Journal: The Minerals, Metals & Materials Series

Abbreviation

MMMS

Publisher

Springer

Journal Volumes

ISSN

2367-1181
2367-1696

Description

Filters

2021 - 20256
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Publications 1 - 6 of 6
  • Toward Neural Network Models to Model Multi-phase Solids
    Item type: Conference Paper
    Gorji, Maysam B.; Heidenreich, Julian N.; Mozaffar, Mojtaba; et al. (2021)
    The Minerals, Metals & Materials Series ~ Forming the Future
    In this study, a neural network model is developed to describe the large deformation response of a multi-phase material, i.e., a two-dimensional perforated plate. Using the finite element, virtual experiments are performed to generate stress–strain data for monotonic biaxial loading paths. Subsequently, a combination of fully connected and recurrent neural network models are trained and validated using the results from the virtual experiments. The predictions of a network show a remarkable good agreement with all the experimental data. The suggested neural network-based constitutive model does provide a robust solution to the problem at hand, providing a fully anisotropic, three-dimensional material model capable of covering all physical material properties. The suggested procedure promises to be generally applicable to any material class and can be paired with any numerical method.
  • Investigating the Influence of Iron Content on the Microstructure and Mechanical Properties of a High Strength Al-Alloy for Additive Manufacturing
    Item type: Conference Paper
    Turani, Matteo; Jannic, Walter; Esteves, Paulo Davi Borges; et al. (2024)
    The Minerals, Metals & Materials Series ~ Light Metals 2024 (TMS 2024)
    Scalmalloy (R), a 5xxx series aluminum alloy modified with Sc and Zr to suit additive manufacturing needs, displays significant potential for automotive and aerospace applications due to its exceptional strength, low density, and resistance to corrosion. This study investigates the impact of iron, a prevalent impurity in secondary aluminum, on the microstructure and mechanical properties of Scalmalloy (R) produced via laser powder bed fusion (PBF-LB). Three Scalmalloy (R) variations were examined: the original composition and two modified versions with a total Fe content of 1.8 and 3.5 wt.%. Microstructural analysis through electron microscopy and X-ray diffraction unveiled the existence of metastable Fe-rich precipitates at mid-low Fe concentrations, while stable Al-Fe intermetallics were observed in the variant with high Fe content. The influence of these distinct microstructures was assessed using hardness and compressive tests. These assessments demonstrated augmented material strength at room temperature when increasing the Fe content in the composition for both as-built and peak-aged conditions. However, this enhancement diminished when the alloy containing 3.5wt% Fe was subjected to compression at 300.C, resulting in outcomes comparable to the alloy with a Fe content of 1.8 wt.%. These findings contribute to an enhanced comprehension of the properties of commercial aluminum alloys containing trapped impurities, which hold the potential to expand the utilization of secondary aluminum alloys within the additive manufacturing industry.
  • Time-Dependent Method for the Inverse Evaluation of Yield Locus Using Nakazima Experiments
    Item type: Conference Paper
    Barth, Konrad; Berisha, Bekim; Hora, Pavel (2022)
    The Minerals, Metals & Materials Series ~ NUMISHEET 2022: Proceedings of the 12th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes
    The position of the plane strain (PS) point in the stress space depends on the choice of the yield locus. Using non-quadratic yield loci the curvature and therefore the location of PS are determined by the yield locus exponent. On the contrary, the Vegter yield locus offers the opportunity to define exactly the position of PS. Currently, to use this freedom cost-expensive experiments have to be conducted or the position is roughly approximated. In this work, a new method is described to determine the two stress components of the plane strain point for the aluminum alloy AA6016-T4. The time-dependent strain distributions of Nakazima experiments recorded by an optical measurement system are used to conduct a reverse fitting of the PS point. Different strategies of determining the PS point using this new method are compared.
  • Comparison of Linear Regression and Neural Networks as Surrogates for Sensor Modeling on a Deep Drawn Part
    Item type: Conference Paper
    Ryser, Matthias; Bambach, Markus (2021)
    The Minerals, Metals & Materials Series ~ Forming the Future. Proceedings of the 13th International Conference on the Technology of Plasticity
  • Fast Development of New Alloys for Metal Forming Using Additive Manufacturing
    Item type: Conference Paper
    Sviridov, Alexander; Sizova, Irina; Bambach, Markus (2021)
    The Minerals, Metals & Materials Series ~ Forming the Future
    The industrial development of new materials in metal forming is a time consuming, iterative process. Although it is already being attempted to predict the properties of new materials using computational methods, experimental production and characterization must always be carried out. This typically involves casting of larger blocks of material, which are then processed to specimens. Particularly in the case of high-alloyed materials (e.g., nickel-base superalloys) pronounced macrosegregations occur, which must be removed by time-consuming homogenization. In this paper, additive manufacturing of small specimens is investigated as an alternative to traditional ways for developing new alloys for metal forming. The microstructure and thermomechanical transformation behavior of as-built material are analyzed and it is shown that thermomechanical treatment of the as-built state allows for transforming the microstructure in such a way that processing parameters for forming and final product properties can be identified.
  • Exceptional Strength of Mycelium-Bound Composite: A Sustainable Brick Alternative for Construction
    Item type: Conference Paper
    Sharma, Deepak; Le Ferrand, Hortense (2025)
    The Minerals, Metals & Materials Series ~ Natural Fibers and Biocomposites
    Mycelium-boundMycelium-bound compositescompositesComposite (MBCs) are grown by fungi onto waste lignocellulosic substrate and hence hold significant potential as sustainable materials. However, their wide range of adoption is limited by their typically low strength. Low strength in MBCs is due to the root-like networks of hyphae. The mycelium filaments loosely bind the organic structure, resulting in a porous and lightweight material that lacks the rigidity required for structural applications. This study develops a new method to fabricate MBCs. We use additive manufacturingAdditive manufacturing to fabricate porous triply periodic minimal surface (TPMS) scaffolds from wood-Poly Lactic Acid (PLA) material. The porous TPMS structure provides a higher surface area and a continuous supply of nutrition and oxygen for mycelium development. Mycelium from Ganoderma lucidum is grown on porous structures for 21days. This study considers two types of TPMS structures: gyroid (G) and inverted wrapped package (IWP). The resultant MBCs showed exceptional strength of 14MPa, comparable to clay bricks. A comparison between porous structure with and without mycelium showed a 1.27 times improvement in peak strength for the G structure and 1.30 times for the IWP structure at 50% relative density. Mycelium growth depends on the relative density of the organic porous structure, with a maximum mycelium density on 10% and a minimum on 50% porous structure, respectively. Furthermore, results showed mycelium growth is dependent on the design of the porous structure, which opens an avenue for advanced and engineered MBCs. 2025 Elsevier B.V., All rights reserved.
Publications 1 - 6 of 6