On the molecular dynamics simulation of fatigue behavior of pre-cracked aluminum chip for NEMS application: Effect of cyclic loading mode and surface roughness geometry
Source abstract
Abstract
Abstract This study focuses on investigating the dependency of fatigue nanomechanisms to the cyclic loading mode and notch shape in single-crystal aluminum nanoplates by molecular dynamics simulation. Fatigue damage in tension–tension mode is extensively dominated by nanovoids formation and persistent slip bands. Surprisingly, the tension–compression mode leads to nanovoids formation with twofold behavior, de-voiding process and substructure development preventing crack propagation stemming from the reversal strain path. It is proved that crack propagation rate is not sensitive to the notch shape in tension–tension mode. Conversely, sharp notch results in longer fatigue life than blunt notch in tension–compression mode.
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Research context
OpenAlex topics: Microstructure and mechanical properties · Nanowire Synthesis and Applications · Aluminum Alloys Composites Properties
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