Organization, equipment and operation of the structural-materials testing laboratories at St. Louis, Missouri

Operation of machines and equipment is accompanied by an impact produced by various types of loads leading to fatigue rupture of the structural materials. The most harmful are the vibration loads which in a corrosive environment increase the potential for a failure resulting in human casualties. Therefore, the task of ensuring the operating capability of machine elements and assemblies is one of the outstanding tasks for all industry sectors. In addition, the need for extending the service life and increasing the operational reliability is also determined by a relatively high cost of the machine structural materials and hardware items. Therefore, the execution of the experimental studies of the structural material fatigue features with a view to reduce the metal consumption, to establish new processing methods as well as to select a competitive material, are of the priority for the up-to-date machine building sector. The purpose of this article is to determine any fatigue behavior regularities in automotive materials which were pre-processed according to various technology types and modes and which were operating in a corrosive environment. The experimental data analysis has demonstrated that the longer the cyclic metal materials testing is run, the more sufficient is the decrease of the fatigue resistance of these.

Download Full-text

Temperature Conditions Induced During The Process Of Vulcanization**Tests made in the Materials Testing Laboratories, University of Michigan, College of Dental Surgery.

The Journal of the American Dental Association and The Dental Cosmos ◽

10.14219/jada.archive.1937.0334 ◽

1937 ◽

Vol 24 (11) ◽

pp. 1793-1798

Author(s):

Horton D. Kimball ◽

Floyd A. Peyton

Keyword(s):

Materials Testing ◽

University Of Michigan ◽

Dental Surgery ◽

Testing Laboratories ◽

Temperature Conditions ◽

Made In

Download Full-text

43. Materials Testing Laboratories: The Hidden Hazards

10.3320/1.2758252 ◽

2004 ◽

Author(s):

S. Miller

Keyword(s):

Materials Testing ◽

Testing Laboratories

Download Full-text

Proceedings of the Conference on Accreditation of Construction Materials Testing Laboratories

10.6028/nbs.sp.736 ◽

1987 ◽

Author(s):

James H Pielert ◽

Curtis B Spring

Keyword(s):

Construction Materials ◽

Materials Testing ◽

Testing Laboratories

Download Full-text

Advanced Signal Processing Methods for Inspection of Aircraft Structural Materials

Transactions on Aerospace Research ◽

10.2478/tar-2020-0008 ◽

2020 ◽

Vol 2020 (2) ◽

pp. 27-35

Author(s):

Iuliia Lysenko ◽

Volodymyr Eremenko ◽

Yurii Kuts ◽

Anatoliy Protasov ◽

Valentin Uchanin

Keyword(s):

Signal Processing ◽

Phase Measurement ◽

Ultrasonic Attenuation ◽

Flaw Detection ◽

Structural Materials ◽

Thickness Measurement ◽

Materials Testing ◽

Discrete Hilbert Transform ◽

High Durability ◽

The Time Domain

AbstractAircraft, their assemblies, and units must provide high durability and reliability, and maintain mechanical and technological characteristics throughout the life span of the aircraft. Different elements of aircraft structures work under mechanical loads, over a wide temperature range, with varying degrees of exposure to corrosive environments. Aircraft structural materials have a variation in the characteristics values and require the various testing methods for their inspection.In many NDT methods applied in aviation materials testing, signals that could be represented by a narrowband processes model are used. Known methods of their processing are focused on determining and analyzing the signals amplitude characteristics, but the information resource contained in phase characteristics is not used.In the article, the methodology for signal processing and determining phase characteristics in the time domain are discussed. It is based on the combination of the discrete Hilbert transform and the deterministic and statistical methods of the phase measurement. There are given examples of the application of the methodology for pulsed eddy current testing of electrically conductive materials and products, ultrasonic thickness measurement of products made of materials have significant ultrasonic attenuation, the realization impulse variant of acoustic impedance flaw detection of products made of composite materials. The examples have shown that the proposed signal processing methodology enables to determine new information parameters and signal characteristics for the industry, and extend the scope of known NDT methods.

Download Full-text