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Understanding the Fracture Behavior of Glasses: Correlation Between Brittleness and Elastic Moduli

Researchers at Rensselaer Polytechnic Institute, led by Liping Huang, discovered a significant link between thermo-mechanical anomalies and the brittleness of glasses. Their studies using in-situ high-temperature Brillouin light scattering revealed how the temperature dependence of elastic moduli directly relates to brittle failure. Pure silica glass exhibited high brittleness under load, while a less brittle variant from Asahi Glass Company showed minimal temperature effects and no cracking, highlighting opportunities for developing tougher glass materials.

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Understanding the Fracture Behavior of Glasses: Correlation Between Brittleness and Elastic Moduli

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  1. Elastic root of the fracture behavior of glassesLiping Huang, Rensselaer Polytechnic Institute, DMR 1105238 Outcome: L. Huang’s team at Rensselaer polytechnic Institute found a strong correlation between the thermo-mechanical anomalies and the brittleness of glasses. Impact: A basic understanding of what controls the brittleness will help develop engineering guidelines for making strong and tough glasses. Explanation: In-situ high temperature Brillouin light scattering experiments were carried out to study the temperature dependence of elastic moduli of glass, and correlated with its brittleness. The top figure shows that pure silica glass has a strong positive temperature derivative of elastic moduli, and cracks badly under 9.8 N load. While the less brittle glass from the Asahi Glass Company in Japan shows very little temperature dependence in elastic moduli, and no cracks at all under the same load.

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