Numerical Assessment of Dislocation-Punching Theories for Continuum Structural Analysis of Particle-Reinforced Metal Matrix Composites

Suh, Yeong-Sung; Kim, Yong-Bae

doi:10.3795/ksme-a.2011.35.3.273

Cited by 1 publication

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dislocation density hardening related parameters are estimated and summarized in Table 1 . Meanwhile, and are calculated according to the spherical dislocation punching model 45 (see Supplementary Table 1 and Supplementary Note 3 for details). Then, by considering parameters in Table 1 and the calculated and , the mechanical responses of the SiC/A356 composites are plotted.…”

Section: Resultsmentioning

confidence: 99%

A crystal plasticity model for metal matrix composites considering thermal mismatch stress induced dislocations and twins

Hou

Yang

Song

et al. 2021

Sci Rep

View full text Add to dashboard Cite

Originated at heterogeneous interfaces with distinct coefficient of thermal expansion (CTE), thermal mismatch stress is one of the critical influential factors to mechanical properties of metal matrix composites (MMCs). This stress is normally accommodated plastically by various defects, for example, high-density dislocations and twins in Al near heterogeneous interfaces in SiC/Al composites. Basic knowledge on the influence of defect characteristics is important but difficult to extrapolate from experimental results. However, existed theoretical models more focus on the influence of dislocation density, but less focus on defects variety, volume and distribution. In this paper, we propose a physics-based crystal plasticity model that has the capability of dealing with thermal mismatch stress induced dislocations and twins (denoted as TMDT model). The proposed TMDT model that is implemented in the Visco-Plastic Self-Consistent (VPSC) method considers defect heterogeneous distribution (gradient range), defect type (dislocations vs. twins) and defect volume fraction (twin spacing vs. twin volume). We demonstrate the validity and the capability of the VPSC-TMDT model in SiC/Al composites with thermal mismatch induced dislocations or twins. Furthermore, this model predicts the ultra-high strength of Graphene/Copper composites with high-density nanoscale twins, which is in turn the future aim for such nanocomposites.

show abstract