Abstract
Terahertz wave has been used to obtain the internal information of materials due to its penetrability to optically opaque materials. In this paper, we propose a full-field stress measuring method using terahertz time-domain spectroscopy. The theoretical model of the method was established based on the stress-optical law, and the method was then validated experimentally. A four-point bending experiment was conducted to determine the stress-optical coefficient of the specimen material, after which the proposed method was used to measure the stress distribution of a diametrically loaded disk. The experimental results present a reasonable agreement with the theoretical solution.
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