Small-Scale Mechanical Testing

Abstract

This article reviews recent developments in small-scale mechanical property testing with some emphasis on intermediate (meso) length scales in complex microstructures and coated systems. The introduction summarizes size effects discovered from a century ago up to the recent explosion in micropillar testing that established many length scale effects in yielding and fracture. The bulk of the article deals with plasticity and fracture in polyphasic and microstructurally graded systems, including biomaterials, composites, and thermal protection systems, highlighting the use of in situ methods where mechanical tests are coupled to synchrotron X-ray scattering, electron backscattering, radiation damage, and digital image correlation. Expected final online publication date for the Annual Review of Materials Research, Volume 52 is July 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

Multiscale Finite Element Analysis of Yield-point Phenomenon in Ferrite–Pearlite Duplex Steels

“…Consequently, to model the ferrite-pearlite composite structure accurately, it is imperative to assess local mechanical properties through microscopic material tests [17][18][19] . For example, a method for evaluating local mechanical properties by coupling microindentation tests with numerical simulations have been proposed 20,21) .…”

Multiscale Finite Element Analysis of Yield-point Phenomenon in Ferrite–Pearlite Duplex Steels

“…Table 2 に Fig. 6 (17,18,19) による局所力学特性の評価が必要である。例えば，微小押し込み試験と数値シミュレー ションを連携して局所力学特性を評価する手法 (20,21) が提案されており，応力降下を伴う 応力-ひずみ関係へ拡張することで，上記の課題を解決できると期待される。…”