forked from bai/curriculum-project-hub
sjfhsjfh
c73a2c903f
Real-content fixture for the end-to-end pipeline. TH-141 (39 parts: 22 segment, 15 lemma, 2 example) migrated from the prototype's typst `#let parts` manifest to ADR-0008: declarative manifest.toml (project+info+ordered parts+targets) + per-element element.toml (kind + scalars; examples carry `source`). Content .typ files copied byte-identical (no math corruption); per-element main.typ + meta.toml dropped (wiring is now generated). Part order matches source exactly; 5 lemmas have no proof.typ (optional); no cross-file imports / paralearn refs / figs. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
10 lines
429 B
Typst
10 lines
429 B
Typst
设固体体积 $V$、表面积 $A$，应变 $epsilon$ 为均匀小量。体相单位体积的自由能 $f_b = Y epsilon^2 \/ 2$，表面单位面积的自由能 $gamma(epsilon)$，总自由能
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$ F = V f_b + A gamma(epsilon) . $
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对均匀拉伸 $V epsilon$ 求导得单位横截面承担的应力
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$ sigma_("tot") = (partial F) / (partial (V epsilon)) = Y epsilon + A / V dot (dif gamma) / (dif epsilon) , $
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即 @总应力。
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