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Related Concept Videos

Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Deformation in a Circular Shaft01:10

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

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When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
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Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

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When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
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Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

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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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Minimizing Deformations during HP MJF 3D Printing.

Karel Ráž1, Zdeněk Chval1, Sacha Thomann2

  • 1Faculty of Mechanical Engineering, Regional Technological Institute, University of West Bohemia, Univerzitni 8, 306 14 Plzen, Czech Republic.

Materials (Basel, Switzerland)
|December 9, 2023
PubMed
Summary
This summary is machine-generated.

Investigating Hewlett-Packard Multi Jet Fusion (HP MJF) 3D printing, this study found part position significantly impacts deformation. Simulations show potential for predicting and minimizing these critical distortions in nylon plastic parts.

Keywords:
3D printingDigimatMJFPA12GBadditive manufacturingdeformation

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Area of Science:

  • Materials Science
  • Manufacturing Engineering
  • Computational Engineering

Background:

  • Additive Manufacturing (AM), specifically Hewlett-Packard Multi Jet Fusion (HP MJF), is a rapidly advancing technology with broad applications.
  • Deformation in 3D-printed parts is a significant challenge, impacting final product properties and necessitating mitigation strategies.

Purpose of the Study:

  • To investigate and understand deformation mechanisms during the HP MJF 3D printing process.
  • To explore methods for minimizing part deformation and improving the quality of 3D-printed components.

Main Methods:

  • Parts made from glass bead-infused nylon plastic (PA12GB) were printed using HP MJF technology.
  • Deformations were tracked over time by measuring specimens at various points.
  • Finite element simulations using Digimat software (AM, MF, FE, CAE modules) were conducted and compared with experimental results.

Main Results:

  • Part printing position within the HP MJF printer demonstrably influences deformation levels.
  • Simulations indicated that printing multiple parts together reduced predicted deformation compared to a single part (5.7 mm vs. 7.19 mm).
  • A notable discrepancy existed between simulated (3.44 mm - 7.19 mm) and real-world deformations (3.44 mm), highlighting the complexity of deformation prediction.

Conclusions:

  • Understanding deformation mechanisms is crucial for enhancing 3D-printed part quality.
  • The study provides insights into factors affecting deformation and explores techniques for reduction.
  • Findings can guide the development of compensating technologies to minimize distortions in HP MJF parts.