Viscoplasticité dynamique du polycarbonate: Influence de la vitesse de sollicitation et des traitements de recuit

Steer, Philippe; Rietsch, F.; Clisson, J.; Bouvart, D.

doi:10.1016/0014-3057(86)90121-7

Cited by 2 publications

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The temperature and the strain rate sensitivities are extensively characterized in [3][4][5][6] and [5][6][7][8], respectively. The split Hopkinson pressure bar was largely used to characterize the mechanical properties at high strain rates [9,10]. Hutchings [11] and Sarva et al [12] used Taylor's impact method.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Strain Rate Dependency of Polycarbonate’s Yield Stress: Evaluation of Four Constitutive Equations

Al-Juaid

Othman

2016

Journal of Engineering

View full text Add to dashboard Cite

The main focus of this paper is in evaluating four constitutive relations which model the strain rate dependency of polymers yield stress. Namely, the two-term power-law, the Ree-Eyring, the cooperative, and the newly modified-Eyring equations are used to fit tensile and compression yield stresses of polycarbonate, which are obtained from the literature. The four equations give good agreement with the experimental data. Despite using only three material constants, the modified-Eyring equation, which considers a strain rate-dependent activation volume, gives slightly worse fit than the three other equations. The two-term power-law and the cooperative equation predict a progressive increase in the strain rate sensitivity of the yield stress. Oppositely, the Ree-Eyring and the modified-Eyring equations show a clear transition between the low and high strain rate ranges. Namely, they predict a linear dependency of the yield stress in terms of the strain rate at the low strain rate range. Crossing a threshold strain rate, the yield stress sensitivity sharply increases as the strain rate increases. Hence, two different behaviors were observed though the four equations fit well the experimental data. More experimental data, mainly at the intermediate strain rate range, are needed to conclude which, of the two behaviors, is more appropriate for polymers.

show abstract