A STUDY WITH FRACTURE MECHANICS ON EVALUATION OF STRENGTH AND FRACTURE CHRACTERISTICS FOR BOLTED JOINTS WITH JAPANESE LARCH GLULAM TENSILE-LOADED PERPENDICULAR TO THE GRAIN
A STUDY WITH FRACTURE MECHANICS ON EVALUATION OF STRENGTH AND FRACTURE CHRACTERISTICS FOR BOLTED JOINTS WITH JAPANESE LARCH GLULAM TENSILE-LOADED PERPENDICULAR TO THE GRAIN
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垂直纹理拉伸日本落叶松胶合板螺栓接头强度及断裂特性评价的断裂力学研究
DOI：
10.3130/aijs.74.1649
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Yuta Ikura
中科院分区：
文献类型：
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作者：
T. Nakagomi;W. Kambe;Yuta Ikura
近年来，一些研究人员一直在研究垂直于纹理加载的接头强度。有些连接以脆性或延性方式失效，其断裂特征取决于接头的尺寸和螺栓直径。但评价木材的断裂是非常困难的，因此提出了一些评价方法。在过去的研究中，我们通过有限元分析对螺栓接头的强度进行了分析，我们了解到解理断裂应力可用于评估脆性断裂的强度，并且J积分可以评估裂纹的萌生。因此，在本研究中，我们将 FEM 分析的 CT 测试获得的 J 积分应用于垂直于晶粒加载、以延性方式断裂的螺栓接头，并且以脆性方式断裂的接头的解理断裂应力与以前相同。作为结果，我们可以计算通过两种断裂模式垂直加载的接头的强度。
Some researchers have been studying the strength of joints loaded perpendicular to grain in latest years. Some connections fails in brittle or ductile manner and its fracture features depend on the size of joints and bolt diameter. But evaluation the fracture of wood is very difficult, so some evaluation method was proposed. In the past study, we analyzed the strength of bolted joints with FEM analysis, and we understood that the cleavage fracture stress is useful to evaluate the strength fractured in brittle and that J-integral has a possibility to evaluate the crack initiation. So in this study, we applied J-integral obtained from CT-tests of FEM analysis to bolted joints loaded perpendicular to grain fractured in ductile manner, and the cleavage fracture stress to the joint fractured in brittle manner as same as before. As the results, we can calculate the strength of joints loaded perpendicular to grain by two fracture patterns.