Failure of pultruded GRP bolted joints: a Taguchi analysis

Failure tests on pultruded glass-reinforced-plastic single-bolt tension joints are described. Four joint layouts, defined in terms of ratios of end distance (E) and plate width (W) to bolt diameter (D), were used. The objective was to rank the deleterious effects of four factors on joint failure loads: (a) bolt/hole clearance; (b) angle between tension and pultrusion directions; (c) elevated temperature; and (d) water immersion period. Three levels were selected for each factor: (a) 0·2, 1·2 and 2·2 mm; (b) 0degrees, 45degrees and 90degrees; (c) ambient temperature (about 20degreesC), 60degreesC and 80degreesC; (d) 0, 6·5 and 13 weeks. The joint test matrix was defined by a Taguchi three-level balanced array for four factors. Altogether 108 joints (comprising three replicates of nine joint groups, four factors and three factor levels) were fabricated and tested. Four methods were used to rank the effects of the factors. Their rank order (highest to lowest) was identified as: elevated temperature, water immersion period, bolt/hole clearance, and angle between tension and pultrusion directions. Environmental factors were shown to reduce failure loads by up to 93%.


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  • Accession Number: 01144142
  • Record Type: Publication
  • Source Agency: TRL
  • Files: ITRD
  • Created Date: Nov 16 2009 12:30PM