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Description: 通过三维有限元计算来研究含圆孔有限厚度板的圆孔边缘应力场,找出了应力集中系数与板的厚度、
圆孔半径之间的关系,同时还分析了圆孔边缘的三维应力约束程度和三维应力约束区域的大小. 研究结果表
明:离面应力约束系数在板的中面最大,而在表面为0 ,三维应力约束影响区域的长度约为板厚的一半 应力
集中系数沿厚度的分布是不均匀的,其最大值及位置与厚度有关 有限厚度板中面的应力集中系数及其最大
值均大于平面应力或平面应变的应力集中系数 对含圆孔任意厚度板的应力集中问题,按平面应力或平面应
变来考虑是不安全的 Sternberg 等人对含圆孔任意厚度板的应力分布及应力集中系数的近似三维求解,仅适
用于厚度较小的板,当板超过一定厚度时同样也是不安全的.
关键词: 应力集中系数 有限元分析 有限厚度板-through 3D FEM to study with limited thickness of plate hole hole edge of the stress field, identify the stress concentration factor with the plate thickness, the radius hole of the relationship between also analyzed the edge of the hole three-dimensional and three-dimensional stress extent constrained the size of the area. The results showed : Stress from the restrictive factor in the board faced the greatest, and the surface of 0, the three-dimensional effect of the length of the regional thickness of about half of the stress concentration factor along the thickness of the distribution is uneven, and the location of its maximum thickness and the limited thickness of the slab surface stress concentration factor and the maximum value is greater than or plane stress level plane strain, the
Platform: |
Size: 59710 |
Author: 张开 |
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Description: Edge element based 2D FEM code to calculate Electromagnetic Simulations
Platform: |
Size: 1086 |
Author: danielwood |
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Description: IDE@L is a toolbox for Matlab dealing with Tree rings detection by image processing. This is a Graphical User Interface (GUI) which can help wood scientists in extracting tree rings coordinates. Version 1.0 runs under Matlab 65 (R13) and needs image processing toolbox for 揅anny?edge detection. The outputs are detected rings coordinates (.xls) which can be used by FEM software.
Unzip in a matlab path
launch using command:
ideal_gui
Enjoy !
Platform: |
Size: 1969831 |
Author: 夜妖 |
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Description: 通过三维有限元计算来研究含圆孔有限厚度板的圆孔边缘应力场,找出了应力集中系数与板的厚度、
圆孔半径之间的关系,同时还分析了圆孔边缘的三维应力约束程度和三维应力约束区域的大小. 研究结果表
明:离面应力约束系数在板的中面最大,而在表面为0 ,三维应力约束影响区域的长度约为板厚的一半 应力
集中系数沿厚度的分布是不均匀的,其最大值及位置与厚度有关 有限厚度板中面的应力集中系数及其最大
值均大于平面应力或平面应变的应力集中系数 对含圆孔任意厚度板的应力集中问题,按平面应力或平面应
变来考虑是不安全的 Sternberg 等人对含圆孔任意厚度板的应力分布及应力集中系数的近似三维求解,仅适
用于厚度较小的板,当板超过一定厚度时同样也是不安全的.
关键词: 应力集中系数 有限元分析 有限厚度板-through 3D FEM to study with limited thickness of plate hole hole edge of the stress field, identify the stress concentration factor with the plate thickness, the radius hole of the relationship between also analyzed the edge of the hole three-dimensional and three-dimensional stress extent constrained the size of the area. The results showed : Stress from the restrictive factor in the board faced the greatest, and the surface of 0, the three-dimensional effect of the length of the regional thickness of about half of the stress concentration factor along the thickness of the distribution is uneven, and the location of its maximum thickness and the limited thickness of the slab surface stress concentration factor and the maximum value is greater than or plane stress level plane strain, the
Platform: |
Size: 59392 |
Author: 张开 |
Hits:
Description: Edge element based 2D FEM code to calculate Electromagnetic Simulations
Platform: |
Size: 1024 |
Author: danielwood |
Hits:
Description: IDE@L is a toolbox for Matlab dealing with Tree rings detection by image processing. This is a Graphical User Interface (GUI) which can help wood scientists in extracting tree rings coordinates. Version 1.0 runs under Matlab 65 (R13) and needs image processing toolbox for 揅anny?edge detection. The outputs are detected rings coordinates (.xls) which can be used by FEM software.
Unzip in a matlab path
launch using command:
ideal_gui
Enjoy !-IDE @ L is a toolbox for Matlab dealing with Tree rings detection by image processing. This is a Graphical User Interface (GUI) which can help wood scientists in extracting tree rings coordinates. Version 1.0 runs under Matlab 65 (R13) and needs image processing toolbox for grind fine anny? edge detection. The outputs are detected rings coordinates (. xls) which can be used by FEM software.Unzip in a matlab pathlaunch using command: ideal_guiEnjoy!
Platform: |
Size: 1969152 |
Author: 夜妖 |
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Description: DistMesh giving a singular FEM matrix?-Hi
Anyone here with some experience of using DistMesh in finite element code? I m solving the scalar Helmoltz equation in an annular region in 2D:
rho_1 < rho < rho_2
where rho_1 is the radius of a Perfect Electric Conducting cylinder and rho_2 is where the mesh is truncated using an Absorbing Boundary condition.
Now, I ve written code to mesh the region myself (by dividing the region into annular rings and picking a fixed number of points on each ring) and I ve written another program which uses DistMesh to mesh the region. I get a nice solution using my own meshing code but the FEM matrix becomes singular when I use DistMesh. This is the DistMesh Code I used:
Circle with hole
rABC=1.5
rCyl=0.5
fdstring=sprintf( ddiff(dcircle(p,0,0, f),dcircle(p,0,0, f)) ,rABC,rCyl)
fd=inline(fdstring, p )
box=[-2,-2 2,2]
[p,N]=distmesh2d(fd,@huniform,0.04,box,[])
I tried changing box and the 0.04 value (initial edge length). But every time, the matrix becomes sin
Platform: |
Size: 37888 |
Author: skypigr |
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