The pultrusion of the polybenzoxazine resin matrix Z-pin is studied, because the Z-pin technology is an efficient reinforcement method for composites. Based on the curing characteristics acquired by differential scann...The pultrusion of the polybenzoxazine resin matrix Z-pin is studied, because the Z-pin technology is an efficient reinforcement method for composites. Based on the curing characteristics acquired by differential scanning calorimeter（DSC） analysis, the suitable mould temperature for pultrusion is researched with the visual inspection and the Z-pin short beam shear test. The pull-out test is designed to evaluate the post oven temperature that can affect the combination between Z-pins and laminates. And then, the appropriate temperature for the post oven is obtained. Finally, micro photos are used to inspect the defects in Z-pins. The results show that when the resin is heated to 70°C, Z-pin pultrusion demands for viscosity are satisfied, and the shelf-life is about 4 h. With the mould temperature increasing to 140°C, the Z-pin short beam shear strength rises correspondingly and the cross section profile is the best. When the post oven temperature declines, the combination between Z-pins and laminates becomes stronger. However, pores appear in Z-pins unless the oven temperature increases to 200°C. Therefore, the optimum post oven temperature should be set at 200°C.展开更多
简述了国内首条大幅面CLT生产线制造的铁杉正交胶合木(CLT)的工艺过程,并主要对该CLT板主强度方向的弹性模量、抗弯强度,以及胶层剪切强度、层间剪切强度和浸渍剥离等性能进行了测试与分析。表明:铁杉CLT的抗弯性能和抗剪性能测试值均...简述了国内首条大幅面CLT生产线制造的铁杉正交胶合木(CLT)的工艺过程,并主要对该CLT板主强度方向的弹性模量、抗弯强度,以及胶层剪切强度、层间剪切强度和浸渍剥离等性能进行了测试与分析。表明:铁杉CLT的抗弯性能和抗剪性能测试值均能达到加拿大ANSI APA PRG320—2012标准相关等级要求;CLT垂直层滚动剪切强度是决定CLT抗弯强度和界面层剪切强度的主要因素;真空—加压浸渍处理对胶结面附近木材力学性能的影响大于对胶层的影响,其浸渍剥离率的平均值为9.75%,单组份PUR胶黏剂的胶层剪切强度和耐候性等性能符合室外环境的使用要求;铁杉CLT的抗弯性能和抗剪性能测试值达到加拿大ANSI APA PRG320—2012标准相关等级要求,满足工程要求。展开更多
基金Supported by the Military Product Itemthe Research Funding of Nanjing University of Aeronautics and Astronautics(NS2010162)~~
文摘The pultrusion of the polybenzoxazine resin matrix Z-pin is studied, because the Z-pin technology is an efficient reinforcement method for composites. Based on the curing characteristics acquired by differential scanning calorimeter（DSC） analysis, the suitable mould temperature for pultrusion is researched with the visual inspection and the Z-pin short beam shear test. The pull-out test is designed to evaluate the post oven temperature that can affect the combination between Z-pins and laminates. And then, the appropriate temperature for the post oven is obtained. Finally, micro photos are used to inspect the defects in Z-pins. The results show that when the resin is heated to 70°C, Z-pin pultrusion demands for viscosity are satisfied, and the shelf-life is about 4 h. With the mould temperature increasing to 140°C, the Z-pin short beam shear strength rises correspondingly and the cross section profile is the best. When the post oven temperature declines, the combination between Z-pins and laminates becomes stronger. However, pores appear in Z-pins unless the oven temperature increases to 200°C. Therefore, the optimum post oven temperature should be set at 200°C.
文摘简述了国内首条大幅面CLT生产线制造的铁杉正交胶合木(CLT)的工艺过程,并主要对该CLT板主强度方向的弹性模量、抗弯强度,以及胶层剪切强度、层间剪切强度和浸渍剥离等性能进行了测试与分析。表明:铁杉CLT的抗弯性能和抗剪性能测试值均能达到加拿大ANSI APA PRG320—2012标准相关等级要求;CLT垂直层滚动剪切强度是决定CLT抗弯强度和界面层剪切强度的主要因素;真空—加压浸渍处理对胶结面附近木材力学性能的影响大于对胶层的影响,其浸渍剥离率的平均值为9.75%,单组份PUR胶黏剂的胶层剪切强度和耐候性等性能符合室外环境的使用要求;铁杉CLT的抗弯性能和抗剪性能测试值达到加拿大ANSI APA PRG320—2012标准相关等级要求,满足工程要求。
