June 22, 2008
June 22, 2008
June 25, 2008
13.512.1 - 13.512.13
ENGINEERING INSTRUCTION IN NONDESTRUCTIVE TESTING OF MATERIALS (NDT) USING THE CAPILLARY DIFFUSION METHOD
In a great majority of educational cases, “testing of materials” in the laboratory implies “destructive” techniques consisting of using universal testing machines (UTMs), where materials are brought to a “failure condition” under tension, compression, shear, bending or torsion. Common objectives associated with these types of tests are: the evaluation of materials moduli of elasticity and rigidity, yield strength, strain, ultimate strength, etc. In engineering practice, however, “in-situ” nondestructive testing (NDT) of materials are highly preferable, in order to evaluate rapidly the condition, failure potential, usefulness and serviceability of engineering materials. Thus, nondestructive testing of materials ought to be an essential ingredient of engineering education and training, since it plays a significant role in design, manufacturing and evaluation of engineering equipment. This paper presents an inexpensive, simple and effective method to convey to engineering students the underlying principles of NDT, based on an innovative technique referred to as Capillary Diffusion Method (CDM), which is classified within the category of non-destructive Penetrant Testing (PT). CDM is relatively unknown in the United States, but, it has been used for several years in the former Soviet Union, and more recently, in the Russian Federation. CDM proves to be quite versatile and considerably faster than conventional PT techniques used in the U.S. In this paper, the underlying science behind the CDM technique is discussed in detail, as well as, the academic benefits and educational potential derived from the inclusion of CDM in engineering academic curriculum. Mathematical, graphical and numerical documentation are presented in order to substantiate the suitability of CDM as an educational tool to teach Nondestructive Testing in engineering programs such as: Mechanical engineering, Chemical engineering, Civil engineering, Aeronautical, Aerospace engineering, Power Plant Engineering, and Nuclear engineering.
Nondestructive testing and evaluation of materials is an ancient practice. Early metalworkers, for example, report the use of “visual” or “sonic” techniques to determine the quality and usefulness of their products. Today, Nondestructive Testing (NDT) and Nondestructive Evaluation (NDE) are methods of considerable importance to inspect and determine the integrity of engineering materials, equipment and systems. Several engineering techniques have been and continue to be developed for accurate NDT and NDE of materials. Examples of these techniques in engineering applications include: X-rays, Thermography, Ultrasound, Eddy Current, Magnetic Particle, and Penetrant Testing 6,8,12.
Materials Testing is quite likely to be part of engineering lab curricula and training, particularly, in fields such as, Civil, Structural, Mechanical, Power Plant, Nuclear, Aeronautical and Aerospace. Often, however, testing of engineering materials in the laboratory involves “destructive” procedures where standard specimens are brought to the “failure condition” or to the “breaking point”. Familiar destructive tests include tensile, compressive, shear, torsion and fatigue. The most common educational objective from these types of tests is the quantification
Lopez, G., & Leipunsky, I., & Berezkina, N. (2008, June), Engineering Instruction In Nondestructive Testing Of Materials (Ndt) Using The Capillary Diffusion Method. Paper presented at 2008 Annual Conference & Exposition, Pittsburgh, Pennsylvania. https://peer.asee.org/3626
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