Year

1970

Degree Name

Master of Engineering

Abstract

The purpose of this investigation was to examine design methods which may be used to study stresses which occur in transportation vehicles. The major area of uncertainty in this field occurs in relation to dynamic aspects and it was determined to apply the use of the moire fringe technique in conjunction with models to study impact and vibration effects in structura^l members. The basic geometry of the moire pattern is noted. The methods and principles employed by previous workers to study statically loaded structures are investigated to establish the techniques required for moire analysis. These principles are then applied to models subjected to dynamic forces, making use of high speed cameras. Vibration studies are undertaken over a range of forced steady cycles which prove the application of the technique to high speed deflection of members. The suitability of plastics for use in dynamic work is also examined. The principles are then applied to analysis of impact deflection by means of a drop weight on a cantilever beam. The results show excellent agreement of the deflection impulse obtained by the moire method as compared with deflection measured by a linear transducer. General techniques are established for the excitation and impacting of structural models and for recording of the moire fringe pattern. A list of references relating to analysis of structural members used in transportation vehicles and also to impact studies has been compiled and is included in Appendix 4 for possible future work.

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