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Automotive Engineering ›› 2023, Vol. 45 ›› Issue (7): 1263-1275.doi: 10.19562/j.chinasae.qcgc.2023.07.017

Special Issue: 车身设计&轻量化&安全专题2023年

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Fatigue Simulation and Experimental Study of Super-size Integral Die Casting Aluminum Alloy Rear End Body

Weihe Zeng(),Ligang Gou,Yu Luo,Jun Zhang,Huihong Liao   

  1. Geely Automobile Research Institute Ningbo Co. ,Ltd. ,Ningbo  315336
  • Received:2022-11-29 Revised:2023-01-17 Online:2023-07-25 Published:2023-07-25
  • Contact: Weihe Zeng E-mail:weihe.zeng@geely.com

Abstract:

For the durability development problem of an vehicle with super-size integral die casing aluminum alloy rear end body, the E-N data of the cast aluminum alloy for the die casting body is tested and the key parameters of die-casting alloy E-N curve are obtained by fitting the experimental measured data of fatigue samples. Finite element model of Trim body is built and the dynamic stress response of the die casting body is calculated based on the modal transient method. Rain flow statistics is carried out to the stress time history response signal. Combined with the measured material E-N curve and Miner’s damage accumulation principle., the body fatigue damage of initial design and optimized design are analyzed and compared. Finally, the optimized integral die casting part is loaded into the vehicle for the four-column strengthening durability test. The investigation results show that the E-N relation curve of die casting aluminum alloy can be described by Manson-Coffin-Basquin equation. Compared with the original design, the maximum damage of the improved integrated die casting aluminum alloy body is reduced from 2.67 to 0.32, and the risk of fatigue cracking is eliminated. No cracks are found in the body after the reinforced four-column endurance experiment verification. The research results can provide a reference for the development of integral die-cast aluminum alloy body to achieve the goal of vehicle durability properties.

Key words: integral die casting, cast aluminum body, E-N, fatigue simulation, endurance verification