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

Joint Authors

Othman, Ramzi
Al-Juaid, Abdullah A.

Source

Journal of Engineering

Issue

Vol. 2016, Issue 2016 (31 Dec. 2016), pp.1-9, 9 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2016-03-14

Country of Publication

Egypt

No. of Pages

9

Main Subjects

Civil Engineering

Abstract EN

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.

American Psychological Association (APA)

Al-Juaid, Abdullah A.& Othman, Ramzi. 2016. Modeling of the Strain Rate Dependency of Polycarbonate’s Yield Stress: Evaluation of Four Constitutive Equations. Journal of Engineering،Vol. 2016, no. 2016, pp.1-9.
https://search.emarefa.net/detail/BIM-1108378

Modern Language Association (MLA)

Al-Juaid, Abdullah A.& Othman, Ramzi. Modeling of the Strain Rate Dependency of Polycarbonate’s Yield Stress: Evaluation of Four Constitutive Equations. Journal of Engineering No. 2016 (2016), pp.1-9.
https://search.emarefa.net/detail/BIM-1108378

American Medical Association (AMA)

Al-Juaid, Abdullah A.& Othman, Ramzi. Modeling of the Strain Rate Dependency of Polycarbonate’s Yield Stress: Evaluation of Four Constitutive Equations. Journal of Engineering. 2016. Vol. 2016, no. 2016, pp.1-9.
https://search.emarefa.net/detail/BIM-1108378

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1108378