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  • Other Sources  (4)
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  • 1
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    Cracked finite elements proposed for NASTRAN (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The recent introduction of special crack-tip singularity elements, usually referred to as cracked elements, has brought the power and flexibility of the finite-element method to bear much more effectively on fracture mechanics problems. This paper recalls the development of two cracked elements and presents the results of some applications proving their accuracy and economy. Judging from the available literature on numerical methods in fracture mechanics, it seems clear that the elements described have been used more extensively than any others in practical fracture mechanics applications.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 531-550
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Finite element computer program to analyze cracked orthotropic sheets (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A two dimensional orthotropic sheet with through-the-thickness cracks and temperature gradient was analyzed. The program includes special crack tip elements that account for singular stress fields associated with crack opening and crack sliding displacements at the crack tip. The program also includes a linear spring element and a constant strain, triangular element. A number of problems for which closed form solutions exist were analyzed to demonstrate the capabilities of the program.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-2698
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Finite-element analysis of dynamic fracture (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Applications of the finite element method to the two dimensional elastodynamics of cracked structures are presented. Stress intensity factors are computed for two problems involving stationary cracks. The first serves as a vehicle for discussing lumped-mass and consistent-mass characterizations of inertia. In the second problem, the behavior of a photoelastic dynamic tear test specimen is determined for the time prior to crack propagation. Some results of a finite element simulation of rapid crack propagation in an infinite body are discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 1; p 215-225
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Analysis of cracked orthotropic sheets (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Computer program performs two dimensional elastostatic analysis of plane anisotropic homogeneous sheets with through-the-thickness cracks and temperature gradients.
    Keywords: MECHANICS
    Type: LAR-12288 , NASA Tech Briefs (ISSN 0145-319X); 3; 3; P. 420
    Format: text
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    NASA TECHNICAL REPORTS
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