A bilinear constitutive response for polyureas as a function of temperature, strain rate and pressure

Zhang, Xiaoqiong; Wang, Jianjun; Guo, Weiguo; Zou, Ruilu

doi:10.1002/app.45256

Cited by 21 publications

(7 citation statements)

References 63 publications

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“…Hydrogen bond plays a pronounced role in defining the macroscopic properties of polyurea, which can promote physical cross-linking between macromolecules [34]. As is known, natural exposure has a vital impact on the macro-properties and constitutive properties of polyurea coating [35,36,37], but there are only a few studies on the effect of exposure in marine atmosphere on the chemical properties of especially hydrogen bond behavior and phase separation morphology.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Aging Behavior and Mechanism of Polyurea Coating in Marine Atmosphere

et al. 2019

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In this investigation, the aging behaviors of polyurea coating exposed to marine atmosphere for 150 days were studied and the mechanism was analyzed. The influences on surface and mechanical properties, surface morphology, thermal stability behavior, as well as chemical changes evolution of the coating were investigated. By attenuated total reflectance fourier transform infrared spectroscopy (ATR–FTIR) and X-ray photoelectron spectroscopy (XPS), changes in the chemical properties of polyurea coatings before (PCB) and after 150 d (PCA) of aging were analyzed, and emphasis was given to the effect of aging on functional group change, the hydrogen bonding behavior, and phase separated morphology. The results displayed prominent chain scission during aging, such as N–H, C=O, and C–O–C and the hydrogen bonded urea carbonyl content showed a decrease trend. The relative content of soft and hard segments showed a significant change, which increased the degree of phase separation.

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Section: Introductionmentioning

confidence: 99%

Investigations on Aging Behavior and Mechanism of Polyurea Coating in Marine Atmosphere

et al. 2019

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“…In conclusion, it is conceivable that the pressure continues to increase, the true stress will gradually approximate a linear relationship with the true strain. Because it is close to passive confining pressure test gradually [14].…”

Section: Resultsmentioning

confidence: 85%

“…In other words, the environmental pressure around the propellant grains is not atmospheric pressure. Polymers always show pressure‐dependent viscoelastic mechanical behavior [11–14]. So it is of great importance to study the effect of pressure on the mechanical responses of solid propellants.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Modeling the Compressive Behavior of NEPE Propellant under Confining Pressure

Chen

Hou

et al. 2021

Propellants Explo Pyrotec

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In order to study the effects of confining pressure and strain rate on the mechanical properties of the Nitrate Ester Plasticized Polyether (NEPE) propellant, compressive tests were conducted under various confining pressure conditions and strain rates using a new‐designed active gas confining pressure testing machine. The stress‐strain curves and mechanical properties of the NEPE propellant under varying confining pressure conditions and strain rates were obtained. The results show that the compressive mechanical properties of the NEPE propellant are remarkably influenced by the confining pressure and strain rate. The compressive strength under confining pressure is obviously larger than those without applied confining pressure. With the coupled effects of the confining pressure and strain rate, the compressive strength under 5.4 MPa and 6.67×10−2 s−1 is 2.17 times of its value at room condition and 6.67×10−4 s−1. Then, based on previous tensile results, the quantified comparisons of tensile and compressive mechanical properties under different experimental conditions were presented. Finally, a nonlinear constitutive model with damage was constructed to model the effect of pressure. The statistical damage model parameters were defined as ExpDec1 function of pressure P. The calibrated model can accurately predict the mechanical behaviour of the NEPE propellant under different confining pressure conditions and strain rates.

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“…Several constitutive models, such as Amirkhizi et al (2006), Li and Lua (2009), and Zhang et al (2017), have been proposed to describe the stress-strain behavior of polyurea resins. However, many of these constitutive models focus on the compressive characteristics of polyurea resin, while a few have focused on the tensile characteristics.…”

Section: Numerical Simulations For Low-speed Repeated Impact Test Of ...mentioning

confidence: 99%

Reinforcing effect of polyurea resin coating on RC members subject to low-speed and medium-speed impact

Sonoda

Tamai

Ifuku

et al. 2022

Advances in Structural Engineering

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Polyurea resin is widely used as a coating material for various structures owing to its relatively high strength and elongation ability along with applicability in improving the impact and explosion resistance of structures has been studied. Civil engineering structures are generally subjected to relatively low-speed impact loads, such as collisions with vehicles, falling rocks, and flying objects caused by typhoons. However, the reinforcing effect of polyurea resin against low-speed impact loads has not been well studied. The objective of this study is to understand the reinforcing effect of polyurea resin coating on RC members against low-speed and medium-speed impact loads and to evaluate its effectiveness. We conducted low-speed and medium-speed repeated impact tests using a falling weight and flying object on RC cantilevers and slabs coated with polyurea resin, respectively. In addition, numerical simulations were performed using the FEM to qualitatively reproduce the experiments. The results of the low-speed impact test showed that there was no significant reinforcing effect under the first impact. However, when the number of impacts increased, the maximum displacement was significantly suppressed; thus, the improvement of the impact absorption performance was confirmed. In addition, by coating the back side of the RC slab, the prevention of the scattering of concrete pieces was verified in the medium-speed repeated impact test.

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A bilinear constitutive response for polyureas as a function of temperature, strain rate and pressure

Cited by 21 publications

References 63 publications

Investigations on Aging Behavior and Mechanism of Polyurea Coating in Marine Atmosphere

Investigations on Aging Behavior and Mechanism of Polyurea Coating in Marine Atmosphere

Experimental Investigation and Modeling the Compressive Behavior of NEPE Propellant under Confining Pressure

Reinforcing effect of polyurea resin coating on RC members subject to low-speed and medium-speed impact

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