Modeling of Surface Crack Defects Developed on Shear Edge in High-strength Automotive Steel Sheets

Goto, Sota; Yamazaki, Kazuhiko; Doan, Thi-Huyen; Funakawa, Yoshimasa; Umezawa, Osamu

doi:10.2355/isijinternational.isijint-2019-326

Cited by 1 publication

(1 citation statement)

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“…To study the geometric deviations in the perforation edges and their further influence on the natural oscillations of the perforated surfaces, their fractography has been carried out [33][34][35]. Opta-tech × 2000 microscope was used for research (Figure 10).…”

Section: Fractography Of Perforated Surfacesmentioning

confidence: 99%

Identification of the Natural Frequencies of Oscillations of Perforated Vibrosurfaces with Holes of Complex Geometry

Kharchenko,

Samborski,

Kharchenko

et al. 2023

Materials

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The reliability of perforated vibrosurfaces is one of the main parameters of the efficiency of their operation in many technological processes. Existing methods for studying vibrosurfaces with standard single holes and the corresponding results cannot be used to study the reliability of vibration surfaces with holes of complex geometric shapes. The proposed method is based on the experimental modal identification of the parameters of natural oscillations, the parallel creation of a numerical model using the finite element method, and the comparison of the results. Three vibrosurfaces were investigated: solid without holes, perforated with standard round holes, perforated with holes in the form of a five-petal epicycloid. As a result of experiments, the divergence of natural vibrations of perforated surfaces depending on the side of the punch and matrix during their technological production by pressing was established. The result of the research was a refined adequate numerical model that takes into account the presence of holes in complex geometric shapes. A methodology has been developed, and analytical expressions with perforation coefficients have been obtained, which allow obtaining values of natural oscillations of vibration surfaces depending on the properties of metal, boundary conditions, and structural and kinematic parameters.

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Section: Fractography Of Perforated Surfacesmentioning

confidence: 99%