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  • 1
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    On the use of solid- and shell-type finite elements in creep-damage predictions of thinwalled structures (2001)
    Springer
    Details
    Publication Date: 2001-03-19
    Print ISSN: 0939-1533
    Electronic ISSN: 1432-0681
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 2
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    Analyse technologisch bedingter Spannungen und Verzerrungen in dünnwandigen Bauteilen aus verstärkten Kunststoffen (2000)
    Springer
    Details
    Publication Date: 2000-02-17
    Print ISSN: 0015-7899
    Electronic ISSN: 1434-0860
    Topics: Technology
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  • 3
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    Analyse technologisch bedingter Spannungen und Verzerrungen in dünnwandigen Bauteilen aus verstärkten Kunststoffen (1999)
    Springer
    Details
    Publication Date: 1999-01-01
    Print ISSN: 0015-7899
    Electronic ISSN: 1434-0860
    Topics: Technology
    Published by Springer
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  • 4
    Electronic Resource
    Electronic Resource
    Analyse technologisch bedingter Spannungen und Verzerrungen in dünnwandigen Bauteilen aus verstärkten Kunststoffen (2000)
    Springer
    Forschung im Ingenieurwesen 65 (2000), S. 207-216 
    Details
    ISSN: 1434-0860
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology
    Description / Table of Contents: Abstract During technological processes the stress and strain states in structural elements are changing. Such process is the autoclave manifacturing of thinwalled elements made from composites. With respect to the assumed geometrical form (shells of revolution) a contact problem of two coaxial shells will be analysed, one shell is the structural element, the second – the metallic form. The shell theory formulation is based on geometrical nonlinear equations including the transverse shear. In addition, the results of the non-stationary thermal contact problem are taken into account. The solution algorithm allows the calculation of the technological stresses and strains and the prediction of the geometrical variations.
    Notes: Zusammenfassung Im Verlauf von technologischen Prozessen kann sich der Spannungs- und Verzerrungszustand in Formteilen ändern. Am Beispiel der Formgebung von Konstruktionselementen aus Verbundwerkstoffen im Autoklaven werden entsprechende Vorgänge untersucht. Die Konstruktionselemente werden dabei als dünne Rotationsschalen modelliert. Man erhält eine Kontaktaufgabe für koaxiale Schalen, wobei eine Schale das aushärtende Bauteil darstellt und die zweite die metallische Form. Die Verzerrungskinematik der Schalen wird auf der Grundlage der geometrisch-nichtlinearen Theorie unter Einbeziehung der Querschubverzerrungen formuliert. In die Analyse gehen die Ergebnisse der vorab gelösten Aufgabe über das nichtstationäre Wärmeleitungsproblem zwischen Form und Bauteil ein. Gleichzeitig wird die Möglichkeit der Änderung der Matrixeigenschaften berücksichtigt. Der vorgestellte Lösungsalgorithmus gestattet die Erfassung der technologisch bedingten Spannungen und Verzerrungen während des gesamten Aushärtungsvorganges. Gleichzeitig ist eine Prognose der Geometrieabweichungen des Bauteils nach Entnahme aus der Form möglich.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100109900009
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  • 5
    Electronic Resource
    Electronic Resource
    Identification of effective properties of particle reinforced composite materials (1998)
    Springer
    Computational mechanics 22 (1998), S. 317-325 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract For the determination of effective elastic properties an energy averaging procedure has been used for particle reinforced composite materials. This procedure is based on finite element calculations of the deformation energy of a characteristic volume element. The proposed approach allows the determination of effective properties of particle reinforced composite with acceptable precision. The calculated effective properties of the composite are found in range between upper and lower Hashin-Shtrikman bounds. The averaging elastic properties of the composite depend on the properties of the particles, matrix volume fraction of the particles and some parameters taking into account the influence of the interphase between matrix and particles. These dependencies can be presented by simple analytical functions approximatically. An identification procedure basing on numerical experiments allows the estimation of the unknown approximation parameters. The obtained functions describe precisely the numerical data for any relationship between material constituents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050363
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical identification of properties of particle-reinforced composite materials (1998)
    Springer
    Mechanics of composite materials 34 (1998), S. 279-284 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The paper deals with numerical identification of the average elastic properties of particle-reinforced composite materials. The finite element method for the determination of deformation energy of the characteristic volume element was used. In earlier analytical investigations, an approximation function of the averaged elastic properties of the composite was derived. An identification procedure allows the estimation of the unknown approximation parameters from numerical experiments. The obtained functions describe precisely the numerical data for any relationships between constituents of the material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02256047
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  • 7
    Electronic Resource
    Electronic Resource
    Numerical modelling of damping properties of laminated composites (1994)
    Springer
    Mechanics of composite materials 30 (1994), S. 256-266 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616211
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of interphase on residual thermal stresses. 1. Single fiber composite materials (1995)
    Springer
    Mechanics of composite materials 30 (1995), S. 417-425 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions The residual thermal stresses in the constituents of a fiber-reinforced epoxy have been predicted using a concentric three-cylindrical (fiber-interphase-matrix) assemblage analysis. The interphase has been treated as a region with a variable Young's modulus — a direct consequence of the changes in the microstructure of the matrix near the fiber surface. The Navier equations of elasticity have been solved in series form solutions for each type of property variation. A parametric study is used to demonstrate the fact that changes in the interphase properties can drastically affect the residual stresses in the interphase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616769
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  • 9
    Electronic Resource
    Electronic Resource
    The effect of interphase on residual thermal stresses. 2. Unidirectional fiber composite materials (1997)
    Springer
    Mechanics of composite materials 33 (1997), S. 142-152 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In real composite materials an additional phase may exist between the fiber and the matrix. This phase, commonly known as the interphase, is a local region that results from the matrix bonds with the fiber surface or the fiber sizing. The differing thermal expansions or contractions of the fiber and matrix cause thermally induced stresses in composite materials. In the present study, a four-cylinder model is proposed for the determination of residual thermal stresses in unidirectional composite materials. The elastic modulus of the interphase is a function of the interphase radius and thickness. The governing equations in terms of displacements are solved in the form of expansion into a series [1]. The effective elastic characteristics are obtained using the finite element approach. The effect of the interphase thickness and different distributions of the interphase Young's modulus on the thermal residual stress field in unidirectional composite materials is investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269601
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  • 10
    Electronic Resource
    Electronic Resource
    Effective elastic properties of particulate-reinforced compossite materials (1997)
    Springer
    Mechanics of composite materials 33 (1997), S. 315-321 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A numerical approach for determination of the effective properties of particulate composite materials has been developed. A representative volume element (RVE) of the composite material is analyzed with help of the finite-element method. Uniform boundary displacements or tractions are applied on the boundaries of the RVE for introducing the known average strain in the RVE. Local stress and strain distributions in the RVE are calculated using the finite-element method. Different effective elastic constants can be calculated by averaging the local fields corresponding to different sets of boundary conditions. The present approach allows us to determine the effective properties of particle-reinforced composites with acceptable accuracy. The calculated effective properties of the composite are between the upper and lower Hashin—Shtrikman bounds. The results based on the present approach lead to higher stiffness of composites in comparison with analytical approaches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02256281
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