Experimental Studies on the Brittle Fracture Stress

All real materials contain defects which significantly reduce the fracture stress of brittle materials. It has been proposed by Griffith [3] that brittle fracture occurs when the maximum intensified tensile stress on the surface of a defect reaches a critical value. It has recently been found [1] that for many brittle materials of high quality, the nature and density of the defects are such that they may be modelled by isolated cylindrical voids. This study considers the stress intensification consequences of the close spacing of cylindrical defects that are filled with a material having a Young’s modulus different than that of the matrix.

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Brittle Fracture Stress of Ultrafine-Grained Low-Carbon Steel

MATERIALS TRANSACTIONS ◽

10.2320/matertrans.m2017135 ◽

2017 ◽

Vol 58 (10) ◽

pp. 1505-1508 ◽

Cited By ~ 5

Author(s):

Tadanobu Inoue

Keyword(s):

Carbon Steel ◽

Brittle Fracture ◽

Fracture Stress ◽

Low Carbon Steel ◽

Low Carbon ◽

Ultrafine Grained

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INTERMEDIATE FRACTURE STRESS AND FRACTURE INITIATION MODE TRANSITIONS IN THE BRITTLE FRACTURE OF STRUCTURAL STEELS

The Physical Metallurgy of Fracture ◽

10.1016/b978-0-08-022138-0.50035-6 ◽

1978 ◽

pp. 165-171

Author(s):

A. Kochendoerfer

Keyword(s):

Brittle Fracture ◽

Fracture Stress ◽

Fracture Initiation ◽

Structural Steels ◽

Mode Transitions

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Brittle Fracture of Ice at 77 K

Journal of Glaciology ◽

10.3189/s002214300020066x ◽

1975 ◽

Vol 14 (71) ◽

pp. 305-315 ◽

Cited By ~ 35

Author(s):

V. R. Parameswaran ◽

Stephen J. Jones

Keyword(s):

Brittle Fracture ◽

Single Crystals ◽

Uniaxial Compression ◽

Fracture Stress ◽

Room Temperature ◽

Theoretical Strength ◽

Strain Rates ◽

Stress Strain

AbstractLaboratory-grown single crystals, both pure and HF-doped, and pure polycrystals of ice, as well as natural, columnar-grained ice from the River St Lawrence, have been deformed in uniaxial compression at 77 K at strain-rates between 10-5 and 10-3 s-1. Brittle fracture was observed, with stress-strain curves similar to those found for rocks at room temperature. The first cracks appeared at low stresses, ≈0.3 MN m-2, in agreement with theory, but the failure or fracture stress was high ≈50 MN m-2. The ratio of experimental to theoretical strength was o.28. HF doping of the single crystals had no effect at this temperature.

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