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Article
Publication date: 1 July 1955

B.R. Noton

A two‐spar cantilever box beam with forty‐five degrees sweep and oblique ribs placed parallel to the root clamping section was the subject of a series of static tests. Stress and…

79

Abstract

A two‐spar cantilever box beam with forty‐five degrees sweep and oblique ribs placed parallel to the root clamping section was the subject of a series of static tests. Stress and strain distributions were determined, primarily in a region distant from the root and tip disturbances, to permit a stringent comparison with three well‐known swept wing theories and the simple theory of bending. Torsional and flexural stiffnesses were also measured and compared with these theories. The sequence of calculation for each method is presented and it is found that two of the theories provide accurate predictions of the stresses, strains and stiffnesses. The influence of rivet slip and rivet flexibility on the stiffnesses of the box is mentioned. As a secondary aim of the investigation, the distribution of normal and shear strain has been measured in the cover skin and spar webs at the root connexion. The design of swept box examined has been the subject of research in a number of establishments and a review of this other work is included.

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Aircraft Engineering and Aerospace Technology, vol. 27 no. 7
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 December 1953

W.H. Wittrick

A PREVIOUS paper by Mansfield considered the problem of the torsion of a doubly symmetrical rectangular box containing a large number of equidistant identical webs. Mansfield

33

Abstract

A PREVIOUS paper by Mansfield considered the problem of the torsion of a doubly symmetrical rectangular box containing a large number of equidistant identical webs. Mansfield overcame the practical difficulty involved in solving the large number of simultaneous equations by an ingenious approximate method consisting of the replacement of the webs by an equivalent continuous medium. This device resulted in the derivation of a simple differential equation instead of the system of simultaneous equations.

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Aircraft Engineering and Aerospace Technology, vol. 25 no. 12
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 September 1955

E.H. Mansfield and P.W. Kleeman

The stress distribution in triangular cantilever plates under a uniform normal load and under a tip load is investigated theoretically. Numerical solutions are presented for…

104

Abstract

The stress distribution in triangular cantilever plates under a uniform normal load and under a tip load is investigated theoretically. Numerical solutions are presented for plates with angles of sweep from 0 deg. to 60 deg. and with tip angles of 30 deg., 45 deg., 60 deg., 75 deg. and 90 deg.

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Aircraft Engineering and Aerospace Technology, vol. 27 no. 9
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 April 1955

E.H. Mansfield and P.W. Kleeman

This report presents a simplified large‐deflexion theory for thin flat plates subjected to normal loading. The theory is applicable to plates in which the loading is resisted…

90

Abstract

This report presents a simplified large‐deflexion theory for thin flat plates subjected to normal loading. The theory is applicable to plates in which the loading is resisted primarily by the flexural rigidity of the plate. The middle surface of the plate is assumed to be inextensional so that the mode of deformation is a developable surface. There is good agreement with experiment.

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Aircraft Engineering and Aerospace Technology, vol. 27 no. 4
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 April 1953

E.H. Mansfield

Four electrical circuits for adding strain gauge signals in various proportions are considered and their relative efficiencies and sensitivities examined. The addition is effected…

76

Abstract

Four electrical circuits for adding strain gauge signals in various proportions are considered and their relative efficiencies and sensitivities examined. The addition is effected by slight modifications to the Wheatstone bridge circuit. In all cases expressions are given for the galvanometer current, the sensitivity and the magnitude of any extra resisters in the circuit which are necessary to effect the addition; their derivations are given in an appendix.

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Aircraft Engineering and Aerospace Technology, vol. 25 no. 4
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 January 1953

E.H. Mansfield

The determination of the torsional stiffness and shear stresses in a multi‐webbed cylinder is quite straight‐forward. However, if the number of webs is large (say, Ave or more…

35

Abstract

The determination of the torsional stiffness and shear stresses in a multi‐webbed cylinder is quite straight‐forward. However, if the number of webs is large (say, Ave or more) the calculations become tedious. This Note gives a rapid, approximate solution by utilizing the physical conception of spreading the internal webs out into an equivalent uniform web medium.

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Aircraft Engineering and Aerospace Technology, vol. 25 no. 1
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 February 1952

E.H. Mansfield

THE introduction of swept wings for certain high speed aircraft has brought with it a variety of fresh structural problems. The aero‐dynamic requirements of a smooth wing surface…

30

Abstract

THE introduction of swept wings for certain high speed aircraft has brought with it a variety of fresh structural problems. The aero‐dynamic requirements of a smooth wing surface means that the designer must have information on the buckling characteristics of the top skin. If the ribs are parallel to the direction of flight a typical panel of skin will be in the form of a parallelogram, supported on two sides by stringers and on the other two sides by ribs.

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Aircraft Engineering and Aerospace Technology, vol. 24 no. 2
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 September 1952

E.H. Mansfield

The general theory of the clastic behaviour of a conventional single‐cell wing stiffened with swept ribs (or stringers) has been dcvclopcd. It was shown that the swept members…

31

Abstract

The general theory of the clastic behaviour of a conventional single‐cell wing stiffened with swept ribs (or stringers) has been dcvclopcd. It was shown that the swept members introduce a measure of skewness in the structural geometry of the wing which cause the wing to twist, as well as bend, under simple bending loads. This note shows that, if the sweepback angle is not more than 35 deg., it is possible to make a wing aero‐isoclinic by introducing swept stringers.

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Aircraft Engineering and Aerospace Technology, vol. 24 no. 9
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 April 1949

E.H. Mansfield

THE problem of load diffusion from a boom into a stiffened sheet structure has been considered by many writers. The solutions obtained lead to an infinite shear stress at a point…

34

Abstract

THE problem of load diffusion from a boom into a stiffened sheet structure has been considered by many writers. The solutions obtained lead to an infinite shear stress at a point at the free edge of the sheet adjacent to the boom. They are therefore of little practical value in determining the necessary strength of the boom‐to‐sheet connexion.

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Aircraft Engineering and Aerospace Technology, vol. 21 no. 4
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 October 1957

S.L. Kochanski and J.H. Argyris

This paper presents a preliminary analysis of the effects of kinetic healing at supersonic speeds on the torsional and flexural stiffnesses of thin solid wings. The main…

46

Abstract

This paper presents a preliminary analysis of the effects of kinetic healing at supersonic speeds on the torsional and flexural stiffnesses of thin solid wings. The main investigation is based on the small deflexion theory, but the scope of the analysis for torsion is extended to cover the effects of large deformations.

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Aircraft Engineering and Aerospace Technology, vol. 29 no. 10
Type: Research Article
ISSN: 0002-2667

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