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冲击载荷作用下混凝土本构模型(英文) 总被引:2,自引:0,他引:2
为了更好地设计和分析混凝土结构,对冲击荷载作用下混凝土材料的力学特性进行了研究.将混凝土材料看成实体和微裂纹组成的复合材料,其中实体由粗骨料和水泥砂浆基体组成.假设水泥砂浆基体为弹性的、均匀的和各向同性的.基于Mori-Tanaka理论和Eshelby等效夹杂理论建立了冲击荷载作用下混凝土材料的动态本构模型.同时,进行了混凝土和水泥砂浆的冲击压缩试验.实验表明:混凝土和水泥砂浆都是率相关材料.在相同的冲击速度下,混凝土比水泥砂浆具有更高的承载能力,但混凝土的最大应变低于水泥砂浆材料.不论混凝土材料还是水泥砂浆材料,随着冲击速度的提高,破坏实验后试件的尺寸都逐渐减小. 相似文献
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一个国家的汇率一向与其经济贸易密不可分。人民币升值给中国外向型企业带来了机遇的同时也伴随着挑战。人民币呈升值趋势有一系列原因,通过分析其对中国外向型企业的冲击和影响,一些应对的措施和办法可以为企业寻求可持续的稳定发展路径提供参考。 相似文献
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采用系统分析的方法,借助体育管理学的相关原理,以SWOT分析方法为媒介对高校体育产业的内部因素,包括优势因素、弱势因素、机遇因素和威胁因素进行系统分析;分析中发现高校体育产业发展体制的混乱是制约其发展的关键因素,继而建立了适合我国实际情况的高校体育产业发展体制模式.期望在体育产业蓬勃发展的大好背景下,为高校体育产业的发展提供参考依据. 相似文献
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Mom was a good cook.No,I take that back.She was a great cook.She could take a little hamburger,a few potatoes and some canned tomatoes and whip up(激起) a great party worthy of the International Olympic Committee.And the things she could do with a chicken...well,it makes my mouth water to think about it.Her homemade chili sauce was second to none.Her bottled peaches were better than candy.And I once offered to make my sister Kathy's bed for a week if she would give me the last slice of toast made with Mom's homemade bread and slathered in Mom's homemade apricot jam. 相似文献
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Heather Wakefield 《海外英语》2006,(6)
仆e和。旅p‘behind me忱“d to di‘.ppe.r,.‘my】阅m即.d代咖川。n, bei叮加缺n。代r by the 11川e喃i忱n.比. The饥巴b巴ide me‘物y in thei画‘ible骊nd, gendy伽(hed倾功.bl己n械叮,now. 讨hyi‘i扮 仆。t骊山伙斗】皿m即讹加ke, the,搜p‘behindu,脚比pl己〔ed. 相似文献
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《海外英语》2006,(Z1)
Allow Your Own Inner Light to Guide You There comes a time when you must stand alone. You must feel confident enough within yourself to follow your own dreams. You must be willing to make sacrifices. You must be capable of changing and rearranging your priorities so that your final goal can be achieved. 相似文献
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《语数外学习(初中版)》2007,(9)
"Dreams may be more important than sleep. We all need to dream." some scientists say. Dreams take up about one quarter of our sleeping time. People have several dreams each night. Dreams are like short films. They are usually in color. 相似文献