Experimental Investigation of Crack Propagation Mechanisms in Commercially Pure Aluminium Plates

2019
Tekoğlu, C.
Çelik, Ş.
Duran, H.
Efe, M.
Nielsen, K.L.
The crack surface morphology in tearing of ductile metal plates depends on the mechanical properties, chemical composition and the microstructure of the plate material as well as on the loading conditions and the specimen geometry. This study assesses the crack surface morphologies observed in commercially pure aluminium plates (Al 1050 H14). Mode I tearing was performed in both single and double edge notched tensile test setups with specimens cut from five different plates with different thickness t, viz. t is an element of {0.5, 1, 3, 4, 5} mm. In each combination, the long axis of the notch was either parallel (0 degrees) or perpendicular (90 degrees) to the rolling direction. Fractographs showed that, for specimen thicknesses smaller than 5 mm, the crack had a cup-cup morphology almost throughout its entire length for 0 degrees specimens, while slanted crack propagation was visible in some regions of 90 degrees specimens. For t = 5 mm, on the other hand, the dominant crack morphology was slanted for both directions, the extent of the cup-cup regions being larger for 0 degrees specimens. The crack morphologies were repeatable for each direction-thickness combination, while also being consistent for both test setups having different loading conditions. (C) 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review line: Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers.

Suggestions

Biocompatibility and biomechanical properties of new polycaprolactone-bioglass based bone implant materials
Erdemli, Özge; Tezcaner, Ayşen; Department of Engineering Sciences (2007)
Researches on bone defects are focused on the use of composites due to the composite and well-organized hierarchical structure of the bone. In this study, it is aimed to develop Polycaprolactone based implants with different organic DBM, HYA- and/or inorganic bioglass, calcium sulfate- compositions for augmenting bone healing. Bioactivity of the discs was evaluated by scanning electron microscopy and EDS analysis after incubation in SBF for 1, 7 and 14 days. All bioglass containing groups showed apatite mo...
Investigation of crack growth along curved interfaces in L-shaped composite and polymers
Yavas, D.; Gozluklu, B.; Çöker, Demirkan (2014-01-01)
Delamination in unidirectional L-shaped composite laminates is modeled with two L-shaped polycarbonate plates bonded to each other where the effect of pre-crack length on the stability of the crack growth is investigated experimentally and computationally. In the experimental study, a unique testing fixture with a sliding platform is designed to create a pure vertical displacement to one of the arms. The full-field technique of photoelasticity is used in order to visualize isochromatic fringe pattern around...
Experimental investigation of failure mechanism in cross-ply and fabric curved composite laminates
Çevik, Ahmet; Çöker, Demirkan; Department of Aerospace Engineering (2021-8)
Laminated curved-shape composite parts which are used in the spar and ribs in aircraft and wind turbine blades are subjected to high interlaminar tensile and shear stresses. These stresses cause delamination and subsequent reduction in load-carrying capacity. In this study, failure mechanism of cross-ply and fabric curved composite laminates under pure transverse loading are examined experimentally using an in-house designed test fixture. Stress field over the curved beam is obtained with finite element ana...
Free flexural( or bending) vibrations analysis of doubly stiffened, composite, orthotropic base plates and panels (in aero-structural systems)
Çil, Kürşad; Yüceoğlu, Umur; Department of Aerospace Engineering (2003)
In this Thesis, the problem of the أFree Vibrations Analysis of Doubly Stiffened Composite, Orthotropic and/or Isotropic, Base Plates or Panels (with Orthotropic Stiffening Plate Strips)ؤ is investigated. The composite plate or panel system is made of an أOrthotropic and/or Isotropic Base Plateؤ stiffened or reinforced by adhesively bonded أUpper and Lower Orthotropic Stiffening Plate Stripsؤ. The plates are assumed to be the أMindlin Platesؤ connected by relatively very thin adhesive layers. The general pr...
Experimental Comparison of Performances of Three Different Plates for Gasketed Plate Heat Exchangers
Sert, İsmail Ozan; Sezer Uzol, Nilay; Güvenç Yazıcıoğlu, Almıla; Kakaç, Sadık (2012-06-01)
In this study, an experimental set-up for testing chevron type gasketed plate heat exchangers is utilized to investigate the thermal and hydraulic characteristics of different plate geometries. The experiments can be performed using various number of plates and wide range of plate sizes. The experiments are carried out for different temperatures, flow rates, and number of plates so that the Reynolds numbers (300-5250) and Prandtl numbers varies for all plates that have 30 degrees of chevron angle. Correlati...
Citation Formats
C. Tekoğlu, Ş. Çelik, H. Duran, M. Efe, and K. L. Nielsen, “Experimental Investigation of Crack Propagation Mechanisms in Commercially Pure Aluminium Plates,” 2019, vol. 21, p. 2, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/58148.