What is it about?
In 1912, Nobel laureate Percy W. Bridgman observed a "pinching off" of specimens on the unloaded plane during his compression tests. This and other fractures on unloaded material plane became known as Bridgman's paradox. Bridgman already wondered if it would be helpful to think in terms of deformation rather than loading. Our answer is YES. And we can show how thinking in terms of deformation can explain similar paradoxical observations of brittle failure. Moreover, a new strain criterion predicts brittle fracture at the same limits as the established Mohr-Coulomb criterion. Thus the new criterion is also quantitatively more realistic than previous strain criteria.
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Why is it important?
Deformation can be observed and measured. The work connects observation to causes of cracking and fracture. It explains fracture sites and unexpected extension fractures.
Perspectives
The strength of bones varies over orders of magnitude, from strong cortical bone to weak spongy bone. Therefore, the local density of bone need to be known for stress assessment. On the contrary, the critical strains are nearly the same for all bone qualities. Therefore, a strain based strength criterion is easily applied without knowledge of the local bone density.
Dr.-Ing. Manfred Staat
FH Aachen - University of Applied Sciences
Read the Original
This page is a summary of: An Extension Strain Type Mohr–Coulomb Criterion, Rock Mechanics and Rock Engineering, August 2021, Springer Science + Business Media,
DOI: 10.1007/s00603-021-02608-7.
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