Measurement of the shear modulus of wood by asymmetric four-point bending tests |
| |
Authors: | Hiroshi Yoshihara and Yoshitaka Kubojima |
| |
Institution: | (1) Faculty of Science and Engineering, Shimane University, Nishikawazu-cho, 1060, Matsue, 690-8504 Shimane, Japan;(2) Forestry and Forest Products Research Institute, 305-8687 Tsukuba, Japan |
| |
Abstract: | We conducted asymmetric four-point bending tests of wood and obtained the shear moduli on the basis of Timoshenko's theory of bending. Akamatsu (Japanese red pine,Pinus densiflora D. Don) and shioji (Japanese ash,Fraxinus spaethiana Lingelsh.) were used for the tests. Asymmetric four-point bending tests were undertaken by varying the depth/span ratios; and Young's modulus and the shear modulus were calculated by Timoshenko's bending theory. Independent of the asymmetric bending tests, we also conducted three-point bending tests, free-freeflexural vibration tests, and numerical calculations by the finite element method. Young's and shear moduli obtained by these methods were compared with those derived from the asymmetric bending tests. Based on these comparisons, we concluded that the shear modulus can be properly obtained by the asymmetric four-point bending tests when the span is 20 times larger than the depth. |
| |
Keywords: | Shear modulus Asymmetric four-point bending test Timoshenko's beam theory Depth/span ratio |
本文献已被 SpringerLink 等数据库收录! |
|