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Fluid-particle-structure interaction in single shot peening.

Yusuke Mizuno1, Takashi Misaka2, Yoshiyuki Furukawa2

  • 1Industrial Cyber-Physical Systems Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 2-3-26 Aomi, Koto-Ku, Tokyo, 135-0064, Japan. y.mizuno@aist.go.jp.

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This study reveals how fluid dynamics influence shot peening. Increased relative Reynolds numbers create complex flow fields, leading to random shot behavior and asymmetric material indentations.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Mechanical Engineering

Background:

  • Shot peening is a critical cold-working process used to enhance material properties.
  • Understanding the complex interplay between fluid flow and particle impact is crucial for optimizing shot peening.
  • Previous analyses often simplified the fluid-particle-structure interactions.

Purpose of the Study:

  • To analyze the physical phenomena of shot peening using a novel fluid-particle-structure coupled solver.
  • To investigate the influence of flow fields and shot peening parameters (impact velocity, shot size) on particle behavior.
  • To dynamically analyze the elastoplastic response of AISI4340 steel during shot impact.

Main Methods:

  • Development and application of a weakly coupled solver utilizing the immersed boundary method.
  • Dynamic analysis of AISI4340 using the finite element method during rigid steel shot collision.
  • Characterization of post-collision flow fields using the relative Reynolds number.

Main Results:

  • The relative Reynolds number effectively characterizes the post-collision flow field between shot and structure.
  • Higher relative Reynolds numbers generate complex flow fields and vortex structures at the impact site.
  • These fluid structures induce random shot trajectories and asymmetric indentations in the material.

Conclusions:

  • Fluid dynamics significantly impact shot peening outcomes, affecting particle behavior and surface integrity.
  • The developed coupled solver provides a robust framework for analyzing these complex interactions.
  • Optimizing shot peening processes requires careful consideration of fluid flow characteristics and their relation to material response.