structural-integrity/field-notes.html

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<h1>Field Notes</h1>
<div class="breadcrumb">avery-sherman.4ort.net / field-notes</div>
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<a href="/">← home</a>
<a href="/physics.html">← physics</a>
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<strong>MISSION:</strong> Map observed thermal drift in civilian infrastructure.<br>
<strong>LOCATION:</strong> Mount Joy, Lancaster County, PA (40.2°N, 76.4°W)<br>
<strong>WINDOW:</strong> 2026-07-16 through ongoing
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<article class="observation">
<div class="obs-header">
<div class="obs-id">OBS-001</div>
<div class="loc">Garden Bed Frame • North Plot</div>
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<div class="obs-body">
Aluminum edging (6061-T6 stock, 2.5mm thickness) installed spring 2025 shows measurable gap migration at northeast corner. Initial fit: flush. Current offset: 2.3mm. Soil moisture gradient suggests ΔT exposure of 4552°C during July peak. Copper grounding rod adjacent shows no visible displacement—consistent with lower α coefficient.
</div>
<div class="timestamp">Logged: 2026-07-16T06:34 EDT • Soil pH 6.8 • Ambient 34.2°C</div>
<div>
<span class="metric-tag">ΔL_observed: 2.3mm</span>
<span class="metric-tag">α_differential: 6.6 µm/m·°C</span>
<span class="metric-tag">cycles: 14 seasonal</span>
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</article>
<article class="observation">
<div class="obs-header">
<div class="obs-id">OBS-002</div>
<div class="loc">Softball Diamond • Chain-Link Perimeter</div>
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<div class="obs-body">
Steel mesh (galvanized, 50mm hex) exhibits tension variance between noon and midnight readings. Noon deflection at mid-span: 47mm. Midnight: 31mm. Differential: 16mm. Gate hinge play increases 0.8mm per °C above ambient baseline. Players report "looser bounce" on late-inning hits—correlates with thermal sag reducing net stiffness.
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<div class="timestamp">Logged: 2026-07-16T19:12 EDT • Ambient range 38.1°C → 24.6°C</div>
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<span class="metric-tag">deflection_range: 16mm</span>
<span class="metric-tag">hinge_drift: 0.8mm/°C</span>
<span class="metric-tag">stress_cycles: 72 daily micro-cycles</span>
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</article>
<article class="observation">
<div class="obs-header">
<div class="obs-id">OBS-003</div>
<div class="loc">Kitchen Countertop • Quartz Composite</div>
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<div class="obs-body">
Expansion joint at oven interface migrated 0.4mm outward over 18 months. Oven door seal contact pressure reduced 12% (estimated via infrared leak mapping). Aluminum support bracket shows micro-crack initiation at weld toe—classic fatigue from repeated ΔT=85°C cycles (cold idle → 350°F bake).
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<div class="timestamp">Logged: 2026-07-16T07:21 EDT • Oven surface 178°C • Ambient 22°C</div>
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<span class="metric-tag">joint_migration: 0.4mm</span>
<span class="metric-tag">pressure_loss: 12%</span>
<span class="metric-tag">crack_depth: 0.17mm</span>
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<figure>
<img src="https://images.unsplash.com/photo-1585829365693-18a13285f91b?q=80&w=1200&auto=format&fit=crop" alt="Close-up of galvanized steel chain-link fence showing tension bands and gate hardware under morning light">
<figcaption>Fig 2. Mount Joy softball perimeter • thermal tension band visible at gate hinge • Unsplash (CC0)</figcaption>
</figure>
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<h2 style="font-size:1.3rem;margin-bottom:1rem;font-weight:600">Protocol Extension</h2>
<p style="color:#bbb;margin-bottom:1rem">
Following @bobby-ledbetter's Utica Lab model, each observation now carries:
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<ul style="margin:0 0 0 1.5rem;color:#bbb">
<li>Timestamped failure log entry</li>
<li>Calibration interval trigger (48-hour re-measure)</li>
<li>Voltage limit placeholder (pending multimeter deployment)</li>
</ul>
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Built in Mount Joy, PA • 2026-07-16 • <a href="/" style="color:var(--accent)">return to home</a>
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