懸臂梁靜電驅動分析造成網格擠壓破裂inverted mesh ~

double.a

請問要如何解決網格幾壓變形問題inverted mesh, 我想觀察電壓加到多大可以接觸到下片,但是電壓無法再加大,有試過結構網格,結果還是破裂,且會不收斂,要如何解決此問題 ,先謝謝了

TBE_Legend

试过remeshing step by step（modeling guide.pdf中P466）吗？

REMESHING STEP BY STEP
To solve using remeshing of a deformed mesh follow these steps:
1Activate the remeshing support in the application mode by setting the property Allow Remeshing to On in the Application Mode Properties dialog box.
2Specify the stop condition in the Solver Parameters dialog box.
3Solve. If the solver stops before is has reached the final time continue with the next step below.
4Next you need to create a new geometry from the deformed mesh. From the Mesh menu, open the Create Geometry From Mesh dialog box. Click the Deformed Mesh option button to use the deformed mesh as the source for the new geometry. You can choose at which time to pick the mesh but in general use the last one.
5Mesh the new geometry just created. This mesh gets a better quality than the previous deformed mesh.
6In the Solver Parameters dialog box change the initial time (or the first parameter value if you are using the parametric solver) to the last value that the solver reached.
7Click the Restart button to continue solving. This uses the previous solution as the initial value and thus continue solving where the solver had stopped.
8If the solver again stops before the final time go to Step 4 again.

double.a

TBE_Legend 版主的方法我試過,但還是無法解決網格擠壓和拉扯,改為2d電壓也是無法加大,請問有其他方法可以解決這個問題嗎?加輔助線可行嗎?  謝謝 不然只要回ansys了 ,

kinggun

对于移动网格而言，感觉你的靠近板的网格过于密集了。

TBE_Legend

Calculating the Fatigue Crack Initiation in Machine Parts under Random Multiaxial Loading
A. Nieslony1, and C.M. Sonsino2
1 Opole University of Technology, Department of Mechanics and Machine Design, Opole, Poland
2 Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF, Darmstadt


The fatigue test stand and a scheme of the specimen loadingThe authors present a method for estimating fatigue life due to crack initiation using FEM under multiaxial random loading.

The proposed method uses the multiaxial fatigue failure criteria based on the critical plane concept. Damages were determined with the spectral method from power spectral density (PSD) function of the equivalent stress history.

The authors used linear-elastic analysis of FEM for determination of the stress tensor. The proposed algorithm is verified during fatigue tests of two specimens.

Download
Download Paper (PDF 1.8 MB)

http://www.comsol.com/papers/1680/

TBE_Legend

http://www.comsol.com/papers/1060/

FEMLAB Modeling of Multiple Crack Systems
Grechka, V.1, Kachanov, M.2
1 Shell E & P, Houston, TX
2 Department of Mechanical Engineering, Tufts University, Medford, MA


Normal stressAlmost ubiquitous presence of fractures in the earth and their tendency to provide natural pathways for flow of hydrocarbons makes them an important target in exploration for oil and gas. While typical geophysical (mainly seismic) data indicate only relatively large faults, information about many small fractures of exploration interest has to be inferred from seismics by applying some effective media theories.

In this work, we use FEMLAB to compute the effective elastic properties of fractured rocks. The results of our finite element simulations are then compared with predictions of the existing effective media theories.

Download
Download Paper (PDF 211 KB)

Download Presentation (PDF 1.4 MB)

可能这两个文件对你有点用。