Nondestructive evaluation technologies have recently been challenged to inspect thick, layered, conducting materials for fatigue and corrosion damage. Structures that fall into this class, such as airframe wings, pose significant difficulties for conventional inspection techniques. Reflections of ultrasound at layer boundaries cause serious problems for the application of ultrasonic inspection ...

Guided ultrasonic waves are frequently used for both structural health monitoring and nondestructive testing of metallic plate-like structures. Signals resulting from waves generated by one or more fixed piezoelectric transducers can be recorded around the periphery of an area of interest using a non-contact approach such as a scanning laser vibrometer. It is desired to determine the location o...

The paper considers the ways and methods of determining strength wood according to current norms rules. required number samples are tested compared with characteristics in SP 64.13330.2020 “Wood structures”. It is concluded that it impossible use obtained results for calculations building structures, due lack coefficients norms, taking into account vices scale factor. existing nondestructive co...

The use of piezoelectric wafer active sensors (PWAS) for embedded ultrasonic nondestructive evaluation (NDE) is described. PWAS structure and principle of operation are presented. The interaction between PWAS and ultrasonic Lamb waves is modeled and analyzed, and excitation “sweet spots” for preferentially exciting certain Lamb wave modes are identified. Recent trends in guided-wave ultrasonic ...

Fuel channel pressure tubes are critical components of the CANDU reactor core which require periodic inspection to demonstrate continued fitness for service. Ontario Power Generation; Inspection & Maintenance Services Division has been operating a variety of inspection systems to perform volumetric and surface nondestructive examinations of the pressure tubes. Since the early days, ultrasonics ...

In this study, the feasibility of using a one dimensional 16-element flexible ultrasonic transducer (FUT) array for nondestructive testing at 150 °C is demonstrated. The FUT arrays were made by a sol-gel sprayed piezoelectric film technology; a PZT composite film was sprayed on a titanium foil of 75 µm thickness. Since the FUT array is flexible, it was attached to a steel pipe with an outer di...

Many concrete structures in use have safety problems due to material deterioration, actual construction defects, structural damage, etc. Therefore, nondestructive testing is required determine the presence of defects. Ultrasonic technology an important tool testing, which can detect defects and be combined with other methods or models make it more accurate. At present, ultrasonic inspection has...

Recently, a novel nondestructive method so-called Electro-Ultrasonic Spectroscopy (EUS) has been reported. In this technique, the intermodulation signals between mechanical and electrical excitation is measured, so that it offers high signal to noise ratio due to the different frequency range from those of excitation signals. EUS is the method under developing, so that the procedure of EUS shou...

Material state awareness of composites using conventional Nondestructive Evaluation (NDE) method is limited by finding the size and the locations of the cracks and the delamination in a composite structure. To aid the progressive failure models using the slow growth criteria, the awareness of the precursor damage state and quantification of the degraded material properties is necessary, which i...