杨木/刺槐复合结构的胶层剪切强度及宏观压痕试验
首发时间:2013-01-31
摘要:以杨木、刺槐及水性高分子-异氰酸酯胶黏剂(EPI)制成胶合件,对其进行了胶层剪切强度及胶层部位的宏观仪器化压痕试验,结果表明:刺槐间的胶层剪切强度大于杨木间,胶合压力的大小对杨木/刺槐间的胶层剪切强度影响差异不显著;较小规定试验力对胶层部位压痕蠕变差异不显著,胶合压力大的杨木/刺槐间胶层部位压痕蠕变小;杨木及杨木间胶层部位的压痕功大于刺槐及含有刺槐胶层部位,压痕功中的塑性变形压痕功显著大于弹性变形压痕功,依据试验力-压痕深度曲线计算得到的刺槐及含有刺槐胶层部位的名义硬度较大。
关键词: 杨木 刺槐 复合结构 胶层剪切强度 压痕蠕变 压痕功 名义硬度
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Shear Strength on Adhesive Layer and Macro-instrumental Indentation Experiment of Poplar/Black Locust Composite Structure
Abstract:In this paper, the shear strength on adhesive layer and macro-instrumental indentation experiment on bonding parts of gluing specimen that made from poplar, black locust and emulsion polymer-isocyanate adhesive(EPI) were carried out. The results showed that, shear strength on adhesive layer between black locust blocks is higher than that between poplar blocks , bonding pressure has no obvious effect on its shear strength; for smaller test force, the difference of indentation creep is not significant, the indentation creep on bonding parts with higher bonding pressure between poplar and black locust is slight; Indentation work on poplar and bonding parts between poplar blocks is more than black locust and bonding parts containing black locust, plastic deformation work of indentation work is greater than elastic deformation work significantly, the nominal hardness of black locust and bonding parts containing black locust is higher than others based on force-indentation depth curve.
Keywords: Poplar Black locust Composite structure Shear strength on adhesive layer Indentation creep Indentation work nominal hardness
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