|
|
|
|
|
Pengfei Wang, Weiqiang Wang, Sanlong Zheng, Bingbing Chen and Zengliang Gao
Nonlinear ultrasonic testing is highly sensitive to micro-defects and can be used to detect hidden damage and defects inside materials. At present, most tests are carried out on specimens, and there are few nonlinear ultrasonic tests for fatigue damage o...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jongbeom Kim, Hong-Pil Ha, Kyung-Mo Kim and Kyung-Young Jhang
The ultrasonic nonlinearity parameter is used to evaluate the nonlinear elasticity of a material, which is determined from the displacement amplitude of the fundamental and second-order frequencies components in an ultrasonic wave propagating through a m...
ver más
|
|
|
|
|
|
|
|
|
|
|
Miguel-Ángel Climent, Marina Miró, Jesús-Nuño Eiras, Pedro Poveda, Guillem de Vera, Enrique-Gonzalo Segovia and Jaime Ramis
This work presents results allowing an unequivocal correlation of the observations of strong nonlinear elastic features of ultrasonic waves (values of the nonlinearity parameters exceeding the thresholds corresponding to undamaged states), with the criti...
ver más
|
|
|
|
|
|
|
|
|
|
|
Saeid Taghizadeh and Robert Sean Dwyer-Joyce
When two rough surfaces are loaded together contact occurs at asperity peaks. An interface of solid contact regions and air gaps is formed that is less stiff than the bulk material. The stiffness of a structure thus depends on the interface conditions; t...
ver más
|
|
|
|
|
|
|
|
|
|
|
Frank Mevissen and Michele Meo
In modern gas turbines, efforts are being made to improve efficiency even further. This is achieved primarily by increasing the generated pressure ratio in the compressor and by increasing the turbine inlet temperature. This leads to enormous loads on th...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jitendra A. Kewalramani, Zhenting Zou, Richard W. Marsh, Bruce G. Bukiet and Jay N. Meegoda
In this paper, nonlinearity associated with intense ultrasound is studied by using the one-dimensional motion of nonlinear shock wave in an ideal fluid. In nonlinear acoustics, the wave speed of different segments of a waveform is different, which causes...
ver más
|
|
|
|
|
|
|
|
|
|
|
Liqiang Guan, Mingxia Zou, Xili Wan and Yifeng Li
This paper investigates the direction identification of micro-cracks with nonlinear components generated by Lamb wave with frequency-mixing technique. Three-dimensional finite element simulations were carried out to investigate the interaction mechanism ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yongqiang Liu, Shixi Yang and Xuekun Liu
The appearance of damage on metallic structures is inevitable due to complex working environments. Non-destructive testing (NDT) of these structures is critical to the safe operation of the equipment. This paper presents a non-destructive damage detectio...
ver más
|
|
|
|
|
|
|
|
|
|
|
Helen Papadaki, Evaggelos Kaselouris, Makis Bakarezos, Michael Tatarakis, Nektarios A. Papadogiannis and Vasilis Dimitriou
The dynamic behavior of solid Si targets irradiated by nanosecond laser pulses is computationally studied with transient, therm?mechanical three-dimensional finite element method simulations. The dynamic phase changes of the target and the generation and...
ver más
|
|
|
|
|
|
|
|
|
|
|
Moisés Brito, Rui M. L. Ferreira, Luis Teixeira, Maria G. Neves and Luís Gil
The main objective of this paper is to characterize the flow field on the front face of an oscillating wave surge converter (OWSC) under a regular wave. For this purpose, the longitudinal and vertical velocity components were measured using an Ultrasonic...
ver más
|
|
|
|
|
|
|
|
|
|
|
Nancy Arana-Daniel
In recent years, the field of complex, hypercomplex-valued and geometric Support Vector Machines (SVM) has undergone immense progress due to the compatibility of complex and hypercomplex number representations with analytic signals, as well as the power ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Guoyang Teng, Xiaojun Zhou, Chenlong Yang and Xiang Zeng
Discrete defects in thick composites are difficult to detect for the small size and the structure noise that appears in multilayer composites. In this paper, a nonlinear method, called recurrence analysis, has been used for characterizing discrete defect...
ver más
|
|
|
|
|
|
|
|
|
|
|
Alina Karki and Junru Wu
The relationship between ultrasonic parameters (attenuation coefficients and velocity) and bone porosity in bovine cancellous bone is explored to understand the possibility of fracture risk diagnosis associated with osteoporosis by applying ultrasound. I...
ver más
|
|
|
|
|
|
|
|
|
|
|
Ilias K. Tragazikis, Alexia N. Koutrakou, Theodoti Z. Kordatou, Panagiota T. Dalla and Theodore E. Matikas
A challenge in the field of material science and concrete technology is to associate material properties and behavior with changes in internal microstructure. A fundamental issue for planning, implementation, and quality control of construction projects ...
ver más
|
|
|
|
|
|