Measurements of fiber orientation and elastic-modulus analysis in short-fiber-reinforced composites

AbstractA constitutive function for heat flux in short-fiber-reinforced composites is developed. The fiber orientation distribution is considered using second-order orientation tensor; therefore, the constitutive function for the heat flux will depend on the orientation tensor. The resulting orthotropic equation is discussed also in the context of energy efficiency of buildings.

Download Full-text

A computational modeling approach based on random fields for short fiber-reinforced composites with experimental verification by nanoindentation and tensile tests

Computational Mechanics ◽

10.1007/s00466-020-01958-3 ◽

2021 ◽

Author(s):

Natalie Rauter

Keyword(s):

Numerical Simulations ◽

Correlation Functions ◽

Material Properties ◽

Random Fields ◽

Tensile Tests ◽

Short Fiber ◽

Fiber Reinforced Composites ◽

Reinforced Composites ◽

Fiber Reinforced ◽

Component Level

AbstractIn this study a modeling approach for short fiber-reinforced composites is presented which allows one to consider information from the microstructure of the compound while modeling on the component level. The proposed technique is based on the determination of correlation functions by the moving window method. Using these correlation functions random fields are generated by the Karhunen–Loève expansion. Linear elastic numerical simulations are conducted on the mesoscale and component level based on the probabilistic characteristics of the microstructure derived from a two-dimensional micrograph. The experimental validation by nanoindentation on the mesoscale shows good conformity with the numerical simulations. For the numerical modeling on the component level the comparison of experimentally obtained Young’s modulus by tensile tests with numerical simulations indicate that the presented approach requires three-dimensional information of the probabilistic characteristics of the microstructure. Using this information not only the overall material properties are approximated sufficiently, but also the local distribution of the material properties shows the same trend as the results of conducted tensile tests.

Download Full-text

Anisotropic Effective Moduli of Cracked Short-Fiber Reinforced Composites

Journal of Applied Mechanics ◽

10.1115/1.2791629 ◽

1999 ◽

Vol 66 (3) ◽

pp. 709-713 ◽

Cited By ~ 5

Author(s):

R. S. Feltman ◽

M. H. Santare

Keyword(s):

Short Fiber ◽

Fiber Reinforced Composites ◽

Reinforced Composites ◽

Effective Moduli ◽

Fiber Reinforced ◽

Fiber Fracture ◽

Composite Systems ◽

Reinforced Composite ◽

Anisotropic Elastic ◽

Energy Dissipated

A model is presented to analyze the effect of fiber fracture on the anisotropic elastic properties of short-fiber reinforced composite materials. The effective moduli of the material are modeled using a self-consistent scheme which includes the calculated energy dissipated through the opening of a crack in an arbitrarily oriented elliptical inclusion. The model is an extension of previous works which have modeled isotropic properties of short-fiber reinforced composites with fiber breakage and anisotropic properties of monolithic materials with microcracks. Two-dimensional planar composite systems are considered. The model allows for the calculation of moduli under varying degrees of fiber alignment and damage orientation. In the results, both aligned fiber systems and randomly oriented fiber systems with damage-induced anisotropy are examined.

Download Full-text