Open AccessMicroscopic simulation on the dynamic failure of metal Al under triangular wave loading
Author(s) -
Jian-Li Shao,
Pei Wang,
He An-Min,
Qin Cheng-Sen,
Jianting Xin,
Gu Yuqiu
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.076201
Subject(s) - virial theorem , materials science , ultimate tensile strength , molecular dynamics , microstructure , stress (linguistics) , atom (system on chip) , composite material , metal , symmetry (geometry) , morphology (biology) , mechanics , thermodynamics , physics , metallurgy , linguistics , philosophy , geometry , mathematics , quantum mechanics , galaxy , biology , computer science , genetics , embedded system
Employing an embedded-atom-method potential and molecular dynamics simulations, we have simulated the microscopic process and dynamical properties of the dynamic failure of metal Al specimens under triangular wave loading. The microstructure evolution of the sample is analyzed using the central symmetry parameter, while the difference of morphology between non molten and molten states is also explained. The pressure profiles were calculated based on the virial theorem, and the results show that the tensile strength of the material is decreased considerably in its molten state. Using the simulation results for different impact velocities, we discuss the variation of morphology and density distribution, from which the change of damage depth in the process from non molten to molten states is obtained. Our simulations also suggest that: the tensile strength of material derived from acoustic approximation is distinctively higher than the peak of internal stress from virial theorem for the melted state.