סמינר מחלקה של ישראל סולומון - קידום סדק יציב בזכוכית סודה ליים

School of Mechanical Engineering Seminar
Wednesday, October 26, 2022 at 14:00
Wolfson Building of Mechanical Engineering, Room 206

Stable crack propagation in Soda lime glass

Israel Solomon

M.Sc. student of prof. Dov Sherman

This research presents the development of a new method to cleave brittle amorphous materials. The loading in the new method is displacement controlled, resulted, presumably, with stable crack propagation under pure Mode I. The main goal of this method is to study the difference between stable crack propagation in materials possessing long-range order atomistic arrangement (typical for brittle crystals), and that in short-range order (typical for amorphous glasses) along the crack front.  The second goal was to evaluate the cleavage energy at initiation for stable cracks propagation.

Surprisingly, the cracks were propagated unstably, macroscopically, at very low speed. No initiation, propagation, and arrest cycles were observed, owing to the amorphous arrangement at the crack front. Evaluations of the energy release rate (ERR) by the J-integral of static and frictional contact boundary value problem (BVP) finite element analysis (FEA) of amorphous soda-lime glass, were performed. The new macroscopic experimental parameter representing the strain energy release rate gradient, Q, was incorporated and was used to show the lower and upper limits for the initial preload. In addition, this new parameter was used to determine whether the crack preloading conditions are leading to correct fracture related properties.

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