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集成材指接节点抗弯性能试验研究与数值模拟 被引量:2
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作者 王明谦 《建筑结构》 CSCD 北大核心 2020年第5期38-43,共6页
为研究结构用集成材指接节点在弯矩作用下的破坏机理和损伤演化规律,设计并制作了6个指接节点试件,对其进行单调加载试验。采用有限元软件ABAQUS建立指接节点精细化有限元分析模型。通过粘聚区模型跟踪指接节点区域的损伤演化过程。试... 为研究结构用集成材指接节点在弯矩作用下的破坏机理和损伤演化规律,设计并制作了6个指接节点试件,对其进行单调加载试验。采用有限元软件ABAQUS建立指接节点精细化有限元分析模型。通过粘聚区模型跟踪指接节点区域的损伤演化过程。试验结果表明,指接节点的主要破坏模式以胶层受拉和受剪破坏为主,木材顺纹受拉破坏相对有限。有限元模型对指接节点的初始刚度和极限承载力具有良好的预测精度,满足工程精度要求。参数分析结果表明,木材顺纹抗压弹性模量对指接节点的初始刚度具有显著影响;横纹抗压弹性模量对指接节点的初始刚度的影响并不显著。胶层抗拉强度和抗剪强度对指接节点极限承载力均具有显著影响。 展开更多
关键词 结构用集成材 指接节点 纯弯试验 有限元分析
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Analysis of Shock Acceleration by Dotting of Finger Braille and Influence of Postures of Receiver's Hand
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作者 Yasuhiro Matsuda Tsuneshi Isomura 《Computer Technology and Application》 2013年第5期231-240,共10页
Finger Braille is one of the tactual communication media of deafblind people. In one-handed Finger Braille, a sender dots the left part of the Braille code on the Distal Interphalangeal (DIP) joints of the index, mi... Finger Braille is one of the tactual communication media of deafblind people. In one-handed Finger Braille, a sender dots the left part of the Braille code on the Distal Interphalangeal (DIP) joints of the index, middle and ring fingers of a receiver, and subsequently dots the right part of the Braille code on the Proximal Interphalangeal (PIP)joints of the same fingers. Because there is a small number of non-disabled people who are skilled in Finger Braille, deafblind people communicate in this medium only through an interpreter. We have been developing a Finger Braille recognition system using small piezoelectric accelerometers worn by the receiver To recognize the dotted positions (DIP or PIP joints), we have made a hypothesis that the dotting on the DIP joints causes a hard impact, and the dotting on the PIP joints causes a soft impact, when the receiver's hand forms a natural longitudinal arch on the desk. The difference of each impact is indicated by its damping amplitude ratio. In this paper, a measurement experiment about the postures of the receiver's hand was conducted. The postures of the receiver's hand were as follows: forming the natural longitudinal arch on the desk and fully contacting the desk. As a result, the dotting on the DIP joints of both postures caused the hard impacts; the dotting on the PIP joints caused the soft impact when the receiver's hand formed the natural longitudinal arch; the dotting on the PIP joints caused the hard impact when the receiver's hand fully contacted the desk. Therefore, we could verify the hypothesis. 展开更多
关键词 Finger Braille communication aid shock acceleration.
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