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何力军,房辉,李美岁,马宏昌,陈磊,张健康,许德美,钟景明.室温下多晶铍宏观非弹性回复的数学特征[J].稀有金属材料与工程(英文),2019,48(12):3954~3960.[He Lijun,Fang Hui,Li Meisui,MaHongchang,Chen Lei,Zhang Jiankang,Xu Demei and Zhong Jingming.Mathematical characteristics of macroscopic inelastic recovery of polycrystalline beryllium at room temperature[J].Rare Metal Materials and Engineering,2019,48(12):3954~3960.]
Mathematical characteristics of macroscopic inelastic recovery of polycrystalline beryllium at room temperature
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Received:September 06, 2018  Revised:October 20, 2018
DOI:
Key words: polycrystalline beryllium  cyclic loading/unloading  inelastic recovery  power function
Foundation item:西北稀有金属材料研究院稀有金属特种材料国家重点实验室开放课题基金(SKL2017K001), 宁夏自然科学(NX17037)
Author NameAffiliation
He Lijun,Fang Hui,Li Meisui,MaHongchang,Chen Lei,Zhang Jiankang,Xu Demei and Zhong Jingming  
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Abstract:
      With the uniaxial cyclic loading/unloading test at room temperature, data of the plastic deformation, elastic recovery deformation and inelastic recovery deformation of polycrystalline beryllium samples with different elongation was obtained. Investigation on mathematical characteristics of the inelastic recovery was carried out, and corresponding expression functions were obtained. The result indicates that: after completely unloading, the relationship between inelastic recovery strain and plastic strain of beryllium can be described by the power function; even being incomplete unloading, their relationship can also be described by the power function; all the two function parameters are related to the unloading stress level in analytic form with the square polynomials,and the linear correlativity is presented between the two parameters;in the same unloading cycle, the relationship between inelastic recovery strain and plastic strain can be described by the square polynomials, at least two function parameters show the universal mathematical characteristics beyond specific samples; the modulus of elasticity (also maybe the elongation) is closely relevant to trends of change of all mathematical model parameters..