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在现有热态颗粒介质压力成形(HGMF)工艺有限元仿真分析中,需要假设离散性质的颗粒介质为连续体(Drucker-Prager模型),这使得颗粒介质在传压和流动过程中产生拉应力,与实际工艺不相符。为解决此问题,提出离散元与有限元(DE-FE)耦合仿真分析方法。通过颗粒介质传压性能实验和板材热单向拉伸实验得到仿真模型的材料参数,采用Visual Basic语言建立DE-FE耦合仿真平台,分析HGMF工艺成形AA7075-T6圆锥形件的工艺特征,并进行工艺试验验证。研究表明:DE-FE耦合仿真结果与实验结果吻合较好,为解决离散体与连续体耦合作用的力学问题提供新的分析手段。
In the current finite element simulation of hot state granular media pressure forming (HGMF), we need to assume that the discrete particle media is a continuum (Drucker-Prager model), which makes the granular media produce tensile stress during pressure transfer and flow , Does not match the actual process. In order to solve this problem, a coupled simulation analysis method of discrete element and finite element (DE-FE) is proposed. The material parameters of the simulation model were obtained through the pressure transfer experiment of granular media and the thermal uniaxial tensile test of plate. The DE-FE coupled simulation platform was established by using Visual Basic language. The process characteristics of the AA7075-T6 conical shaped part by HGMF process were analyzed and analyzed. Process test verification. The results show that the simulation results of DE-FE are in good agreement with the experimental results, and provide a new analytical method for solving the mechanical problems of the coupling between discrete body and continuum.