【摘要】：為了準(zhǔn)確描述鈦合金在高應(yīng)變率、高溫載荷下的熱粘塑性本構(gòu)行為,以及因材料內(nèi)部出現(xiàn)絕熱剪切帶而導(dǎo)致材料流變應(yīng)力減小的定量關(guān)系,構(gòu)造功熱轉(zhuǎn)換系數(shù)β與應(yīng)變率?(5)之間的函數(shù)關(guān)系,提出一種基于修正Johnson-Cook模型的鈦合金熱粘塑性動態(tài)本構(gòu)關(guān)系,并通過以最小二乘法為目標(biāo)函數(shù)的局部搜索優(yōu)化算法,對基于實驗數(shù)據(jù)的本構(gòu)參數(shù)進(jìn)行快速優(yōu)化識別。最后利用應(yīng)力補償更新算法,通過顯式用戶子程序VUMAT將熱黏塑性本構(gòu)模型嵌入ABAQUS軟件中,得到Ti-6Al-4V鈦合金在不同應(yīng)變率、溫度條件下的單軸動態(tài)應(yīng)力-應(yīng)變曲線。數(shù)值模擬結(jié)果與實驗數(shù)據(jù)吻合良好,表明該修正模型能準(zhǔn)確描述鈦合金高應(yīng)變率下的熱黏塑性變形,可適用于各種應(yīng)變率下鈦合金本構(gòu)行為的描述。
[Abstract]:In order to accurately describe the thermal viscoplastic constitutive behavior of titanium alloy under high strain rate and high temperature load, and the quantitative relationship between the flow stress and the internal adiabatic shear band. Based on the modified Johnson-Cook model, a dynamic constitutive relation of thermal viscoplasticity of titanium alloys is proposed. The local search optimization algorithm based on the least square method is used to optimize the relationship between the coefficient of power and heat transfer and the strain rate? (5). The constitutive parameters based on experimental data are quickly optimized and identified. Finally, the thermo-viscoplastic constitutive model is embedded into the ABAQUS software by the explicit user subprogram VUMAT, and the uniaxial dynamic stress-strain curves of Ti-6Al-4V titanium alloy at different strain rates and temperatures are obtained by using the stress compensation update algorithm. The numerical simulation results are in good agreement with the experimental data, which indicates that the modified model can accurately describe the thermo-viscoplastic deformation of titanium alloys at high strain rate, and can be used to describe the constitutive behavior of titanium alloys at various strain rates.
【作者單位】： 四川大學(xué)建筑與環(huán)境學(xué)院;中國工程物理研究院總體工程研究所;
【基金】：國家自然科學(xué)基金委與中國工程物理研究院NSAF聯(lián)合基金資助項目(B1520132013-1)~~
【分類號】：TG146.23

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