All results with Failure Analysis

The Role of Driver-Assistance Technology in Accident Reconstruction

Self-driving cars aren’t here yet, but Advanced Driver Assist Systems (ADAS) are widespread. These systems can independently warn drivers of potential risks, steer, brake and accelerate. As accident reconstruction experts, we can already see the influence of ADAS in the crash data we download from cars. They are changing the way we reconstruct accidents, and […]

HOT SHOCK: Illuminating Evidence of Headlamp Use

Whether a vehicle’s lights were on or off can affect liability for a nighttime car crash. Fortunately, there is often physical evidence of whether a vehicle’s lights were on or off at the time of a collision: hot shock.  An incandescent lightbulb emits visible light when an electric current is passed through the finely coiled […]

Withstanding the Pressures of Failure Analysis using Engineering Fundamentals

Of the four consumer products in the figure above, one does not belong. Which one is it? The disposable propane cylinder is made of steel and holds liquid petroleum gas, which is a two-phase mixture of liquid and gaseous propane. At normal indoor temperatures the pressure inside the container, called its internal pressure, is about […]

Wheel Separation Accidents

Wheels suddenly detach from moving cars and trucks more often than many people think. These ‘wheel separations’ can lead to serious injuries from the vehicle losing control, from the separated wheel colliding with another vehicle or pedestrian, or from another vehicle maneuvering to avoid the projectile. When a wheel separation occurs on a highway, the […]

Expanded information from CPSC assists consumer product investigations

The Consumer Product Safety Commission is a US government agency whose job it is to protect consumers by recalling unsafe products from the marketplace. After identifying a potentially unsafe consumer product, the CPSC, at its discretion, may decide to investigate and if warranted issue a recall. The manufacturer, distributors and retailers of a recalled product […]

Helicopter Crashes Caused by Freewheel Disengagements

Helicopters can land safely after the engine loses power because the rotor blades can continue to turn, or autorotate, and provide lift. Autorotation is enabled by inserting a freewheel between the engine and the rotor. The freewheel locks the engine to the rotor when the engine is applying power to the rotor, but disengages the […]