Measurement of wood pole strength-Polux/sup (R)/ a new nondestructive inspection method

2002 ◽  
Author(s):  
E. Ezer
Keyword(s):  
Nondestructive Inspection ◽  
Inspection Method ◽  
Pole Strength

Nondestructive Inspection Methods for Railroad Castings

2010 ◽  
Author(s):  
Daniel Carter ◽  
Kari Gonzales
Keyword(s):  
Magnetic Particle ◽  
Phased Array ◽  
Field Tests ◽  
Ultrasonic Pulse ◽  
Nondestructive Inspection ◽  
Inspection Method ◽  
Technology Center ◽  
Pulse Echo ◽  
Inspection Techniques

Transportation Technology Center, Inc. (TTCI) has investigated various nondestructive inspection (NDI) methods to determine if they are capable of reliably inspecting side frames, bolsters, knuckles, and couplers. The NDI methods used for this investigation include dry and wet (fluorescent) magnetic particle, liquid penetrant, alcohol wipe, visual, ultrasonic (pulse-echo and phased array), and radiography. Inspection results from all methods were used to determine which methods produced repeatable results. From the initial inspection analysis, TTCI engineers determined that the magnetic particle inspection method is the most capable for detecting defects in railroad castings. Further investigation of the magnetic particle technique was completed to develop reliable inspection methods for use on bolsters, side frames, knuckles, and couplers. Each of the inspection techniques have been used for inspections in the field. Using the results of the field tests, procedures were developed by TTCI and submitted to the Association of American Railroads’ (AAR) Coupling Systems and Truck Castings Committee for review and implementation. The inspection procedures can be used by manufacturers, railroads, and car repair shops. Limitations of the inspection procedures include the amount of time necessary to perform the inspection and the reliability of detecting certain types of defects below the surface of the casting. Although these limitations exist, the procedures developed by TTCI are expected to improve the quality of in-service castings and reduce the number of train partings and derailments due to broken or cracked components.

scholarly journals Nondestructive Inspection Method for Jet Engine Turbine Blades

1973 ◽  
Author(s):  
I. R. Kraska ◽  
W. L. Berndt
Keyword(s):  
Air Force ◽  
Eddy Current ◽  
Turbine Blades ◽  
Nondestructive Inspection ◽  
Inspection Method ◽  
Jet Engine ◽  
One Stage ◽  
Trailing Edges ◽  
Depot Maintenance ◽  
Edge Cracks

Nondestructive inspection of jet engine turbine blades during field and depot maintenance is accomplished normally with fluorescent penetrant and/or visual techniques. In spite of the widespread use of the penetrant process, it has many disadvantages as a maintenance inspection method. The reliability of penetrant inspection depends upon the preparation of the blades prior to actual penetrant processing and the inspector’s skill in detecting and evaluating defect indications. The process can miss cracks if they are filled with material that blocks the penetrant from entering the defect. An eddy current technique which can detect leading and trailing edge cracks in turbine blades and an instrument based upon this technique were developed under Air Force sponsorship. The instrument has been tested in a rework facility and field maintenance. Results of the evaluation and photomicrographs of typical cracks detected in turbine blades are presented. Results are compared, in some instances, to results obtained with the fluorescent penetrant and/or visual examinations. A field penetrant inspection of leading trailing edges detect cracks at an inspection rate of one stage in 1 hr and 50 min.

Study on Nondestructive Inspection Method of Single-Lap Adhesive Joints to Eliminate the Influence of Inspector's Behavioral Characteristics

2018 ◽  
Vol 774 ◽  
pp. 283-288
Author(s):  
Genj Hotta ◽  
Yoshifumi Ohbuchi ◽  
Hidetoshi Sakamoto
Keyword(s):  
Adhesive Strength ◽  
Adhesive Joint ◽  
Shear Test ◽  
Nondestructive Inspection ◽  
Behavioral Characteristics ◽  
Tensile Shear ◽  
Cohesive Failure ◽  
Inspection Method ◽  
Adhesive Effect ◽  
The Relationship

In this study, we conducted a tensile shear test according to JIS K 6850 for a simple superposed adhesive joint, and as a result, it was found that the expected adhesive strength can be obtained only when cohesive failure occurs. The surface enlarged length was measured from a micrograph that observes the surface texture of the boundary between the adhesive and the adherents, and it was found that cohesive failure occurred when the length was longer than a certain length. Surface enlarged length is a new way of thinking. It measures the length of the ridgeline of the unevenness in the microscopic photograph of the surface roughness. By doing so, we can quantitatively determine the effective adhesive length. Effective adhesion length is the length of adhesion of the adhesive as viewed microscopically. We can know the adhesive effect by examining the effective adhesive length. Therefore, we found the relationship between the surface enlarged length (= effective adhesion length) of the bonding interface of the simple superposed adhesive joint and the adhesive strength. Then, it was verified whether adhesion strength could be predicted by setting the standard surface enlarged length as a threshold. As a result, we developed a nondestructive inspection method that can estimate the failure mode after the tensile test.

Nondestructive Detection of Cracks in Ceramics Using Vicinal Illumination

1999 ◽  
Author(s):  
Scott M. Hull
Keyword(s):  
Space Flight ◽  
Crack Detection ◽  
Scattered Light ◽  
Ultrasonic Inspection ◽  
Ceramic Materials ◽  
Nondestructive Inspection ◽  
Dark Field ◽  
Inspection Method ◽  
Field Equipment ◽  
Flight Hardware

Abstract Cracks and other defects in ceramic materials can be difficult or impossible to examine and photograph due to the extreme lack of contrast. A method for inspecting translucent ceramics using scattered light, also known as vicinal illumination, will be described. This method has been known in the ceramics industry for quite some time, but is not well known in the testing and failure analysis community. Electronics applications include substrates, packages, multilayer capacitors, and thin film resistors. Ceramic materials are used in electronic applications as microcircuit packages and substrates which carry signals and power between microcircuits. Fine cracks in ceramic materials can result in mechanical failures, electrical failures, and loss of hermeticity. Often, fine cracks are difficult or impossible to detect using standard nondestructive inspection techniques such as visual inspection, ultrasonic inspection, or vapor crack detection. Dye penetrant inspection is usually effective, but contaminates the part, which is unacceptable for space flight hardware. One effective nondestructive inspection method of detecting cracks involves examining the way in which light scatters through the ceramic material when viewed with a standard bright field reflected light microscope. This method, termed vicinal illumination, has been used for detecting cracks during failure analyses of several part types, and screening of space flight hardware. The technique has proven effective on several different types of ceramic materials as well. A related method for use with dark field equipment has also been used to successfully locate otherwise invisible cracks.

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