Determination of mode I and mode II fracture toughness of walnut and cherry in TR and RT crack propagation system by the Arcan test

被引：12
|
作者：
Murata, Koji [1 ]
Bachtiar, Erik Valentine [2 ]
Niemz, Peter [2 ,3 ]
机构：
[1] Kyoto Univ, Grad Sch Agr, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto, Kyoto 6068502, Japan
[2] ETH, Inst Bldg Mat, Zurich, Switzerland
[3] Bern Univ Appl Sci, Inst Mat & Wood Technol, Burgdorf, Switzerland
来源：
HOLZFORSCHUNG | 2017年 / 71卷 / 12期
基金：
瑞士国家科学基金会;
关键词：
Arcan test; cherry; fracture toughness; walnut; 4-POINT BENDING TESTS; PROCESS ZONE; SPRUCE WOOD; ENERGY;
D O I：
10.1515/hf-2017-0063
中图分类号：
S7 [林业];
学科分类号：
0829 ; 0907 ;
摘要：
Two specimen types, each from walnut and cherry wood, were prepared for tangential-radial (TR) and radial-tangential (RT) crack propagation systems at 65% of RH and 20 degrees C before mode I and mode II fracture toughness was determined through Arcan tests. It was found that fracture toughness in mode I is in agreement with literature data. In the mode II test, however, the crack propagated in the direction normal to the shear plane and not parallel to it. The release rate of strain energy in terms of the opening failure in mode II was lower than that in mode I. It can be concluded that it is difficult to determine the fracture toughness of RT or TR propagation in hardwood specimens in mode II.
引用
收藏
页码：985 / 990
页数：6
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