On vibrational behavior of pulse detonation engine tubes

Mirzaei, Majid; Asadi-Aghbolaghi, Maryam; Akbari, Ramin

doi:10.1016/j.ast.2015.09.036

Cited by 12 publications

(14 citation statements)

References 23 publications

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“…The start of the moving impulsive load at the entrance of the tube produces instant radial displacement, which consists of both shear and bending components. 10,11 The shear component moves at the speed of 2742 m s −1 , which in this case, is faster than the moving load speed. There is an even faster longitudinal wave that moves at 5357 m s −1 but is not visible on the diagrams or schematics of Fig.…”

Section: Simulation Resultsmentioning

confidence: 94%

“…Figure a and b shows a pictorial view of the formation and travelling of the stress waves in the tube wall. The start of the moving impulsive load at the entrance of the tube produces instant radial displacement, which consists of both shear and bending components . The shear component moves at the speed of 2742 m s −1 , which in this case, is faster than the moving load speed.…”

Section: Resultsmentioning

confidence: 96%

“…The simulated elastodynamic response was compared with the available analytical solutions. 10,11 Figure 5 shows the results for a time period of 420 μs, which includes the initial detonation loading period (238 μs) and the subsequent reflections of the flexural waves at the tube end. The analytical and FE responses are compared at the distance of 15 cm from the entrance of the tube.…”

Section: Simulation Resultsmentioning

confidence: 99%

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On the role of stress waves in dynamic rupture of cylindrical tubes

Mirzaei

Tavakoli

Najafi

2017

Fatigue Fract Eng Mat Struct

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A systematic experimental/computational study was performed to investigate the role of stress waves in ductile fracture of cylindrical tubes. The stress waves were created by high‐speed moving load, which was produced by detonation of explosive cord inside two intact and two pre‐flawed steel tubes. Several distinct phenomena like cyclic crack growths in Modes I and III, crack flap bulging and crack curving/branching were observed and simulated by finite element (FE) method. The FE models were composed of 3D brick elements equipped with interface cohesive elements. The analysis results showed that the crack growths in Modes I and III were governed by the detonation‐induced stress waves. The crack speeds were obtained based on the increments of cyclic crack growth and the time period of the stress waves. The estimated crack speed range was 63–230 m s−1 for the axial growth, whereas the average speed for growth in Mode III was 100 m s−1.

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Section: Simulation Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 96%

Section: Simulation Resultsmentioning

confidence: 99%

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On the role of stress waves in dynamic rupture of cylindrical tubes

Mirzaei

Tavakoli

Najafi

2017

Fatigue Fract Eng Mat Struct

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“…Mirzaei et al [2] proposed a modification of the analytical solution presented in [15] by including sequential DLs. The accuracy of the analytic model described in [2] has improved using a modified loading function by Mirzaei et al [17], and the formulations have extended to cover orthotropic material behavior. More recently, analyzing detonation loads under different conditions were developed by Mirzaei et al [18,19]and Malekan et al [20,21].…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

“…Surface temperature exceeds 1000 °C under the multiple detonation loads in the pulse detonation engines. In addition, for cases where the pressure at the detonation front goes too high (more than 10-20 MPa), the mechanical strains/stresses of the detonation tube get higher after each DL cycle [2,17]. The traditional single-phase homogeneous material has been less effective to sustain in this kind of situation, considering high cycles of detonation loads travel the engine structure in each second (for a 100 Hz detonation engine).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

On the vibrational responses of thin FGM tubes subjected to internal sequential moving pressure

Malekan

Khosravi

Zanin

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Dynamic load in tubes due to detonation has plenty of applications such as the oil pipeline system and pulse detonation engine. Various experimental, analytical, and numerical investigations have been made to study the elastic-dynamic behaviors of tubes under internal moving pressure, with few studies dedicated to elastic-plastic analysis of this kind of problem. The investigation of elastic-plastic response of a tube made of homogeneous and nonhomogeneous (functionally graded material-FGM) materials subjected to the internal moving pressure (gaseous detonation) is the specific objective of this study. FGM is a newly well-established type of composite materials that its material contents are varying gradually along a user-defined direction. In this work, the effect of non-homogeneity on the vibrational response of the tube was studied using an axisymmetric FE model, which developed by Abaqus ® commercial package accompanied by VUMAT, VDLOAD, and VUSDFLD user-written subroutines. Different detonation load velocities were considered based on the tube material properties, i.e., according to the critical velocities. The presented results showed that the variation of stress/strain fields against time was affected by the gradation of FGM material. In addition, FGM material can help to withstand against the detonation loads, specifically when there are multiple sequential detonations or a high-pressure detonation load.

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