Forced vibration analysis of blade after selective laser shock processing based on Timoshenko’s beam theory

2020 ◽  
Vol 243 ◽  
pp. 112249 ◽  
Author(s):  
Peilin Fu ◽  
Jianghong Yuan ◽  
Xu Zhang ◽  
Guozheng Kang ◽  
Ping Wang ◽  
...  
Keyword(s):  
Forced Vibration ◽  
Vibration Analysis ◽  
Beam Theory ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Forced Vibration Analysis ◽  
Shock Processing

A Joint-Based Systematic Wave-Propagation Approach for Forced Vibration Analysis of Large Waveguide Systems

2019 ◽  
Vol 19 (07) ◽  
pp. 1950075
Author(s):  
M. Samadzad ◽  
R. Rafiee-Dehkharghani ◽  
A. J. Aref
Keyword(s):  
Wave Propagation ◽  
Forced Vibration ◽  
Vibration Analysis ◽  
Continuous Wave ◽  
Computational Cost ◽  
Beam Theory ◽  
System Matrix ◽  
Wide Range ◽  
Dynamic Loadings ◽  
Forced Vibration Analysis

This paper describes an analytical and numerical continuous wave-based approach for the forced vibration analysis of large waveguide systems. With Timoshenko beam theory as the basis for modeling wave propagation in the waveguides, the refraction of waves at discontinuities is studied analytically. Within this context, the refraction of waves at multi-member joints is formulated. In addition, a joint-based procedure is introduced to assemble analytical joint equations in the global system matrix. The joint-based approach is mathematically equivalent with the existing element-based approaches but has the advantage of accounting for the effects of a rigid joint region explicitly. The method is used to find the response of a large frame subjected to steady-state dynamic loadings with a wide range of frequency excitations. The fidelity of the methodology is verified using finite element simulations. The main advantage of the new approach is that it can analyze arbitrary waveguide systems for a wide range of frequencies, which makes it suited for studying the behavior of complex large systems using a single global matrix with a very low computational cost.

scholarly journals Forced Vibration Analysis of Laminated Composite Shells Reinforced with Graphene Nanoplatelets Using Finite Element Method

2020 ◽  
Vol 2020 ◽  
pp. 1-17 ◽  
Author(s):  
Trung Thanh Tran ◽  
Van Ke Tran ◽  
Pham Binh Le ◽  
Van Minh Phung ◽  
Van Thom Do ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Forced Vibration ◽  
Vibration Analysis ◽  
Shear Deformation Theory ◽  
Laminated Composite ◽  
Thermal Environments ◽  
Forced Vibration Analysis ◽  
Laminated Composite Shells ◽  
Element Method

This paper carries out forced vibration analysis of graphene nanoplatelet-reinforced composite laminated shells in thermal environments by employing the finite element method (FEM). Material properties including elastic modulus, specific gravity, and Poisson’s ratio are determined according to the Halpin–Tsai model. The first-order shear deformation theory (FSDT), which is based on the 8-node isoparametric element to establish the oscillation equation of shell structure, is employed in this work. We then code the computing program in the MATLAB application and examine the verification of convergence rate and reliability of the program by comparing the data of present work with those of other exact solutions. The effects of both geometric parameters and mechanical properties of materials on the forced vibration of the structure are investigated.

Laser shock processing with 20 MW laser pulses delivered by optical fibers

2000 ◽  
Vol 9 (3) ◽  
pp. 235-238 ◽  
Author(s):  
T. Schmidt-Uhlig ◽  
P. Karlitschek ◽  
M. Yoda ◽  
Y. Sano ◽  
G. Marowsky
Keyword(s):  
Optical Fibers ◽  
Laser Pulses ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing

Laser Shock Processing of Ni-Base Superalloy and High Cycle Fatigue Properties

2011 ◽  
Vol 697-698 ◽  
pp. 235-238 ◽  
Author(s):  
L. Zhou ◽  
Y.H. Li ◽  
W.F. He ◽  
X.D. Wang ◽  
Q.P. Li
Keyword(s):  
High Cycle Fatigue ◽  
Laser Pulses ◽  
Fatigue Properties ◽  
Treatment Technique ◽  
Cycle Fatigue ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
First Order ◽  
Shock Processing ◽  
Base Superalloy

A plasma sound wave detection method of laser shock processing (LSP) technology is proposed. Speciments of Ni-base superalloy are used in this paper. A convergent lens is used to deliver 1.2 J, 10 ns laser pulses by a Q-switch Nd:YAG laser, operating at 1 Hz. The influence of the laser density to the shock wave is investigated in detail for two different wavelength lasers. Constant amplitude fatigue data are generated in room environment using notch specimens tested at an amplitude of vibration 2.8 mm and first-order flextensional mode. The results show that LSP is an effective surface treatment technique for improving the high cycle fatigue performance of Ni-base superalloys having a factor of 1.62 improvement in fatigue life.

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