Crack propagation in two-belt beams

S. V. Shkaraev, B. A. Sergeev, S. D. Poznyshev

Research output: Contribution to journalArticlepeer-review


The FEM was used to construct a detailed model of contact interaction of a fastening element and the web of a two-belt beam. The super element approach was used as a base for evaluating the SIF in separation and SIF in transverse shearing for cracks in the zone of the fastening hole of the longitudinal joint and in the belt. The results show that inclined cracks (type A) are situated in the normal opening conditions, whereas the vertical (type C) and horizontal (type D) cracks are in the conditions with mainly transverse shear. The nature of crack propagation depends strongly on the material of the web of the beam. For example, in type D16 material in which cracks can grow by the shear mechanism in a wide range of the values of SIF, the type C and D cracks propagate linearly. The predicted rate of their growth is considerably (15-60 times) higher than the rate of growth of opening cracks. This is caused both by a lower-resistance of the material to propagation of fatigue cracks by the shear mechanism and by adding up all the values of kII in the opposite loading half cycles. However, if the wall is made of V95-type material in which straight growth of shear cracks takes place only in pure shear conditions the type C and D cracks rotate during growth and degenerate to a separation crack propagating at a considerably low rate.

Original languageEnglish (US)
Pages (from-to)275-279
Number of pages5
JournalSoviet Materials Science
Issue number3
StatePublished - May 1992
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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