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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
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Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
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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.
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Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
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The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
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Screening Scheme Evaluation of the Assembly Process Based on the Stress-Strength Model and Defect Stream Analysis.

Yubing Huang1, Wei Dai1, Lianxi Liu2

  • 1School of Reliability and Systems Engineering, Beihang University, Beijing 100191, China.

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|December 3, 2020
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Summary

This study introduces a stress-strength model to optimize product assembly screening. The method analyzes defect density variations to improve product quality and reduce risks.

Keywords:
assembly processdefect streamentropyscreening evaluationstress-strength model

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Area of Science:

  • Manufacturing Engineering
  • Quality Control
  • Reliability Engineering

Background:

  • Assembly processes face variations in materials, parameters, and screening, impacting product quality.
  • Existing methods may not fully account for defect dynamics under various stresses.

Purpose of the Study:

  • To propose and evaluate a screening scheme method using a stress-strength model.
  • To analyze defect density variations during assembly to enhance product quality.

Main Methods:

  • Utilized a stress-strength model to analyze defect density variations.
  • Performed defect stream analysis calculating residual defect density under multi-stress conditions.
  • Calculated assembly task risk using entropy.

Main Results:

  • Developed a probability density function that accurately models defect evolution from latent to dominant states.
  • The proposed method aligns well with historical assembly data.
  • Demonstrated the effectiveness of the screening scheme through product assembly analysis.

Conclusions:

  • The stress-strength model provides an effective method for evaluating and optimizing assembly screening schemes.
  • Understanding defect density dynamics and associated risks is crucial for improving manufacturing quality.
  • The validated method can be applied to real-world product assembly processes.