Size effect on the compressive strength of hollow micropillars governed by wall thickness

作者：Fan Haidong; Li Zhenhuan^*; Huang Minsheng

来源：Scripta Materialia, 2012, 67(3): 225-228.

DOI：10.1016/j.scriptamat.2012.04.012

• Discrete dislocation dynamics
• Hollow micropillar
• Single-arm source model
• Size effect

The compressive behavior of hollow micropillars is modeled by three-dimensional discrete dislocation dynamics (3D-DDD). Computational results show that wall thickness is the principal geometrical parameter governing the compressive strength of these micropillars, while inner or outer diameter has a weak influence. This is because the plastic behavior is dominated by the single-arm dislocation sources with statistical lengths determined by the wall thickness. The single-arm source model is further extended to quantitatively describe this thickness effect, showing good agreement with the present 3D-DDD results.

• 出版日期2012-8
• 单位华中科技大学