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ANALYSIS OF STRESS DISTRIBUTION IN ROOTS OF BOLT THREADS Gennady Aryassov, Andres Petritshenko Tallinn University

1. Motivation. . . When threaded joints are subjected to an axial load a stress concentration in thread roots take place (Fig.1).Under ideal conditions, the tension in the screw (bolt) and the compression in the nut (such scheme of loading is designated as Bolt-Nut I (Fig.1a) should be reduced uniformly starting from full load at the first contact between screw and nut threads. The same condition is required for other schemes of loading when the screw is compressed and the nut is tensioned 35483

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ANALYSIS OF STRESS DISTRIBUTION IN ROOTS OF BOLT THREADS Gennady Aryassov, Andres Petritshenko Tallinn University

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    1. ANALYSIS OF STRESS DISTRIBUTION IN ROOTS OF BOLT THREADS Gennady Aryassov, Andres Petritshenko Tallinn University of Technology Department of Mechatronics

    2. 1. Motivation

    6. 2. Basis for calculations

    11. The kinematical displacements represented in Eq. (6) are projected to the normal of the working plane of roots of thread using delta function can be expressed as (7) where - influence function of contact pressure for bolt and nut threads, - influence function of external forces for bolt and nut threads, - width of k’s block of shape function of contact pressure, ? - angle between roots of thread.

    12. 3. Calculation results

    13. Results of calculation of load distribution on threads are given in Table 1 and are compared with calculation results according (Birger & Iosilevich, 1973), (Marujama, 1976) and to the ANSYS program, which used a standard triangular element with six nodal points. Table 1. Contact load (pressure) in roots of thread

    14. Results of the present calculation of stress distribution (MPa) in roots of thread are represented in Fig. 4.

    16. 4. Conclusion

    17. Thank you

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