Fracture toughness, fracture energy and slow crack growth of glass as investigated by the Single-Edge Precracked Beam (SEPB) and Chevron-Notched Beam (CNB) methods

T. To (1) , F. Celarie (1) , C. Roux-Langlois (1) , A. Bazin (1) , Yann Gueguen (1) , H. Orain (1) , M. Le Fur (1) , V. Burgaud (1) , Tanguy Rouxel (1)

1 IPR - Institut de Physique de Rennes

We show that the Single-Edge Precracked Beam (SEPB) test is not only suitable to the determination of the fracture toughness (KIc) of glass, but also offers a unique opportunity to assess the slow crack growth behavior in a single experiment lasting for few minutes. Besides, we found that it is possible to get either a stable or an unstable final fracture regime (pre-cracked specimen) depending on the testing parameters, and that the unstable case is preferable for the estimation of KIc. The “pop-in” precrack was found mostly to close completely once the load was suppressed on the bridge-flexure device. This led to a reopening event on the loading curves. It is noteworthy that all these original observations were made possible thanks to the design of a very stiff testing apparatus (6.7 MN m−1) allowing for a cross-head speed as small as 0.01 μm s−1. Results obtained on four grades of commercially available glasses are compared to those stemming from Vickers indentation cracking and chevron notched experiments. © 2017 Acta Materialia Inc.

Mots clés: Stress-corrosion; Vickers Indentation Fracture (VIF); Single-Edge Precracked Beam (SEPB); Chevron-Notched Beam (CNB); Fracture toughness

Domaines: Physique [physics]

T. To, F. Celarie, C. Roux-Langlois, A. Bazin, Yann Gueguen, et al.. Fracture toughness, fracture energy and slow crack growth of glass as investigated by the Single-Edge Precracked Beam (SEPB) and Chevron-Notched Beam (CNB) methods. Acta Materialia, 2018, 146, pp.1-11. ⟨10.1016/j.actamat.2017.11.056⟩. ⟨hal-01695489⟩