Skip to content

January 19, 2014

Lodigina N.D. Calculations of contact stresses of mating screw surfaces

Calculations of contact stresses of mating screw surfaces

Lodigina N.D.

Due to stress concentration in the contact area, there is a great deal of strain, which results in the local plastic deformation and destruction. Contact stresses take up some 80% of the total amount of stresses in strength estimation of screw mating surfaces. It is difficult to determine nominal contact stresses, so the calculations are performed by the elasticity theory methods. The contact stresses have been calculated by Hertz formulas in the longitudinal screw cross-section of a screw mechanism. The need to calculate contact stresses in the longitudinal screw cross-section is caused by total stresses of the screw, coil and contact stresses (a complex calculation technique of the stress state screw surfaces). Energy deformation analysis (the fourth theory of strength) is used as the contact strength criterion; its applicability has been proved by the experimental data. It is advisable to apply this contact stress calculation technique to all types of point-contact gearing as well as friction gearing.

Keywords: contact stresses, the contact strength, spiral surface, tangential stresses, the strength criterion of modification energy.

References

  1. Gostev E.G. A short course of materials strength. – Moskow: Nauka, 1977. – 456 p.
  2. Lodigina N.D. Investigation of the stress components screw mechanisms // Engineering industry and life safety, 2011, № 1. – P. 63-66.
  3. Lodigina N.D. Stressed state at the arbitrary point of the section of the turns of components of misaligned screw mechanisms // Engineering industry and life safety, 2011, № 2. – P. 55-57.
  4. Calculations of strength in engineering / S.D. Ponomarev, V.L. Biderman, K.K. Likhachev, etc. – Moskow: Mashgiz, Vol.1, 1956. – 884 p., Vol.2, 1958. – 974 p., Vol.3, 1959. – 1118 p.
  5. Rechetov D.N., Goller D.E., Bragin V.V. Prospects for standardization calculations gears // Bulletin of Engineering Industry. 1985, № 11. – P. 3-7.
  6. Sharapov R.V., Lodigina N.D. Stress analysis of parts misalignment screw mechanism // Fundamental research, 2009, №5. – P. 70-71.

«Engineering industry and life safety» №1 (15), 2013. Pages: 67-71

Download full text:Lodigina N.D. Calculations of contact stresses of mating screw surfaces

View russian version

Lodigina Nina Dmitrievna – Ph.D., Murom Institute of Vladimir State University, Murom, Russia. E-mail: nina.lodygina@yandex.ru

Read more from Articles
, ,


Комментарии закрыты.