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照片p



Age: 30
Joined: 15 Oct 2012
Posts: 10

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PostPosted: Mon Oct 15, 2012 1:33 am  Post subject:  维空间的连 Reply with quoteBottom of PageBack to top


物体由徽砚尺度上的无穷大《足够大》和宏观尺度上的无穷小(足够小》的物质实体在三
维空间的连续分布所构成.在三维空间占据确定的位t、具有确定的大小和形状。
构成物体的鹅本物质实体《橄砚尺度上的无穷大和宏砚尺度上的无穷小》称为物质点。
物质点是客观存在的物质实体.但在宏观尺度上进行力学分析时,可将物质点视为带有某种物
理性质的几何点.或者说.是肤予了某种物理性质的几何点。物质点所带有的某种物理性质是
作为物质实体的物质点所其有的徽砚尺度物理性质的统计平均位。物体作为物质点在三维空
间的连续分布模m称为连续介质模岌。
2.均匀性、
,?物体作为连续介质摸皿.对于给定的物体,物体上连续分布的物质点枕与物体在三维空间
所占据的几何区城(恰当的大小和形状)中的几何点一一对应,物体内的任愈闭曲面所包含的
子物体同其对应的几何子V城一一对应.如l甘2.1所示公、
物体n
与钧体对应
的1L何试城
用2.1
设物体内的任愈给定子物体n其有质址(一种物理性质》石.定义
(2.1)
-m-D
http://www.baiedu.org/ -P
式中.P称为子物体n的平均单位体积质最'n为与子物体r对应的几何区城中的子区城.
在任愈时刘取一物质点rEn.且当几何子区城n--O(在n一。的过程中必须润足rEn)



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ivy00135
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Joined: 06 Nov 2012
Posts: 49808

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PostPosted: Wed Nov 07, 2012 2:24 am  Post subject:  (No subject) Reply with quoteBottom of PageBack to top

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ninest123




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PostPosted: Mon Jun 18, 2018 6:01 pm  Post subject:  (No subject) Reply with quoteBottom of PageBack to top

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