Fracture and Structural Integrity: The Podcast Podcast Por Gruppo Italiano Frattura (IGF) arte de portada

Fracture and Structural Integrity: The Podcast

Fracture and Structural Integrity: The Podcast

De: Gruppo Italiano Frattura (IGF)
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 Stay at the cutting edge of fracture mechanics and structural integrity research with the official podcast of the Fracture and Structural Integrity journal. Join us for insightful interviews with top researchers, in-depth discussions of groundbreaking papers, and explorations of emerging trends in the field.All rights reserved Ciencia Educación
Episodios
  • Prediction of the tensile strength of FDM specimens based on Tsai Hill criteria

    Prediction of the tensile strength of FDM specimens based on Tsai Hill criteria
    May 22 2025
    This study investigates the mechanical behavior of 3D-printed polyethylene terephthalate glycol (PETG) polymer specimens subjected to tensile and shear testing, with a particular focus on the influence of raster orientation and shell contour. Specimens were fabricated using Fused Deposition Modeling (FDM) at three raster angles (0°, 45°, and 90°) and tested using both a mechanical extensometer and a Digital Image Correlation (DIC) system. The results indicate a significant influence of raster orientation on tensile and shear properties. 0° specimens exhibited the highest tensile strength, as the filament alignment was parallel to the loading direction. In contrast, 45° specimens demonstrated more ductile behavior. While the shell contour had minimal effect on 0° and 45° specimens, it enhanced stiffness and ductility in 90° specimens. Furthermore, the Tsai-Hill criterion was applied to predict the tensile strength at a 45° orientation. These findings contribute to a deeper understanding of the anisotropic behavior of 3D-printed materials and highlight the importance of raster orientation in optimizing mechanical performance.
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    18 m
  • Damage mechanisms in hybrid composites: experimentalcharacterisation and energy-based numerical analysis

    Damage mechanisms in hybrid composites: experimentalcharacterisation and energy-based numerical analysis
    May 21 2025
    This study analyses the failure mechanisms of bilayer hybrid composites, consisting of carbon and glass fibres embedded in an epoxy matrix, under bending loads. The objective is to evaluate how different hybrid configurations influence failure evolution and mechanical performance. To achieve this, specimens are submitted to 3-point bending tests, and 3D finite element models are developed to simulate the experimental setup. The numerical models incorporate a continuum damage mechanics model to capture intralaminar failure and a surface-based cohesive behaviour for interlaminar damage. The results show that hybrid laminates exhibit intermediate strength and displacement values compared to nonhybrid carbon and glass laminates, with the positioning of glass fibers significantly affecting bending force and displacement. Intralaminar damage is the primary failure mechanism in all configurations, followed by delamination. Additionally, placing glass fibers on the compression side reduces the overall damage, whereas placing them on the tensile side increases intralaminar failure before reaching the peak load. These findings contribute to optimizing the design of hybrid composites for bending applications by providing information about the relationship between material configuration and failure mechanisms, ultimately improving their structural efficiency and durability in engineering applications.
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    26 m
  • Parametric study on the effect of anchor’s geometry on the stress distribution and crack initiation direction in a concrete body

    Parametric study on the effect of anchor’s geometry on the stress distribution and crack initiation direction in a concrete body
    May 14 2025
    This work deals with investigations of the stress field distribution around a steel anchor embedded in a concrete. Tensile loading - pulling force of the steel anchor is considered, which is very often connected to concrete cone failure. Numerical simulations via finite element method were performed to obtain results for a large extent of geometrical configurations. In accordance with the basic idea of the maximum tangential stress criterion, the angle where this stress reaches its maximum was determined. The influence of selected geometrical parameters of the system on these angles was analyzed and it was found out that they can significantly affect the angle of the maximum tangential stress and consequently the shape of the cone failure. It was observed that the circumferential crack propagation is flatter with increasing length of the steel anchor’s embedment and with increasing anchor’s outer radius. The results obtained numerically agree sufficiently with experimental results especially when the crack direction is compared. Conclusions presented within this research are important for both design and assessment of anchor/concrete systems subjected to tensile loading.
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    13 m
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