Resistance curve for the mode II fracture toughness of wood obtained by the end-notched flexure test under the constant loading point displacement condition |
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Authors: | Hiroshi Yoshihara |
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Institution: | (1) Faculty of Science and Engineering, Shimane University, 1060 Nishikawazu-cho, Matsue, Shimane 690-8504, Japan Tel. +81-852-32-6508; Fax +81-852-32-6123 e-mail: yosihara@riko.shimane-u.ac.jp, JP |
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Abstract: | The measurement method of mode II fracture toughness-crack propagation length relation (i.e., the resistance curve, or R-curve) was examined by end-notched flexure tests on sitka spruce (Picea sitchensis Carr.). The tests were conducted by varying the span/depth ratios under the constant loading point displacement condition.
The fracture toughness was measured from the load-crack shear displacement (CSD) and load-longitudinal strain relations. The
crack length was determined by a combination of load-CSD and load-strain compliances and Williams's end correction theory,
as well as the observation of crack propagation. When the specimen had an appropriate span/depth ratio, the fracture toughness
and crack propagation length were measured from the load-CSD compliance and combined load-CSD and load-strain compliances,
respectively, and the R-curve could be determined properly under the constant loading point displacement condition.
Received: March 15, 2002 / Accepted: July 25, 2002 |
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Keywords: | Mode II fracture toughness Crack length R-curve End-notched flexure test |
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