High strain rate tensile and compressive effects in glassy polymers

Abstract

Abstract. Polymers are increasingly used in impact and complex high rate loading applications. Generally, the mechanical response of glassy polymers under high strain rates has been determined in compression. Some research programs have studied the combined effects of temperature and strain rate, still primarily in compression, providing better understanding of the physics behind the observed response and enhancing the models for these materials. However, limited data are available in tension, and even more limited are data describing both the compressive and tensile response of the same glassy polymer. This paper investigates the compressive and tensile response of glassy polymers across a range of stain rates from quasi-static to dynamic. Experimental results from dynamic mechanical analysis, quasi-static compression and tension, and split Hopkinson tension/pressure bars on several representative glassy polymers will be presented. The pressure dependant yield in these materials will be discussed through comparison of the tensile and compressive yield stresses.

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

“…On the other hand, the yield stress increases with an increase in strain rate [25][26][27][28]. In addition, the strain rate sensitivity is more important at high strain rates [29][30][31][32]. The strain rate and the temperature sensitivities are in line with the timetemperature superposition principle as an increase in strain rate has similar effects to a decrease in temperature [23].…”

High Strain Rate Mechanics of Polymers: A Review

“…The challenges associated True Strain Fig. 5 Representative compressive stress-strain curves for a PMMA [128], b PC [19], c PVC [138], and d epoxy [74] across a range of strain rates with these elastomers are similar to those experienced when characterizing many biological materials, giving further motivation to the development of suitable experimental techniques.…”

“…There are several glassy polymers that have been extensively studied at high strain rate in the literature, including polymethylmethacrylate (PMMA) [16,95,100,[123][124][125][126][127][128][129][130][131][132], polycarbonate (PC) [15, 18-20, 100, 110, 124, 126, 127, 133-136], polyvinylchloride (PVC) [137,138] and varying classes of epoxy [23,74,[139][140][141]. The large number of studies on a ''single'' material indicates that it is critical to understand the pedigree of the polymer being tested, including processing history and storage.…”

“…The percent crystallinity and Fig. 6 Peak stress vs. strain rate for a PMMA [16,95,125,[128][129][130][131][132], b PC [19], c PVC [138], and d epoxy [74] across a range of strain rates molecular conformation are highly dependent on the processing history.…”

Tensile Behavior of Polyetheretherketone over a Wide Range of Strain Rates

“…This is another reason to investigate their tensile behavior. In terms of high strain sensitivity, the tensile properties have been reported for several polymers, for instance, polycarbonate [16][17][18], polyvinylchloride [19], polymethylmethacrylate [20], and epoxies [20][21][22], but not for PEEK. In this work, we are interested in assessing the tensile plastic behavior of PEEK for strain rates ranging from 0.0001 to 1000/s.…”