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+# Study Report — 01_v1_tpe: Isogrid Mass Minimization
+
+**Study:** isogrid_01_v1_tpe
+**Project:** Isogrid Dev Plate (ACS Stack Main Plate)
+**Algorithm:** Optuna TPE, seed=42
+**Budget:** 200 trials
+**Date started:** [TBD]
+**Date completed:** [TBD]
+**Author:** Antoine + Atomizer
+
+---
+
+## Executive Summary
+
+| Metric | Value |
+|--------|-------|
+| Status | [TBD — Not started / Running / Complete] |
+| Trials completed | [TBD] / 200 |
+| Best mass | [TBD] kg |
+| Best trial # | [TBD] |
+| Convergence trial | [TBD] (when best was first found) |
+| Best σ_max | [TBD] MPa |
+| Best SF | [TBD] (target ≥ 5.0) |
+| Feasibility rate | [TBD] % |
+| Total runtime | [TBD] h |
+| Avg time/trial | [TBD] s |
+
+---
+
+## Best Design Found
+
+### Parameters
+
+| Variable | Value | Range |
+|----------|-------|-------|
+| `eta_0` | [TBD] | [0.0, 0.4] |
+| `alpha` | [TBD] | [0.3, 2.0] |
+| `beta` | [TBD] | [0.0, 1.0] |
+| `gamma_stress` | [TBD] | [0.0, 1.5] |
+| `R_0` | [TBD] mm | [10, 100] |
+| `R_edge` | [TBD] mm | [5, 40] |
+| `s_min` | [TBD] mm | [8, 20] |
+| `s_max` | [TBD] mm | [25, 60] |
+
+### Results
+
+| Metric | Value |
+|--------|-------|
+| Mass | [TBD] kg ([TBD] g) |
+| Max von Mises | [TBD] MPa |
+| Safety factor | [TBD] |
+| Feasible | [TBD] |
+| Total pockets | [TBD] (sandbox_1 + sandbox_2) |
+
+### Trial folder
+
+```
+2_iterations/trial_[TBD]/
+├── params.json
+├── results.json
+├── rib_profile_sandbox_1.json
+└── rib_profile_sandbox_2.json
+```
+
+---
+
+## Optimization Progress
+
+### Trial Statistics
+
+| Metric | Value |
+|--------|-------|
+| Total trials | [TBD] |
+| Feasible trials | [TBD] ([TBD] %) |
+| Failed trials (error) | [TBD] |
+| Min objective | [TBD] |
+| Median objective | [TBD] |
+| Max objective | [TBD] |
+
+### Best History (top 10 improvements)
+
+| Trial # | Mass (kg) | σ_max (MPa) | SF | Feasible |
+|---------|-----------|-------------|-----|----------|
+| [TBD] | [TBD] | [TBD] | [TBD] | [TBD] |
+| ... | ... | ... | ... | ... |
+
+---
+
+## Comparison vs Baseline
+
+| Metric | Baseline (solid) | Best isogrid | Reduction |
+|--------|-----------------|--------------|-----------|
+| Mass | [TBD] kg | [TBD] kg | [TBD] % |
+| Max σ | [TBD] MPa | [TBD] MPa | — |
+| SF | [TBD] | [TBD] | — |
+
+> Baseline solid plate mass: TBD (Gap G-02 — run `extract_part_mass_material` on unmodified model).
+
+---
+
+## Runtime Performance
+
+| Metric | Value |
+|--------|-------|
+| Total wall time | [TBD] h |
+| Average per trial | [TBD] s |
+| Brain (avg) | [TBD] s |
+| NX import (avg) | [TBD] s |
+| NX solve (avg) | [TBD] s |
+| Extraction (avg) | [TBD] s |
+| Fastest trial | [TBD] s |
+| Slowest trial | [TBD] s |
+
+---
+
+## Failure Analysis
+
+| Failure type | Count | Notes |
+|-------------|-------|-------|
+| Brain error | [TBD] | [TBD] |
+| NX import failed | [TBD] | [TBD] |
+| NX solve failed | [TBD] | [TBD] |
+| OP2 missing | [TBD] | [TBD] |
+| Extractor error | [TBD] | [TBD] |
+
+---
+
+## Recommendations
+
+> Fill in after campaign completes.
+
+- [ ] If feasibility rate < 80%: increase `s_min` lower bound (too many dense patterns stress-out)
+- [ ] If convergence flat after trial 100: consider Campaign 02 with tighter bounds around best region
+- [ ] If `gamma_stress` best value > 0.5: stress feedback is helping — keep it in next campaign
+- [ ] If best SF >> 5.0: more aggressive lightweighting possible — widen s_max bound
+
+---
+
+## Configuration Reference
+
+**Study name:** `isogrid_01_v1_tpe`
+**Constraint:** σ_max ≤ 100.6 MPa (stress only)
+**Material:** AL7075-T6, σ_yield = 503 MPa, SF = 5
+**DB:** `3_results/study.db`
+**Run script:** `run_optimization.py`
+**NX version:** DesigncenterNX2512
+**NX model:** `1_setup/model/ACS_Stack_Main_Plate_Iso_project_sim2.sim`