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  • Chang, Fu-Kuo  (9)
  • 1990-1994  (9)
  • 1991  (9)
Material
Publisher
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Language
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  • 1990-1994  (9)
Year
  • 1991  (9)
  • 1
    Online Resource
    Online Resource
    Damage Tolerance of Laminated Composites Containing an Open Hole and Subjected to Tensile Loadings
    SAGE Publications ; 1991
    In:  Journal of Composite Materials Vol. 25, No. 3 ( 1991-03), p. 274-301
    Details
    In: Journal of Composite Materials, SAGE Publications, Vol. 25, No. 3 ( 1991-03), p. 274-301
    Abstract: An investigation was conducted to study tensile failure of laminated composites containing an open hole. This investigation was especially concerned with determining the response, type and extent of damage in composites as a function of applied load. Both an analysis and experiments were performed for graphite/epoxy composites during the study. A progressive damage analysis was developed to study the problem. The analysis was verified by an extensive comparison between the numerical calculations based on the analysis and the experimental data obtained during the investigation as well as from published literature. Different graphite/epoxy composite materials were considered in the study. Overall, good agreements were found between the calculations and the data. Based on the study, it was found that the types and extent of internal damage in the notched composites strongly depend on the ply orientation of the laminates. The types and the size of damage directly affect the strength and failure mode of the composites.
    Type of Medium: Online Resource
    ISSN: 0021-9983 , 1530-793X
    URL: Article
    DOI: 10.1177/002199839102500303
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1991
    detail.hit.zdb_id: 160490-9
    detail.hit.zdb_id: 2081924-9
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Modeling the Viscoplastic Behavior of Fiber-Reinforced Thermoplastic Matrix Composites at Elevated Temperatures
    SAGE Publications ; 1991
    In:  Journal of Composite Materials Vol. 25, No. 4 ( 1991-04), p. 334-374
    Details
    In: Journal of Composite Materials, SAGE Publications, Vol. 25, No. 4 ( 1991-04), p. 334-374
    Abstract: An investigation was performed to study the mechanical response of fiber-reinforced thermoplastic matrix composites at elevated temperatures. The primary concern of the study was the effect of temperature on the viscoplastic behavior of the composites. During the investigation, an analytical model was developed for analyzing the response of both unidirectional and multidirectional composites at elevated temperatures. The model considers that the fibers have a linearly elastic behavior but the matrix responds viscoplastically with temperature. Micromechanics theories were adopted and developed to integrate fibers and matrix properties for predicting the response of unidirectional composites. Numerical algorithms were developed based on the lamination theory for evaluating the response of the laminated composites. Based on the model, a computer code was also developed for calculating the mechanical response of thermoplastic matrix composites subjected to both thermal and mechanical loading. In order to verify the model, experiments were also conducted for multidirectional APC-2 carbon/PEEK fiber composites and fairly good agreements were found between the predictions and the data.
    Type of Medium: Online Resource
    ISSN: 0021-9983 , 1530-793X
    URL: Article
    DOI: 10.1177/002199839102500401
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1991
    detail.hit.zdb_id: 160490-9
    detail.hit.zdb_id: 2081924-9
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Impact damage resistance of graphite/epoxy laminated composites
    Wiley ; 1991
    In:  Polymer Engineering and Science Vol. 31, No. 18 ( 1991-09), p. 1294-1300
    Details
    In: Polymer Engineering and Science, Wiley, Vol. 31, No. 18 ( 1991-09), p. 1294-1300
    Type of Medium: Online Resource
    ISSN: 0032-3888 , 1548-2634
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.1002/pen.v31:18
    DOI: 10.1002/(ISSN)1548-2634
    DOI: 10.1002/pen.760311803
    Language: English
    Publisher: Wiley
    Publication Date: 1991
    detail.hit.zdb_id: 2006718-5
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  • 4
    Online Resource
    Online Resource
    A New Approach toward Understanding Damage Mechanisms and Mechanics of Laminated Composites Due to Low-Velocity Impact: Part I—Experiments
    SAGE Publications ; 1991
    In:  Journal of Composite Materials Vol. 25, No. 8 ( 1991-08), p. 992-1011
    Details
    In: Journal of Composite Materials, SAGE Publications, Vol. 25, No. 8 ( 1991-08), p. 992-1011
    Abstract: An investigation comprised of experiments and analysis was performed to study impact damage in laminated composites caused by low-velocity impact. The major objective of the study was to fundamentally understand the failure mechanisms and mechanics of fiber-reinforced composites resulting from impact and to identify the essential parameters governing the impact damage. Matrix cracks and delaminations were the primary concern of the study. This paper emphasizes the experimental work of the study. A unique and special air-pressed impact tester was designed and built for the investigation. The major characteristics of the tester was the design of a rectangular barrel and a rectangular based impactor rather than a small circular barrel and a spherical ball, which are commonly adopted for impact study. This new design allows the user to control the impact damage patterns by appropriately selecting different shapes and sizes of the noses which are mounted to the base of the impactor. In this study, a line-nosed impactor was adopted which could produce a uniformly distributed, transient dynamic load across the specimen's width. Accordingly, the impact damage mode was considerably simplified, and the results of the tests were extensively examined and studied for understanding the basic impact damage mechanisms. The essential parameters governing the impact damage were also identified.
    Type of Medium: Online Resource
    ISSN: 0021-9983 , 1530-793X
    URL: Article
    DOI: 10.1177/002199839102500803
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1991
    detail.hit.zdb_id: 160490-9
    detail.hit.zdb_id: 2081924-9
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Analysis of Laminated Composites Containing Distributed Piezoelectric Ceramics
    SAGE Publications ; 1991
    In:  Journal of Intelligent Material Systems and Structures Vol. 2, No. 1 ( 1991-01), p. 59-71
    Details
    In: Journal of Intelligent Material Systems and Structures, SAGE Publications, Vol. 2, No. 1 ( 1991-01), p. 59-71
    Abstract: A finite element formulation was developed for modeling the dynamic as well as static response of laminated composites containing distributed piezoelectric ceram ics subjected to both mechanical and electrical loadings. The formulation was derived from the variational principle with consideration for both the total potential energy of the structures and the electrical potential energy of the piezoceramics. An eight-node three- dimensional composite brick element was implemented for the analysis, and three- dimensional incompatible modes were introduced to take into account the global bending behavior resulting from the local deformations of the piezoceramics. Experiments were also conducted to verify the analysis and the computer simulations. werall, the compari sons between the predictions and the data agreed fairly well.
    Type of Medium: Online Resource
    ISSN: 1045-389X , 1530-8138
    URL: Article
    DOI: 10.1177/1045389X9100200104
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1991
    detail.hit.zdb_id: 2088313-4
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    Online Resource
  • 6
    Online Resource
    Online Resource
    A New Approach toward Understanding Damage Mechanisms and Mechanics of Laminated Composites Due to Low-Velocity Impact: Part II—Analysis
    SAGE Publications ; 1991
    In:  Journal of Composite Materials Vol. 25, No. 8 ( 1991-08), p. 1012-1038
    Details
    In: Journal of Composite Materials, SAGE Publications, Vol. 25, No. 8 ( 1991-08), p. 1012-1038
    Abstract: An investigation consisting of both analysis and experiments was performed to study impact damage mechanisms and mechanics of laminated composites subjected to low-velocity impact. In order to fundamentally understand the impact damage of laminated composites, a unique test program was developed and performed by using a specially designed line-loading impactor. Experimental findings from the tests were obtained and presented in the first part of this series on the impact study. In this paper, an analysis will be presented for predicting the impact damage resulting from the line-loading impact and for determining essential parameters governing the impact damage. The model consists of a transient dynamic finite element analysis for calculating stresses, strains and deformations of composite plates during impact, and a failure analysis for predicting the threshold of impact damage and initiation of delaminations and micro-cracks. The predictions based on the analysis agreed with the test results reasonably well. Based on the unique approach, the proposed analysis, coupled with the experiment, was able to provide comprehensive information for fundamentally understanding the impact damage mechanisms and mechanics of laminated composites.
    Type of Medium: Online Resource
    ISSN: 0021-9983 , 1530-793X
    URL: Article
    DOI: 10.1177/002199839102500804
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1991
    detail.hit.zdb_id: 160490-9
    detail.hit.zdb_id: 2081924-9
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Damage Tolerance of Laminated Composites Containing an Open Hole and Subjected to Compressive Loadings: Part I—Analysis
    SAGE Publications ; 1991
    In:  Journal of Composite Materials Vol. 25, No. 1 ( 1991-01), p. 2-43
    Details
    In: Journal of Composite Materials, SAGE Publications, Vol. 25, No. 1 ( 1991-01), p. 2-43
    Abstract: An analytical investigation was performed to study the damage in laminated composites containing an open hole and subjected to compressive loading. A progressive damage model was developed during the investigation to predict the extent and the failure modes of the internal damage in the laminates as a function of the applied load and to simulate the in-plane response of the laminates from initial loading to final collapse. The model consists of a stress analysis and a failure analysis. Stresses and strains inside the laminates were calculated by a nonlinear finite element analysis which is based on finite deformation theory with consideration of material and geometric nonlinearities. The types and extent of damage in the material were predicted by a failure analysis which includes a set of proposed failure criteria and material degradation models. Numerical results from the model were compared with the data which were obtained during the investigation and are presented in a companion paper [1]. Good agreements were found between the predictions and the test results. A computer code was developed based on the model which can be used as a tool for sizing and designing composite plates containing holes and subjected to compression.
    Type of Medium: Online Resource
    ISSN: 0021-9983 , 1530-793X
    URL: Article
    DOI: 10.1177/002199839102500101
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1991
    detail.hit.zdb_id: 160490-9
    detail.hit.zdb_id: 2081924-9
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    Online Resource
  • 8
    Online Resource
    Online Resource
    Effect of Load Distribution on the Fiber Buckling Strength of Unidirectional Composites
    SAGE Publications ; 1991
    In:  Journal of Composite Materials Vol. 25, No. 1 ( 1991-01), p. 65-87
    Details
    In: Journal of Composite Materials, SAGE Publications, Vol. 25, No. 1 ( 1991-01), p. 65-87
    Abstract: An investigation was performed to study the fiber buckling failure of fiber-reinforced composites. This work was especially focused on understanding the effect of fiber-matrix interaction due to nonuniform loading on fiber buckling strength of unidirectional composites. An analytical model based on the energy principle was developed for predicting the fiber buckling strength of unidirectional composites. The model, which included the fiber bending energy and the matrix shearing energy, also considered the matrix extension energy which was attributed to the interaction between the fibers and the matrix. Numerical solutions were generated from the model to study the effect of fiber-matrix interaction on the fiber buckling strength of composites subjected to different types of loadings. Based on the calculations, it was found that the inclusion of fiber-matrix interaction in the fiber buckling analysis is very important for composites with nonuniform stress distributions. This becomes especially important for notched laminates and thick section composites subjected to compressive loading.
    Type of Medium: Online Resource
    ISSN: 0021-9983 , 1530-793X
    URL: Article
    DOI: 10.1177/002199839102500103
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1991
    detail.hit.zdb_id: 160490-9
    detail.hit.zdb_id: 2081924-9
    Location Call Number Limitation Availability
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    Online Resource
  • 9
    Online Resource
    Online Resource
    Damage Tolerance of Laminated Composites Containing an Open Hole and Subjected to Compressive Loadings: Part II—Experiment
    SAGE Publications ; 1991
    In:  Journal of Composite Materials Vol. 25, No. 1 ( 1991-01), p. 44-64
    Details
    In: Journal of Composite Materials, SAGE Publications, Vol. 25, No. 1 ( 1991-01), p. 44-64
    Abstract: An experimental investigation was conducted to study the compression response of composite plates containing holes. Compression tests were performed on T300/976 Graphite/Epoxy composites for five different ply orientations, covering a wide range of response types. For each ply orientation, different geometries were chosen, giving a total of over 30 different test configurations. Two of the layups were also tested for the effect of ply clustering. The samples were tested for their compressive response to initial detection of failure, and beyond to final failure. Load-shortening measurements, microscopy, and Dye-Enhanced X-Radiography were used as evaluation techniques. Based on the study, it was found that ply orientation significantly affects damage mechanisms of composites in compression. Different failure mechanisms will result in totally different failure modes and failure loads, and response of the materials beyond initial failure.
    Type of Medium: Online Resource
    ISSN: 0021-9983 , 1530-793X
    URL: Article
    DOI: 10.1177/002199839102500102
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1991
    detail.hit.zdb_id: 160490-9
    detail.hit.zdb_id: 2081924-9
    Location Call Number Limitation Availability
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    Online Resource
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