Plastic Flow Stress and Constitutive Model for H96 Brass Alloy

Abstract:

To explore the thermo-mechanical response of H96 brass alloy, the quasi-static (universal-testing machine) and dynamic (the split Hopkinson pressure bar apparatus) uniaxial compression experiments have been performed under the temperatures from 293 K to 873 K and the strain rates from 0.001 s^-1 to 6000 s^-1, and the strains over 60% are obtained. Results show that, H96 brass alloy has strong strain hardening behavior, and it becomes weaker with the increasing temperature. In addition, this alloy is sensitive to strain rates; and, it has temperature sensitivity, the dynamic strain aging occurs at the temperature of 473 K and a quasi-static strain rate of 0.001 s^-1. Based on the thermal activation dislocation mechanism, paralleled with the experimental results, a plastic flow constitutive model with the physical conception is developed. The model is suitable to predict the plastic flow stress at different temperatures and strain rates. According to comparing results, the model predictions are in good agreement with the experimental results.

• Periodical: Applied Mechanics and Materials (Volume 782)
• Pages: 130-136
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.782.130
• Online since: August 2015
• Authors: Ping Zhou, Wei Guo Guo*, Hai Hui Wu
• Keywords: Constitutive Model, H96 Brass Alloy, Plastic Flow Stress, Strain Hardening, Strain Rate Sensitivity, Uniaxial Compression

References

[1] Jiang Hai-bo. Study on numerical simulation and deforming microstructure of H65 brass during continuous extrusion. Dalian: Dalian Jiaotong University. (2010) 9-11.

[2] SUI Xian, SONG Bao-yun, LI Bing, YUN Xin-bing, GAO Fei. Characteristic of microstructure and properties evolution of H65 brass alloy during continuous extrusion process. The Chinese Journal of Nonferrous Metals. 19 (2009) 1049-1054.

[3] WANG Yan-hui, GONG Bing, LI Bing. Flow stress of H65 brass alloy during hot compression deformation. Journal of Plasticity Engineering. 15(2008) 113-117.

[4] Ni Hong-hai. Research on Microforming of H62 Brass by Upsetting. Nanjing: Nanjing University of Aeronautics and Astronautics. (2005) 5-6.

[5] LIU Yu-li, REN Jia-hai, ZHU Ying-xia, YANG He. Stress-strain analysis of bending and springback for thin-wall rectangular tube of H96 brass. Froging & Stamping Technology. 37(2012) 146-148.

[6] GUO Wei-guo. The split Hopkinson pressure bar technique of high temperatures and its application. Journal of Experimental Mechanics. 21 (2006) 447−453.

[7] Zerilli F J, Armstrong R W. The effect of dislocation drag on the stress - strain behavior of FCC metals[J] . Acta Metal lurgicaet Materialia. 40 (1992) 1803-1808.

DOI: 10.1016/0956-7151(92)90166-c

[8] Nemat - Nasser S, Guo W G , Kihl D P. Thermo mechanical response of AL-6XN stainless steel over a wide range of strain rates and temperatures. Journal of Mechanical Physics Solid. 49 (2001) 1832-1846.

DOI: 10.1016/s0022-5096(00)00069-7

[9] QIAN Kuang-wu, LI Xiao-qi, XIAO Lin-gang, CHEN Wen-zhe, ZHANG Hao-guo, PENG Kai-ping. Dynamic strain aging phenomenon in metals and alloys. Journal of Fuzhou University (Natural Science). 29(2001) 8-23.

[10] KOCKS U F, ARGON A S, ASHBY M F. Thermodynamics and kinetics of slip: Progress in materials science. New York, Pergamon Press, (1975).

[11] NEMAT-NASSER S, LI Y L. Flow stress of fcc polycrystals with application to OFHC Cu. Acta Materialia. 46 (1998) 565−577.

DOI: 10.1016/s1359-6454(97)00230-9