TAILIEUCHUNG - High Cycle Fatigue: A Mechanics of Materials Perspective part 3

High Cycle Fatigue: A Mechanics of Materials Perspective part 3. The nomenclature used in this book may differ somewhat from what is considered standard or common usage. In such instances, this has been noted in a footnote. Additionally, units of measurement are not standard in many cases. While technical publications typically adhere to SI units these days, much of the work published by the engine manufacturers in the United States is presented using English units (pounds, inches, for example), because these are the units used as standard practice in that industry. The graphs and calculations came in those units and no attempt was made to convert. | 6 Introduction and Background The Engine Structural Integrity Program ENSIP handbook MIL-HDBK-1783A dated 22 Mar 99 is used as a guide to design develop produce and sustain engines to assure their structure eliminates or minimizes safety reliability and durability problems. Many mechanical electronic and software problems are identified and corrected in the EMD program. At the end of the EMD program a review of the analyses and test reports validates the functional requirements. Two of the challenges of the development program which affect reliability of the field engine are engine to engine tolerances and variations and the required operational usage of the engine. Test time and test hardware are expensive. The limited number of test assets limits the tested tolerances and variations whose characteristics can account for some problems in field operation with the hundreds of engines produced. Secondly the original usage projection of the engine in terms of throttle cycles altitude profiles influences the design. The projected usage is compiled for the engine as a set of component and engine test cycles used to evaluate the product design. Sometimes the pilots fly the system different than the original projection of the usage. This can result in a more severe operation of the engine and affect different component failure modes in the engine. Modeling simulation and analysis improvements and application throughout the weapon system life cycle will hopefully limit these two problems. Once the engine goes into production for a production aircraft installation or as a spare engine it is released for field service evaluation. Sometimes a field service evaluation is performed on the aircraft engine combination in which case it is an initial operational test and evaluation. Usually a small group of aircraft and spare engines are used perhaps 6 aircraft engines and 2 spare engines. The length of the evaluation might be 1-2 years. In this time the engines might each accrue .

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