ULTRALIGHT-HYBRID VEHICLE DESIGN: OVERCOMING THE BARRIERS TO USING ADVANCED COMPOSITES IN THE AUTOMOTIVE INDUSTRY

The paper examines the barriers preventing the automotive industry from adopting advanced composite materials in the body-in-white (BIW) and proposes a "leapfrog" strategy. Instead of incremental component substitution, the authors advocate for a clean-sheet, all-composite monocoque design. This approach is presented as essential for the "hypercar" concept, where extreme mass reduction creates synergies with hybrid-electric drivetrains, reducing the size and cost of propulsion systems. The document analyzes various manufacturing technologies, such as resin transfer molding (RTM) and E-beam curing, and argues that the high cost of carbon fiber can be offset by significant mass reductions and reduced assembly complexity. It concludes that the primary obstacles are cultural inertia and a lack of familiarity among automakers rather than intractable technical limits.

• Advanced composite bodies-in-white (BIW) can be up to 67% lighter than conventional steel unibodies of equivalent size and safety.
• The "hypercar" concept combines an ultralight monocoque body with hybrid-electric drive to achieve significant reductions in curb mass (2-3 fold), air drag (2-3 fold), and fuel consumption (5-10 fold).
• A "leapfrog" approach to composite integration—replacing the entire BIW rather than substituting individual parts—can reduce assembly costs to approximately 10% of those for a steel BIW due to a radical decrease in parts count.
• The primary barriers to the adoption of structural composites in the auto industry are cultural and organizational, specifically automakers' inexperience and unfamiliarity with the materials, rather than purely technical issues.
• Analysis using the IBIS technical cost model suggests that an all-advanced-composite monocoque BIW could reach manufacturing cost parity with a steel unibody at production volumes of 100,000 vehicles per year.
• Carbon fiber costs can be mitigated through the use of commodity-grade fibers, which have been offered by manufacturers like Zoltek and Akzo Nobel at prices as low as $17.60/kg.

APA

Brylawski, M. M., & Lovins, A. B. (n.d.). ULTRALIGHT-HYBRID VEHICLE DESIGN: OVERCOMING THE BARRIERS TO USING ADVANCED COMPOSITES IN THE AUTOMOTIVE INDUSTRY. RMI. https://rmi.org/app/uploads/2017/05/RMI_Document_Repository_Public-Reprts_T95-39_UHVDAdvCompAuto.pdf

Chicago

Brylawski, Michael M., and Amory B. Lovins. ULTRALIGHT-HYBRID VEHICLE DESIGN: OVERCOMING THE BARRIERS TO USING ADVANCED COMPOSITES IN THE AUTOMOTIVE INDUSTRY. RMI, n.d. https://rmi.org/app/uploads/2017/05/RMI_Document_Repository_Public-Reprts_T95-39_UHVDAdvCompAuto.pdf.

Wikipedia

{{cite report |last1=Brylawski |first1=Michael M. |last2=Lovins |first2=Amory B. |title=ULTRALIGHT-HYBRID VEHICLE DESIGN: OVERCOMING THE BARRIERS TO USING ADVANCED COMPOSITES IN THE AUTOMOTIVE INDUSTRY |publisher=RMI |url=https://rmi.org/app/uploads/2017/05/RMI_Document_Repository_Public-Reprts_T95-39_UHVDAdvCompAuto.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{brylawskindultralighthybrid, author = {Brylawski, Michael M. and Lovins, Amory B.}, title = {{ULTRALIGHT-HYBRID VEHICLE DESIGN: OVERCOMING THE BARRIERS TO USING ADVANCED COMPOSITES IN THE AUTOMOTIVE INDUSTRY}}, institution = {RMI}, url = {https://rmi.org/app/uploads/2017/05/RMI_Document_Repository_Public-Reprts_T95-39_UHVDAdvCompAuto.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }