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Machine-Level Case Study: Fingerprint of Industrial Motors
Published in Pedro Larrañaga, David Atienza, Javier Diaz-Rozo, Alberto Ogbechie, Carlos Puerto-Santana, Concha Bielza, Industrial Applications of Machine Learning, 2019
Pedro Larrañaga, David Atienza, Javier Diaz-Rozo, Alberto Ogbechie, Carlos Puerto-Santana, Concha Bielza
To model component reliability, evidence of behavior has to be gathered. Traditionally, destructive testing has been used to measure material strength under service conditions. However, testing is conducted under controlled conditions. This could bypass specific operating conditions and have serious effects on performance. For example, servomotors are selected from catalogs based on expected conditions generally sourced from information gathered during the design phase, when nominal and maximum conditions are defined. At this stage, it is impossible to precisely estimate real operating conditions under random circumstances. Hence, the servomotor may have to operate outside the nominal region described in commercial catalogs. If operating conditions are outside nominal values for long periods of time, premature degradation might occur, reducing machine utilization.
Introduction to Textile Testing
Published in Sheraz Ahmad, Abher Rasheed, Ali Afzal, Faheem Ahmad, Advanced Textile Testing Techniques, 2017
Sheraz Ahmad, Abher Rasheed, Ali Afzal, Faheem Ahmad
Textile testing can be classified according to the basic technique used and on the basis of the data obtained. The former can be divided into destructive and nondestructive testing, the latter being defined as the application of noninvasive methods to reach a conclusion as to the quality of a material, process, or product. In other words, it is inspection or measurement without doing damage to the test specimen. Examples include drape testing and assessment based on the Kawabata evaluation system. Destructive testing is performed to test for failure of the sample. This type of test is much easier to perform and yield precise information and is more simple to understand than nondestructive testing. Examples of destructive testing are tensile testing and tear testing [5–7].
Effectiveness of phased array focused ultrasound and active infrared thermography methods as a nondestructive testing of Ni-WC coating adhesion
Published in Nondestructive Testing and Evaluation, 2019
R. Rachidi, B. Elkihel, F. Delaunois, D. Deschuyteneer
Adhesion is quantified as the tensile strength of an interface between coating and substrate for a coated sample. This parameter is relatively low in the case of coatings produced by flame thermal spray in comparison with other techniques such as high-velocity oxy-fuel and laser cladding techniques [1,2]. In this process, the coating is mechanically bonded to the substrate [3,4]. Several authors [5–7] have reported that substrate/deposit adhesion is the most searched property especially for coatings operating under severe thermal and/or mechanical conditions, where they sometimes tend to peel off during operation. However, an accurate testing is very important. The inspection of adhesion is usually ensured by destructive methods; generally increasing mechanical action is applied until the coating is separated from the substrate. Although the assessment of the state of test object using destructive testing is usually more reliable, the destruction of this object generally makes this type of testing more costly the non-destructive testing. A number of destructive testing methods have been developed to evaluate adhesion and delamination toughness of thermal spray coatings and for other techniques, and are described in several literature works [1,2,8–11]. However, no method meets all requirements. Among the non-destructive testing methods, those using ultrasonic transducers and infrared thermography are interesting in view of the fact that the number of applications in industrial field increases. These methods are used to get accurate information about the physical integrity of metal parts and can be used to inspect a coating-substrate system.