Natural frequencies of vibration in cracked Timoshenko beams within an elastic medium Articles uri icon

publication date

  • April 2022

start page

  • 103257

end page

  • 103267

volume

  • 118

International Standard Serial Number (ISSN)

  • 0167-8442

Electronic International Standard Serial Number (EISSN)

  • 1872-7638

abstract

  • This work analyzes the dynamic behavior of cracked Timoshenko beams immersed in a Winkler elastic medium,
    obtaining their natural frequencies of bending vibration. For this purpose, the beam is modeled as two
    segments connected in the cracked section by two massless springs, one extensional and another one rotational.
    Their stiffnesses are proportional to the shear force and bending moment transmitted through the cracked
    section, respectively, considering the discontinuity of vertical displacement and rotation due to bending. The
    differential equations for the free vibration are solved by applying the corresponding boundary conditions and
    the compatibility conditions of the cracked section. The proposed methodology allows calculating the natural
    frequencies of vibration as a function of the type of support, the parameter defining the stiffness of the elastic
    soil, the crack position and the initial length of the crack. The results obtained are compared with those
    published by other authors who model the crack in a simplified way, showing the interaction and importance
    of the parameters considered in the natural frequencies of the system.

subjects

  • Mechanical Engineering

keywords

  • timoshenko beam; natural frequencies of vibration; cracked beams; winkler elastic medium