Stress Wave Propagation Discipline and Simulation Analysis in Non-Homogeneous Laminated Composites

2011 ◽  
Vol 211-212 ◽  
pp. 823-826
Author(s):  
Jia Yao ◽  
Wan Jiang Wu ◽  
Ya Qin Li ◽  
Ming Hui Han ◽  
Li Wei Jiang
Keyword(s):  
Wave Propagation ◽  
Stress Wave ◽  
Simulation Analysis ◽  
Laminated Composites ◽  
Wave Theory ◽  
Simulation Method ◽  
Stress Wave Propagation ◽  
Destructive Testing ◽  
Element Simulation ◽  
Non Destructive

Application of stress wave testing methods can realize non-destructive testing of composites, but non-homogeneous characteristics of composites determine the complexity of stress wave propagation. Using the stress wave theory to explain the propagation principle, to describe the stress situation in the composites, which is meaningful to perfect the stress wave testing method. In this paper, stress wave propagation principle of non-homogeneous laminated composites has been revealed, mathematical descriptions of stress wave propagation are also given, and finite element simulation method has been used to verify the theory.

Numerical Simulation of the Rock Bolts Non-Destructive Testing Based on ANSYS

2011 ◽  
Vol 90-93 ◽  
pp. 738-743
Author(s):  
Xiao Yun Sun ◽  
Jiu Long Cheng ◽  
Yun Sheng Wang ◽  
Dong Fang Zhang
Keyword(s):  
Numerical Simulation ◽  
Stress Wave ◽  
Simulation Method ◽  
Stress Wave Propagation ◽  
Finite Domain ◽  
Three Dimension ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Rock Bolts ◽  
Non Destructive

A numerical simulation method of the rock bolts non-destructive testing based on ANSYS is presented. ANSYS/ LS-DYNA which is a kind of software of rock bolts dynamic finite domain analysis is used to establish a three-dimension model, after sine curve excitation is loaded, the reflection curve of naked rock bolts, or rock bolts with different defects are got, and the relationship curve between elastic modulus and stress wave velocity are got correspondingly. Experiment result proved that the aboved method was satisfied to simulate the stress wave propagation and the reflection situation in the rock bolts.

A Parabolic Theory of Stress Wave Propagation Through Inhomogeneous Linearly Elastic Solids

1977 ◽  
Vol 44 (3) ◽  
pp. 462-468 ◽  
Author(s):  
J. J. McCoy
Keyword(s):  
Wave Propagation ◽  
Energy Transfer ◽  
Numerical Computation ◽  
Stress Wave ◽  
Wave Equations ◽  
Coupled System ◽  
Wave Theory ◽  
Propagation Direction ◽  
Stress Wave Propagation ◽  
Elastic Solids

A theory, in the form of a coupled system of reduced parabolic wave equations (equations (42)), is developed for stress wave propagation studies through inhomogeneous, locally isotropic, linearly elastic solids. A parabolic wave theory differs from a complete wave theory in allowing propagation only in directions of increasing range. Thus, when applicable, it is well suited for numerical computation using a range-incrementing procedure. The parabolic theory considered here requires the propagation directions to be limited to a cone, centered about a principal propagation direction, which might be described as narrow-angled. Further, the theory requires that the effects of diffraction, refraction, and energy transfer between the dilatational and distortional modes are gradual enough that coupling between them can be ignored over a range of several wavelengths. Precise conditions for the applicability of the theory are summarized in a series of inequalities (equations (44)).

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