METHOD FOR TESTING FATIGUE CRACK PROPAGATION OF COMPOSITE MATERIAL

PURPOSE: To obtain a method for testing fatigue crack propagation of a composite material in which the length of fatigue crack can be evaluated accurately for a composite material in which the tip end position of crack can not be determined definitely. CONSTITUTION: In the fatigue crack propagation...

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Bibliographische Detailangaben
Hauptverfasser:	HIRATA TAKAAKI, HAMAZAKI YOSHITO
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	PURPOSE: To obtain a method for testing fatigue crack propagation of a composite material in which the length of fatigue crack can be evaluated accurately for a composite material in which the tip end position of crack can not be determined definitely. CONSTITUTION: In the fatigue crack propagation test for a composite material in which the tip end position of crack can not be determined definitely, the relationship between the length (a) of a notch 2 and the strain is determined previously for a simulation test piece 1 made of the same material as a fatigue test piece. The crack length is estimated from the strain obtained from the fatigue test piece thus evaluating the fatigue crack length correctly.