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遼寧工程技術(shù)大學(xué)，遼寧 阜新 123000
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遼寧省教育廳A類項目（2004F052）資助


Liaoning Technical University, Fuxin 123000, China
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    摘要:

    提出了利用梯度塑性理論計算Ti-6Al-4V絕熱剪切帶的局部剪切應(yīng)變新方法。絕熱剪切帶的最大局部塑性剪切應(yīng)變依賴于臨界塑性剪切應(yīng)變、試樣的標(biāo)定長度、絕熱剪切帶總厚度、絕熱剪切帶的平均塑性剪切應(yīng)變。計算表明，隨著絕熱剪切帶總厚度的增加，絕熱剪切帶的最大局部塑性剪切應(yīng)變以非線性方式下降。當(dāng)絕熱剪切帶總厚度的取值接近1 mm時，盡管確定臨界塑性剪切應(yīng)變的方法不同，但是，絕熱剪切帶的最大局部塑性剪切應(yīng)變的計算值差別很小。當(dāng)絕熱剪切帶總厚度取值在0.335~1 mm之間時，絕熱剪切帶的最大局部塑性剪切應(yīng)變的計算值位

    Abstract:

    A new method for assessing the local shear strain in adiabatic shear band (ASB) of Ti-6Al-4V is proposed by using of gradient-dependent plasticity. The maximum local plastic shear strain (MLPSS) in the ASB depends on the critical plastic shear strain, the gage length of Ti-6Al-4V specimen, the total thickness of the ASB and the average plastic shear strain in the ASB. Results show that the MLPSS in the ASB decreases nonlinearly with the increase of the total thickness of the ASB. When the total thickness of the ASB approaches 1mm, although the methods for determining the critical plastic shear strain are different, the calculated values for MLPSSs in the ASB almost remain unchanged. When the total thickness of the ASB is in the range of 0.335~1 mm, the calculated values for MLPSSs in the ASB are found to be in the range of the lower bound (75%) to the upper bound (350%) of the experimental results obtained by Liao and Duffy (1998).

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王學(xué)濱.遼寧工程技術(shù)大學(xué)，遼寧 阜新 123000[J].稀有金屬材料與工程,2009,38(6):1048~1052.[Wang Xuebin. Liaoning Technical University, Fuxin 123000, China[J]. Rare Metal Materials and Engineering,2009,38(6):1048~1052.]
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  • 收稿日期:2008-06-06
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