Method and device for evaluating porosities inside composite material
AssigneesKawasaki Jukogyo Kabushiki Kaisha, Kyoto University
InventorsShiro Biwa, Akira Kuraishi
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Abstract
In a method of evaluating porosities, firstly, an ultrasonic wave is input in a thickness direction of a composite material to an incident surface which is one of the surfaces of the composite material having a multi-layer structure, and a reflective wave (whole reflective wave) is received from the incident surface. Then, the time-frequency analysis for the received whole reflective wave is performed. Thus, the temporal change information of the reflective wave (interlayer reflective wave) included in the whole reflective wave and reflected on an interlayer interface of the multi-layer structure, is obtained. This change information is suitably used to evaluate a distribution of porosities in the thickness direction of the composite material.
Claims10
A method of evaluating porosities contained in a composite material, the method comprising:
- inputting an ultrasonic wave in a thickness direction of the composite material to an incident surface which is one of surfaces of the composite material and receiving a reflective wave from the incident surface, the composite material having a multi-layer structure which is obtained by laminating a plurality of plies of prepreg and curing the prepreg;
- and
- performing time-frequency analysis of a whole reflective wave to obtain damping that is temporal change information of an interlayer reflective wave, the temporal change information being used to evaluate a distribution of the porosities contained in the composite material, in the thickness direction of the composite material, the whole reflective wave being the reflective wave received, and the interlayer reflective wave being a reflective wave included in the whole reflective wave and reflected on an interlayer interface of the multi-layer structure.
A device for evaluating porosities contained in a composite material, the device comprising:
- an ultrasonic wave detection unit which inputs an ultrasonic wave in a thickness direction of the composite material to an incident surface which is one of surfaces of the composite material and receives a reflective wave from the incident surface, the composite material having a multi-layer structure which is obtained by laminating a plurality of plies of prepreg and curing the prepreg;
- and
- a time-frequency analyzing unit which performs time-frequency analysis of a whole reflective wave to obtain damping that is temporal change information of an interlayer reflective wave, the temporal change information being used to evaluate a distribution of the porosities contained in the composite material, in the thickness direction of the composite material, the whole reflective wave being the reflective wave received, and the interlayer reflective wave being a reflective wave included in the whole reflective wave and reflected on an interlayer interface of the multi-layer structure.
Dependencies are inferred from the claim text.