Role of $${\varvec{\alpha}} \to {\varvec{\varepsilon}} \to {\varvec{\alpha}}$$ phase transformation on the spall behavior of iron at atomic scales

Ma, Ke; Dongare, Avinash M.

doi:10.1007/s10853-022-07381-8

Cited by 9 publications

(1 citation statement)

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“…A similar phenomenon occurs in the case of metal melts [26][27][28][29], although it leads to ejection of multiple drops (micro-spall [30]) rather than spallation of a solid layer. Direct MD simulation of the whole spallation process is often used [4,[30][31][32], but here we intend to develop a fracture model and, therefore, we consider the stage of uniform tension of a representative volume element (RVE). It allows fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Spall Fracture of Solid and Molten Copper: Molecular Dynamics, Mechanical Model and Strain Rate Dependence

Mayer

Pogorelko

Voronin

et al. 2022

Metals

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In this study, we formulate a mechanical model of spall fracture of copper, which describes both solid and molten states. The model is verified, and its parameters are found based on the data of molecular dynamics simulations of this process under ultrahigh strain rate of tension, leading to the formation of multiple pores within the considered volume element. A machine-learning-type Bayesian algorithm is used to identify the optimal parameters of the model. We also analyze the influence of the initial size distribution of pores or non-wettable inclusions in copper on the strain rate dependence of its spall strength and show that these initial heterogeneities explain the existing experimental data for moderate strain rates. This investigation promotes the development of atomistically-based machine learning approaches to description of the strength properties of metals and deepens the understanding of the spall fracture process.

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