Our reconstruction of the accident showed that the train was not capable of stopping prior to reaching the off-limits location where the pedestrian was standing, based on the available time and distance.
Two vehicles collided at an intersection, causing one vehicle to flip onto its side. The front passenger was not wearing a seatbelt and sustained serious spinal cord injuries. ESi used HVE software to create simulations of the crash sequence, and imported the vehicle motion output into MADYMO to model both “belted” and “unbelted” occupant responses inside the vehicle.
ESi was retained by the subrogation council for the fire origin and cause analysis which also necessitated a structural engineering effort to shore the building and supervise the removal of the damaged roof.
ESi was retained to investigate the failure of a PVC pipe. The pipe showed indications of rapid crack propagation that would be consistent with a high-pressure event. In order to understand the effect of the pre-existing crack on the remaining strength of the pipe, a fracture mechanics analysis was performed.
A large cross-linked polyethylene (XLPE or PEX) storage tank for 93% sulphuric acid failed after approximately seven months of service. The release of acid occurred through circumferential cracks that developed on the bottom panel of the tank near the corner radius with the sidewall.
ESi was retained to conduct a detailed review the construction drawings and specifications, review the product literature, conduct a constructability review to identify and resolve potential issues prior to installation.
A minivan was crossing a set of multiple railroad tracks after a train had backed across the crossing on the near track and was subsequently struck by a through train traveling in the opposite direction. ESi was asked to reconstruct the locations and movements of the vehicles leading up to the crash and determine the influence of the backing train on the crash.
A small aircraft departed for a practice flight in instrument flying conditions. Shortly after takeoff, upon entering the clouds, the aircraft deviated from its clearance, beginning a series of turns, climbs and descents. Ultimately, the aircraft entered a descending right turn and impacted a home.
ESi initiated a comprehensive investigation, examining the material, its processing, the environment within the vessel and the stresses in the material during service.
In a major product liability case that went to trial, Dr. Butler reconstructed a complex tractor semi-trailer accident. The tractor semi-trailer rolled over while traveling down a mountain road.
This project was to determine if a bird strike on the wing of a small single-engine general aviation aircraft was sufficient to result in a loss of control and crash or if it resulted from the actions of the pilot.
This project required our experts to analyze aircraft the ice accretion that would have occurred on a business jet given the meteorological conditions that existed at the time of the aircraft loss of control and accident while on approach to landing.
This project involved the midair between two small single-engine general aviation aircraft that collided after departing a controlled airport. The issue involved determining the flight paths of both aircraft and the visibility from each aircraft to the other.
The project was to analyze and determine the cause of an accident of a Boeing 737 commercial airliner that ran off the runway during the takeoff roll. The aircraft was substantially damaged from impact with the terrain and a post-crash fire
ESi was retained by the manufacturer of personal fall protection equipment to perform a safety analysis and documented risk assessment of a newly designed detachable cable sleeve. This product provides fall protection for workers climbing fixed ladders in multiple industrial applications.
Utilizing the worker’s described scenario as the working hypothesis, data were collected to support or rule out this sequence. ESi’s investigation included a site inspection to evaluate the scene and measure the distances between the platform, ground, and rail.
Eyewitness testimony was inconsistent regarding the initial location. ESi needed to evaluate the physical evidence of the geometry of the staircase, the railings, and her final location to determine what fall scenarios could be consistent with the laws of physics.
ESi was retained to evaluate the pre-impact motion and positions of a tractor semitrailer and a pickup. The intent of the time-distance-speed analysis was to provide an estimate of the coordinate pre-impact motion of the vehicles based on reasonable assumptions for evaluation of the circumstances.
A hopper car loaded with ammonium nitrate was an innocent bystander at West Texas fertilizer distribution facility explosion.
This project involved a passenger car stopped in the roadway, while a garbage truck allegedly backed into the front of the vehicle. The driver claimed she observed the garbage truck backing up for approximately 30 seconds and that the truck was traveling at approximately 30 mph.
In 1994, a Boeing 737 was scheduled to fly 127 passengers from Chicago O'Hare International Airport to Pittsburgh International Airport. The aircraft crashed while on approach to Pittsburgh International Airport, killing all aboard.
ESi was retained to investigate an aviation crash involving airplane impacting power lines and terrain and pilot and passenger fatally injured.
ESi was retained to perform a cause and origin evaluation on a fire in a large power plant.
ESi was retained to perform a study on the degradation of HDPE piping resulting from exposure to the disinfectants used in potable water.
ESi was retained to investigate an accident of a Porsche Carrera GT.
ESi was retained to investigate damage to a rail tank car and subsequent release of hazardous materials resulting from a derailment.
A freight train derailed while passing through the Howard Street tunnel in Baltimore, Maryland.
ESi was retained to determine the cause of failure of a woven polypropylene (PP) belt.
ESi was called in to assess the structural, mechanical, and electrical elements of the Super Dome after Hurricane Katrina.
A large, heavy-lift crane collapsed resulting in three fatalities and extensive damage to the stadium and construction equipment.
United Air Lines Flight 232 crashed and broke apart during the landing attempt.
Biomechanical accident reconstruction analysis methodologies were used to address injury modes associated with human operator involvement with a commercial hand fed tree chipper winch line.
A female pedestrian wearing black clothing was injured when an automatic sliding door closed on her while she was standing at the right door threshold. An accident reconstruction was performed to document the injury mechanism.
A mechanic in a shop that builds MOW specialty vehicles was lifting an articulating crane to mount it on a truck bed when the sling failed. The mechanic was fatally injured when the load fell to the ground and toppled on top of him.
ESi's expertise spans dozens of industries and specializations organized across several practice groups, each staffed by dozens of in-house experts with the technical knowledge, hands-on expertise, and courtroom experience required to execute projects for and with our clients from start to finish.Find an Expert Contact Us