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A Simplified SSY Estimate Method to Determine EPFM Constraint Parameter for Sensor Design.

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A new T-stress-based method estimates the constraint parameter A for elastic-plastic fracture mechanics (EPFM) in biaxial loading. This enhances structural analysis accuracy for sensors and engineering applications.

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Area of Science:

  • Engineering Mechanics
  • Materials Science
  • Fracture Mechanics

Background:

  • Accurate structural analysis, especially for sensors, benefits from two-parameter elastic-plastic fracture mechanics (EPFM).
  • The J-A two-parameter approach requires the constraint parameter A, which is challenging to obtain.
  • Existing T-stress-based methods for parameter A are limited to uniaxial loading.

Purpose of the Study:

  • To extend a simplified T-stress-based estimate method for obtaining the constraint parameter A to biaxial loading conditions.
  • To validate the extended method's accuracy against finite element analysis (FEA) results for various materials and geometries.

Main Methods:

  • Developed a simplified T-stress-based estimate method for the constraint parameter A.
  • Extended the method to handle biaxial external loading conditions.
  • Validated the extended method by comparing estimated A values with FEA results for SECP, CCP, and DECP specimens.

Main Results:

  • The extended T-stress-based estimate method accurately predicts the constraint parameter A under biaxial loading.
  • The method demonstrated effectiveness across diverse materials and geometrical configurations.
  • FEA validation confirmed the reliability of the simplified formation for biaxial conditions.

Conclusions:

  • The extended T-stress-based estimate method provides a convenient and effective way to obtain the constraint parameter A for biaxial loading.
  • This advancement improves the accuracy of EPFM analysis for sensors and other engineering structures under complex loading.
  • The validated method offers a practical tool for engineers in structural integrity assessments.