-1~0.005s-1的流動應(yīng)力行為?；贔ields–Backofen 方程,確定工業(yè)純鈦應(yīng)變速率敏感性及應(yīng)變強化指數(shù)隨溫度的定量變化。結(jié)果表明：工業(yè)純鈦的應(yīng)變速率敏感性在283K-423K不顯著,應(yīng)變強化指數(shù)在353K-573K隨溫度變化而增加?；跍囟茸兓男拚虵ields–Backofen 方程,建立了能夠描述工業(yè)純鈦塑性流動應(yīng)力行為的數(shù)學(xué)模型。同時,考慮應(yīng)變、應(yīng)變速率及溫度之間的相互作用,對傳統(tǒng)的Johnson-Cook 方程進行改進。與傳統(tǒng)的Johnson-Cook 方程相比,改進型的Johnson-Cook 方程與實驗結(jié)果吻合更好,證明改進型Johnson-Cook 方程預(yù)測工業(yè)純鈦塑性流動應(yīng)力的精確性。"/>

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工業(yè)純鈦在中低溫下的Fields–Backofen和改進型Johnson-Cook方程
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南京工業(yè)大學(xué)機械與能源動力工程學(xué)院,南京工業(yè)大學(xué)機械與能源動力工程學(xué)院,南京工業(yè)大學(xué)機械與能源動力工程學(xué)院,南京工業(yè)大學(xué)機械與能源動力工程學(xué)院,南京工業(yè)大學(xué)機械與能源動力工程學(xué)院

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國家自然科學(xué)基金項目（面上項目，重點項目，重大項目）


Fields–Backofen and a modified Johnson-Cook model for CP-Ti at ambient and intermediate temperature
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School of Mechanical and Power Engineering,Nanjing Tech University,School of Mechanical and Power Engineering,Nanjing Tech University,School of Mechanical and Power Engineering,Nanjing Tech University,School of Mechanical and Power Engineering,Nanjing Tech University,School of Mechanical and Power Engineering,Nanjing Tech University

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National Natural Science Foundation of China (51172063, 51202056, 51372068); Natural Science Foundation of Hebei Province, China (E2012401070)

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    摘要:

    通過單軸拉伸試驗研究工業(yè)純鈦在283K至573K下應(yīng)變速率范圍為0.00005s-1~0.005s-1的流動應(yīng)力行為?；贔ields–Backofen 方程,確定工業(yè)純鈦應(yīng)變速率敏感性及應(yīng)變強化指數(shù)隨溫度的定量變化。結(jié)果表明：工業(yè)純鈦的應(yīng)變速率敏感性在283K-423K不顯著,應(yīng)變強化指數(shù)在353K-573K隨溫度變化而增加?；跍囟茸兓男拚虵ields–Backofen 方程,建立了能夠描述工業(yè)純鈦塑性流動應(yīng)力行為的數(shù)學(xué)模型。同時,考慮應(yīng)變、應(yīng)變速率及溫度之間的相互作用,對傳統(tǒng)的Johnson-Cook 方程進行改進。與傳統(tǒng)的Johnson-Cook 方程相比,改進型的Johnson-Cook 方程與實驗結(jié)果吻合更好,證明改進型Johnson-Cook 方程預(yù)測工業(yè)純鈦塑性流動應(yīng)力的精確性。

    Abstract:

    The flow stress behavior of commercial pure titanium (CP-Ti) was studied by uniaxial tension tests at temperatures ranging from 283SK to 573SK and strain rates from 0.00005-0.005s-1. The tensile properties of CP-Ti was investigated to determine the quantitative variation of the strain rate sensitivity and the strain hardening by temperature based on Fields–Backofen (FB) model. The results indicates that the strain rate sensitivity of CP-Ti at 283K-423K is not obvious and strain hardening index increases with temperature at 353K-573K. A mathematical model using an updated FB equation based on temperature changing was established to describe the plastic flow stress behavior of CP-Ti. Meanwhile by considering the coupled effects of strain, strain rate and temperature, a modified Johnson-Cook(JC) model was proposed to predict the flow behavior. Compared with the original JC model, the modified JC model shows more agreement with the experimental stress, which validates the accuracy of the modified model describing the plastic flow stress of CP-Ti.

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常樂,周昌玉,彭劍,李建,賀小華.工業(yè)純鈦在中低溫下的Fields–Backofen和改進型Johnson-Cook方程[J].稀有金屬材料與工程,2017,46(7):1803~1809.[Chang Le, Zhou Changyu, Peng Jian, Li Jian, He Xiaohua. Fields–Backofen and a modified Johnson-Cook model for CP-Ti at ambient and intermediate temperature[J]. Rare Metal Materials and Engineering,2017,46(7):1803~1809.]
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  • 收稿日期:2015-05-10
  • 最后修改日期:2015-07-12
  • 錄用日期:2015-09-06
  • 在線發(fā)布日期: 2017-11-14
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