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005			20260818113852.0
008			030815s2003 th uzm rtt 00| a1eng d
035			_a.b11894052
099		9	_aAIT Thesis no.ST-03-20
100	1		_aFung, Ngo Cheng
245	1	0	_aFinite element analysis of vetiver grass composite structures
260			_aBangkok : _bAsian Institute of Technology, _c2003
300			_a64 leaves
490	1		_aThesis ; _vno. ST-03-20
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502			_aThesis (M.Eng.) - Asian Institute of Technology, 2003
520			_aA mathematical framework has been introduced to investigate the behaviour of composite structures subject to incremental vertical loading. An analytical method has been described to predict the nine effective elastic moduli of an orthotropic composite bundle comprised of vetiver grass fibers and clay matrix. Both constituents are assumed to behave as isotropic linear elastic-brittle materials. These moduli are given in terms of the properties of both constituents as well as the cross-sectional aspect ratio and the volume fraction of the inclusions. A composite wall panel is made up of two different materials, namely vetiver grass composite bundles and clay paste joints arranged in a periodic way as a continuum. The vetiver grass composite bundles can be regarded as orthotropic elasticbrittle materials. For modelling the behaviour of wall panels, a two-stage homogenization procedure is used to obtain the average mechanical response of the composite wall panels. In the first step, composite bundles are homogenized with vertical joints to give equivalent elastic properties of a stacked system. Next, this stacked system is homogenized with horizontal joints to obtain equivalent material properties for the wall panels. This constitutive model can be incorporated into existing numerical packages to analyse vertically loaded wall panels. Three dimensional finite element analyses utilizing eightnoded solid elements are implemented in this study. The failure criterion based on the characteristic tensile strength of the composite bundles has been proposed to predict the compressive strength of wall panels. The results obtained from finite element analysis have been verified and validated with some limited experimental data, which showed a reasonable agreement. The finite element model can be used for predicting the behaviour of vetiver grass composite structures of arbitrary geometry and boundary conditions. A design of a single-story house based on this model is proposed.
650		0	_aFinite element method
650		0	_aCompositae
650		0	_aVetiver
700	1		_aBarry, William Joseph, _eChairperson
700	0		_aPichai Nimityongskul, _eExamination Committee
700	1		_aKim, Kidu, _eExamination Committee
710	2		_aLee Foundation, _eScholarship donor
710	2		_aAsian Institute of Technology-Partial Scholarship, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. ST-03-20
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B08913
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