Imperial College London
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DrZhutaoShao

Faculty of Engineering, Department of Mechanical Engineering

Research Associate
 
 
 
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Contact

 

z.shao12

 
 
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Location

 

City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhang:2020:10.1007/s11340-020-00658-6,
author = {Zhang, R and Shao, Z and Lin, J and Dean, TA},
doi = {10.1007/s11340-020-00658-6},
journal = {Experimental Mechanics},
pages = {1289--1300},
title = {Measurement and analysis of heterogeneous strain fields in uniaxial tensile tests for boron steel under hot stamping conditions},
url = {http://dx.doi.org/10.1007/s11340-020-00658-6},
volume = {60},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - BackgroundA significant amount of uniaxial tensile tests has been carried out using Gleeble systems to investigate the viscoplastic deformation of boron steel (22MnB5) under hot stamping conditions. However, due to heat loss through the end clamps, a temperature gradient in the reduced parallel section of dog-bone shaped specimens is inevitable.ObjectiveIn the work reported in this paper, the effect of temperature gradient on measured outcomes is examined.MethodsUniaxial tensile tests on 1.5 mm thick boron steel specimens are carried out, under hot stamping conditions and strain fields are quantified using the digital image correlation (DIC) technique. The effect of gauge length on the properties of boron steel, as calculated from observed test results, is determined.ResultsCompared with the test at room temperature, a bell-shaped strain distribution occurs within the gauge length even before the appearance of the maximum load. Also, average strain within the gauge length, especially in the later stages, changes with gauge length within the investigated range, and thus, different engineering stress-strain curves and fracture strains are determined. In addition, normalized strain rate is significantly dependent on gauge length, which results in over 16% difference among the computed flow stresses by using a unified constitutive model.ConclusionsThe characterized properties of the material are dependent on gauge length and thus, a testing standard for measuring thermal-mechanical data of materials by using a Gleeble need to be defined.
AU  - Zhang,R
AU  - Shao,Z
AU  - Lin,J
AU  - Dean,TA
DO  - 10.1007/s11340-020-00658-6
EP  - 1300
PY  - 2020///
SN  - 0014-4851
SP  - 1289
TI  - Measurement and analysis of heterogeneous strain fields in uniaxial tensile tests for boron steel under hot stamping conditions
T2  - Experimental Mechanics
UR  - http://dx.doi.org/10.1007/s11340-020-00658-6
UR  - https://link.springer.com/article/10.1007%2Fs11340-020-00658-6
UR  - http://hdl.handle.net/10044/1/82549
VL  - 60
ER  -
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