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Effects of Residual Stress and Loading Geometry on Single‐Edge Precracked‐Beam (SEPB) Fracture‐Toughness Test Results
Author(s) -
Grendahl Scott,
Bert Raymond,
Cho Kyu,
BarOn Isa
Publication year - 2000
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.1151-2916.2000.tb01602.x
Subject(s) - materials science , residual stress , fracture toughness , composite material , enhanced data rates for gsm evolution , indentation , bending , ceramic , beam (structure) , fracture (geology) , structural engineering , telecommunications , engineering , computer science
The single‐edge precracked‐beam (SEPB) specimen test, using the “bridge indentation” method, is one of the standard test methods in the new ASTM standard for the determination of the fracture toughness of ceramics. In support of this effort, the effect of several test parameters on the fracture‐toughness ( K I C ) values was established. The effect of the residual stress, because of the indent and the alignment in three‐ and four‐point bending, on the K I C values was determined using aluminum nitride specimens. The results show that indent loads should be kept below 10 kgf, and the crack‐plane angle should be <5°, to prevent artificially high K I C values.