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  • 1990-1994  (4)
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  • 1
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    Unknown
    A procedure for utilization of a damage-dependent constitutive model for laminated composites (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Described here is the procedure for utilizing a damage constitutive model to predict progressive damage growth in laminated composites. In this model, the effects of the internal damage are represented by strain-like second order tensorial damage variables and enter the analysis through damage dependent ply level and laminate level constitutive equations. The growth of matrix cracks due to fatigue loading is predicted by an experimentally based damage evolutionary relationship. This model is incorporated into a computer code called FLAMSTR. This code is capable of predicting the constitutive response and matrix crack damage accumulation in fatigue loaded laminated composites. The structure and usage of FLAMSTR are presented along with sample input and output files to assist the code user. As an example problem, an analysis of crossply laminates subjected to two stage fatigue loading was conducted and the resulting damage accumulation and stress redistribution were examined to determine the effect of variations in fatigue load amplitude applied during the first stage of the load history. It was found that the model predicts a significant loading history effect on damage evolution.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-TM-104219 , NAS 1.15:104219
    Format: application/pdf
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  • 2
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    A model for predicting damage induced fatigue life of laminated composite structural components (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: This paper presents a model for predicting the life of laminated composite structural components subjected to fatigue induced microstructural damage. The model uses the concept of continuum damage mechanics, wherein the effects of microcracks are incorporated into a damage dependent lamination theory instead of treating each crack as an internal boundary. Internal variables are formulated to account for the effects of both matrix cracks and internal delaminations. Evolution laws for determining the damage variables as functions of ply stresses are proposed, and comparisons of predicted damage evolution are made to experiment. In addition, predicted stiffness losses, as well as ply stresses are shown as functions of damage state for a variety of stacking sequences.
    Keywords: STRUCTURAL MECHANICS
    Type: ICAS Congress; Sept. 9-14, 1990; Stockholm; Sweden
    Format: text
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  • 3
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    Unknown
    Modeling of delamination damage evolution in laminated composites subjected to low velocity impact (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This study examines the delamination evolution, under quasi-static conditions, of laminated polymeric composites with mechanically nonlinear resin rich interfaces. The constitutive behavior of the interface is represented by two models developed by Needleman and Tvegaard. These models assumed that the interfacial tractions, a function of only the interfacial displacement, will behave similarly to the interatomic forces generated during the interatomic seperation. The interface material's parameters control the load at which the delamination growth initiates and the final delamination size. A wide range of damage accumulation responses have been obtained by varying the model parameters. These results show that Tvergaard's model has been found to be better suited of the two models in predicting damage evolution for the configurations examined.
    Keywords: COMPOSITE MATERIALS
    Type: International Journal of Damage Mechanics (ISSN 1056-7895); 3; 4; p. 378-407
    Format: text
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  • 4
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    Unknown
    Modeling Progressive Damage In Laminated Composites (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Report describes methodology for predicting strengths and service lifetimes of structural components made of laminate composite materials.
    Keywords: MECHANICS
    Type: LAR-14437 , NASA Tech Briefs (ISSN 0145-319X); 18; 9; P. 129
    Format: text
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