ABOUT INFLUENCE OF SIZE OF A BACKLASH BETWEEN A BOLT AND THE HOLE ON THE TENSION CONDITION OF A BOLT OF THE SINGLE-SHEAR BOLTED JOINT IN A "SHEARING" ZONE
DOI:
https://doi.org/10.20535/2305-9001.2013.69.28990Keywords:
bolted joints, backlash, method of finite elements, 3D contact model, stress-strain conditionAbstract
Purpose. Studying of influence of value of a backlash on a state of stress of a bolt of a single-shear bolt joint in a "shearing" zone.
Methodology. Used a method of final elements and the 3D contact model as much as possible approached to real geometry and conditions of load application.
Findings. The bolt of a single-shear bolt joint always "works" not only on a shear, and on a bending. Contact interaction of a lateral surface of a bolt with edges of apertures calls in zones of contacts in a bolt additional negative axial stresses of peak character. Even at a cycle with a constant sign on the loading in a bolt at a surface there can be a zone with cyclically sign-variable axial stresses, and they are more destructive, than with a constant sign. It changes character of fatigue failure of a bolt.
Originality. The reason of change of character of fatigue failure of a bolt is found out: separation instead of a shear.
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