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沖擊載荷下TC18鈦合金力學(xué)性能模擬研究
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內(nèi)蒙古自治區(qū)自然科學(xué)基金面上項(xiàng)目(2016MS0112); 內(nèi)蒙古自治區(qū)高等學(xué)校科學(xué)研究項(xiàng)目(NJZY16156); 內(nèi)蒙古科技大學(xué)創(chuàng)新基金項(xiàng)目(2016QDL-B11)


Simulation Analysis of Mechanical Properties of TC18 Titanium Alloy under Impact Loads
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    摘要:

    TC18鈦合金在退火狀態(tài)下的屈服強(qiáng)度非常高,進(jìn)行動(dòng)態(tài)力學(xué)性能測試存在一定困難,可優(yōu)先考慮采用數(shù)值模擬方法對其動(dòng)態(tài)力學(xué)性能進(jìn)行研究,而數(shù)值模擬結(jié)果的精確性主要取決于合金本構(gòu)方程的精確性。為了減少數(shù)值模擬與實(shí)驗(yàn)結(jié)果之間的差異,在Johnson-Cook模型的基礎(chǔ)上做了調(diào)整,利用ABAQUS軟件的子程序接口自定義了材料本構(gòu)子程序UMAT,以代碼的形式來擴(kuò)展ABAQUS程序的功能。通過與ABAQUS/Standard軟件分析結(jié)果以及實(shí)驗(yàn)結(jié)果的對比,驗(yàn)證了自定義材料本構(gòu)子程序UMAT計(jì)算結(jié)果的精確性與可靠性。該研究可為TC18鈦合金的結(jié)構(gòu)設(shè)計(jì)提供參考。

    Abstract:

    TC18 titanium alloy displays very high yield strength in the annealed state, so it is difficult to test the dynamic mechanical properties.Constitutive models are enormously helpful numerical tools to predict its dynamic mechanical properties,tested difficultly by experiments. An exact constitute model plays an important role in developing a realistic finite element(FE) model of the dynamic mechanical properties. But, the correctness of FE is the main issue. The classic Johnson-Cook model leads to poor efficiency in predicting the dynamic mechanical properties. In order to reduce the difference between numerical simulation and experimental results, the modified classic Johnson-Cook model is established by the subroutine interface(UMAT) provided by ABAQUS. By comparing with ABAQUS/Standard analysis results and experimental results, the accuracy and reliability of the UMAT calculation results of the custom material constitutive subroutine are verified, which provides a reference for the structural design of TC18 titanium alloy.

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.沖擊載荷下TC18鈦合金力學(xué)性能模擬研究[J].鈦工業(yè)進(jìn)展,2019,36(6):13-18.

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  • 在線發(fā)布日期: 2020-02-17
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