TY - JOUR
T1 - An unsymmetric end-notched flexure test for interfacial fracture toughness determination
AU - Sundararaman, V.
AU - Davidson, B. D.
N1 - Funding Information:
This work was supported by the National Science Foundation under Grant MSS-9210844.
PY - 1998
Y1 - 1998
N2 - An unsymmetric end-notched flexure test is described and its suitability for interfacial fracture toughness testing is evaluated. The test specimen consists of a beam-type geometry that is comprised of two materials, one "top" and one "bottom", with a crack at one end along the bimaterial interface. The specimen is loaded in three-point bending, similar to a conventional end-notched flexure test. A plate theory analysis, modified to include the effects of transverse shear deformation in the near tip region, is used to determine the force and moment resultants in the specimen as well as its deformed shape. Results from this analysis are incorporated into a crack tip element approach to predict energy release rate and mode mixity. These analytical predictions are verified by comparison to finite element results. It is shown that, by varying the relative thicknesses and locations of the two materials, the unsymmetric end-notched flexure test can be used to determine the fracture toughness over a reasonably wide range of mode mixities for most bimaterial interfaces.
AB - An unsymmetric end-notched flexure test is described and its suitability for interfacial fracture toughness testing is evaluated. The test specimen consists of a beam-type geometry that is comprised of two materials, one "top" and one "bottom", with a crack at one end along the bimaterial interface. The specimen is loaded in three-point bending, similar to a conventional end-notched flexure test. A plate theory analysis, modified to include the effects of transverse shear deformation in the near tip region, is used to determine the force and moment resultants in the specimen as well as its deformed shape. Results from this analysis are incorporated into a crack tip element approach to predict energy release rate and mode mixity. These analytical predictions are verified by comparison to finite element results. It is shown that, by varying the relative thicknesses and locations of the two materials, the unsymmetric end-notched flexure test can be used to determine the fracture toughness over a reasonably wide range of mode mixities for most bimaterial interfaces.
KW - Bimaterial interfaces
KW - Crack tip element
KW - Energy release rate
KW - Finite element
KW - Fracture mode mixity
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U2 - 10.1016/S0013-7944(98)00017-4
DO - 10.1016/S0013-7944(98)00017-4
M3 - Article
AN - SCOPUS:0032083675
SN - 0013-7944
VL - 60
SP - 361
EP - 377
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
IS - 3
ER -