Searched for: mods_originInfo_publisher_s%3A%22Procurement%255C+Executive%252C%255C+Ministry%255C+of%255C+Defence%252C%255C+Royal%255C+Aircraft%255C+Establishment%252C%255C+RAE%255C+Farnborough%22
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Sutton, G.R. (author), Thomas, C.E. (author), Wheeler, C. (author), Wilson, R.N. (author)The feasibility of conducting R-curve tests on centre crack test pieces with length/width ratios below 1.5 has been investigated. To allow for the undefined mixed mode loading present with short, wide test pieces, two experimental methods of determining the geometrie correction for the stress intensity factor have been proposed and compared. An...report 1991
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Kemp, R.M.J. (author)The phenomenon of fatigue crack closure is now recognised as one of the most influential mechanisms operating during fatigue. This literature survey traces the development of research into fatigue crack closure and has been divided to present the two major approaches. The first part covers early work carried out between 1970 to 1980 which,...report 1990
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Cardwell, S.P. (author), Wilson, R.N. (author)The effect of pre-exposure to salt fog upon the subsequent air fatigue strength of an AI-Cu-Mg alloy, BSL93 has been determined. Two aged conditions of the alloy plate have been examined: the as-received, stretched and naturally aged alloy and the material fully aged to the BSL93 specification. Long transverse round bar test pieces were axially...report 1989
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Rooke, D.P. (author), Edwards, P.R. (author)The magnitudes am directions of the frictional forces must be considered in any fracture mechanics analysis of crack growth under fretting fatigue conditions. A simple nonlinear friction model has been developed which relates the waveforms of the frictional forces to those of the applied forces when fretting occurs. It is shown that the...report 1987
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Rooke, D.P. (author), Man, K.W. (author), Zeiher, N.A. (author), Davies, I. (author)Crack-line Green's functions are obtained for cracks in various twodimensional configurations. The boundary element method, coupled with a singular field model of the crack tip, has been used to solve the initial elasticity problem. The Green's functions can be used to obtain the stress intensity factors for cracks in arbitrary stress fields...report 1987
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Ward-Close, C.M. (author)A study has been made of the fatigue crack growth and crack closure behaviour of the alpha/beta titanium alloy Ti-4Al-4Mo-2Sn-0.5Si (IMI 550), following both single and block overloads. A tensile overload was found to re move near crack-tip closure, and slightly reduce far field closure, resulting in an initial acceleration of baseline fatigue...report 1986
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Rooke, D.P. (author), Tweed, J. (author)Stress intensity factors have been derived for periodically distributed radial cracks in rotating discs; both internal and edge cracks have been studied. It is shown that in general as the number of cracks increases, there is a shielding effect which lowers the stress intensity factors.report 1985
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Prior, A.M. (author), Rooke, D.P. (author), Cartwright, D.J. (author)The compounding method enables stress intensity factors to be evaluated for complex geometrical configurations using the known results of simpIer ancillary configurations. Implementation of the method on a computer system requires that a data file of known results be available, and that a program be written to compound solutions from that data...report 1985
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Kemp, R.M.J. (author)Axial fatigue streng th tests at a frequency of 15 Hz and minimum: maximum stress ratio R = 0.1 have been made on the AI-Zn-Mg-Cu-Zr alloy 7010 in temper conditions -T7651 (DTD 5120); -T7451 (DTD 5130) and -T7351. The effect of a 3.5% salt fog environment on fatigue strength has been studied, and the results compared with data from earlier tests...report 1985
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- King-Hele, D.G. (author), Walker, D.M.C. (author) report 1985
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Walker, D.M.C. (author)The orbit of 1970-47B passed very slowly through 14th-order resonance, and the changes in orbital inclination and eccentricity have been analysed over a four-year period, from January 1977 to January 1981, using 208 US Navy orbits. The analysis has yielded values for three pairs of lumped harmonic coefficients of 14th order, which have...report 1985
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Ward-Close, C.M. (author), McDarmaid, D.S. (author)FALSTAFF fatigue lives for pre-cracked SEN test pieces have been compared with computer predicted lives based on constant.amplitude fatigue. With one exception, the predictions were accurate within 8% of the measured lives, and were unconservative. The mechanisms of simulated flight fatigue crack growth in this steel are discussed, and compared...report 1985
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King-Hele, D.G. (author)The satellite 1967-11G which had an orbital inclination of 40°, passed through 14th-order resonance with the Earth's gravitational field in 1974. The changes in its orbital inclination at resonance have been analysed to obtain values for four lumped 14th-order harmonies in the geopotential, with accuracies equivalent to about 5 cm in geoid...report 1985
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Smith, C.J.E. (author), Hewins, M.A.H. (author)Rotating bending fatigue tests have established that glass bead and alumina grit blasting have only a slight effect on the fatigue properties of 2014-T6 aluminium alloy. Exposure to salt fog for 8 hours or alternate immersion in 3½% salt solution for 3 days reduces the fatigue strength from 170 MPa to 107 MPa and 64 MPa respectively but...report 1984
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Eastabrook, N. (author), Wheeler, C. (author), Sutton, G.R. (author)Elastic and plastic deformations of loaded test specimens can cause small errors when measuring crack length by the electrical potential method. Experiments and calculations were undertaken to estimate these errors for a centre-notched specimen. The correct ion has two terrns, one proportional to the plastic crack tip opening displacement (CTOD)...report 1984
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Edwards, P.R. (author), Darts, J. (author)Helix and Felix are standard loading sequences which relate to the main rotors of helicopters with articulated and semi-rigid rotors respectively. The purpose of the loading standards is, first, to provide a convenient tool for providing fatigue data under realistic loading, which can immediately be compared with data obtained by other...report 1984
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Man, K.W. (author)The growth of cracks under constant amplitude sinusoidal fatigue loads was measured for 3L65 aluminium alloy structural specimens in which a crack was initiated in a flange and grew into a larger sectioned boom. Crack growth data in the same material was obtained using centre-notched coupon specimens. These data together with the earl ier crack...report 1984
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Holford, D.M. (author), Sturgeon, J.R. (author)A philosophy of operational data acquisition, for structural objectives, within the general field of in-flight load measurement is reviewed, highlighting the constraints such activities place on the data acquisition system. This Report describes one such system which can be tailored to perform a variety of tasks ranging from the collection of...report 1984
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King-Hele, D.G. (author), Walker, D.M.C. (author)The analysis of variations in satellite orbits when they pass through 15th-order resonance (15 revolutions per day) yields values of lumped geopotential harmonies of order 15, and sometimes of order 30. The 15th-order lumped harmonies obtained from 24 such analyses over a wide range of orbital inclinations are used here to determine individual...report 1984
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Rooke, D.P. (author)The compounding methods for calculating stress intensity factors for complex geometrical configurations are re-examined. It is shown that techniques which were developed specifically for problems involving localized loads, eg a pin-loaded hole with a crack at its edge, can also be used when the loading is remote from the crack. When this is done...report 1984
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