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Related Concept Videos

Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

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Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
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Microcracking in Concrete01:20

Microcracking in Concrete

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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Stress: General Loading Conditions01:15

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To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
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Compacting Factor test01:22

Compacting Factor test

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The compacting factor test is a method used to assess the workability of concrete. It is  especially suitable for concrete mixes containing aggregates up to one and a half inches in size. This test involves specialized equipment consisting of two truncated cone-shaped hoppers and a cylinder, all with polished interior surfaces to minimize friction.
The procedure begins by placing concrete into the upper hopper without any compaction. Once filled, the bottom door of this hopper is opened,...
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Cellular Structures Analysis Under Compression Test.

Maria C Bedoya1, J William Restrepo1, Luis V Wilches1

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Summary
This summary is machine-generated.

This study explored polymer lattice structures, finding cell size significantly impacts mechanical properties in fused filament fabrication (FFF). Gyroid structures offered the best strength-to-density, while diamond structures showed superior deformation capacity.

Keywords:
additive manufacturingcellular structuresfuse filament fabrication

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Additive Manufacturing

Background:

  • Cellular structures offer weight reduction and mechanical performance benefits.
  • Additive manufacturing enables the fabrication of complex lattice geometries.
  • Understanding parameter influence is crucial for optimizing 3D-printed components.

Purpose of the Study:

  • Investigate the compressive behavior of gyroid, diamond, and octet truss polymer lattice structures.
  • Evaluate the impact of cell size, strut/wall thickness, and layer thickness on mechanical properties.
  • Provide design insights for optimizing lattice structures in lightweight applications.

Main Methods:

  • Fused filament fabrication (FFF) used to produce 225 PLA samples.
  • Box-Behnken experimental design to assess key parameters.
  • Compression testing (ASTM D1621) combined with regression and response surface methodology.

Main Results:

  • Cell size demonstrated the most significant influence on maximum force and displacement.
  • Strut/wall thickness and layer thickness also impacted mechanical performance.
  • Gyroid structures exhibited the highest strength-to-density ratio; diamond structures showed the greatest deformation capacity.

Conclusions:

  • Cell size is a critical design parameter for FFF polymer lattice structures.
  • Geometric and printing parameters must be carefully balanced for optimal performance.
  • Findings support the tailored design of lightweight components using additive manufacturing.