000			02975nam a2200373 4500
005			20260818170352.0
008			270898 th eng
035			_a.b10472794
099		9	_aAIT Thesis no.ST-90-04
100	1		_aCheung, Chiu Lun
245	1	0	_aObservation of crack growth from anchor bolt by laser speckle method and application of fracture mechanics
260			_aBangkok : _bAsian Institute of Technology, _c1990
300			_a77 p.
490	1		_aThesis ; _vno. ST-90-04
500			_aA thesis submitted in partial fulfillments of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1990
520			_aPullout test of anchor bolt is carried out _on concrete specimen to have the complete crack growth. Experimental and theoretical studies are conducted with a main objective to clarify its major mechanism of fracture. Using the laser speckle method, the length of macrocrack and the distribution of crack opening displacement are measured. It is found that the initiation of crack is under mixed mode and contains both normal opening component and shear sliding component. With progression of fracture, the normal opening component dominates the shear sliding. The prediction by Dugdale-Barenblatt-type model with linear tension-softening relation for pure mode I is compared with the experimental results. The prediction is far from the experimental results when the used critical opening displacement value is 25 æm . On the other hand, a rea sonable agreement is obtained when the value is 2 æm for the linear tension-softening relation. The crack path is determined from the experimental result to avoid the heavy computation for tracing the crack path. The corresponding process zone size is small. Accordingly, linear elastic fracture mechanics is applicable to this problem. The agreement of the results of LEFM with the results obtained from process zone model and with the experimental results are satisfactory.
650		0	_aFracture mechanics
700	1		_aHorii, Hideyuki, _eChairperson
700	1		_aUeda, Tamon, _eExamination Committee
700	0		_aPichai Nimityongskul, _eExamination Committee
810	2		_aAsian Institute of Technology. _tThesis ; _vno. ST-90-04
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B18543
907			_a.b10472794 _bmnait _cs
902			_a240402
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945			_lmnait
945			_lmnarc
942			_c22
942			_c40
909			_aBarcode : 30050120692701 _bCREATED : 2014-02-04 _cRECORD # : i12786019 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050160069083 _bCREATED : 2016-08-04 _cRECORD # : i12930283 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
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