Ti6Al4V合金粉末热等静压Shima屈服准则修正
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摘要
采用三种不同的热等静压工艺620℃/80 MPa,775℃/100 MPa和930℃/120 MPa,制备了初始密度不同的Ti6Al4V合金试样.建立了综合考虑偏应力与静水压力作用下粉末材料热等静压作用下的屈服准则,基于不同初始密度的多孔试样的单轴实验,修正了传统的Shima屈服准则,并结合立方体测试件对修正的屈服模型进行了验证.结果表明:单轴实验参数可以有效修正Shima屈服准则,基于修正屈服准则的数值模拟结果与实验结果的误差在5%以内,有效验证了修正后的屈服准则的可靠性.
Ti6Al4V alloy samples with different initial densities were prepared by using three different hot isostatic pressing processes at 620 ℃/80 MPa,775 ℃/100 MPa and 930 ℃/120 MPa.The yield criterion of the powder material under hot isostatic pressing under the action of partial stress and hydrostatic pressure was established.The traditional Shima yield criterion was modified based on the uniaxial experiment of porous specimens with different initial densities.And the modified yield model was validated by using the cube test piece.The results show that the Shima yield criterion can be effectively corrected by the uniaxial experiments.The reliability of the yield criterion is validated by comparison between numerical simulation results and the experimental results.Error between them is less than 5%.
Ti6Al4V alloy samples with different initial densities were prepared by using three different hot isostatic pressing processes at 620 ℃/80 MPa,775 ℃/100 MPa and 930 ℃/120 MPa.The yield criterion of the powder material under hot isostatic pressing under the action of partial stress and hydrostatic pressure was established.The traditional Shima yield criterion was modified based on the uniaxial experiment of porous specimens with different initial densities.And the modified yield model was validated by using the cube test piece.The results show that the Shima yield criterion can be effectively corrected by the uniaxial experiments.The reliability of the yield criterion is validated by comparison between numerical simulation results and the experimental results.Error between them is less than 5%.
引文
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[10]任学平.粉末金属屈服准则和流动应力的研究[D].哈尔滨:哈尔滨工业大学图书馆,1989.
[11]华林,秦训鹏.粉末烧结材料屈服条件研究和进展[J].武汉理工大学学报,2004,26(4):1-5.
[2]Green R J.A plasticity theory for porous solids[J].International Journal of Mechanical Sciences,1972,14(4):215-224.
[3]Oyane M,Shima S,Kono Y.Theory of plasticity for porous metals[J].Bull JSME,1973,16(99):1254-1261.
[4]Shima S,Oyane M.Plasticity theory for porous metals[J].Int J of Mech Sci,1976,18(6):285-291.
[5]Doraivelu S M,Gegel H L,Gunasekera J S,et al.A new yield function for compressible P/M materials[J].Int J of Mech Sci,1984,26(9/10):527-535.
[6]Gurson A L.Continuum theory of ductile repture by void nucleation and growth,part 1:yield criteria and flow rules for porous ductile media[J].ASME J Eng Mater Technol,1975,99(1):297-300.
[7]Doraivelu S M,Gegel H L,Gunasekera J S,et al.A new yield function for compressible P/M materials[J].International Journal of Mechanical Sciences,1984,26(9/10):527-535.
[8]Lee D N,Kim K T.Plastic yield behaviour of porous metals[J].Powder Metallurgy,1992,35(4):275-279.
[9]Park J J.Constitutive relations to predict plastic deformations of porous metals in compaction[J].International Journal of Mechanical Sciences,1995,37(7):709-719.
[10]任学平.粉末金属屈服准则和流动应力的研究[D].哈尔滨:哈尔滨工业大学图书馆,1989.
[11]华林,秦训鹏.粉末烧结材料屈服条件研究和进展[J].武汉理工大学学报,2004,26(4):1-5.