Crack propagation and induced vibration characteristics of cracked cantilever plates under resonance state: Experiment and simulation

Article Engineering, Mechanical

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING (2023)

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Article Engineering, Mechanical

Fatigue crack growth behavior of marine steel under variable amplitude loading-combining DIC technique and SEM observation

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INTERNATIONAL JOURNAL OF FATIGUE (2023)

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Dynamic modeling of rotary blade crack with regard to three-dimensional tip clearance

Xiaodong Zhang et al.

Summary: In this study, a dynamic model of rotary blade cracks considering the three-dimensional blade tip clearance (3D-BTC) was derived and verified. The effects of blade cracks on the 3D-BTC were analyzed, and a numerical calculation method for the 3D-BTC was proposed. Nonlinear damage indicators (NDIs) were calculated to evaluate the severity of blade cracks.

JOURNAL OF SOUND AND VIBRATION (2023)

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Article Mechanics

Micromechanical transverse tensile crack propagation of unidirectional fiber reinforced epoxy SMC slice imbedded in a TDCB specimen

Zhi-Yong Wu et al.

Summary: This study investigates a mode-I type of crack propagation and branching in unidirectional (UD) fiber reinforced epoxy sheet molding compounds (SMC) using a fracture energy failure mechanisms methodology. A tapered double cantilever beam (TDCB) tensile sample is selected as the far-field boundary to eliminate the influence of structural boundary conditions on tip K value. By applying the transverse tensile load to the embedded TDCB (E-TDCB) samples, crack propagation is achieved with minor tip K oscillation. Experimental tests using E-TDCB and dummy TDCB (D-TDCB) samples are conducted and the dynamic crack propagation parameters are measured and analyzed. The numerical prediction based on the proposed constitutive law correlates well with the experimental results.

COMPOSITE STRUCTURES (2023)

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Article Engineering, Mechanical

Dynamic characteristic analysis of rotating blade with breathing crack

Qian Xiong et al.

Summary: This study proposes a nonlinear dynamic model for a rotating cracked blade considering the breathing effect, and a new crack fault diagnosis indicator is also proposed. Verification and analysis show that the severity of the crack affects the energy response, and vibration characteristic parameters can be effectively used for crack fault diagnosis.

MECHANICAL SYSTEMS AND SIGNAL PROCESSING (2023)

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Article Engineering, Mechanical

Simulation and experiment study for aero-engine turbine blade grinding descaling with single grain

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JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY (2022)

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An identification method for excitation location and its application in faults location

Jinsong Yang et al.

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING (2022)

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Article Engineering, Mechanical

Coupling vibration characteristics of the shaft-disk-drum rotor system with bolted joints

Tianrui Yang et al.

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING (2022)

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Article Mathematics, Applied

Study on dynamic characteristics of a rotating cylindrical shell with uncertain parameters

Tianyu Zhao et al.

Summary: This paper developed a super-parametric shell element to establish the rotating cylindrical shell model using the finite element method. Parameter uncertainties were considered in the study of the dynamic response of the rotating cylindrical shell. The accuracy of the model was validated through experiments and commercial software ANSYS. A multivariate Chebyshev polynomial interval analysis method was proposed to solve the multi-parameter uncertainty problem of the rotating cylindrical shell, showing significant advantages in computational efficiency compared to the scanning method. The effects of different uncertain parameters on the dynamic response of the rotating cylindrical shell were studied.

ANALYSIS AND MATHEMATICAL PHYSICS (2022)

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Article Engineering, Mechanical

Nonlinear forced vibration analysis of a multi-cracked Euler-Bernoulli curved beam with inclusion of damping

X. Zhao et al.

Summary: This paper studies the nonlinear forced vibration of a multi-cracked curved beam with damping effects and derives the closed-formed analytical solution. A new transfer matrix method is proposed based on Green's functions. The validity of the analytical solution is verified through experiments, finite element results, and existing analytical solutions. The effects of crack depth and location on vibration are investigated, as well as the interaction between two cracks of the curved beam.

MECHANICAL SYSTEMS AND SIGNAL PROCESSING (2022)

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Article Chemistry, Physical

A Novel Blade Vibration Monitoring Experimental System Based on Blade Tip Sensing

Haoqi Li et al.

Summary: The non-intrusive blade tip timing (BTT) technique is considered a potential tool for condition monitoring of turbomachinery, but it faces challenges of under-sampled signal processing, especially at high rotating speeds which may compromise the stability of the test rig and the time resolution of the data acquisition system (DAS).

MATERIALS (2022)

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Article Engineering, Mechanical

Nonlinear dynamic behavior of rotating blade with breathing crack

Laihao Yang et al.

Summary: A novel nonlinear rotating cracked blade model is developed to investigate the dynamic behavior of rotating blades with transverse cracks. The model effectively captures the dynamic characteristics of the rotating blade and introduces a nonlinear damage indicator (NDI) to estimate the severity level of the crack. Severe cracks are found to significantly reduce the stiffness of the rotating blade and cause a lower resonant frequency, while super-harmonic resonances are identified as indicators for diagnosing the crack existence, with third-order super-harmonics being a distinct indicator for severe cracks.

FRONTIERS OF MECHANICAL ENGINEERING (2021)

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Article Metallurgy & Metallurgical Engineering

Experimental investigation on fatigue of blade specimen subjected to resonance and effect of a damping hard coating treatment

Chen Yu-gang et al.

Summary: This paper presents experimental results of fatigue behavior of compressor blade specimen subjected to resonance, along with the effects of a damping hard coating on relieving fatigue progress. Significant nonlinear features were observed in the spectrum of the blade with a fatigue crack, and a finite element model was established to simulate the vibration behavior of the cracked blade. Depositing a NiCrAlY coating on the blade was shown to increase its fatigue life in the experiments.

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Failure analysis and design optimization of shrouded fan blade

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ENGINEERING FAILURE ANALYSIS (2021)

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Failure and metallurgical defects analysis of IN-738LC gas turbine blades

M. Attarian et al.

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ENGINEERING FAILURE ANALYSIS (2021)

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Article Acoustics

Crack propagation monitoring of rotor blades using synchroextracting transform

Xu Jinghuia et al.

Summary: Blade fatigue fracture is a serious aero-engine fault that requires monitoring blade crack propagation to ensure safety. Utilizing synchroextracting transform with high time-frequency resolution can detect the natural frequency shift of cracked blades earlier, which is crucial for crack propagation monitoring.

JOURNAL OF SOUND AND VIBRATION (2021)

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Article Nuclear Science & Technology

Integrity Evaluation of a Reactor Pressure Vessel Based on a Sequential Abaqus-FRANC3D Simulation Method

M. Annor-Nyarko et al.

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SCIENCE AND TECHNOLOGY OF NUCLEAR INSTALLATIONS (2021)

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Mechanism and modeling of fatigue crack initiation and propagation in the directionally solidified CM186 LC blade of a gas turbine engine

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The influence of heat treatment on the behavior of fatigue crack growth in welded joints made of S355 under bending loading

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A numerical approach to simulate 3D crack propagation in turbine blades

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Dynamic analysis of cracked rotating blade using cracked beam element

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Crack propagation and induced vibration characteristics of cracked cantilever plates under resonance state: Experiment and simulation

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