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  • General Chemistry  (1,050)
  • STRUCTURAL MECHANICS
  • 1985-1989  (1,432)
  • 1910-1914
  • 1988  (1,432)
Collection
Keywords
Publisher
Years
  • 1985-1989  (1,432)
  • 1910-1914
Year
  • 1
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    Fatigue behavior of 5Ni-Cr-Mo-V steel weldments containing fabrication discontinuities (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The applicability of linear elastic fracture mechanics to characterize the fatigue behavior of high-strength steel weldments containing lack-of-penetration (LOP) and slag/lack-of-fusion (S/LOF) discontinuities is explored. Full penetration, double-V butt welds with reinforcements removed were tested under zero-to-tension axial loading. Various filler metals and welding techniques were used. Both sound welds and welds containing discontinuities were cycled to failure. Where possible, cycles to crack initiation were estimated by strain gage measurements. The fracture mechanics approach was successful in correlating the fatigue lifetimes of specimens containing single LOP discontinuities of varying size. However, the fatigue behavior of specimens containing multiple S/LOF discontinuities proved to be much more complex and difficult to analyze.
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Structural Analysis Methods Development for Turbine Hot Section Components (1988)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: The structural analysis technologies and activities of the NASA Lewis Research Center's gas turbine engine Hot Section Technology (HOST) program are summarized. The technologies synergistically developed and validated include: time-varying thermal/mechanical load models; component-specific automated geometric modeling and solution strategy capabilities; advanced inelastic analysis methods; inelastic constitutive models; high-temperature experimental techniques and experiments; and nonlinear structural analysis codes. Features of the program that incorporate the new technologies and their application to hot section component analysis and design are described. Improved and, in some cases, first-time 3-D nonlinear structural analyses of hot section components of isotropic and anisotropic nickel-base superalloys are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-100298 , E-3926 , NAS 1.15:100298
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The 58th Shock and Vibration Symposium (1988)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Dynamic analysis, dynamic testing, space shuttle main engine vibration, isolation and damping and analytical methods are among the topics discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CP-2488-VOL-2 , M-572-VOL-2 , NAS 1.55:2488-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Smooth indentation of a composite laminate (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Finite difference method is used to analyze the problem of smooth contact between a rigid indenter and a laminated circular plate clamped at the edges. The plate consists of transversely isotropic layers. The interlaminar shear stresses in the contact region are found to be much different from the laminate plate theory solutions. It has been found that low-modulus interlayers cause significant reduction in the maximum interlaminar shear stresses.
    Keywords: STRUCTURAL MECHANICS
    Type: Technical Conference of the American Society for Composites; Sept. 25-29, 1988; Seattle, WA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The natural frequencies of symmetric angle-ply laminates derived from eigensensitivity analysis (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: In this paper, a new closed-form approximate solution for the natural frequencies of symmetric rectangular angle-ply laminates simply supported on all four edges is derived. The solution, obtained from eigensensitivity analysis, is expressed as a truncated Fourier series in the ply angle. Results show that the prediction for the fundamental frequency is quite accurate for engineering applications, often within 1-2 percent of the true frequency.
    Keywords: STRUCTURAL MECHANICS
    Type: Technical Conference of the American Society for Composites; Sept. 25-29, 1988; Seattle, WA; United States
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    NASA TECHNICAL REPORTS
  • 6
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    Effect of adhesive debond on stress-intensity factors in bonded composite panels (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Stress-intensity factors are calculated for a cracked infinite sheet adhesively bonded to a stringer, and debonding of the adhesive layer is predicted. The stringer is modeled as a semiinfinite sheet. Adhesive nonlinearity is also included. Both the sheet and stringer are treated as homogeneous, orthotropic materials, a set of integral equations is formulated and solved to obtain the adhesive shear stresses and crack-tip stress-intensity factors. Adhesive debonding is predicted using a rupture criterion based on the combined adhesive stresses. A through-the-thickness crack is located in the infinite sheet perpendicular to the edge of the stringer. When the crack is not under the stringer, the debond extends along the edge of the stringer. When the crack tip is beneath the stringer, the debond extends to the crack tip, then along the edge of the stringer. Stress levels required for debond initiation decrease as the crack tip is moved beneath the stringer. With a nonlinear adhesive, the debond initiates at higher applied stress levels than in linear adhesive cases. Compared with the linear adhesive solution, modeling a nonlinear adhesive causes the stress-intensity factor to decrease when debonding is included.
    Keywords: STRUCTURAL MECHANICS
    Type: International Symposium on Adhesively Bonded Joints; Testing, Analysis, and Design; Sept. 10-12, 1986; Baltimore, MD; United States
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    NASA TECHNICAL REPORTS
  • 7
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    A comparison of pure mode I and mixed mode I-III cracking of an adhesive containing an open knit cloth carrier (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Static and fatigue tests were carried out on two commercial modified epoxy film adhesives with a wide open knit polyester carrier in order to compare crack resistance in mode I and mixed mode I-III loading. The carrier cloth is found to have a significant influence on the cracking behavior of the adhesives. The open air net carrier used in this study separates from the adhesive in mode I cracking but shreds during mixed-mode crack extension. This decreases the opening mode toughness but increases the mixed-mode toughness as compared with results obtained earlier using a heavier knit carrier. The results suggest that the type of carrier may have a far larger influence on crack resistance than is generally recognized.
    Keywords: STRUCTURAL MECHANICS
    Type: International Symposium on Adhesively Bonded Joints; Testing, Analysis, and Design; Sept. 10-12, 1986; Baltimore, MD; United States
    Format: text
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  • 8
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    Factors influencing elastic stresses in double cantilever beam specimens (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: An elastic stress analysis was conducted for a double cantilever beam (DCB) specimen using finite-element methods. The purpose of this study was to identify the important parameters that influence stresses ahead of the delamination front. The study focused on an aluminum DCB specimen, typical of adhesively-bonded joints, and on a graphite/epoxy specimen representing a cocured composite. Opening mode sigma sub y stresses ahead of the crack tip were calculated and compared with those for a monolithic reference specimen. Beyond the singularity-dominated region very near the crack tip, the sigma sub y distribution was elevated compared to the monolithic case. Both the adhesive thickness and the adherend transverse (thickness-direction) stiffness were found to influence the elevation of sigma sub y. In contrast, adherend thickness and longitudinal stiffness has very little effect on this stress distribution. Estimates for adhesive yielding beyond the aluminum DCB crack tip showed that both the area and height of the plastic zone increased to a peak value for increasing adhesive thicknesses. Results from this study would provide insight for comparing data from different DCB specimens and for designing new DCB specimens.
    Keywords: STRUCTURAL MECHANICS
    Type: International Symposium on Adhesively Bonded Joints; Testing, Analysis, and Design; Sept. 10-12, 1986; Baltimore, MD; United States
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    NASA TECHNICAL REPORTS
  • 9
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    Deformations and strains in a thick adherend lap joint (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Displacement fields in a thick adherend lap joint were measured by high-sensitivity moire interferometry. Contour maps of in-plane U and V displacements were obtained across adhesive and adherend surfaces. Loads ranged from a modest load to a near-failure load. Quantitative results are given for displacements and strains in the adhesive and along the adhesive/adherend boundary lines. The results show nearly constant shear strain in the adhesive, nonlinear strains as a function of load or average shear stress, and viscoelastic or time-dependent response. Longitudinal normal strains in the adhesive are nearly two orders of magnitude less than the shear strains. With its subwavelength displacement resolution and high spatial resolution, moire interferometry is especially well suited for deformation studies of adhesive joints.
    Keywords: STRUCTURAL MECHANICS
    Type: International Symposium on Adhesively Bonded Joints; Testing, Analysis, and Design; Sept. 10-12, 1986; Baltimore, MD; United States
    Format: text
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  • 10
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    Adhesively bonded joints: Testing, analysis, and design; Proceedings of the International Symposium, Baltimore, MD, Sept. 10-12, 1986 (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The papers contained in this volume provide an overview of the state of the art of testing, analysis, and design of adhesively bonded joints. The papers are grouped in the following sections: mechanical testing, stress analysis, failure mechanisms, and design and durability. Specific topics discussed include determination and verification of elastic parameters for adhesives; factors influencing elastic stresses in double cantilever beam specimens; special mixed finite elements for interfacial stress analysis of adhesively bonded joints; debonding characteristics of adhesively bonded woven Kevlar composites; and environmental durability of adhesively bonded joints.
    Keywords: STRUCTURAL MECHANICS
    Type: International Symposium on Adhesively Bonded Joints; Testing, Analysis, and Design; Sept. 10-12, 1986; Baltimore, MD; United States
    Format: text
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