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УДК 519.6


Rudakov K., Dobronravov A.
National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv, Ukraine ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it )

 

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

 


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.

Keywords: bolted joints; backlash; method of finite elements; 3D contact model; stress-strain condition

 

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