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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

227
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
227
Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

330
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
330
Bending of Curved Members - Strain Analysis01:14

Bending of Curved Members - Strain Analysis

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The mechanics of deformation in curved members, such as beams or arches, under bending moments, involve complex responses. When such a member, symmetric about the y-axis and shaped like a segment of a circle centered at point C, is subjected to equal and opposite forces, its curvature and surface lengths change significantly. This alteration results in the shift of the curvature's center from C to C', indicating a tighter curve.
The important part of bending analysis for such a member...
294
Residual Stresses in Bending01:18

Residual Stresses in Bending

322
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
322
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

201
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
201
Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

177
When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
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Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
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Model-Based Estimation of the Strength of Laser-Based Plastic-Metal Joints Using Finite Element Microstructure Models

Julius Moritz Berges1, Kira van der Straeten2, Georg Jacobs1

  • 1Institute for Machine Elements and Systems Engineering, RWTH Aachen University, Eilfschornsteinstr. 18, 52062 Aachen, Germany.

Materials (Basel, Switzerland)
|September 10, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a new simulation method for laser-based plastic-metal joints, enabling efficient strength prediction. A validated surrogate model accurately estimates joint strength, facilitating mechanical design for lightweight applications.

Keywords:
hybrid jointslaser manufacturingmechanical designmicrostructure modelmodel-based engineeringproduct developmentsimulationsurrogate modelling

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Area of Science:

  • Materials Science and Engineering
  • Manufacturing Processes
  • Computational Mechanics

Background:

  • Laser-based joining of plastics and metals offers cost and weight reduction potential.
  • Current limitations in mechanical design stem from a lack of simulation methods for these joints.
  • This research addresses the need for predictive models in laser-based plastic-metal joining.

Purpose of the Study:

  • To develop a model-based approach for estimating the strength of laser-based plastic-metal joints.
  • To create efficient surrogate models that capture microstructure parameter effects on joint strength.
  • To provide designers with a tool for mechanical design and parameter sensitivity analysis.

Main Methods:

  • Developed a parametrization rule for microstructure shape using microsection analysis.
  • Created a parameterized finite element (FE) model of the micro-level joining zone.
  • Employed statistical plans and model fits, including surrogate modeling with half-factorial design and linear regression.

Main Results:

  • The FE model predicted joint strength with a 3.7% error compared to experimental data.
  • Surrogate modeling achieved high accuracy (6.2% error) using only 16 samples.
  • The developed surrogate model provides an equation for convenient parameter sensitivity estimation.

Conclusions:

  • The model-based approach enables efficient strength estimation for laser-based plastic-metal joints.
  • Surrogate models offer a practical and accurate tool for mechanical design in this domain.
  • This methodology facilitates the wider application of lightweight plastic-metal joints.