共查询到20条相似文献,搜索用时 62 毫秒
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硬质聚氨酯泡沫塑料力学性能与密度、增强剂含量的关系 总被引:4,自引:1,他引:3
探讨了硬质聚氨酯泡沫塑料的力学性能与密度、增强剂含量的特别是在较宽的密度和增强剂含量范围内对硬质聚氨酯泡沫塑料进行了应用研究,为其作为结构材料提供了依据。 相似文献
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Influence of reinforcing continuous carbon fibers on the viscoelastic properties of the epoxy matrix
The influence of reinforcing continuous carbon fibers (AS4) on the creep and fracture of the epoxy (3501–6) matrix was studied by dynamic mechanical thermal analysis test, creep test and constant strain rate test. While the glass transition temperature (Tg) of the epoxy matrix (512 K) was increased by 5–6°K by the reinforcing fibers, the activation energy for creep/relaxation was the same for both the epoxy and its composites except off-axis composites, for which the activation energy was higher. An increase in the instantaneous and rubbery moduli and a reduction in tanδmax indicate that the reinforcing fibers stiffen the matrix and reduce the extent of viscous deformation in the epoxy matrix. This is corroborated by the creep results that recorded a reduction in the creep rate and the magnitude of creep of the pure epoxy due to the reinforcing fibers. A consequence of this reduction in energy dissipation by viscous deformation, in the epoxy matrix due to the reinforcing fibers, is a decrease in the toughness (i.e. the total fracture energy) of the epoxy matrix measured by constant strain rate test. 相似文献
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研究通过试验探讨了钢纤维掺量、配筋率、约束筋表面形式、约束筋材料等因素对高强钢纤维混凝土收缩性能的影响.研究结果表明,提高混凝土中钢纤维的掺量能够降低高强钢纤维混凝土的自由收缩量.当约束筋材料相同时,高强钢纤维混凝土的收缩随着配筋率的提高而降低.钢筋的表面形式对高强钢纤维混凝土的收缩没有显著影响.在相同配筋率下,约束筋材料的弹性模量越低,对高强钢纤维混凝土收缩的抑制作用越弱. 相似文献
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寻找到适用于全碳粉生坯的减水剂和增强剂,并从热力学、胶体化学等方面对减水剂和增强剂在全碳粉生坯中的作用机理进行了初步探讨。 相似文献
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Ion exchange membranes prepared by the paste method contain polyvinylchloide cloth as a reinforcing material, which is necessarily used to endow the membranes well-balanced properties: electrochemical and mechanical properties. The role of the reinforcing material was studied in terms of the membrane structure. 相似文献
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The scanning micro-reference electrode (SMRE) technique was used to study the corrosion behavior of reinforcing steel in simulated concrete pore (SCP) solutions with different pH values. The early stage as well as the propagation of the localized corrosion of reinforcing steel in different solutions was explored. The results indicated that the potential distribution on the reinforcing steel surface changed in homeostasis and the steel remained passive in the pure simulated concrete pore solution. The solution pH had a significant effect on the localized corrosion of reinforcing steel, and the critical pH value for localized corrosion of reinforcing steel in SCP solutions was between 11.46 and 11.31. 相似文献