By Robert M. Jones (auth.), I. H. Marshall (eds.)
The papers contained herein have been awarded on the First foreign convention on Composite buildings held at Paisley university of expertise, Paisley, Scotland, in September 1981. This convention was once organised and backed by means of Paisley collage of know-how in organization with The establishment of Mechanical Engineers and The nationwide Engineering Laboratory (UK). There could be little question that, inside engineering circles, using composite fabrics has revolutionised conventional layout strategies. the power to tailor-make a cloth to fit triumphing environmental stipulations when preserving enough reinforcement to resist utilized loading is definitely an enticing proposition. major weight discount rates is additionally accomplished through advantage of the excessive strength-to-weight and stiffness-to-weight features of, for instance, fibrous kinds of composite fabrics. Such discount rates are basically of paramount value in transportation engineering and particularly plane and aerospace functions. in addition to this massive structural capability the engineer needs to settle for an elevated complexity of research. All too usually some time past this has dissuaded the dressmaker from contemplating composite fabrics as a attainable, or certainly greater, replacement to conventional engineering fabrics. Inherent prejudices in the engineering career have additionally contributed, in no small manner, to a definite wariness in appreciating the benefits of composites. despite the fact that, the capability advantages of composite fabrics are inescapable. The final 20 years have obvious a stupendous raise within the use of composites in almost each quarter of engineering, from the excessive expertise v vi Preface aerospace program to the fewer hard structural cladding situation.
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Extra resources for Composite Structures
J. and MATlHEWS, F. L. The effect of stacking sequence on the pinbearing strength in glass fibre reinforced plastic, J. 11, 1977, April, p. 139. 15. WILSON, D. W. and PIPES, R. B. Behavior of composite bolted joints at elevated temperature, University of Delaware Center for Composite Materials, NASA Contract Report No. 159137, September 1979. 16. WILSON, D. , PIPES, R. , WEBSTER, J. W. and RIEGNER, D. L. Mechanical characterization of PMR-15 graphite/polyimide bolted joints, Proceedings of ASTM Symposium on Test Methods and Design Allowables for Fibrous Composites, Dearborn, Michigan, October 3-4, 1979.
AIGR RADUS INSIDE 11m Thickness effect on bolt down . 7 P • LARGE RAD US 2SP -RIBS TOTAL SYSTEM COMPONENT DEVELOPMENT FIG. 11. P IImlAL • IHPflOVEO PROCESS < IHAIOVE D CCH'OJIID Generalised cross-section of component. BP 30 John Humphreys sufficiently. Further experiments with changes to the compound formulation and incorporated fibres gave further improvements, but still not adequate for the specified duty. However, fibre attrition was now minimal and the actual failure stress was comparable with that predicted; any further improvements would have to be from changed component design.
CONCLUDING REMARKS In addition to all the quantifiable factors which must be satisfied before composite materials are used as regular engineering materials is the intangible, but daunting factor, of what can be called the 'technology gap' which if not bridged engenders a total lack of designer confidence. With composite materials there is a 'materials maze' in which much of the technology presently resides with the material suppliers and/or moulders and is often of a form or a technical language not readily assimilated by the busy engineer.