(1. 中國科學(xué)院沈陽自動(dòng)化研究所，沈陽 110016；
2. 中國科學(xué)院大學(xué)，北京 100049)
摘 要: 為了獲得材料在高應(yīng)變率下的本構(gòu)模型參數(shù)，提出一種基于激光沖擊強(qiáng)化實(shí)驗(yàn)和有限元模擬相結(jié)合的材料本構(gòu)模型參數(shù)獲得方法。該方法首先預(yù)估材料在高應(yīng)變率下的本構(gòu)模型參數(shù)，然后進(jìn)行有限元模擬，以模擬結(jié)果與實(shí)驗(yàn)結(jié)果對(duì)比的誤差落在一定范圍內(nèi)為優(yōu)化目標(biāo)，對(duì)預(yù)估的本構(gòu)模型參數(shù)進(jìn)行修正，并最終得到其具體值。基于此方法，得出TiAl合金在高應(yīng)變率下的Hugoniot彈性極限(HEL)為1.46 GPa。
關(guān)鍵字: 鈦鋁合金；本構(gòu)模型；高應(yīng)變率；激光沖擊強(qiáng)化；有限元模擬
（1. Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China）
Abstract:In order to obtain the material constitutive model parameter at high strain rates, a new method was put forward based on the laser peening experiment andfinite element simulation. Firstly, the constitutive material model parameter was estimated. Secondly, the finite element simulation was undertook with the change of predicted parameter until the error of the simulation results compared with the experimental results falling into a certain range, and then, the estimated parameter specific value was gotten. Based on this method, the Hugoniot elastic limit (HEL) of TiAl alloys at high strain rates was gotten as 1.46 GPa.
Key words: TiAl alloy; constitutive model; high strain rate; laser peening; finite element simulation
