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Related Concept Videos

Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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Elastic Curve from the Load Distribution01:16

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The structural behavior of beams under distributed loads is critical for engineering analysis, which focuses on predicting how beams bend and react under such conditions. Different types of beams (e.g., cantilever, supported, or overhanging) behave differently under distributed load conditions.
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Deflection of a Beam01:19

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Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
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Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

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The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
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Beams with Unsymmetric Loadings01:17

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Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
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Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
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Indirect Fabrication of Lattice Metals with Thin Sections Using Centrifugal Casting
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Scalable, process-oriented beam lattices: generation, characterization, and compensation for open cellular

Ian R Woodward1, Catherine A Fromen1

  • 1Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware, United States of America.

Additive Manufacturing
|November 8, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces an integrated framework for advanced additive manufacturing of complex lattice structures. The developed process control strategy significantly improves dimensional accuracy in 3D printed parts.

Keywords:
Digital light processing (DLP)Functional gradingLattice skinOpen lattice structurePrintable relative density

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Area of Science:

  • Materials Science and Engineering
  • Additive Manufacturing
  • Computational Modeling

Background:

  • Additively manufactured lattices show potential for diverse applications but require integrating digital design and physical fabrication knowledge.
  • Existing methods often necessitate support structures and complex post-processing, hindering efficient production of intricate lattice designs.

Purpose of the Study:

  • To propose an integrated framework for processing self-supporting, open lattice structures without external supports.
  • To develop a design strategy for uniform lattices with conformal skins and evaluate printability across various scales.
  • To investigate dimensional fidelity and implement a functional grading strategy for process control.

Main Methods:

  • Developed a minimal design strategy for uniform lattice structures with conformal open lattice skins.
  • Utilized Continuous Liquid Interface Production (CLIP™) on a Carbon M1 to evaluate printability of five lattice types (0.5-3.5 mm unit cell scale, 0.11-1.05 mm strut diameter).
  • Examined dimensional fidelity of cubic lattices and applied an iterative functional grading strategy with a naïve process model.

Main Results:

  • Printability was assessed for diverse lattice structures across specified scales and strut diameters.
  • Dimensional fidelity varied with length scales and part position due to physical processing artifacts.
  • An iterative functional grading strategy reduced planar strut radius deviation by approximately 85% after two iterations.

Conclusions:

  • The integrated framework facilitates the production of high-quality, complex lattice structures with improved digital-physical processing integration.
  • The functional grading strategy effectively compensates for dimensional deviations, enhancing part accuracy.
  • The findings are transferable to other additive manufacturing processes and lattice designs, lowering production barriers.