Download or read book Nondestructive Evaluation of Adhesive Bonds Using 20 MHz and 25 kHz Ultrasonic Frequencies on Metal and Polymer Assemblies written by Gilbert B. Chapman II and published by Author House. This book was released on 2014-07-17 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: Demands for improvements in aerospace and automotive energy-efficiency, performance, corrosion resistance, body stiffness and style have increased the use of adhesive bonds to help meet those demands, by providing joining technology that accommodates a wider variety of materials and design options. However, the history of adhesive bond performance clearly indicates the need for a robust method of assuring the existence of the required consistent level of adhesive bond integrity in every bonded region. The Quality Assurance of Adhesive Bonds by Ultrasonic Nondestructive Testing technology put forth in this book meets that need by describing two new, complementary ultrasonic techniques for the evaluation of these bonds, and thus provide improvements over previous methods. The development of a 20 MHz pulse-echo method for nondestructive evaluation of adhesive bonds will accomplish the assessment of bond joints with adhesive as thin as 0.1 mm. This new method advances the state of the art by providing a high-resolution, phase-sensitive procedure that identifies the bond state at each interface of the adhesive with the substrate(s), by the acquisition and analysis of acoustic echoes reflected from interfaces between layers with large acoustic impedance mismatch. Because interface echo amplitudes are marginal when the acoustic impedance of the substrate is close to that of the adhesive, a 25 kHz Lamb wave technique was developed to be employed in such cases, albeit with reduced resolution. Modeling the ultrasonic echoes and Lamb-wave signals was accomplished using mathematical expressions developed from the physics of acoustic transmission, attenuation and reflection in layered media. The models were validated by experimental results from a variety of bond joint materials, geometries and conditions, thereby confirming the validity of the methodology used for extracting interpretations from the phase-sensitive indications, as well as identifying the range and limits of applications. Results from the application of both methodologies to laboratory specimens and to samples from production operations are reported herein, and show that bond-joint integrity can be evaluated effectively over the range of materials and geometries addressed.

Download or read book An Ultrasonic Technique for Non destructive Evaluation of Metal to metal Adhesive Bonds written by James S. Arnold and published by . This book was released on 1956 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nondestructive Evaluation NDE of Adhesive Bonds written by H. Thomas Yolken and published by . This book was released on 2000-12 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Nondestructive Evaluation of Thin Metal coating Bonds written by Edward Webster Russell and published by . This book was released on 1982 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ultrasonic Nondestructive Evaluation of Adhesive Bond Degradation written by Zhenzeng Tang and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A technique which uses the reflected waveform data to obtain the fundamental ultrasonic parameters (transit time, reflection coefficient and attenuation coefficient) of an adhesive bond has also been presented.

Download or read book Exploratory Development of Nondestructive Testing Techniques for Diffusion bonded Interfaces written by George Martin and published by . This book was released on 1969 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report covers exploratory development of nondestructive testing techniques for solid-state diffusion-bonded parts. A literature survey describes the current inspection practices employed on diffusion-bonded laminates and the nature of the interface and bond properties. Test specimens of titanium, columbium, and TD-nickel were prepared for evaluating various test methods. The specimens provided a range of thicknesses and varying degree of bond quality as determined by mechanical property tests. In addition, a number of diffusion-bonded specimens were supplied by the Air Force. Conventional ultrasonic techniques and recently developed selective interface inspection techniques clearly indicate bond conditions where these vary from a no-bond condition to substandard bonds. A number of methods show potential correlation between a quantitative expression of bond quality such as shear or tensile strength. These methods include longitudinal and shear wave velocity, ultrasonic attenuation, and vibration analysis. (Author).

Download or read book Nondestructive Evaluation NDE of Adhesive Bonds written by Nondestructive Testing Information Analysis Center and published by . This book was released on 2000 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: After decades of work to develop bonded primary structures for DoD and NASA applications, there has been little use of adhesive-bonded joints in critical structures. A primary barrier to application of adhesive-bonded structures is a perception of poor reliability. To meet current and future requirements, a review and evaluation of the current state-of-the-art of the NDE knowledge base and hardware for assessing the quality, reliability and integrity of adhesive bonds has been performed by NTIAC with the results documented in this report.

Download or read book Development of Ultrasonic Techniques for Nondestructive Evaluation of Adhesive Bonds written by Gilbert B. Chapman and published by . This book was released on 2007 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nondestructive Evaluation of Adhesive Bonds written by Chandler Harris Amiss and published by . This book was released on 1999 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Second Annual Symposium for Nondestructive Evaluation of Bond Strength written by and published by . This book was released on 1999 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nondestructive Evaluation of Adhesive Bonds written by Vinod K. Nair and published by . This book was released on 1991 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of Nonlinear Ultrasonics for Non destructive Evaluation of Adhesive Joints written by Melody Anne Drewry and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasonic testing remains the most common Non-Destructive Evaluation (NDE) technique for inspecting adhesive joints at the bond line as it can be targeted at small volume elements of interest. Whilst it can detect finite thickness disbonds, there is still no known NDE technique to detect kissing bonds (KB) and therefore assess the integrity of the bond. The literature describes the potential of non linear ultrasonic techniques, but previous work has failed to fully quantify nonlinearities generated by the experimental system. In this thesis, a new prediction tool that provides realistic simulations of nonlinear ultrasonic wave propagation is introduced to assess the detectability of KB in multi-layered structures. A series of experiments that quantify nonlinearities generated by the different sources are described, and a finite-element (FE) model in which the experimental data is incorporated is developed. This new prediction tool is expected to enable NDE engineers to know whether KB are at all detectable in a given adhesive joint, and if so, what experimental set-up, driving frequency and post-processing method to use in order to optimise KB detection capability.

Download or read book Numerical Simulation of Ultrasonic Nondestructive Evaluation of Adhesive Bond Integrity written by Yiping Geng and published by . This book was released on 1991 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Role of Transient Spectrum and Damping Analysis in Assessing the Strength of Polymeric Adhesive Metal Bonding written by G. J. Curtis and published by . This book was released on 1975 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the derivation of an acoustic impact testing facility and some results that have been obtained using it. The primary task has been to examine what acoustic phenomena associated with the response to impact of an adhesively bonded joint relate to the strength of the joint. A 'first look' system employing a 40 microsec. contact time impactor, a broadband polymeric foil transducer and a PDP8/I on-line computer has been used to identify the parameters of interest and the most efficient analysis scheme. This system accesses data at rates up to 4MHz with a data block size of 256, 10 bit words thus specifying the frequency interval between points in the computed frequency spectrum as (sampling frequency/256). The analysis has centered around the computation of the fast Fourier transform of the impact response to obtain frequency response spectra and damping information. Initial results using the 'first look' system have shown that the presence of artificial defects in rectangular bars can be detected. For adhesively bonded joints, results suggest that damping analysis may be useful in assessing glue line porosity, whereas modal frequency shift is sensitive to cohesive strength.

Download or read book Nondestructive Evaluation of Adhesive Bond Thickness Using Infrared Thermography written by Rae L. Limerick and published by . This book was released on 2003 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NDE Nondestructive Evaluation of Adhesive Bonds Phase 1 written by Cecil M. Teller and published by . This book was released on 1987 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of a successful effort to demonstrate the feasibility of using leaky Lamb waves to detect and delineate flaws in the bond surface of metal/rubber laminates, even when adherends remain in intimate contact. It is shown that the leaky Lamb wave method can detect and image a poorly bonded surface when conventional pulse-echo method failed even to detect the flaw. A new technique was implemented for preparing partially bonded surfaces by varying the percentage of adhesive coverage, and results are provided that illustrate the sensitivity of the leaky Lamb wave method in detecting different surfaces prepared by this technique. An analytical model of the leaky Lamb wave phenomenon in homogenous, isotropic metal/rubber laminates is described. Numerical results for a metal/rubber laminate immersed in water are included.

Download or read book Nondestructive Evaluation of Adhesive Bond Quality State of the Art Review written by and published by . This book was released on 1989 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: This state-of-the-art report describes the bonding process, the destructive methods used to measure bond strength, and the various NDE methods that have been evaluated for determining the quality of a bond. These NDE methods include sonics, ultrasonics, acoustic emission, nuclear magnetic resonance, x-ray and neutron radiography, optical holography, and thermography. Each of these methods has shown some limited success in detecting debond conditions. At the present time, however, it appears that only the sonic, ultrasonic, and nuclear magnetic resonance methods have the potential capability to differentiate qualitatively the gradations between a good bond and a debond and thus provide a correlation to bond strength. Nondestructive testing; Adhesive bonds; Adhesive bond testing; Adhesive bond strength; Sonic testing; Ultrasonic testing.