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Related Concept Videos

Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Indirect Fabrication of Lattice Metals with Thin Sections Using Centrifugal Casting
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Lattice Structures-Mechanical Description with Respect to Additive Manufacturing.

Karel Ráž1, Zdeněk Chval1, Mathis Pereira2

  • 1Faculty of Mechanical Engineering, Regional Technological Institute, University of West Bohemia, Univerzitni 2732/8, 301 00 Plzen, Czech Republic.

Materials (Basel, Switzerland)
|November 9, 2024
PubMed
Summary
This summary is machine-generated.

Lattice structures offer a sustainable, lightweight solution for engineering applications. Finite element simulations accurately predict the performance of 3D-printed lattice designs, with experimental validation showing less than 8% error.

Keywords:
MJFadditive manufacturingcompressionlattice structures

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Area of Science:

  • Materials Science and Engineering
  • Mechanical Engineering
  • Additive Manufacturing

Background:

  • Lattice structures, with their repetitive interlocking patterns, offer an optimal balance of strength, flexibility, and reduced weight.
  • Their customizable nature, from 2D honeycombs to 3D TPMS, and compatibility with additive manufacturing make them material-efficient and cost-effective.
  • These structures demonstrate high resilience, energy absorption, and impact resistance, crucial for aerospace and automotive applications.

Purpose of the Study:

  • To demonstrate the principles of creating finite element simulations for 3D-printed lattice structures.
  • To compare simulation results with experimental testing of lattice structures, including those filled with powder.
  • To analyze the efficiency and sustainability of lattice-based designs in material and energy usage.

Main Methods:

  • Development of finite element simulations for lattice structures.
  • Experimental testing of 3D-printed specimens using the multi jet fusion method.
  • Analysis of three configurations: solid material, pure lattice, and lattice filled with powder (PA12GB).

Main Results:

  • Experimental findings show a simulation error of less than 8% when compared to real measurements.
  • The primary cause of error is attributed to the use of an isotropic material model instead of an anisotropic one for PA12GB.
  • Lattice structures maintain stiffness even when filled with powder, indicating minimal impact from the filler material.

Conclusions:

  • Finite element simulations provide a reliable method for predicting the mechanical behavior of 3D-printed lattice structures.
  • Lattice-based designs offer significant ecological and economic benefits due to efficient material and energy use.
  • The study validates the effectiveness of lattice structures as a sustainable engineering solution across various industries.