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Ford Explorer, Jeep Grand Cherokee flunk IIHS passenger-side crash test

The Insurance Institute for Highway Safety (IIHS) has uncovered major safety-related problems while crash testing a number of popular midsize SUVs. Among those that scored an overall rating of "poor," the lowest possible score, are the Ford Explorer and Jeep Grand Cherokee. Both SUVs showed a high risk of injury to a front passenger during the IIHS' passenger-side small overlap front crash test. This test simulates what might happen if a car or SUV strikes an immovable object, like a telephone pole, at 40 mph and with roughly 25-percent of its front width. "Although some vehicles in this group offer very good protection, in other models, the airbags, safety belts and structure showed serious deficiencies," says IIHS chief research officer, David Zuby. "In those SUVs, a front-seat passenger would be at risk of injuries to the head, hip or leg in a right-side small overlap front crash." In the 2018 Ford Explorer, the front of the SUV showed the structure was "seriously compromised" during both driver- and passenger-side small overlap crash testing, according to the IIHS. The lower and upper door hinge pillar showed intrusion levels of 15 and 13 inches, while the door sill itself was pushed inward 6 inches toward the crash test dummy. The IIHS states these results indicate a high probability that a front occupant would suffer injuries to their right hip and lower left leg. The 2018 Jeep Grand Cherokee didn't fare much better. Not only did the Jeep exhibit 10 inches of intrusion at the lower door hinge pillar, the front passenger crash test dummy's head hit the dashboard through the front airbag. Worse still, the side curtain airbag didn't deploy and the front passenger door opened. The IIHS says there is a strong chance this would result in right leg injuries, along with the possibility of a serious head injury. Even vehicles that earned an "acceptable" in the small overlap front crash test showed definite room for improvement. The 2018 Honda Pilot, for example, showed good structural performance during the crash itself. But the front passenger crash test dummy's head slid off the deployed airbag and hit the dashboard hard, indicating a head injury might result in a similar real-world crash scenario. Two other SUVs that scored "acceptable" ratings included the 2018 Nissan Pathfinder and 2018 Toyota Highlander. Scoring top marks of "good," the highest rating, in these IIHS crash tests were the 2018 Volkswagen Atlas, 2018 GMC Acadia, and 2019 Kia Sorento.

Aluminum lightweighting does, in fact, save fuel

When the best-selling US truck sheds the equivalent weight of three football fullbacks by shifting to aluminum, folks start paying attention. Oak Ridge National Laboratory took a closer look at whether the reduced fuel consumption from a lighter aluminum body makes up for the fact that producing aluminum is far more energy intensive than steel. And the results of the study are pretty encouraging. In a nutshell, the energy needed to produce a vehicle's raw materials accounts for about 10 percent of a typical vehicle's carbon footprint during its total lifecycle, and that number is up from six percent because of advancements in fuel economy (fuel use is down to about 68 percent of total emissions from about 75 percent). Still, even with that higher material-extraction share, the fuel-efficiency gains from aluminum compared to steel will offset the additional vehicle-extraction energy in just 12,000 miles of driving, according to the study. That means that, from an environmental standpoint, aluminum vehicles are playing with the house's money after just one year on the road. Aluminum-sheet construction got topical real quickly earlier this year when Ford said the 2015 F-150 pickup truck would go to a 93-percent aluminum body construction. In addition to aluminum being less corrosive than steel, that change caused the F-150 to shed 700 pounds from its curb weight. And it looks like the Explorer and Expedition SUVs may go on an aluminum diet next. Take a look at SAE International's synopsis of the Oak Ridge Lab's study below. Life Cycle Energy and Environmental Assessment of Aluminum-Intensive Vehicle Design Advanced lightweight materials are increasingly being incorporated into new vehicle designs by automakers to enhance performance and assist in complying with increasing requirements of corporate average fuel economy standards. To assess the primary energy and carbon dioxide equivalent (CO2e) implications of vehicle designs utilizing these materials, this study examines the potential life cycle impacts of two lightweight material alternative vehicle designs, i.e., steel and aluminum of a typical passenger vehicle operated today in North America. LCA for three common alternative lightweight vehicle designs are evaluated: current production ("Baseline"), an advanced high strength steel and aluminum design ("LWSV"), and an aluminum-intensive design (AIV).

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