The surface temperature of small air-dried specimens of yellow cedar (Chamaecyparis lowsoniana Parl.) was measured during center loading and two-point loading tests by using a thermographic device. The center loaded specimens showed a temperature rise up to av. 6 °C immediately below the loading point after the load reached the proportional limit, and showed a sudden rise in temperature around the broken area in the tensile side. The two-point loaded specimens showed a temperature rise in the same manner as the center loaded ones, but some specimens showed a temperature rise also at the center of two loading points.
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