IN aircraft construction, until about fifteen years ago, the customary static method of stressing generally also provided for an adequate fatigue strength. This does not now apply…
Abstract
IN aircraft construction, until about fifteen years ago, the customary static method of stressing generally also provided for an adequate fatigue strength. This does not now apply for various reasons (e.g. increased flight speeds, use of high‐strength materials with changed fatigue properties). It is, therefore, necessary to establish design rules which take account of more recent knowledge; which variables are to be specially considered, and what their importance is in a particular case, becomes clear from fatigue tests which, to a considerable extent, cater for the peculiar loading conditions of flight (service endurance tests or programme‐loading tests). The principle of these tests was established in the DVL (1938 to 1941) and it is now in general use in automobile design for determining the relation between fatigue strength and endurance (life function) as in many cases of service failures a very good agreement with these tests can be observed.
IN this issue we publish a translation (by MR TIBOR HAAS, whom readers will remember as the author of the paper ‘Fatigue Tests and Aircraft Life Evaluation’ in our October 1955…
Abstract
IN this issue we publish a translation (by MR TIBOR HAAS, whom readers will remember as the author of the paper ‘Fatigue Tests and Aircraft Life Evaluation’ in our October 1955 issue) of a paper by a distinguished German specialist in the study of fatigue. DR ING. E. GASSNER. We feel that this is a contribution of considerable importance, backed as it is by nearly twenty years of experimental and analytical experience of fatigue problems. Sonic of the points have been voiced before in this country, but this paper brings together the reasons which have made fatigue such a serious factor of ignorance in aircraft design since the war.
THE method used at present in fatigue testing aircraft joints and components by applying cycles of constant stress amplitude of a magnitude considered to be the most damaging is…
Abstract
THE method used at present in fatigue testing aircraft joints and components by applying cycles of constant stress amplitude of a magnitude considered to be the most damaging is based on the assumption that Miner's cumulative damage rule, Σ(n/N)&equals l, holds good. This rule is known to be true only under certain conditions which may not apply to those under which fatigue damage is accumulated in aircraft.
Adel Elsayed and Roger Hartley
Learning can be viewed as a communication process that puts the learner in contact with concepts created by others. A result of communication is that an act of interpretation…
Abstract
Learning can be viewed as a communication process that puts the learner in contact with concepts created by others. A result of communication is that an act of interpretation starts, which invokes a process of conceptualization. According to Mayes, successful conceptualization will need the support of learning activities. Hence, machine mediated communication is important for creating online e‐Learning opportunities; not only for relaying communication content, but also for supporting the cognitive processes associated with the necessary learning activities required for conceptualization. In Laurillard’s conversational theory, a communication loop should be established between learners and teachers. The articulation element in this loop is necessary for engaging the learner in a collaborative activity, which is essential for developing further the conceptualization process. This paper discusses the acts of communication, conceptualization and articulation within a machine mediated multimodal communication, and it proposes a framework within which a supporting set of cognitive activities can be developed.
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APPLICATIONS for the loan of copies of translations mentioned below should be addressed to the Secretary (R.T.P.3), Ministry of Aircraft Production, and copies mill be loaned as…
Abstract
APPLICATIONS for the loan of copies of translations mentioned below should be addressed to the Secretary (R.T.P.3), Ministry of Aircraft Production, and copies mill be loaned as far as availability of stocks permits. Suggestions concerning nzw translations will be considered in relation to general interest and facilities available. Lists of selected translations have appeared in AIRCRAFT ENGINEERING since September, 1938.
IN our report of the tenth annual meeting of the Institute of the Aeronautical Sciences we shall not follow precisely the order in which the sessions occurred nor at all times…
Abstract
IN our report of the tenth annual meeting of the Institute of the Aeronautical Sciences we shall not follow precisely the order in which the sessions occurred nor at all times classify the papers in exactly the manner of the meeting. Unfortunately, certain of the papers presented will not be found in our review owing to lack of preprints, but this in no way reflects on the value or timeliness of the papers omitted in the review.
Historically, libraries have always included special features in their catalogs to meet local needs. This trend has changed over the years as cataloging standards have been…
Abstract
Historically, libraries have always included special features in their catalogs to meet local needs. This trend has changed over the years as cataloging standards have been developed and accepted. The sheer volume of materials and the rising costs of operations have also curtailed the customizing of local records. However, the desirability of enhancing local records has been readdressed at Carnegie Mellon University. It has undertaken an experimental project to enhance catalog records for new books that meet defined criteria: for example, the books contain “citable” references in the table of contents; chapter titles, while not separately citable, do contain additional useful information; and exhibition catalogs cover 25 or fewer artists. The criteria for and process of enhancing records are discussed, and sample screen displays are illustrated.
IN 1968, Dowry Rotol Ltd., Staverton, Gloucester, were awarded a contract by McDonnell Douglas Corporation to implement a surface stress survey on the DC‐10 Nose Undercarriage…
Abstract
IN 1968, Dowry Rotol Ltd., Staverton, Gloucester, were awarded a contract by McDonnell Douglas Corporation to implement a surface stress survey on the DC‐10 Nose Undercarriage Assembly.
In a vehicle power plant comprising a pair of coaxial controllable‐pitch propellers and means for rotating said propellers independently in opposite directions, means for holding…
Abstract
In a vehicle power plant comprising a pair of coaxial controllable‐pitch propellers and means for rotating said propellers independently in opposite directions, means for holding one of said propellers against rotation, and means for turning the blades of the propeller so held to a pitch position at which aerodynamic forces acting on said propeller during flight tend to turn said propeller in the same direction as the direction of rotation of the other propeller.
THIS Conference, the largest ever arranged on the subject of fatigue of metals, was sponsored by The Institution of Mechanical Engineers in co‐operation with The American Society…
Abstract
THIS Conference, the largest ever arranged on the subject of fatigue of metals, was sponsored by The Institution of Mechanical Engineers in co‐operation with The American Society of Mechanical Engineers. A follow‐up Conference of the A.S.M.E. was to be held in New York from November 28–30.