Thirteen disciplines · three claims each · not peer reviewed
Thirteen engineering disciplines, three claims each. The sciences got most of the earlier volumes; this one goes to the disciplines that build things, where failure is measured in structures rather than in statistics.
Beach nourishment longevity is set by the ratio of fill grain size to native sediment size rather than by fill volume, so a larger volume of fine sand can disappear faster than a smaller volume of coarse sand.
Storm surge damage to a coastal barrier is set by the ratio of surge height to dune crest height rather than by surge height alone.
Shoreline erosion accelerates where the alongshore sediment transport gradient exceeds a threshold, so a uniform coast erodes uniformly while a gradient concentrates loss.
Building damage in an earthquake is set by the ratio of the building's period to the site's period rather than by peak ground acceleration.
Liquefaction triggering is set by the ratio of cyclic stress to effective confining stress rather than by the number of cycles.
Damage from an aftershock sequence is set by the ratio of residual capacity to aftershock demand, so buildings that survive the mainshock can fail in the aftershock if their capacity was consumed.
Time to flashover is set by the ratio of heat release rate to the ventilation factor rather than by the fuel load.
Vertical fire spread in a ventilated facade is set by the ratio of cavity width to flame height, so a narrow cavity can propagate faster than a wide one.
Evacuation time is set by the ratio of occupant load to exit width rather than by travel distance, so a compact building with narrow exits can be slower to clear than an extended one with wide exits.
The timing of slope failure is set by the ratio of rainfall intensity to permeability rather than by rainfall total, so a short intense storm can trigger where a long gentle one does not.
Capacity of a rock-socketed pile is set by the ratio of socket length to diameter rather than by socket length alone.
Differential settlement is set by the ratio of consolidation time to construction time, so the same structure on the same soil behaves differently if built faster.
The smallest detectable damage is set by the ratio of the mode-shape change produced to the measurement noise, not by sensor density.
Sensor placement efficiency is set by the ratio of modal strain energy captured to the number of sensors, so placing all sensors in one region wastes the budget.
Remaining fatigue life is set by the ratio of measured stress range to design stress range raised to the fatigue exponent, so modest exceedances consume life disproportionately.
External pipeline corrosion occurs where the ratio of cathodic protection current to coating defect area falls below a threshold, so a well-protected pipe can corrode at a small defect.
Severe slugging in a multiphase pipeline begins when the ratio of gas to liquid superficial velocity crosses a threshold, not when liquid holdup alone is high.
The smallest detectable leak is set by the ratio of leak signal to flow-induced noise, not by sensor sensitivity, so a quiet sensor on a noisy line detects less.
Core damage probability is set by the ratio of decay heat to residual cooling capacity rather than by the initiating event, so small events can be severe on degraded cooling.
Containment failure is set by the ratio of pressure rise rate to vent capacity, so a containment with more venting can tolerate a larger release.
Human error probability in an accident is set by the ratio of time available to time required for the response, not by operator training alone.
Continuous welded rail buckles when the ratio of temperature rise to lateral resistance exceeds a threshold, so a cooler day can buckle a track with poor restraint.
Wheel-rail wear rate is set by the ratio of creep force to the adhesion limit, so wear accelerates sharply where the ratio approaches one.
Minimum headway is set by the ratio of braking distance to block length rather than by line speed, so a slower line with long blocks can have lower capacity.
Mooring line fatigue is set by the ratio of wave period to the line's natural period rather than by wave height, so a moderate sea near resonance can do more damage than a storm off it.
Slamming pressure on a hull is set by the ratio of impact velocity to the deadrise angle rather than by velocity alone.
Vortex-induced vibration of a riser becomes large when the ratio of shedding frequency to natural frequency approaches one, so current speed matters only through that ratio.
Reservoir storage loss is set by the ratio of sediment trap efficiency to storage volume, so a small reservoir with high trap efficiency loses its life faster than a large one.
Dam safety is set by the ratio of spillway capacity to probable maximum flood, not by the return period used in design.
Aquifer sustainability is set by the ratio of recharge to abstraction rather than by abstraction volume, so a large abstraction in a high-recharge basin is safer than a small one in a low-recharge basin.
Link reliability is set by how the total margin is distributed across fading and interference rather than by the total margin, so two links with equal budgets can differ in outage.
Whether two services can share a band is set by the ratio of the incumbent's interference tolerance to the entrant's power, not by the entrant's power alone.
Network holdover performance is set by the ratio of oscillator drift rate to the permissible time error, so a better oscillator buys holdover in proportion to the specification.
Stiffened panel buckling is set by the ratio of skin thickness to stiffener spacing rather than by skin thickness alone.
Fatigue life under variable amplitude loading is set by the ratio of spectrum severity to the design spectrum rather than by the number of cycles.
Flutter onset is set by the ratio of flutter speed to dive speed, so a design with a small margin is sensitive to small stiffness changes.
Heat loss through thermal bridges is set by the ratio of bridge area to envelope area, so a small poorly insulated detail can dominate a well-insulated envelope.
Interstitial condensation risk is set by the ratio of vapour resistance on the cold side to drying capacity, not by indoor humidity alone.
Acoustic privacy between dwellings is set by the ratio of partition mass to background noise level rather than by partition mass alone.
A field-by-field catalogue tells you what each discipline thinks. A mechanism-by-mechanism catalogue tells you what kind of argument a discipline is making, and lets you check whether the same argument holds somewhere else. Each family here is a distinct causal shape; the eleven instances test whether it generalises.
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Publication records: source hashes · original README · original manifest · additive publication note