Fatigue crack growth in aluminum alloy from cold expanded hole with preexisting crack

Ясній, Петро Володимирович; Dyvdyk, Oleksandr; Semenets, O. I.; Yasnii, V. P.; Antonov, A. A.

doi:10.33108/visnyk_tntu2020.03.005

Cited by 1 publication

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cold working expansion process was realized by forcing a hard steel ball of 6 mm inside a predrilled hole. P. Yasniy, O. Dyvdyk et al [19] adopted an experimental technique to examine the impact of cold expansion holes in D16chT aluminum alloy plates with a pre-existing quarter-elliptical crack on fatigue crack growth and residual life. It was found that cold expansion of the hole with an expansion ratio of 2.7% significantly retarded the fatigue crack growth rate and increased residual lifetime by three times.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Effectiveness of Combined Surface Treatment Methods for Structural Parts with Holes to Enhance Their Fatigue Life

Grebenikov,

Humennyi,

Svitlychnyi

et al. 2024

Computation

View full text Add to dashboard Cite

The typical and most widespread stress concentrators in the lower wing panels of aircraft are the drain holes located on the stringer vertical ribs. These are prime sources for the initiation and development of fatigue cracks, which lead to early failure of the wing structure. Therefore, improving fatigue life in these critical areas is one of the significant issues for research. Two combined methods of surface plastic treatment in the location around drain holes are discussed in this paper. Using the finite element method and ANSYS software, we created a finite element model and obtained nonlinear solution results in the case of tension in a plate with three holes. In addition, the development of residual stress due to the surface plastic treatment of the hole-adjacent areas was taken into account. In this paper, it is shown that after surface treatment of the corresponding areas of the holes, residual stress, which exceeds the yield stress for the plate material, is induced. When combined with alternative tensile stress, these reduce the amplitude of the local stresses, thus increasing the number of stress cycles before failure. The benefits of this technology were confirmed by fatigue test results, which include the fatigue failure types of the plates. Graphs showing the impact of applicable surface treatment combined methods on the number of cycles to failure were also plotted.

show abstract

Section: Introductionmentioning

confidence: 99%