科研之友
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摘要
Polymer fuel tanks with multilayered high-density polyethylene (HDPE) have been utilized extensively in vehicles. However, the temperature-dependent properties affect their usage life and crashworthiness, which need to be predicted and evaluated quantitatively before manufacture. In this paper, the influence of temperature on the materials behavior was investigated experimentally. Tension modulus and yield stress of HDPE at a wider temperature range compared with the previous research, from - 50 to 95 , were measured. Then, the stress-strain constitutive model of HDPE before yield stage was modified by adding thermal strain items in the conventional rule of mixture. Also the relationship between elastic modulus and yield stress was established. From above the achievements, drop tests of HDPE fuel tank filled with oil at various temperatures were simulated and the sensitivity of ambient temperature on the peak crash stress of HDPE fuel tank with various wall thicknesses was compared. The results show that temperature-dependent material data and fluid-structure coupling simulation method are significant for the crashworthiness design and evaluation of HDPE fuel tank. Environmental temperature except changed thickness of tank wall has affected the energy absorption ability obviously, which should be considered at design stage.
- 出版日期2018-3
- 单位北京航空航天大学
