The Center for Automotive Research (CAR) was commissioned by NASEM to study vehicle mass reduction for model years 2025-2035. Over the past decade, CAR has been a leader in light-duty vehicle mass reduction research. CAR has done work on assessing the real-world barriers to implementing mass reduction technologies (J. Baron, 2016). CAR also worked with nine global vehicle manufacturers to examine material trends over the next decade (Baron & Modi, 2016). The project still stands as one of the most cooperative and thorough analyses done to date. CAR collected data on 42 vehicles from 4 segments representing 50 percent of the U.S. light-duty fleet. Most recently, CAR has published a Materials and Manufacturing Technology Roadmap (Modi & Vadhavkar),

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The CALM group selected the vehicle roof structure for a co-development lightweighting study because it provides an opportunity for mixed-material application. The baseline vehicle for this research is the 2011 Honda Accord which has a mild steel roof structure. The design space contains twelve parts including the roof panel, roof bows, roof rails, and the headers.

Lightweighting ideas submitted by various CALM members were tested on various qualitative and quantitative parameters such as manufacturing readiness, joining feasibility, reparability, ability of computer simulation, etc. The project team selected four concepts after filtering through various combinations of the lightweighting ideas. All four concepts were studied by computer aided engineering methods including finite element analysis and design of experiments. The performance of the lightweight concepts were compared to the baseline.

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