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temperatures and punch velocities were investigated by the small punch test. Based on SPT load-displacement curves and combined with theoretical analysis, a method for determining super-plastic constitutive... and viscosities of Zr41.2Ti13.8Cu12.5Ni10Be22.5 BMG under different test conditions are obtained, and the super-plastic constitutive relations of the alloy are determined. Key words: small punch test; bulk......
relationship between dislocation variables and flow stress. On the other hand, power law constitutive equations have been often used in tensile superplasticity and creep research and are especially suitable... work, we established the constitutive relationship of dislocation density and number of dislocations with Z parameter during hot tensile deformation [51]. However, calculation is not made there. Here......
compression tests of AZ81 magnesium alloy were performed on Gleeble-1500 at deformation temperature of 320-440 ℃ and strain rate of 0.01-10 s-1. The results show that the relationship between stress and strain... condition what offer a experimental theoretical basis for close-pressing net-shape. Key words: as-extruded AZ81 alloy; hot compression simulation; flow stress; constitutive model 镁的密度小,是最轻的金属结构材料,与铸造镁......
SHPB实验数据构建的流变方程是合理的,这为Al-Mg-Sc板料高应变速率下有限元分析需要的材料变形特性参数提供了重要的数据来源. 关键词:Al-Mg-Sc合金;高应变速率;微型SHPB装置;流变方程;遗传算法 中图分类号:O 344;TP 18 文献标识码:A Constitutive equation of flow for Al-Mg-Sc... effect under high strain rate. A more reasonable Johnson-Cook equation by comparing is chosen to analyze the dynamic mechanical properties of Al-Mg-Sc alloy after its relationship parameters are fitted......
不同温度下铝锶合金峰值应力与应变速率之间的关系 Fig. 6 Relationship between peak stress and strain rate of Al-Sr alloy at different temperatures 铝锶合金连续挤压过程中没有发生相变,假定在一定范围内热变形激活能Q与变形温度T无关[33],对式(4)求偏微分可得到如下方程...;Relationship between and at different temperatures 图8 关系图 Fig. 8 Relationship between and T-1 at different strain rates 金属材料高温塑性变形行为是材料内部微观变形机理和显微组织演化的综合表现.Zener和Hollomon研......
Dynamic compressive behavior and constitutive relations of lanthanum metal王焕然,蔡灿元,陈大年,马东方,邓高涛Mechanics and Materials Science Research Center,Ningbo University摘 要:The dynamic compressive behavior and constitutive relations of Lanthanum(La) metal was determined by using the first compression in split Hopkinson pressure bar(SHPB) tests at different strain......
Dynamic compressive behavior and constitutive relations of lanthanum metal王焕然,蔡灿元,陈大年,马东方,邓高涛Mechanics and Materials Science Research Center,Ningbo University摘 要:The dynamic compressive behavior and constitutive relations of Lanthanum(La) metal was determined by using the first compression in split Hopkinson pressure bar(SHPB) tests at different strain......
铌微合金钢高温变形的本构关系贾斌1,彭艳1(1.河北省秦皇岛市燕山大学亚稳材料制备技术与科学国家重点实验室轧制设备及成套技术教育部工程研究中心)摘 要:采用Gleeble-3500热模拟实验机,对铌微合金钢Q345B进行热压缩实验.基于所获实验结果,充分考虑了热变形工艺参数(应变速率和变形温度)和动态软化机制(动态回复和动态再结晶)对流变应力的影响,建立了一种考虑动态软化机制影响的高温变形显式本构模型,给出了本构方程求解的方法,确定了模型中与工艺参数相关的主要参数的定量关系式;其主要特点是能够较准确地描述材料在......
]. 中国有色金属学报, 2021, 31(3): 659-668. DOI: 10.11817/j.ysxb.1004.0609.2021-39699 LIU Xiao, YANG Hui, ZHU Bi-wu, et al. Flow behavior and constitutive model for pre-deformed AZ31 magnesium alloy under high...; (8) 图6所示为与关系图.由此可以确定C1为0.190,的拟合线如图7所示.通过拟合线的斜率可以确定C2值为0.190. 图4 与关系图 Fig. 4 Relationship curve between and 图5 与关系图 Fig. 5 Relationship......
, 39(8): 109-114. DU Jingxia, LI Hongbo, ZHANG Yanshu, et al. Investigation on constitutive relationship of 300M high strength steel during hot deformation[J]. Forging & Stamping Technology, 2014...; 文章编号:1672-7207(2017)06-1439-09 Flow behaviors and constitutive model of 300M high strength steel at elevated temperature ZHANG Xiaoting1, HUANG Liang1, LI Jianjun1, ZHANG Xuanyue1, ZENG......