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混杂纤维增强木梁的受弯性能试验研究
选用碳纤维(CF)、玻璃纤维(GF)和高强玻璃纤维(SGF)为增强材料,制作CF,CF/GF和CF/SGF层间组合混杂纤维增强木梁,并对其受弯性能进行了试验研究,同时分析了该木梁的破坏形态和破坏机理,讨论了其荷载-位移特征、极限承载力和延性.结果表明:与单一CF增强相比,合理匹配混杂纤维增强复合材料(HFRP)可显著提高木梁的承载力和延性.提出了HFRP增强木梁的极限承载力计算方法.杨友龙,熊光晶 - 建筑材料学报文章来源： 万方数据 -
Common compliant joints generally have limited range of motion,reduced fatigue life and high stress concentration.To overcome these shortcomings,periodically corrugated cantilever beam is applied to design compliant joints.Basic corrugated beam unit is modeled by using pseudo-rigid-body method.The trajectory and deformation behavior of periodically corrugated cantilever beam are estimated by the transformation of coordinate and superposition of the deformation of corrugated beam units.Finite element analysis(FEA)is carried out on corrugated cantilever beam to estimate the accuracy of the pseudo-rigid-body model.Results show that the kinetostatic behaviors obtained by this method,which has a relative error less than 6%,has good applicability and corrugated cantilever beam has the characteristics of a large range of motion and high mechanical strength.The corrugated cantilever beam is then applied to design a flexible rotational joint to obtain a larger angle output.The paper proposes a pseudo-rigid-body model for corrugated cantilever beam and designed a flexible rotational joint with large angle output.- 中国机械工程学报文章来源： 万方数据
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沥青混合料抗裂性能评价指标的试验研究
基于沥青路面裂纹扩展行为,设计预切口小梁试件的疲劳试验,以模拟其复合裂纹扩展模式;以疲劳寿命指标来评价沥青混合料的抗裂性能,同时进行沥青混合料的低温弯曲试验和J积分试验,试验混合料采用4种低温性能差异显著的沥青胶结料.判别各项评价指标对试验混合料抗裂性能的鉴别程度,并分析沥青低温临界温度指标、低温弯曲试验指标、J积分试验指标与预切口小梁疲劳寿命的相关性.结果表明:以混合料疲劳性能为基准的混合料抗裂性能排序与沥青胶结料临界温度的排序一致,也与沥青混合料低温弯曲试验和J积分试验中能量指标的排序一致.刘栋,李立寒 - 建筑材料学报文章来源： 万方数据
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