Micromechanical simulation of cyclic plasticity at inclusion particles with pre-over-straining

Yibin Xue, Amada M. Wright, Kiran Solanki, Mark F. Horstemeyer, David L. McDowell

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Understanding and quantifying correctly the effects of overload on the cyclic damage accumulation at a microscale discontinuity is essential for the development of a multstage fatigue model under variable loading. Micromechanical simulations were conducted on a 7075-T651 Al alloy to quantify the cyclic microplasticity induced by constant amplitude cyclic loads following a pre-overload. The initial overstraining amplitudes were selected in the region of limited macroscopic plastic deformation to account for both macroscopic and microscopic plastic overloading effects. The nonlocal equivalent plastic strain at the micrometer-scale discontinuity showed the overload effects primarily in two forms: 1) the cyclic plastic dissipation is greater in the cycles following a pre-overstraining than that without a pre-overstraining; 2) the overtraining causes the nonlocal equivalent plastic strain to increase two times in a tensile loading step and three times in the compression loading steps, as compared to those without a pre-overstraining. The cyclic plastic zone at the microdiscontinuity corresponds to the maximum load in overstraining. The micromechanical simulation results support a cyclic damage accumulation rule that captures the cyclic microplasticity accumulation induced by an overstraining for a high fidelity fatigue incubation model under variable amplitude loading.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
Pages7703-7713
Number of pages11
StatePublished - Aug 6 2007
Externally publishedYes
Event48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference - Waikiki, HI, United States
Duration: Apr 23 2007Apr 26 2007

Publication series

NameCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Volume8
ISSN (Print)0273-4508

Other

Other48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
CountryUnited States
CityWaikiki, HI
Period4/23/074/26/07

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ASJC Scopus subject areas

  • Architecture
  • Materials Science(all)
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Xue, Y., Wright, A. M., Solanki, K., Horstemeyer, M. F., & McDowell, D. L. (2007). Micromechanical simulation of cyclic plasticity at inclusion particles with pre-over-straining. In Collection of Technical Papers - 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference (pp. 7703-7713). (Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference; Vol. 8).