Simplified Data Reduction Methods for the ECT Test for Mode III Interlaminar Fracture Toughness

1996 ◽  
Vol 18 (2) ◽  
pp. 96 ◽  
Author(s):  
WS Johnson ◽  
JE Masters ◽  
DW Wilson ◽  
J Li ◽  
TK O’Brien
Keyword(s):  
Fracture Toughness ◽  
Data Reduction ◽  
Interlaminar Fracture Toughness ◽  
Mode Iii ◽  
Interlaminar Fracture ◽  
Reduction Methods

Interlaminar Fracture Toughness of a Graphite/Epoxy Multidirectional Composite1

2000 ◽  
Vol 122 (4) ◽  
pp. 428-433 ◽  
Author(s):  
Z. Yang ◽  
C. T. Sun
Keyword(s):  
Fracture Toughness ◽  
Data Reduction ◽  
Crack Extension ◽  
Plate Theory ◽  
Interlaminar Fracture Toughness ◽  
Element Analysis ◽  
Unstable Crack ◽  
Interlaminar Fracture ◽  
Reduction Methods ◽  
Data Reduction Method

In this paper, an experimental investigation on interlaminar fracture behavior and fracture toughness of a graphite/epoxy multidirectional composite laminate is presented using end-notched flexure specimens. The 0/θ interfaces are considered. The interlaminar fracture toughness is obtained and compared using three data reduction methods, i.e., the area method, classical laminated plate theory, and finite element analysis. Results show that the toughness value depends on the data reduction method used. Two different crack-length-to-span ratios are chosen to study how the stable or unstable crack extension influences the toughness measurement. It is observed that the toughness obtained from the tests of stable crack extension is appreciably higher than that from the tests of unstable crack extension. It is also seen that friction resulting from contact of crack surfaces greatly affects the measured toughness in the case of stable crack extension. In addition, effects of the specimen geometry and fiber orientation on the interlaminar fracture toughness are also evaluated. [S0094-4289(00)02804-8]

The Split Cantilever Beam Test for Characterizing Mode III Interlaminar Fracture Toughness

1991 ◽  
Vol 13 (1) ◽  
pp. 41 ◽  
Author(s):  
WS Johnson ◽  
PA Lagace ◽  
JE Masters ◽  
SL Donaldson ◽  
S Mall ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Cantilever Beam ◽  
Interlaminar Fracture Toughness ◽  
Beam Test ◽  
Mode Iii ◽  
Interlaminar Fracture
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