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Failure analysis of some orthopedic implants

Holt, R.T. (author), Wallace, W. (author)

The latest information indicates that over 2500 orthopedic implant malfunctions may occur each year in Canada. Several orthopedic implants which failed in service have been examined in the Structures and Materials Laboratory, National Aeronautical Establishment, National Research Council of Canada. Two classes of material were studied, wrought...

report 1980

document

The nae model of the highway cable barrier for parametric studies of vehicle redirection using digital simulation

Pinkney, H.F.L. (author), Basso, G.L. (author), Fraser, I.J. (author)

Experimental and analytical studies on the highway cable harrier were initiated in 1968 at the National Aeronautical Establishment. This report describes the basis for these studies and the analytical model of the cable barrier which has been formulated and programmed for digital simulation . The analysis contains a complete description of an...

report 1972

document

The effect of process conditions on tensile properties of a dgeba and phenol novolac resin reacted with an adduct of methylenedianiline and phthalic anhydride

McLean, P.D. (author), Scott, R.F. (author)

The preparation of an anhydride amine adduct from phthalic anhydride and methylenedianiline and its use as a cross-linking agent is presented. The exotherms and cross-linking times (or a variety of reacting compositions have been determined. The results of a study on the effect of process conditions on the tensile strength, elongation, and...

report 1971

document

Cyclic oxidation of Cr-Ti-Si coatings on the niobium alloy B66

Trenouth, J.M. (author), Dainty, R.V. (author)

Cr- Tl-Si diffusion coatings, formed on the niobium alloy 866 by a two cycle vacuum pack cementation process, were evaluated by cyclic oxidation tests at both 1204 and 1371ºC. Coating protection was found to be a function of the thickness of the initial Cr-Ti coating at 1204ºC but independent of thls thickness above a minimum value at 1371º C ....

report 1970

document

An apparatus and procedure for determining cross-linking time and exothermic temperature of reacting plastic compositions

McLean, P.D. (author), Scott, R.F. (author)

An apparatus and procedure is described for determining cross-linking time and exothermic temperatures of reacting plastic compositions. The apparatus consists essentially of an oil bath, insulating flask, double vessels, and temperature-time recording system

report 1970

document

Finite element dynamic analysis of shallow shell structures

Lindberg, G.M. (author), Olson, M.D. (author), Sarazin, A.C. (author)

An efficient dynamic analysis capability for arbitrary shallow shell structures is developed and illustrated with several applications with experimental verifications. The method is based on a compatible, doubly-curved shallow shell element of arbitrary triangular shape which includes thickness variations. This element uses as generalized...

report 1970

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Residual stress analysis in plastically deformed metals of low stacking fault energy

Wallace, W. (author), Terada, T. (author), Grzedzielski, M. (author)

report 1970

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Exothermic temperatures and cross-linking times for some reacting epoxy plastic compositions

McLean, P.D. (author)

The effect on the cross-linking time and exothermic temperature of varying the cure temperature and the proportions of the reacting epoxy plastic compositions is described. The reactions of the anhydride amine adducts were compared with the amines when cross-linked with a variety of diglycidyl ethers of bisphenol-A resins and a polyglycidyl...

report 1970

document

Analysis of flight loads during low-altitude pipeline patrol operations: final report

Sewell, R.T. (author)

This report presents an analysis of 1135 hours data from counting accelerometers installed in three Piper Aztec aircraft employed on pipeline patrol operations in Canada. Flight tests were also made to determine the magnitude of the stresses in the wing main spar over a range of normal acceleratians. The frequency distribution of normal...

report 1969

document

Application of the high precision triangular plate-bending element to problems with curved boundaries

Cowper, G.R. (author), Chernuka, M.W. (author), Lindberg, G.M. (author), Olson, M.D. (author)

The application of the high precision triangular plate-bending element to problems with curved boundaries is considered. Appropriate edge conditions for nodal points on these boundaries are derived. The error inherent in representing a curved boundary by a series of straight segments is found to be the limiting factor on accuracy, while the...

report 1969

document

A high precision triangular plate-bending element

Cowper, G.R. (author), Kosko, E. (author), Lindberg, G.M. (author), Olson, M.D. (author)

A fully conforming, displacement-type, finite element of triangular shape is developed and applied to the solution of several problems in the bending of plates. The deflection is represented by a fifth degree polynomial in the Cartesian co-ordinates of the mid-plane. Six deflection parameters, namely the displacement and its first and second...

report 1968

document

Automatic separation of strain and particle size effects in experimentally observed x-ray line shapes

Wallace, W. (author)

A computer method is described that provides a complete analysis of experimentally observed x-ray line shapes, producing estimates of lattice strain and particle size in a single operation. It is shown that the method produces results comparable with those obtained from the conventional two-stage analysis.

report 1968

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Diffusion of 51Cr into poly- and single crystals of niobium

Pelleg, J. (author), Lindberg, G.M. (author)

report 1968

document

Finite plate-bending elements in polar co-ordinates

Olson, M.D. (author), Lindberg, G.M. (author), Tulloch, H.A. (author)

Two finite elements for plate bending in polar co-ordinates are derived. One element is in the form of a circular sector and the other is in the form of an annular sector. The former element has nine degrees of freedom, while the latter has twelve, the degrees of freedom in each case being a displacement and two slapes at each element corner....

report 1968

document

An investigation of the near noise fields of a choked axisymmetric air jet

Westley, R. (author), Woolley, J.H. (author)

An experimental investigation was completed of the near sound field of a choked axisymmetric air jet of 2.25-in diameter. The results include surveys of tbe sound pres sure levels in the area surrounding the jet and the identification of various screech frequencies. A schlieren system with stroboscopic spark synchronisation was used to...

report 1968

document

Fatigue tests on notched specimens of 2024-T351 aluminium alloy under a low altitude aircraft load spectrum

Dunsby, J.A. (author)

report 1968

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A finite cylindrical shell element and the vibrations of a curved fan blade

Lindberg, G.M. (author), Olson, M.D. (author)

report 1968

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The elastic suspension of a rigid body

Kosko, E. (author)

Met.hods are present.ed for the statical analysis of elastic suspension systems that include extensional springs wit. linear characteristics. The elastic properties of such a suspension are formulated in terms of a matrix of stiffness coefficients. Formulae for these coefficients are derived for an arbitrary three-dimensional arrangement of...

report 1968

document

Interpretation of x-ray powder diffraction patterns from multi-phase materials

Wallace, W. (author)

The problems of interpretation of x-ray powder data from multi-phase materials are discussed. A computer analysis is described to facilitate solution of such problems. In the most successful cases the computer will provide a complete set of reflection indices separated into sub-patterns, and least squares determined lattice parameter values for...

report 1968

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Low altitude flight load spectra for light aircraft

Sewell, R.T. (author)

An analysis is presented of more than 1, 300 hours flight loads records oblained from light aircraft engaged in low altitude terrain-following operations. It is shown that continuous operation in tbe average low attitude environment reduces the estimated fatigue life by a factor of 15 to 1 when compared with thc normal operating environment, and...

report 1967