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  • 1
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    Magnetically induced cylindrical stress waves in a thermoelastic conductor (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The problem of stress wave generation in a linear thermoelastic solid by a pulsed magnetic field is investigated both analytically and experimentally for a cylindrically symmetric conducting solid. A dynamic response analysis is developed to correlate magnetic, thermal, and stress fields in the solid with the time history of the electric current. In the experiment, a transient magnetic field was applied normal to a large conducting plate with a circular hole. Initially the field was confined to the interior of the circular hole. The field was generated by discharging a large capacitor bank through a solenoidal coil. The plane-stress cylindrical stress waves are 1-D in nature. The relative effects of the magnetic body force and thermoelastic stresses, both generated by the electromagnetic field, are assessed.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Solids and Structures; 17; 11, 1; 1981
    Format: text
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  • 2
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    Theoretical analysis of impact in composite plates (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The calculated stresses and displacements induced anisotropic plates by short duration impact forces are presented. The theoretical model attempts to model the response of fiber composite turbine fan blades to impact by foreign objects such as stones and hailstones. In this model the determination of the impact force uses the Hertz impact theory. The plate response treats the laminated blade as an equivalent anisotropic material using a form of Mindlin's theory for crystal plates. The analysis makes use of a computational tool called the fast Fourier transform. Results are presented in the form of stress contour plots in the plane of the plate for various times after impact. Examination of the maximum stresses due to impact versus ply layup angle reveals that the + or - 15 deg layup angle gives lower flexural stresses than 0 deg, + or - 30 deg and + or - 45 deg. cases.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-121110 , AMS-1099
    Format: application/pdf
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  • 3
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    One-dimensional transient waves in anisotropic plates. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The stresses and displacements induced in anisotropic plates by short-duration impact line forces are calculated in this paper. The anisotropy is related to the lay-up angles of the fibers of a laminated fiber composite plate. A modification of Mindlin's theory of crystal plates is used. The plate responses are calculated for various fiber lay-up angles and inclination of the line load to the axes of symmetry. Use is made of the computational method of the fast Fourier transform.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 73-APM-L
    Format: text
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  • 4
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    Wave propagation and impact in composite materials (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Anisotropic waves in composites are considered, taking into account wave speeds, wave surfaces, flexural waves in orthotropic plates, surface waves, edge waves in plates, and waves in coupled composite plates. Aspects of dispersion in composites are discussed, giving attention to pulse propagation and dispersion, dispersion in rods and plates, dispersion in a layered composite, combined material and structural dispersion, continuum theories for composites, and variational methods for periodic composites. The characteristics of attenuation and scattering processes are examined and a description is given of shock waves and impact problems in composites. A number of experiments are also reported.
    Keywords: STRUCTURAL MECHANICS
    Format: text
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  • 5
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    Wave surfaces due to impact on anisotropic fiber composite plates (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Stress waves induced in anisotropic fiber composite plates by transverse, short-duration impact forces
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TN-D-6357 , E-6150
    Format: application/pdf
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  • 6
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    Analysis of edge impact stresses in composite plates (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The in-plane edge impact of composite plates, with or without a protection strip, is investigated. A computational analysis based on the Fast Fourier Transform technique is presented. The particular application of the present method is in the understanding of the foreign object damage problem of composite fan blades. The method is completely general and may be applied to the study of other stress wave propagation problems in a half space. Results indicate that for the protective strip to be effective in reducing impact stresses in the composite the thickness must be equal or greater than the impact contact dimension. Large interface shear stresses at the strip - composite boundary can be induced under impact.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-134720 , AMS-1141
    Format: application/pdf
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  • 7
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    A critical survey of wave propagation and impact in composite materials (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A review of the field of stress waves in composite materials is presented covering the period up to December 1972. The major properties of waves in composites are discussed and a summary is made of the major experimental results in this field. Various theoretical models for analysis of wave propagation in laminated, fiber and particle reinforced composites are surveyed. The anisotropic, dispersive and dissipative properties of stress pulses and shock waves in such materials are reviewed. A review of the behavior of composites under impact loading is presented along with the application of wave propagation concepts to the determination of impact stresses in composite plates.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-121226 , AMS-1103
    Format: application/pdf
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  • 8
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    Stress wave calculations in composite plates using the fast Fourier transform. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The protection of composite turbine fan blades against impact forces has prompted the study of dynamic stresses in composites due to transient loads. The mathematical model treats the laminated plate as an equivalent anisotropic material. The use of Mindlin's approximate theory of crystal plates results in five two-dimensional stress waves. Three of the waves are flexural and two involve in-plane extensional strains. The initial value problem due to a transient distributed transverse force on the plate is solved using Laplace and Fourier transforms. A fast computer program for inverting the two-dimensional Fourier transform is used. Stress contours for various stresses and times after application of load are obtained for a graphite fiber-epoxy matrix composite plate. Results indicate that the points of maximum stress travel along the fiber directions.
    Keywords: STRUCTURAL MECHANICS
    Format: text
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