通过对美国钢结构设计规范Specification for Structural Steel Buildings-Allowable Stress Design and Plastic Design(AISC-ASD89)的解读,归纳总结了运用美标AISC-ASD89进行钢结构构件梁、柱强度的计算方法,并对美标中的英制计算公...通过对美国钢结构设计规范Specification for Structural Steel Buildings-Allowable Stress Design and Plastic Design(AISC-ASD89)的解读,归纳总结了运用美标AISC-ASD89进行钢结构构件梁、柱强度的计算方法,并对美标中的英制计算公式进行了公制转换.展开更多
Surface of Ultra-high molecular weight polyethylene （UHMWPE） fiber were treated by chromic acid chemical etching, pyrrole chemical vapour phase deposition and the complex of these two methods, respectively. The chan...Surface of Ultra-high molecular weight polyethylene （UHMWPE） fiber were treated by chromic acid chemical etching, pyrrole chemical vapour phase deposition and the complex of these two methods, respectively. The change of surface properties and structure of fibers were discussed by Fiour Transform Infrared Spectroscope （FTIR）, Dynamic Mechanical Analysis （DMA） and Scanning Electron Microscope （SEM）. The results show that some new oxygenous groups could be found on surface of UHMWPE fiber after chromic acid chemical etching, which enhanced intemolecular interaction with polypyrrcle. The adhesion of the fiber and resin natrix increased after pyrrole chemical vapour deposition. When chromic acid etching combined with pyrrole chemical vapor deposition, the treated fiber not only has the same properties as original fiber bat also outstanding adhesion to epoxy resin matrix, and its composites have better mechanic properties shear strength）, resulting from intemolecular interaction treated fiber and polypyrrole.展开更多
文摘通过对美国钢结构设计规范Specification for Structural Steel Buildings-Allowable Stress Design and Plastic Design(AISC-ASD89)的解读,归纳总结了运用美标AISC-ASD89进行钢结构构件梁、柱强度的计算方法,并对美标中的英制计算公式进行了公制转换.
文摘Surface of Ultra-high molecular weight polyethylene （UHMWPE） fiber were treated by chromic acid chemical etching, pyrrole chemical vapour phase deposition and the complex of these two methods, respectively. The change of surface properties and structure of fibers were discussed by Fiour Transform Infrared Spectroscope （FTIR）, Dynamic Mechanical Analysis （DMA） and Scanning Electron Microscope （SEM）. The results show that some new oxygenous groups could be found on surface of UHMWPE fiber after chromic acid chemical etching, which enhanced intemolecular interaction with polypyrrcle. The adhesion of the fiber and resin natrix increased after pyrrole chemical vapour deposition. When chromic acid etching combined with pyrrole chemical vapor deposition, the treated fiber not only has the same properties as original fiber bat also outstanding adhesion to epoxy resin matrix, and its composites have better mechanic properties shear strength）, resulting from intemolecular interaction treated fiber and polypyrrole.
