The stress analysis of a truck frame bracket Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ks65hh48b

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  • In the construction of a cab-over-engine semi tractor, Freightliner Corporation of Portland, Oregon uses brackets to make the connection between the front leaf spring mounts, bumper, front hinges for the tilt-cab and the longitudinal frame rails. One bracket is used on each side. The integrity of these brackets is essential to the safe operation of the truck. This investigation was undertaken to make an estimate of the stress levels in some special brackets during the various possible load combinations which simulate actual operation. This estimate will be used to justify further more precise measurements of the stresses in the brackets. The geometry of the brackets was too complex to use analytical methods and, also, the prototypes were not available. Quarter scale photoelastic models were built from laminated sheets of epoxy. This kind of model enables one to detect flat plate bending as well as in-plane tension and compression stresses with a reflection polariscope. After the critical load combination was determined from these models, a second model was prepared and stress frozen to determine the magnitude and location of the maximum stress occurring in the bracket. Dimensional analysis was used to relate the model properties to the prototype. The results of this investigation indicated that stress levels higher than the yield strength of the material would occur in the right-hand bracket when braking during a right turn. Strain gages should be applied at the point of maximum stress so that the actual stress in the bracket can be measured for this particular loading condition.
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