Longitudinal impact of piezoelectric media

Gazonas, George A.; Wildman, Raymond A.; Hopkins, David A.; Scheidler, Michael J.

doi:10.1007/s00419-015-1042-3

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…Due to the complex characteristics of stress-strain curves for HTPB propellant, the previous method 29 determining the mechanical parameters of highly particle-filled elastomers cannot be effective. In this investigation, based on the method to determine the mechanical parameters of nonmetallic materials, 30 the yield stress r 0 , the associated strain e 0 , and elasticity modulus E were identified on the stress-strain curves in terms of a 1% offset in the total strain, as illustrated in Figure 3.…”

Section: Mechanical Properties and Fracture Mechanismsmentioning

confidence: 99%

Tensile mechanical properties and constitutive model for HTPB propellant at low temperature and high strain rate

Wang¹,

Hu²,

Wang³

et al. 2015

J of Applied Polymer Sci

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To investigate the mechanical properties and fracture mechanisms of hydroxyl-terminated polybutadiene (HTPB) propellant at low temperature and high strain rate, uniaxial tensile tests were conducted over the range of temperatures 233 to 298 K and strain rates 0.4 to 14.14 s 21 using an INSTRON testing machine, and scanning electron microscope (SEM) was employed to observe the tensile fracture surfaces. The experimental results indicate that the deformation properties of HTPB propellant are remarkably influenced by temperature and strain rate. The characteristics of stress-strain curves at low temperatures are different from that at room temperature, and the effects of temperature and strain rate on the mechanical properties are closely related to the changes of properties and the fracture mechanisms of HTPB propellant. The dominating fracture mechanism depends much on the temperature and changes from the dewetting and matrix tearing at room temperature to the particle brittle fracture at low temperature, and the effect of strain rate only alters the mechanism in a quantitative manner. Finally, a nonlinear viscoelastic constitutive model incorporating the damage evolution and the effects of temperature and strain rate was developed to describe the stress responses of this propellant under the test conditions. During this process, the Schapery-type constitutive theories were applied and one damage variable was considered to establish the damage evolution function. The overlap between experimental results and predicted results are generally good, which confirms that the developed constitutive model is valid, however, further researches should be done due to some drawbacks in describing the deformation behaviors at very large strain.

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Section: Mechanical Properties and Fracture Mechanismsmentioning

confidence: 99%

Tensile mechanical properties and constitutive model for HTPB propellant at low temperature and high strain rate

Wang¹,

Hu²,

Wang³

et al. 2015

J of Applied Polymer Sci

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“…The velocity representation formula (14) generates two boundary equations when x tends to the upper and lower boundaries of the piezoelectric element, that is, when x tends to h or 0:…”

Section: Boundary Equationsmentioning

confidence: 99%

“…Using the above assumptions the representation formulas (14) and (16) for the velocity and stress take the following simplified forms:…”

Section: Nonlinear Damper Boundary Conditions and Exact Solutionsmentioning

confidence: 99%

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Exact Time Domain Solutions of 1-D Transient Dynamic Piezoelectric Problems with Nonlinear Damper Boundary Conditions

Khutoryansky¹,

Genis²

2017

JAMP

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Novel exact solutions of one-dimensional transient dynamic piezoelectric problems for thickness polarized layers and disks, or length polarized rods, are obtained. The solutions are derived using a time-domain Green's function method that leads to an exact analytical recursive procedure which is applicable for a wide variety of boundary conditions including nonlinear cases. A nonlinear damper boundary condition is considered in more detail. The corresponding nonlinear relationship between stresses and velocities at a current time moment is used in the recursive procedure. In addition to the exact recursive procedure that is effective for calculations, some new practically important explicit exact solutions are presented. Several examples of the time behavior of the output electric potential difference are given to illustrate the effectiveness of the proposed exact approach.

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