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Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

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The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
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Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
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Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
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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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Updated: Mar 29, 2026

Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
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A G-Code-Driven Modeling and Thermo-Mechanical Coupling Analysis Method for the FDM Process of Complex Lightweight

Dinghe Li1, Yiheng Dun1, Zhuoran Yang1

  • 1Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China.

Materials (Basel, Switzerland)
|March 28, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a G-code-driven workflow for simulating Fused Deposition Modeling (FDM), accurately predicting thermo-mechanical behavior and warpage in complex 3D printed parts with varying infill strategies.

Keywords:
FDMG-code-driven modelingelement birth–death methodresidual stressthermo-mechanical couplingtransient thermal analysiswarpage deformation

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Area of Science:

  • Additive Manufacturing
  • Computational Mechanics
  • Materials Science

Background:

  • Fused Deposition Modeling (FDM) simulations are challenged by discrepancies between Computer-Aided Design (CAD) geometry and actual material deposition.
  • Path-dependent material deposition significantly influences thermo-mechanical behavior and final part quality.

Purpose of the Study:

  • To develop a G-code-driven, filament-level simulation workflow for FDM.
  • To accurately predict thermo-mechanical behavior, including warpage and residual stresses, for complex geometries and infill strategies.
  • To investigate the impact of infill topology and boundary conditions on simulation outcomes.

Main Methods:

  • Parsing G-code to reconstruct individual filament paths as rectangular beads.
  • Utilizing an element birth-death method with centroid-based selection in ANSYS Parametric Design Language (APDL) for progressive deposition simulation.
  • Implementing indirect thermo-mechanical coupling for nonlinear transient thermal and structural analysis.

Main Results:

  • The simulation accurately captures high-temperature zones following deposition paths (peak ~220 °C).
  • Accumulated displacement and von Mises stress are significantly influenced by infill topology and boundary conditions.
  • The workflow demonstrates robustness for complex meshes and varying infill patterns.

Conclusions:

  • The developed G-code-driven workflow enhances the accuracy of thermo-mechanical predictions in FDM.
  • Infill strategy and boundary conditions are critical factors affecting residual stresses and warpage in 3D printed parts.
  • This method provides a valuable tool for optimizing FDM process parameters and part design.