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  • 1
    Electronic Resource
    Electronic Resource
    Spectral Theory of Diffraction (1976)
    Springer
    Applied physics 10 (1976), S. 1-13 
    Details
    ISSN: 1432-0630
    Keywords: 84 ; 42 ; 10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In this paper we present an overview of the spectral domain approach for solving a variety of high frequency diffraction problems. We demonstrate via a number of examples that the fields derived from the use of the Spectral Theory of Diffraction (STD) remain uniformly valid for all observation angles, including the shadow boundary, the reflection boundary and the caustic direction where the conventional Geometrical Theory of Diffraction (GTD) breaks down. Furthermore, we show how the accuracy of STD can be improved and its range extended by combining it with integral equation methods in the spectral domain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00929524
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Plastic zones surrounding a hemispherical surface inclusion under remote arbitrary uniform tractions (1975)
    Springer
    International journal of fracture 11 (1975), S. 1066-1069 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033859
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    Paper (German National Licenses)
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  • 3
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    Spectral Theory of Diffraction (1976)
    Springer
    Details
    Publication Date: 1976-05-01
    Print ISSN: 0340-3793
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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    PAPER CURRENT
  • 4
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    An orthotropic sandwich plate containing a part-through crack under mixed mode deformation (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Keywords: STRUCTURAL MECHANICS
    Type: Engineering Fracture Mechanics; 10; 1, 19; 1978
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Mode I fracture behavior of nonlinear materials (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A finite element analysis is presented for the Mode I fracture behavior of cracked plates (stationary crack) made of different nonlinear materials (elastoplastic or elastic locking). The assumed stress-strain behavior of the nonlinear materials was piecewise linear. For each given 'stationary' crack size, the corresponding critical remote tensile stress was calculated based on the maximum crack-tip stress failure criterion. It was found that in the log-log plots of the critical remote stress versus critical crack length, the fracture data of the piecewise linear materials obey a 'stepwise-linear-inverse-square-root' fracture law. It is also shown how the fracture data of the piecewise linear materials can be fitted by proper piecewise graphical shifting of the classical 'inverse-square-root' fracture curve for the linearly elastic materials.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Fracture; 16; June 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Finite element microscopic stress analysis of cracked composite systems (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: This paper considers the stress concentration problems of two types of cracked composite systems: (1) a composite system with a broken fiber (a penny-shaped crack problem), and (2) a composite system with a cracked matrix (an annular crack problem). The cracked composite systems are modeled with triangular and trapezoidal ring finite elements. Using NASTRAN (NASA Structural Analysis) finite element computer program, the stress and deformation fields in the cracked composite systems are calculated. The effect of fiber-matrix material combination on the stress concentrations and on the crack opening displacements is studied.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Composite Materials; 12; Jan. 197
    Format: text
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  • 7
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    Solution of electromagnetic scattering and radiation problems using a spectral domain approach - A review (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: This paper presents a brief review of some recent developments on the use of the spectral-domain approach for deriving high-frequency solutions to electromagnetics scattering and radiation problems. The spectral approach is not only useful for interpreting the well-known Keller formulas based on the geometrical theory of diffraction (GTD), it can also be employed for verifying the accuracy of GTD and other asymptotic solutions and systematically improving the results when such improvements are needed. The problem of plane wave diffraction by a finite screen or a strip is presented as an example of the application of the spectral-domain approach.
    Keywords: PHYSICS (GENERAL)
    Type: Wave Motion; 1; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Effect of crack size on the natural frequencies of a cracked plate (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Results are presented for a finite element modal analysis of a centrally cracked rectangular plate made of linearly elastic material. The objective is to assess the effect of crack size on the natural vibration frequencies of the cracked plate. Only the in-plane vibration modes are studied. The results presented are finite-element mesh-size dependent. Namely, shrinking the mesh size, especially in the crack tip region, would change the magnitudes of the natural frequencies, and the trends would be the same as shown in the present note.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Fracture; 14; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Stress concentration around a small circular hole in the HiMAT composite plate (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Anisotropic plate theory is used to calculate the anisotropic stress concentration factors for a composite plate (AS/3501-5 graphite/epoxy composite, single ply or laminated) containing a circular hole. This composite material is used on the highly maneuverable aircraft technology (HiMAT) vehicle. It is found that the anisotropic stress concentration factor could be greater or less than 3 (the stress concentration factor for isotropic materials), and that the locations of the maximum tangential stress points could shift with the change of fiber orientation with respect to the loading axis. The effect of hole size on the stress concentration factor is examined using the Point Stress Criterion and the Averaged Stress Criterion. The predicted stress concentration factors based on the two theories compared fairly well with the measured values for the hole size 0.3175 cm (1/8 in). It is also found that through the lamination process, the stress concentration factor could be reduced drastically, indicating an improvement in structural performance.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-TM-86038 , H-1235 , NAS 1.15:86038
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Buckling behavior of Rene 41 tubular panels for a hypersonic aircraft wing (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The buckling characteristics of Rene 41 tubular panels for a hypersonic aircraft wing were investigated. The panels were repeatedly tested for buckling characteristics using a hypersonic wing test structure and a universal tension/compression testing machine. The nondestructive buckling tests were carried out under different combined load conditions and in different temperature environments. The force/stiffness technique was used to determine the buckling loads of the panels. In spite of some data scattering resulting from large extrapolations of the data-fitting curve (because of the termination of applied loads at relatively low percentages of the buckling loads), the overall test data correlate fairly well with theoretically predicted buckling interaction curves. Also, the structural efficiency of the tubular panels was found to be slightly higher than that of beaded panels.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 86-0978
    Format: text
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    NASA TECHNICAL REPORTS
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