Microscopic spallation mechanisms induced by a pulse laser at the solid-state interface

in Sciences Citation Index(SCI), 科學引文索引資料庫(SCI)
標題Microscopic spallation mechanisms induced by a pulse laser at the solid-state interface
出版類型SCI(Sciences Citation Index)
AuthorsLAI, 賴新一, Pei-Hsing Huang 黃培興, Pei-Hsing Huang 黃培興, & Fang T.H. 方得華
出版日期2007 / 3

This paper presents a study of the transient behavior
of structural dynamics and the associated innovatory microscopic
spallation mechanism at the solid-state interface, induced
by an incident femtosecond pulse laser. By detailed structural
dynamic analysis, using the technique of molecular dynamics
simulation, the spallation mechanismat the solid–solid interface
is observed. The occurrence of structural spallation is mainly
characterized by extraordinary expansion dynamics and tensile
stress that induces interior structural void defect coalescence,
eventually leading to cracking. Themicroscopic phenomenon of
moderate ductile fracturing at the solid–solid interface is identified.
A high strain rate in the order of 109 s?1 is observed. Both
aforementioned phenomena are analogous to the experimental
results of metal-film spallation excited by a pulse laser. Moreover,
it is also shown that the critical value of the stain rate is
one of the dominant factors that influences the occurrence and
mechanism of structural spallation. The results of simulations
reveal that the thin-film structure is safe if the strain rate is below
certain critical values. The critical damage threshold is evaluated
and technical suggestions to avoid interfacial fracture are
also presented.

期刊名稱Applied Physics A - Materials Science & Processing
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