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Crack initiation and propagation under fretting fatigue of inconel 600 alloy
정한규,권재도,이춘열 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.12
The purpose of the study is to experimentally investigate the fatigue crack initiation and propagation characteristics of nuclear powerplant steam generator tube materials, Inconel 600 alloy, under fretting fatigue conditions. In addition, this study aims to enhance theoverall reliability of nuclear power plant equipments by developing fretting fatigue life and integrity evaluation methods. In order toachieve these purposes, a fretting fatigue experiment apparatus is developed and fatigue crack growth experiments are conducted toevaluate the characteristics of Inconel 600 alloy under various stress conditions. Finally, microstructures are observed in accordance withfretting fatigue and contact pressure conditions and fretting fatigue crack initiation mechanism is examined.
鄭漢珪 成均館大學校 韓國産業硏究所 1987 韓國經濟 Vol.14 No.-
The purpose of this study is to discuss the finanial considerations in mergers and acquisitions. A company may grow internally, or it may grow externally through mergers. The objective of the firm in either case should be to maximizs exisiting shareholder wealth. Another comapny can be acquired through the purchase of either its assets or its stock. in turn, the means of payment can be cash, or it can be stock. When two companies combine and one loses its corporate existence, the combination is known as a merger;if two companies combine and form a new corporation, the combination is known as a consolidation. There are a number of reasons for acquiring another company, all of which relate to expected return and risk. Among the more important are operating ecconomics, economics od scale, acquisition of management, diversification, growth potential, and personal motives of the owners, In cases where the acquiring company does not wisj to negotiate with the management of the prospective company, it can make a tender offer to purchase shares directly from the stockholders of that company. Whenever there is an exchange of stock between two ompanies financial relationships become important. Many companies focus on the impact on earnings per share. When the price/earnings ratio of the company being acquired is lower than the price/earnings ratio of the company, there is an initial improvement in earnings per share of the latter comapny ; a dilution occurs when the price/earnings ratio is higher. Instead of looking only at the effect on initial earnings per share, it is desirable to look at the effect on expected future earnings per share as well. In efficient financial markets and in the absence of synergism, we would expect the price/earnings ratio of the surviving company to be a weighted average of the price/earnings ratio of the two premerger companies. For the most part, wealth cannot be created simply by merging with companies with low price/earnings ratios. The basic economic foundation for mergers is the cash flows expected to be realized with the fusion of two companies, together with the incremental impact on systematic risk of the combined entity.