimens, wich you can find in appropriate standards. But the conditions Mustafa mentioned about plastic zone size should be satisfied. In other words the more ductile material is, the more thick specimen is needed to obtain correct value of Kic. So you just need to choose the specimen geometry and size to satisfy mentioned conditions for your material and use formula for this specimen.
Here is the standard: http://web.mit.edu/3.35/www/Lecture_notes/fracture-toughness.pdf
Good luck!
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