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Experimental Studies Into the Durability of the Elements of Vehicle Frames Under Complex State of Loads
Sector:
Language:
German
Abstract
So far, permissible stress in the form of Wöhler's curves
have been determined on very simple samples and under single load,
e.g. at bilateral bending, torsion, tension etc. Hence, their
uselessness is rather obvious when thin-walled structures
consisting of rods subject to a complex state of loads.
This paper presents the results of studies into the durability
of thin-walled elements of frames for different values of the
quotient of torsional loads-to-loads bending the frame. Studies
were performed on a special stand which allowed to widely change
both torsional and bending loads and their relation - such in the
same way as it happens when vehicle travels along the road. The
results are given in the Wöhler's diagrams form and in
analytical way as well. It has been demonstrated that permissible
fatigue stresses for the tested elements of frame differ
considerably from those published in Standards and Regulations