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Title: Notch Fracture Toughness of Glasses: Dependence on Rate, Age, and Geometry

Journal Article · · Physical Review Applied
 [1];  [2];  [1]
  1. Weizmann Institute of Science, Rehovot (Israel)
  2. Harvard Univ., Cambridge, MA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Understanding the fracture toughness (resistance) of glasses is a fundamental problem of prime theoretical and practical importance. Here we theoretically study its dependence on the loading rate, the age (history) of the glass, and the notch radius ρ. Reduced-dimensionality analysis suggests that the notch fracture toughness results from a competition between the initial, age- and history-dependent, plastic relaxation time scale τ$$ ^{pl}_0 $$ and an effective loading time scale τext($$ \dot{K} $$I,ρ), where KI is the tensile stress-intensity-factor rate. The toughness is predicted to scale with ρ independently of ξ≡τext/τ$$ ^{pl}_0 $$ for ξ «1, to scale as T$$ \sqrt{ρ} $$log(ξ) for ξ«1 (related to thermal activation, where T is the temperature), and to feature a nonmonotonic behavior in the crossover region ξ~O(1) (related to plastic yielding dynamics). These predictions are verified using 2D computations, providing a unified picture of the notch fracture toughness of glasses. Here, the theory highlights the importance of time-scale competition and far-from-steady-state elasto-viscoplastic dynamics for understanding the toughness and shows that the latter varies quite significantly with the glass age (history) and applied loading rate. Experimental support for bulk metallic glasses is presented, and possible implications for applications are discussed.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1525167
Alternate ID(s):
OSTI ID: 1290312
Journal Information:
Physical Review Applied, Vol. 6, Issue 2; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (7)

Random critical point separates brittle and ductile yielding transitions in amorphous materials journal June 2018
Pinching a glass reveals key properties of its soft spots journal February 2020
Elastoplastic description of sudden failure in athermal amorphous materials during quasistatic loading journal October 2018
Effect of Pinning on the Yielding Transition of Amorphous Solids journal October 2019
A random critical point separates brittle and ductile yielding transitions in amorphous materials text January 2018
Effect of pinning on the yielding transition of amorphous solids text January 2018
Pinching a glass reveals key properties of its soft spots text January 2019

Figures / Tables (6)