曲げ試験による木材のせん断強さ測定について

概要

論文の詳細を見る
Since the chair-type specimen in use as JIS shearing specimen has a sharp right-angled notch, the shearing plane of this specimen undergoes an influence of stress concentration and couple of forces. Consequently, shearing strength of this specimen is very small in comparison with true shearing strength. Accordingly, taking note of the bending test that gives pure horizontal shearing stress, the experiment of the measurement ofshearing strength was carried out by the bending test by means of the reinforced Hinoki specimen with soft steel plates in ordcr to prevent bending fracture.The results obtained are summarized as follows: 1. The test for the measurement of shearing strength of eleven kinds of specimens with various beam height and span length was carried out by the bending test. The specimen with beam height of 29 mm and span-height ratio of 6 was most suitable for the measurement of shearing strength of Hinoki. 2. As a result of measurement of shearing strength of the reinforced specimens with soft steel plate, JIS specimens and RADCLIFFE'S specimens, shearing strength of the reinforced specimen was larger than that of JIS specimen and was smaller than that of RADCLIFFE'S specimen. 3. On the assumption that the state of elasticity went on until the fracture, shearing strength of the reinforced Hinoki specimen was <special>122 ± 14 kg/cm²</special> in L-R specimen.
三重大学農学部の論文