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  • STRUCTURAL MECHANICS  (109)
  • ASTROPHYSICS
  • 1970-1974  (109)
  • 1960-1964
  • 1972  (57)
  • 1970  (52)
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  • 1970-1974  (109)
  • 1960-1964
Year
  • 11
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    Prestressing in structural synthesis (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Prestressing in minimum weight design of statically indeterminate structures
    Keywords: STRUCTURAL MECHANICS
    Type: ; RO(
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    A fracture mechanics analysis of adhesive failure in a single lap shear joint. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Discussion of adhesive fracture of single lap shear joints in terms of a maximum stress criterion and an energy balance. The Goland and Reissner (1944) analysis is used to determine the stress distribution in the adhesive assembly, and the results obtained are introduced into an energy balance to determine the initiation of adhesive fracture. In the stress analysis the loads at the edges of the joint are first determined. This is a problem in which the deformation of the joint sheets must be taken into account and is solved by using the finite-deflection theory of cylindrically bent plates. Then the stress in the joint due to applied loads is determined. This problem is formulated as one in plane strain consisting of two rectangular sheets of equal thickness and unit width. With the aid of this stress analysis and the stresses obtained from the conditions of equilibrium the contributions to the energy change with crack length are calculated. The analysis performed is then compared with a maximum stress criterion for a lap joint.
    Keywords: STRUCTURAL MECHANICS
    Type: SESA PAPER 1990A , Society for Experimental Stress Analysis, Spring Meeting; May 23, 1972 - May 26, 1972; Cleveland, OH
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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    Strain inhomogeneities, molecular chain scission and stress-deformation in polymers (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Bond rupture and fracture in semicrystalline polymers, noting agreement with random length molecular tie chain scission model
    Keywords: STRUCTURAL MECHANICS
    Type: ; TROPHYSICAL JOURNAL
    Format: text
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    NASA TECHNICAL REPORTS
  • 14
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    Experimental investigation of strains in fabric under biaxial and shear forces. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The paper defines the experimental phase of an objective to obtain the mechanical characteristics and coefficients required by the generalized form of Hooke's law for nylon-polyurethane-coated fabric. Test specimens were cylindrical fabric sleeves and were loaded in axial tension by an Instron, in hoop tension by pressurizing, and in shear by a torquing fixture. An extensive amount of strain data is included for a wide combination of the three membrane loads. The tests indicate highly nonlinear stress-strain characteristics of the fabric and a strong dependency on all three membrane loads.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Aircraft; 9; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 15
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    Sonic-boom-induced building structure responses including damage. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Concepts of sonic-boom pressure loading of building structures and the associated responses are reviewed, and results of pertinent theoretical and experimental research programs are summarized. The significance of sonic-boom load time histories, including waveshape effects, are illustrated with the aid of simple structural elements such as beams and plates. Also included are discussions of the significance of such other phenomena as three-dimensional loading effects, air cavity coupling, multimodal responses, and structural nonlinearities. Measured deflection, acceleration, and strain data from laboratory models and full-scale building tests are summarized, and these data are compared, where possible, with predicted values. Damage complaint and claim experience due both to controlled and uncontrolled supersonic flights over communities are summarized with particular reference to residential, commercial, and historic buildings. Sonic-boom-induced building responses are compared with those from other impulsive loadings due to natural and cultural events and from laboratory simulation tests.
    Keywords: STRUCTURAL MECHANICS
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  • 16
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    Establishing an upper bound for window response to the sonic boom. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Study of the failure of glass windows, which is probably the most severe problem confronting the SST program outside of the psychological and sociological aspects. The structural configuration most likely to suffer a window failure due to sonic boom excitation is one representable by a single large room, a single large window, and an open door. It is suggested that if the open door were replaced with another window the resultant stresses in both windows would be substantially reduced.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Sound and Vibration; 21; Mar. 22
    Format: text
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  • 17
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    Strongly coupled stress waves in heterogeneous plates. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Consideration of coupled stress waves generated by an impulsive load applied at one end of a semiinfinite plate. For the field equations governing the one-dimensional coupled waves a hyperbolic system of equations is obtained in which a strong coupling in the second derivatives exists. The method of characteristics described by Chou and Mortimer (1967) is extended to cover the case of strong coupling, and a study is made of the transient stress waves in a semiinfinite plate subjected to an initial step input. Coupled discontinuity fronts are found to propagate at different velocities. The normal plate stress and the bending moment at different time regimes are illustrated by graphs.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal; 10; Aug. 197
    Format: text
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  • 18
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    A non-linear dynamic lumped-parameter model of a rectangular plate. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A lumped-parameter model of a rectangular plate is developed by assuming fundamental mode solutions and using Hamilton's Principle and the Euler equations to set up the differential equation of motion for the system. The plate theory used may be described as the dynamic analogue of the von Karman large-deflection theory. Four sets of symmetrical boundary conditions are considered with the restriction of uniform pressure dynamic loads. The model takes the form of a mass on a cubic-hardening spring with each term defined by algebraic expressions of the plate parameters. The results for some specific problems are compared with two previous solutions. This method is less accurate but simpler to develop and apply.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Sound and Vibration; 21; Apr. 8
    Format: text
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  • 19
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    Vibrations of circular elastic plates due to sonic boom. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The problem of transient axisymmetric vibrations of thin circular elastic plates due to sonic boom excitation is investigated. The equation of motion for a solid circular plate is solved by applying the modified finite Hankel transform and the Laplace transform, and the numerical results are obtained with the help of the digital computer. From the analysis of the data, obtained for the dynamic deflections of the plates for the boom duration, it is concluded that for a normal flight the boom duration has a significant effect on the vibrations of plates as compared to the overpressure of the boom.
    Keywords: STRUCTURAL MECHANICS
    Type: Acoustical Society of America; vol. 52
    Format: text
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  • 20
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    Structural analysis for a 40-story building (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: NASTRAN was chosen as the principal analytical tool for structural analysis of the Illinois Center Plaza Hotel Building in Chicago, Illinois. The building is a 40-story, reinforced concrete structure utilizing a monolithic slab-column system. The displacements, member stresses, and foundation loads due to wind load, live load, and dead load were obtained through a series of NASTRAN runs. These analyses and the input technique are described.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 421-427
    Format: application/pdf
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