Repeated impacts on composite aero-structures

A single hailstorm can pepper an aircraft wing with thousands of tiny impacts, and over a plane’s lifetime, millions of such minor strikes from ice, stones, or runway debris accumulate in ways engineers do not fully understand. Current aircraft design treats each low-level impact as an isolated event, ignoring the fatigue that builds up from repeated blows. This gap means engineers must over-engineer components, adding weight and burning more fuel, just to be safe. The project will combine physical impact tests with computer simulations to map how composite materials degrade under millions of small, repetitive hits. If successful, the research will produce “impact fatigue allowables”—standard design limits that account for cumulative damage. Manufacturers could then build lighter, more efficient wings and fuselages without sacrificing safety. Lighter aircraft require less engine power, cutting fuel consumption and carbon emissions across the entire fleet. The work is applied, not fundamental: it directly targets a practical bottleneck in aerospace design, where safety regulations currently prevent the use of thinner, more efficient composite structures.