| |
| """Render composite stress-strain plots for the D638 and D790 configs. |
| |
| Reads every specimen JSONL under data/{standard}/*.jsonl and splits it into |
| two figures per standard: the main composite (SLS batches + FormLabs PA12GF |
| benchtop control) at assets/{standard}_composite.png, and — only if the |
| standard has any — a separate figure for the PLA/PETG filament controls at |
| assets/{standard}_controls.png. PLA/PETG print at much higher stress/strain |
| than the SLS specimens, which squashed the SLS curves near the origin when |
| they shared an axis with the main composite. |
| """ |
| from pathlib import Path |
|
|
| import matplotlib.pyplot as plt |
| from matplotlib.lines import Line2D |
|
|
| from _lib import OUT_DIR, ROOT, FILAMENT_CONTROLS, load_standard, style_for |
|
|
|
|
| def legend_handles(rows: list[dict]) -> list[Line2D]: |
| """One legend entry per unique (batch, material) combination.""" |
| seen = {} |
| for row in rows: |
| key = (row["batch_label"], row["material_class"]) |
| if key in seen: |
| continue |
| color, linestyle = style_for(row) |
| if row["batch_label"]: |
| label = f"Batch {row['batch_label']}" |
| if row["material_class"] != "SLS": |
| label += f" ({row['material_class']})" |
| else: |
| label = row["material_class"] |
| seen[key] = Line2D([0], [0], color=color, linestyle=linestyle, |
| linewidth=1.6, label=label) |
| |
| sort_key = lambda kv: (kv[0][1] != "SLS", kv[0][0] or "ZZ", kv[0][1]) |
| return [h for _, h in sorted(seen.items(), key=sort_key)] |
|
|
|
|
| def render(standard: str, specs: list[dict], title: str, out_name: str) -> Path | None: |
| if not specs: |
| return None |
|
|
| fig, ax = plt.subplots(figsize=(9, 6)) |
| for s in specs: |
| color, linestyle = style_for(s["row"]) |
| ax.plot(s["strain"], s["stress_mpa"], |
| color=color, linestyle=linestyle, linewidth=1.2, alpha=0.75) |
|
|
| ax.set_xlabel("Strain (mm/mm)") |
| ax.set_ylabel("Stress (MPa)") |
| ax.set_title(f"{title} ({len(specs)} specimens)") |
| ax.grid(True, alpha=0.3) |
| ax.set_xlim(left=0) |
| ax.set_ylim(bottom=0) |
|
|
| ax.legend(handles=legend_handles([s["row"] for s in specs]), |
| loc="upper left", bbox_to_anchor=(1.02, 1.0), borderaxespad=0, |
| fontsize=9, framealpha=0.9) |
|
|
| OUT_DIR.mkdir(parents=True, exist_ok=True) |
| out_path = OUT_DIR / f"{standard}_{out_name}.png" |
| fig.savefig(out_path, dpi=150, bbox_inches="tight") |
| plt.close(fig) |
| print(f"wrote {out_path.relative_to(ROOT)} ({len(specs)} curves)") |
| return out_path |
|
|
|
|
| def plot_standard(standard: str) -> None: |
| specs = load_standard(standard) |
| if not specs: |
| raise RuntimeError(f"No specimens found in data/{standard}/") |
|
|
| main_specs = [s for s in specs if s["row"]["material_class"] not in FILAMENT_CONTROLS] |
| control_specs = [s for s in specs if s["row"]["material_class"] in FILAMENT_CONTROLS] |
|
|
| title_map = {"D638": "ASTM D638 — tensile composite", |
| "D790": "ASTM D790 — three-point flex composite"} |
| render(standard, main_specs, title_map.get(standard, standard), "composite") |
|
|
| controls_title_map = {"D638": "ASTM D638 — PLA/PETG filament controls", |
| "D790": "ASTM D790 — PLA/PETG filament controls"} |
| render(standard, control_specs, controls_title_map.get(standard, standard), "controls") |
|
|
|
|
| if __name__ == "__main__": |
| plot_standard("D638") |
| plot_standard("D790") |
|
|
