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Related Concept Videos

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

Unsymmetric Loading of Thin-Walled Members: Problem Solving

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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.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
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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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Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

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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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Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
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Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

212
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...
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Design of Transmission Shafts01:16

Design of Transmission Shafts

374
The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by...
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Related Experiment Video

Updated: Jul 19, 2025

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes
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Improved Optimization of a Coextrusion Die with a Complex Geometry Using the Coupling Inverse Design Method.

Xinyu Hao1, Guangdong Zhang1, Tong Deng2

  • 1School of Mechanical Engineering, Yancheng Institute of Technology, Yancheng 224051, China.

Polymers
|August 12, 2023
PubMed
Summary

A novel coupled optimization and inverse design method significantly improves polymer coextrusion die design for medical striped catheters. This approach reduced geometric errors by 72.3%, enhancing design efficiency.

Keywords:
barium sulfatecoextrusioncoupling methodinverse designoptimization designthermoplastic polyurethane

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Area of Science:

  • Polymer Science and Engineering
  • Materials Science
  • Manufacturing Processes

Background:

  • Coextrusion die design is critical for minimizing geometric errors like extrusion swell and interface motion.
  • Complex geometries in products such as medical striped catheters pose significant design challenges.
  • Existing methods often struggle to optimize intricate die designs efficiently.

Purpose of the Study:

  • To develop and evaluate a coupled optimization and inverse design method for coextrusion dies.
  • To specifically address the design of dies for medical striped catheters.
  • To enhance the geometric accuracy and design efficiency of the coextrusion process.

Main Methods:

  • Utilized thermoplastic polyurethane (TPU) as the main material and barium sulfate-filled TPU as the auxiliary material.
  • Implemented an overall optimization design method for the complex die channel geometry.
  • Employed a local inverse design method for the auxiliary material inlet.
  • Applied the non-linear programming by quadratic Lagrangian (NLPQL) algorithm for geometric optimization.

Main Results:

  • The coupled method demonstrated a remarkable improvement in coextrusion die design efficiency.
  • Geometric errors, measured by the objective function, were reduced by 72.3% compared to the initial design.
  • Experimental verification confirmed the effectiveness of the proposed design approach.

Conclusions:

  • The coupling of optimization and inverse design offers a powerful strategy for coextrusion die development.
  • This method effectively minimizes geometric errors in complex polymer coextrusion products.
  • The study highlights a significant advancement in the design of specialized coextrusion dies for medical applications.