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采用大型三轴仪,对直径30 cm,高60 cm,放置两层土工格栅的加筋土复合体试件进行三轴试验。试验获得了加筋土复合体的应力-应变及其抗剪强度特性,以及含水量对加筋土复合体力学性能的影响规律。 相似文献
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基于商用软件平台,利用共轭传热分析方法,针对汽车用复合材料板弹簧的模压热成型工艺进行了研究。建立了复合材料板弹簧模压热成型共轭传热分析模型,利用该模型以整体加热效率和受热均匀性为评价指标比较分析了加热系统不同进出油口组合方案的优劣,并就串联和并联两种导热油路设计的差异进行了对比。最后,通过在模具内部布置热电偶和在分析模型中设置温度监测点,对采用该分析方法模拟复合材料板弹簧模压热成型工艺的可行性进行了验证。所述计算模型和结果为复合材料板弹簧模压热成型工艺设计提供了数据参考。 相似文献
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AbstractThe evolution in type,size and shape of carbides in as-cast American Iron and Steel Institute(AISI) M2 high-speed steel before and after annealing were investigated.The micromechanism which was responsible for those changes was also analyzed and discussed.At the initial stage of reheating,metastable M2C-type carbide decomposed continuously.M6C-type carbide nucleated at the interface of M2C/γfirstly and grow from surface to center.Then MC-type carbide nucleated at both surface of M6C/M6C and inner of M6C.With the increasing decomposition of the metastable M2C-type carbide,the rod-shaped construction of eutectic carbide began necking,fracturing and spheroidizing gradually.Held enough time or reheated at higher temperature,particle-shaped product aggregated and grew up apparently,while secondary carbide precipitated in cell and grew up less sig- nificantly than the former.Based on the above microstructural observation,the thermodynamic mechanism for decomposition of M2C carbide,for spheroidization of products,and for the growth of particles were analyzed.The rate equations of carbides evolution were derived,too.It shows that the evolving rate is controlled by diffusion coefficients of alloy atoms,morphology of eutectic carbides and heating temperature. 相似文献
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震害表明,提高桥梁抗震性能,仅单纯依靠“结构计算”是不能完全解决的。文章通过对桥梁在地震过程中结构破坏特征,以及细部构造对桥梁抗震性能影响的研究,提出为加强桥梁抗震能力,在桥梁细部构造设计中应注意的问题及应采取的构造措施。 相似文献
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从中国散装谷物运输现状出发,分析散装谷物船舶安全管理的实践做法,提出制定国内散装谷物船舶安全管理程序文件,并配套建立国内航行非散装谷物专用船舶数据库、编制散装谷物船舶装载核算软件、细化对散粮船的现场检查工作等安全管理建议。 相似文献
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