| Author | Pitch Roongsattam |
| Call Number | AIT Thesis no.ST-06-09 |
| Subject(s) | Finite element method
|
| Note | A thesis submitted in partial fulfillment of the requirements for the
degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-06-09 |
| Abstract | Though finite element method (FEM) has been most widely used tool for decades for solution to complex engineering problems, there are number of limitations of its usability due to various inherent shortcomings. One of them is the analysis of incompressible or nearly incompressible materials such as rubber. Incompressible or nearly incompressible material exhibits no volumetric change or hardly any considerable volume change after deformation. In displacement based finite element formulation, the volumetric strain energy term of the total strain energy function act as a penalty functions and hence FEM solution becomes meaningless as zero or nearly zero volumetric change introduces severe numerical errors. This research is focused on investigating modeling of incompressible or nearly incompressible material using reduced integration and verifies the results with experimental data for special rubber compound developed in Thailand through special chemical process adding varying amount of rice husk ass (RHA). which proven to exhibit incompressible behavior under external loadings. This new rubber compound was showed remarkable improvement of its mechanical properties, which is been currently considering for possibility of replacing expensive concrete railway sleepers by rubber sleepers from Thailand railway system. Accurate and precise analysis of complex structural component made up of incompressible or nearly incompressible material such as rubber compound used in this study is increasingly demanding in order to design those structural members. The extended version of finite analysis program XFEAP was modified to accommodate reduce integration capability for two dimensional 4 node plane stressstrain element and three dimensional 8 node solid element. The numerical results were promising compared with the experimental results and simple model based on analytical results based on more complex hyper-elastic theory. With the proof of the usability of reduce integration for modeling of incompressible or nearly incompressible material models, it is now possible to analyze accurately more complex structural components such as railway sleepers, which are subjected to complex dynamic loading patters |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-06-09 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Worsak Kanok-Nukulchai;Munasinghe, Sunil; |
| Examination Committee(s) | Pichai Nimityongskul;Kato, Yoshitaka ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |