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  • General Chemistry  (1,165)
  • STRUCTURAL MECHANICS  (323)
  • Cell & Developmental Biology
  • Humans
  • 1970-1974  (1,677)
  • 1971  (1,677)
Collection
Keywords
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  • 1970-1974  (1,677)
Year
  • 1
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    NASTRAN - A summary of the functions and capabilities of the NASA structural analysis computer system (1971)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Description of general purpose digital computer program /NASTRAN/ for analysis of elastic structures under various loading conditions using finite element method approach
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-260
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Buckling strength of structural plates (1971)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Designs for determining buckling strength of structural plates for spacecraft
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-8068
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Testing methods and techniques: Strength of materials and components. A compilation (1971)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The methods, techniques, and devices used in testing the mechanical properties of various materials are presented. Although metals and metal alloys are featured prominently, some of the items describe tests on a variety of other materials, from concrete to plastics. Many of the tests described are modifications of standard testing procedures, intended either to adapt them to different materials and conditions, or to make them more rapid and accurate. In either case, the approaches presented can result in considerable cost savings and improved quality control. The compilation is presented in two sections. The first deals specifically with material strength testing; the second treats the special category of fracture and fatigue testing.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-5944(01)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A Stability Analysis of Cylindrical Panels Using a Finite Element Formulation (1971)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: A cylindrical finite element suitable for the linear stability analysis of cylindrical shells is developed. Energy principles and variational methods lead to a problem formulation which lends itself to physical interpretations of the governing matrices of the finite element. By properly grouping the terms which result from taking the second variation of the potential energy of the element, it is possible to identify three distinct types of matrices. The first matrix is the conventional stiffness matrix; the second is an initial stress stiffness matrix; and the third is an initial displacement stiffness matrix. With the assumption of linearity, the buckling problem is stated in terms of the classical linear real eigenvalue equation. This problem formulation was programmed on the CDC 6600 series computer. The computer program is used to analyze the buckling of a variety of structures. Columns, arches, flat plates and curved panels with and without cutouts are considered.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-69998
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Fundamental Mechanisms of Tensile Fracture in Aluminum Sheet Unidirectionally Reinforced with Boron Filament (1971)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Results are presented from an experimental research effort to gain a more complete understanding of the physics of tensile fracture in unidirectionally reinforced B-Al composite sheet. By varying the degree of filament degradation resulting from fabrication, composite specimens were produced which failed in tension by the cumulative mode, the noncumulative mode, or by any desired combination of the two modes. Radiographic and acoustic emission techniques were combined to identify and physically describe a previously unrecognized fundamental fracture mechanism which was responsible for the noncumulative mode. The tensile strength of the composite was found to be severely limited by the noncumulative mechanism which involved the initiation and sustenance of a chain reaction of filament fractures at a relatively low stress level followed by ductile fracture of the matrix. The minimum average filament stress required for initiation of the fracture mechanism was shown to be approximately 170 ksi, and appeared to be independent of filament diameter, number of filament layers, and the identity of the matrix alloy.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-67577
    Format: application/pdf
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  • 6
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    Mechanics of Fracture in Adhesive Joints (1971)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Interdependence of continuum mechanics and physical chemistry in failure analysis of adhesives
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-121857 , UTEC-DO-71-155
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    An estimator for the standard deviation of a natural frequency. II. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A method has been presented for estimating the variability of a system's natural frequencies arising from the variability of the system's parameters. The only information required to obtain the estimates is the member variability, in the form of second-order properties, and the natural frequencies and mode shapes of the mean system. It has also been established for the systems studied by means of Monte Carlo estimates that the specification of second-order properties is an adequate description of member variability.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 71-WA/APM-8
    Format: text
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  • 8
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    Synthesis of stiffness and mass matrices from experimental vibration modes. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: With highly complex structures, it is sometimes desirable to derive a dynamic model of the system from experimental vibration data. This paper presents algorithms for synthesizing the mass and stiffness matrices from experimentally derived modal data in a way which preserves the physical significance of the individual mass and stiffness elements. The synthesizing procedures allow for the incorporation of other mass and stiffness data, whether empirical or based on the analyst's insight. The mass and stiffness matrices are derived for a cantilever beam example and are compared with those obtained using earlier techniques.
    Keywords: STRUCTURAL MECHANICS
    Type: SAE PAPER 710787 , Society of Automotive Engineers, National Aeronautic and Space Engineering and Manufacturing Meeting; Sept. 28-30, 1971; Los Angeles, CA
    Format: text
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  • 9
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    Statistical analysis of the modal properties of large structural systems. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A theory is developed to predict eigenvalue and eigenvector uncertainty in large dynamic models. The uncertainty is based on physical property uncertainty and should not be confused with numerical roundoff, although the method can be extended to include the latter. The theory, when implemented on a computer, is used to analyze the uncertainties in frequencies and mode shapes based on uncertainties in mass, stiffness, modulus of elasticity, etc. The method incorporates a linear statistical model which is quite adequate for handling property uncertainties of 10% or more. The model is not limited to small systems but uses certain statistical assumptions as well as selective matrix manipulations to keep the size of all matrix operations to within the number of degrees of freedom of the system. Examples are given for two longitudinal vibration problems, and the results are supported by a Monte Carlo analysis.
    Keywords: STRUCTURAL MECHANICS
    Type: SAE PAPER 710785 , Society of Automotive Engineers, National Aeronautic and Space Engineering and Manufacturing Meeting; Sept. 28-30, 1971; Los Angeles, CA
    Format: text
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  • 10
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    A survey of modal synthesis methods. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Several modal synthesis procedures for the dynamic analysis of largy composite structural systems are surveyed. The matrix formulation of the free-free modal synthesis procedures is presented. Also given are schematic flow charts of the analysis procedure used in three prominent methods. The advantages and disadvantages of several modal synthesis methods for different classes of structural problems are presented in order to enable the engineer to select the best procedure for his particular type of problem.
    Keywords: STRUCTURAL MECHANICS
    Type: SAE PAPER 710783 , Society of Automotive Engineers, National Aeronautic and Space Engineering and Manufacturing Meeting; Sept. 28-30, 1971; Los Angeles, CA
    Format: text
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