共查询到6条相似文献,搜索用时 0 毫秒
1.
C. A. Sciammarella B. Singh B. Trentadue F. M. Sciammarella 《Experimental Mechanics》2000,40(1):15-21
The research work presented in this paper deals with the determination of the stress concentration at the root of the fillet
of a weldment on a T steel specimen. A finite element model was developed for the specimen. Measurements were carried out
using the holographic moiré technique. Strain gages were added to evaluate extrapolation techniques proposed in the literature.
Good agreement was found between the finite element results and the optically measured values. The strain gage extrapolation
technique yielded very low values. 相似文献
2.
THERANDOMVARIATIONALPRINCIPLEINFINITEDEFORMATIONOFELASTICITYANDFINITEELEMENTMETHODGaoHang-shan(高行山)(NorthwestenPolytechnicalU... 相似文献
3.
Sutthisak Phongthanapanich Suthee Traivivatana Parinya Boonmaruth Pramote Dechaumphai 《Acta Mechanica Sinica》2006,22(2):138-147
Based on flux-based formulation, a nodeless variable element method is developed to analyze two-dimensional steady-state and
transient heat transfer problems. The nodeless variable element employs quadratic interpolation functions to provide higher
solution accuracy without necessity to actually generate additional nodes. The flux-based formulation is applied to reduce
the complexity in deriving the finite element equations as compared to the conventional finite element method. The solution
accuracy is further improved by implementing an adaptive meshing technique to generate finite element mesh that can adapt
and move along corresponding to the solution behavior. The technique generates small elements in the regions of steep solution
gradients to provide accurate solution, and meanwhile it generates larger elements in the other regions where the solution
gradients are slight to reduce the computational time and the computer memory. The effectiveness of the combined procedure
is demonstrated by heat transfer problems that have exact solutions. These problems are: (a) a steady-state heat conduction
analysis in a square plate subjected to a highly localized surface heating, and (b) a transient heat conduction analysis in
a long plate subjected to a moving heat source.
The English text was polished by Yunming Chen. 相似文献
4.
Cracking analysis of fracture mechanics by the finite element method of lines (FEMOL) 总被引:1,自引:0,他引:1
The Finite Element Method of Lines (FEMOL) is a semi-analytic approach and takes a position between FEM and analytic methods.
First, FEMOL in Fracture Mechanics is presented in detail. Then, the method is applied to a set of examples such as edge-crack
plate, the central-crack plate, the plate with cracks emanating from a hole under tensile or under combination loads of tensile
and bending. Their dimensionless stress distribution, the stress intensify factor (SIF) and crack opening displacement (COD)
are obtained, and comparison with known solutions by other methods are reported. It is found that a good accuracy is achieved
by FEMOL. The method is successfully modified to remarkably increase the accuracy and reduce convergence difficulties. So
it is a very useful and new tool in studying fracture mechanics problems.
The English text was polished by Yunming Chen. 相似文献
5.
R.K. Annabattula 《Journal of the mechanics and physics of solids》2010,58(4):447-465
Buckling of thin films on a rigid substrate during use or fabrication is a well-known but unwanted phenomenon. However, this phenomenon can also be exploited to generate well-controlled patterns at the micro and nano-scale. These patterned surfaces find various technological applications such as optical gratings or micro/nano-fluidic channels. In this article, we present a numerical model that accounts for the buckling-up of pre-strained thin films by a reduction of the interface toughness and the subsequent bond-back. Channels are formed whose dimensions can be controlled by tuning the film dimensions, film thickness and stiffness, the eigenstrain in the film and the cohesive interface energy between the film and the substrate. We will show how the buckling-up and draping back processes can be captured in terms of a limited set of dimensionless parameters, providing quantitative insight on how these parameters should be tuned to generate a specified channel geometry. 相似文献