Elastic-Plastic Analysis and Identification of Circular Tubes Using DEM

• Main Authors: Wu, Chyan-Chyi, 吳乾埼
• Other Authors: Chiang D.Y.
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/69597526963150884905

碩士 === 國立成功大學 === 航空太空工程學系 === 84 === Most theoretical models proposed for describing cyclically elastic- plastic stress-strain material behavior have the disadvantage of being too complex to implement efficiently and reliably, and therefore their applicability to more complicated elastic-plastic structural analysis can be expected to be impractical. One of the purposes of this research project is to apply the physically motivated and well behaved multi- axial Distributed-Element Model（DEM）to the elastic-plastic analysis of structural systems. By dealing with the response of thin- walled tubes that are cyclically bent into plastic range, we study the validity and effectiveness of the DEM in structural analysis. Various modeling methods will be applied to model the uniaxial cyclic-bending behavior of a thin-walled tube, in order to understand its possible physical response mechanisms. In addition, based on the multi- axial DEM, studies of biaxial response behavior of a thin-walled tube will be performed under conditions such as bending in two orthogonal directions, bending with axial force, and bending with tension, ect. The results obtained from these studies will not only improve the accuracy and reliability of practical engineering analyses, but also provide useful insight into the structural failure theory and the physical response behavior of structural systems.