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Automotive Engineering ›› 2022, Vol. 44 ›› Issue (6): 945-952.doi: 10.19562/j.chinasae.qcgc.2022.06.017

Special Issue: 车身设计&轻量化&安全专题2022年

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Selection of Body-in-White Material Based on Life Cycle Assessment

Lijun Zhang(),Ze Gao,Haiyan Yu   

  1. School of Automotive Studies,Tongji University,Shanghai  201804
  • Received:2021-10-09 Revised:2021-11-19 Online:2022-06-25 Published:2022-06-28
  • Contact: Lijun Zhang E-mail:tjedu_zhanglijun@tongji.edu.cn

Abstract:

In this paper, life cycle assessment method is adopted to analyze the equivalent carbon emission and energy consumption of a fuel vehicle with four different materials i.e. common steel, advanced high strength steel (AHSS), aluminum alloy and carbon fiber reinforced polymer (CFRP) as the material of its body-in-white in different stages of production, use (driving operation) and recovery after discard, with the influences of driving mileage on the emission reduction effects of different materials discussed. The results show that under current technical conditions, using AHSS and aluminum alloy to replace common steel as the material of body-in-white can reduce carbon emission and energy consumption, while using CFRP to replace common steel may increase the carbon emission and energy consumption. The life cycle carbon emission of aluminum alloy mainly depends on that in its production stage, while the selection of material is related to the carbon emission and energy consumption level in the region: in the region with general carbon emission and energy consumption level, aluminum alloy is superior than AHSS, while in the region with high carbon emission and energy consumption level, AHSS is superior than aluminum alloy. With the increase of driving mileage, the emission reduction effects of aluminum alloy become more remarkable. In a condition that the driving mileage of the fuel vehicle reaches 150 thousand km, it will get the comprehensively optimum carbon emission and energy consumption level when the materials of its body-in-white have a proportion of 77.9% AHSS versus 22.1% aluminum alloy.

Key words: life cycle assessment, light-weighting material, carbon emission, energy consumption