National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Stress analysis of modified compact tension specimens: K-calibration curves
Seitl, Stanislav ; Viszlay, V.
Compact tension (CT) test is in engineering frequently used test for metallic materials to determiner fracture parameters/properties, e.g. fracture energy, fracture toughness, crack propagation rate, J-R curves etc. [20]. The modified compact tension (MCT) specimen for cement based composites has to be prepared due to negligible concentration around the holes for tenons. An accurate determination of fracture parameters requires the use of a valid calibration curves, there for in this contribution the stress analysis near the crack tip and calibration curve for modified compact tension test are introduced. The calibration curve is introduced for diameter 150 mm (the specimen could be easy made from the specimen for compression test) and includes all theoretical imperfections that results from preparation of the MCT specimens.
MODIFIED COMPACT TENSION TEST: EVALUATION OF THE EXPERIMENTS OF CYLINDRICAL SPECIMENS FROM CEMENTITIOUS COMPOSITES
Holušová, T. ; Lozano, M. ; Komárková, T. ; Kocáb, D. ; Seitl, Stanislav
The modified compact tension test (MCT) might be in the future a stable test configuration for the evaluation of fracture-mechanics parameter or also a fatigue behavior of the composites materials such the concrete is. Core drilling can be employed to obtain specimens which are cylindrical in shape with the chosen thickness. This contribution focuses on the evaluation of MCT specimen fracture behavior during static tests and the comparison of two different fixing system of the test machine. The results are represented as L-COD diagrams (i.e. load vs. crack opening displacement measured on the loading axis.

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