A viscoelastic constitutive relation for the rate-dependent mechanical behavior of rubber-like elastomers based on thermodynamic theory

Guo, Hui; Chen, Yu; Tao, Junlin; Jia, Baohua; Li, Dan; Zhai, Yue

doi:10.1016/j.matdes.2019.107876

Cited by 17 publications

(7 citation statements)

References 28 publications

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“…Accurately obtaining the mechanical characteristics of polyurea elastomer under dynamic load is a prerequisite for the study of the impact resistance mechanism of polyurea‐coated composite structures. The researches on polyurea elastomer mainly involves its quasi‐static and dynamic mechanical properties and constitutive relations 6–9 . Typical researchers such as Sarva and Pathak studied the mechanical properties of polyurea elastomer under uniaxial compression and tension at different strain rates 10,11 .…”

Section: Introductionmentioning

confidence: 99%

“…The researches on polyurea elastomer mainly involves its quasi-static and dynamic mechanical properties and constitutive relations. [6][7][8][9] Typical researchers such as Sarva and Pathak studied the mechanical properties of polyurea elastomer under uniaxial compression and tension at different strain rates. 10,11 Through analysis of its stressstrain relationship, it was found that polyurea elastomer exhibited rubber-state mechanical characteristics at low strain rates and glass-state mechanical characteristics at high strain rates, and its stress-strain curves had significant strain rate correlation.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement effect of polyurea coating on the impact resistance of aluminum foam

Guo

Song

Sun

et al. 2023

J of Applied Polymer Sci

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A polyurea coating was prepared to enhance the impact protection performance of aluminum foam, and its mechanical properties were analyzed. Polyurea‐coated aluminum foam composite specimens were prepared by coating the polyurea on the surface of aluminum foam. The mechanical properties of composite specimens under quasi‐static and dynamic loading were tested, and the stress–strain relationship at different strain rates was analyzed. The deformation process and failure mode of typical specimens under different loading conditions were discussed. The influence of polyurea coating on the energy absorption characteristics of aluminum foam was explained. The results show that when the polyurea is coated on the end surface of aluminum foam specimen, the sawtooth oscillation in the yield plateau stage of the stress–strain curve is weakened. The existence of polyurea coating makes the stress transfer of cell wall of aluminum foam uniform, and can effectively prevent the damage caused by the splash of aluminum foam fragments under high‐speed impact load. Coating polyurea on the opposite to load‐receiving surface of aluminum foam specimen can effectively improve the yield stress of composite specimen under dynamic load, and make the specimen still maintain good integrity after failure. When the polyurea is coated on the end surface of aluminum foam specimen, the final energy absorption per unit volume and the ideal energy absorption efficiency peak of the specimen are improved.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement effect of polyurea coating on the impact resistance of aluminum foam

Guo

Song

Sun

et al. 2023

J of Applied Polymer Sci

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“…Recently, polyurea has received extensive attention for its excellent performance in impact mitigation, due to its excellent mechanical properties [ 25 , 26 , 27 , 28 , 29 ]. The dynamic response of polyurea during impact exhibits strong rate-dependency [ 30 , 31 , 32 ]. With its glass transition during the impact, polyurea can reach a mass of energy dissipation that is correlated to the internal friction induced by deformation and the breakup of phase-segregated morphology [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

Ballistic Performance of Polyurea-Reinforced Ceramic/Metal Armor Subjected to Projectile Impact

et al. 2022

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Although polyurea has attracted extensive attention in impact mitigation due to its protective characteristics during intensive loading, the ballistic performance of polyurea-reinforced ceramic/metal armor remains unclear. In the present study, polyurea-reinforced ceramic/metal armor with different structures was designed, including three types of coating positions of the polyurea. The ballistic tests were conducted with a ballistic gun; the samples were subjected to a tungsten projectile formed into a cylinder 8 mm in diameter and 30 mm in length, and the deformation process of the tested targets was recorded with a high-speed camera. The ballistic performance of the polyurea-reinforced ceramic/metal armor was evaluated according to mass efficiency. The damaged targets were investigated in order to determine the failure patterns and the mechanisms of interaction between the projectile and the target. A scanning electron microscope (SEM) was used to observe the microstructure of polyurea and to understand its failure mechanisms. The results showed that the mass efficiency of the polyurea-coated armor was 89% higher than that of ceramic/metal armor, which implies that polyurea-coated ceramic armor achieved higher ballistic performance with lighter mass quality than that of ceramic/metal armor. The improvement of ballistic performance was due to the energy absorbed by polyurea during glass transition. These results are promising regarding further applications of polyurea-reinforced ceramic/metal armor.

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“…Because of this, there is a need to develop a rapid and reliable scanning system that is able to provide the exact geometry of the sample mounted in the tensile grips. The development of such a system would allow an inverse analysis of the mechanical test and extraction of parameters for both simple, as well as highly sophisticated material models [9,[31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

A 3D Scanning System for Inverse Analysis of Moist Biological Samples: Design and Validation Using Tendon Fascicle Bundles

Dąbrowska

Ekiert

Wójcik

et al. 2020

Sensors

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In this article, we present the design and validation of a non-contact scanning system for the development of a three-dimensional (3D) model of moist biological samples. Due to the irregular shapes and low stiffness of soft tissue samples, the use of a non-contact, reliable geometry scanning system with good accuracy and repeatability is required. We propose a reliable 3D scanning system consisting of a blue light profile sensor, stationary and rotating frames with stepper motors, gears and a five-phase stepping motor unit, single-axis robot, control system, and replaceable sample grips, which once mounted onto the sample, are used for both scanning and mechanical tests. The proposed system was validated by comparison of the cross-sectional areas calculated based on 3D models, digital caliper, and vision-based methods. Validation was done on regularly-shaped samples, a wooden twig, as well as tendon fascicle bundles. The 3D profiles were used for the development of the 3D computational model of the sample, including surface concavities. Our system allowed for 3D model development of samples with a relative error of less than 1.2% and high repeatability in approximately three minutes. This was crucial for the extraction of the mechanical properties and subsequent inverse analysis, enabling the calibration of complex material models.

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A viscoelastic constitutive relation for the rate-dependent mechanical behavior of rubber-like elastomers based on thermodynamic theory

Cited by 17 publications

References 28 publications

Enhancement effect of polyurea coating on the impact resistance of aluminum foam

Enhancement effect of polyurea coating on the impact resistance of aluminum foam

Ballistic Performance of Polyurea-Reinforced Ceramic/Metal Armor Subjected to Projectile Impact

A 3D Scanning System for Inverse Analysis of Moist Biological Samples: Design and Validation Using Tendon Fascicle Bundles

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