Engineering Design

Safety Factors & Load Cases: Structural Integrity Framework

In high-stakes engineering, "strong enough" is a mathematical certainty, not a guess. Edelweis establishes a rigorous Safety Factors & Load Cases protocol to ensure every component is engineered to survive its intended use and "edge-case" extremes. We translate environmental data into a structured Load Matrix that drives our validation process.

1. The Load Case Matrix

We analyze products across their entire lifecycle by defining specific Load Cases—discrete scenarios where the system is subjected to different force combinations:

Static Loads

Constant forces such as gravity (Dead Load), internal pressure, and fixed mechanical tension.

Dynamic & Impact

Sudden forces including drop tests, collisions, or rapid G-force acceleration/deceleration.

Thermal-Mechanical

Forces generated by material expansion and contraction in extreme temperature gradients.

2. Factor of Safety (FoS) Determination

Industry / Application	Target FoS Range	Rationale
Aerospace (Flight Hardware)	1.1 — 1.5	High-predictability loads; extreme weight sensitivity.
General Industrial Machinery	2.0 — 3.0	Accounting for wear, maintenance gaps, and variable usage.
Lifting & Rigging	5.0 — 8.0	Zero-tolerance for failure; high risk to human life.
Pressure Vessels (ASME)	3.5 — 4.0	Standardized regulatory compliance for high-energy containment.

3. Boundary Condition Logic

The accuracy of a simulation depends on how the model is "held" in virtual space. We employ advanced BC protocols:

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Fixed & Pinned Supports: Mimicking rigid bolted connections or hinged pivots.
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Elastic Support: Simulating real-world "give" in gaskets, rubber mounts, or foundations.
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Symmetry BCs: Reducing computational overhead by simulating symmetrical assembly sections without losing physics accuracy.
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Bolt Preload: Accounting for initial internal stress created by tightened fasteners before external loads are applied.

4. Stress Limit Criteria

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Ductile Materials (Von Mises): We use Distortion Energy Theory to predict the onset of yielding in metals like Steel and Aluminum.
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Brittle Materials (Mohr-Coulomb): Specialized solvers for cast iron, ceramics, or composites that fail via fracture.
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Fatigue Life Prediction: Calculating "Damage Accumulation" to ensure target service life (e.g., 10 years or 1M actuations).

Technical Directives

Directive	Protocol
Worst-Case Combination	Analysis must include "Simultaneous Peak"—e.g., max payload occurring during max thermal expansion.
Margin of Safety (MoS)	Reports must specify MoS; any value below 0 triggers a mandatory design reject.
Singularity Audit	Manual review of Stress Concentrations to distinguish between mathematical artifacts and physical risks.

Next Step: See how these loads are processed in FEA (Finite Element Analysis).