Premium
Double‐Cantilever‐Beam Testing of a Transversely Isotropic Fibrous Silica Material
Author(s) -
GREEN DAVID J.,
HAWKINS CHRISTOPHER A.,
HIRLINGER MARGARET M.
Publication year - 1983
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1983.tb09966.x
Subject(s) - materials science , transverse isotropy , cantilever , beam (structure) , composite material , isotropy , timoshenko beam theory , fracture mechanics , ultimate tensile strength , material properties , fracture (geology) , geometry , structural engineering , optics , mathematics , physics , engineering
The double‐cantilever‐beam (DCB) geometry was used to study the fracture behavior of a transversely isotropic fibrous silica material that is used in the thermal protection system of the Space Shuttle. For this testing geometry, the evaluation of K c requires measurement of the elastic constants of the material. Determination of the compliance behavior of the material allowed the various analytical beam models that have been put forward to describe the DCB geometry, to be distinguished. The Timoshenko beam on a generalized foundation was found to be the best model to describe the experimental compliance behavior and the K c measurements. The measured K c values were found to be higher than for previous work that had used the double edge‐notched tensile geometry. Crack propagation in the material was found to be characterized by variations in the crack‐resistance force, probably reflecting microstructural variations. The subcritical crack‐growth behavior was studied using the constant‐load‐mode DCB technique, and the results were in agreement with the predictions of an earlier study.