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α-Al₂O₃ nanoslab fracture and fatigue (Elsevier proof / author query)

Evidence and attribution

Corpus role

The file papers/Verners_CompMatSci_2015_proof.pdf is an Elsevier author-query / proof workflow PDF. Local normalized/extracts text for this slug is not a clean article body. All scientific summary below is aligned to the peer-reviewed article curated as [[2015verners-computationa-al2o3-nanoslab]] (papers/Verners_CompMatSci_2015.pdf).

Summary

This slug exists to register manifest provenance for a proof/author-query PDF tied to DOI 10.1016/j.commatsci.2015.02.048—the Computational Materials Science study on α-Al₂O₃ nanoslab fracture and fatigue using ReaxFF reactive MD and related static loading workflows. The peer-reviewed publication (see primary page) compares finite-temperature dynamic failure with incremental static pathways for single-crystalline slabs under monotonic and cyclic loading, examining strain rate, lateral pre-strain, and size effects on failure strain, crack healing versus branching, and amorphization ahead of cracks, with selected DFT context for bulk-like behavior. Low-cycle fatigue-relevant conclusions include shakedown-like elastic responses after repeated loading in some regimes. Because this corpus path is a proof artifact, automated extract snippets may contain author-query boilerplate, watermarks, or incomplete figure captions; always reconcile numerical stress–strain details and ReaxFF parameter notes against the journal PDF on the primary page before using values in downstream MAS records.

Methods

papers/Verners_CompMatSci_2015_proof.pdf is an Elsevier author-query / proof workflow file for DOI 10.1016/j.commatsci.2015.02.048. The simulation setup matches [[2015verners-computationa-al2o3-nanoslab]] (papers/Verners_CompMatSci_2015.pdf): LAMMPS ReaxFF on 3D periodic α-Al₂O₃ nanoslabs; dynamic NPT tensile segments at 300 K, 0.2 fs, 0.25% / 0.5 ps strain pulses with 5 ps relaxations, Nosé–Hoover thermostat (100 fs) and barostat (5000 fs) driving lateral 0 Pa; parallel static strain-plus-minimization branches; VASP PBE bulk checks as in the journal article. Query-sheet layout here can obscure tables—use the journal PDF for definitive parameters.

Findings

Qualitative mechanisms match [[2015verners-computationa-al2o3-nanoslab]]: dynamic loading gives lower failure strains than incremental static loading; pre-strain and volume pre-relaxation shift crack branching, healing, and elastic shakedown; amorphization ahead of cracks supports small-strain plasticity. Sensitivity to strain rate and preparation path is discussed on the primary page relative to temperature-controlled NPT segments. Limitations of this proof PDF include query-sheet layout and possible table splits; however, the science should be read from the version-of-record PDF (papers/Verners_CompMatSci_2015.pdf) rather than inferred from workflow duplicates alone. Comparisons of ReaxFF moduli and fracture metrics to DFT and experiment appear in the journal article’s tables, not in this file.

Limitations

Proof PDFs are workflow artifacts—may lack final pagination, figures, or copy-editing. Nanoscale slabs omit grain boundaries and environmental chemistry; ReaxFF validity is limited by its QM training envelope. For fatigue cycle counts and stress amplitudes, use tabulated simulation parameters from the journal PDF because the query layout may split tables across pages awkwardly.

Relevance to group

Penn State collaboration on ReaxFF for ceramic fracture and fatigue and mechanical reliability.

Citations and evidence anchors

Reader notes (navigation)