PENGARUH ARAH SERAT TERHADAP FAKTOR INTENSITAS TEGANGAN PADA UNIDIRECTIONAL LAMINA YANG MENGANDUNG CENTER CRACK
Abstract
This paper presents the stress intensity factor (SIF) analysis for unidirectional fiber-matrix lamina containing center crack under uniaxial loading. Several variables are considered on the inuence to the stress intensification factor i.e. fiber direction,θ, crack dimension parameter, 2a/L, fiber and matrix volume fraction, Vf, Vm, fiber and matrix stiffness ration, Ef/Em, and lamina thickness. The stress-strain equations for the lamina are derived using micromechanic approach. The governing equations are solved numerically using the finite element method with triangular type element. The element stifiness matrix is obtained using the polynomial shape functions. The software to calculate stress-strain in the lamina containing center crack is developed. Case studies jor numerical purposes consider the carbon-epoagz lamina with carbon type P-100. Numerical results for carbon epoxy lamina are presented in graphical form of SIF as a fimction of the fiber direction, fiber matrix stifihess ratio and volume ratio, and crack geometry.
References
Adams,D.F., 1974, "Elastoplastic Crack Propagation in a Transversely Loaded Unidirectional Composite" , Journal of Composite Material, Vol.8, pp. 38-54.
ASTM Standard for Composite Materials, Vol.1 Daniel, Isaac M., and Ishai, Ori, 1994, Engineering Mechanics of Composite Materials, Oxford University Press.
Gibson, Ronald F., 1994, Principles of Composite Material Mechanics, McGraw-Hill .
Goree, J.G., ang Gross, R.S., 1979, "Analysis of a Unidirectional Composite Containing Broken Fibers and Matrix Damage" , Engineering Fracture Mechanics, Vol.13, pp. 563-578.
Griffith, A.A., 1920, "The Phenomena of Rupture and Flow in Solids" , Philosophical Transactions of the Royal Society, Vol 221A, pp. 163-198,
Hermann, K.P., 1987, "Thermal Crack Growth in Self-Stressed Glassy Compounds" , Fracture of Non-Metallic Materials, eds, K.P. Herrmann and L.H. Larsson, Brussels and Luxemburg, 1987, pp. 181-205.
Irwin, G.R., 1949, Fracturing of Metals, American Society of Metals, Ohio
Kwon, Y.W., 1992, "Analysis of Composite Plates Containing Cracks" , Journal of Pressure Vessel Technology, Vol. 114, pp.358-363.
Logan, Daryl L., 1986, A First Course in The Finite Element Method, PWS Engineering, Boston.
Peterson, R.E., 1974, Stress Concentration Factors, John Wiley & Sons, 1974.
Puja, I.W., Soemantri, S. Riyanto, B. 1998, "Pengaruh Arah Serat dan Susunan Lapisan terhadap Faktor Konsentrasi Tegangan pada Komposit . Laminate Carbon/Epoxy AS4/3501-6 Berlubang Lingkaran dan Ellips" , Jurnal Mesin, Vol.XII No.2, pp.39-47.
Reedy, E.D., Jr., 1980, "Analysis of Center-Notched Monolayers With Aplieation to Boron/Alurnunium Composite" , Journal of the Mechanics of Physics and Solids, Vol. 28, pp. 265-286.
Sih, G.C., 1973, Mechanics of Fracture l: Methods of Analysis and Solutions of Crack Problems, Noordhoff International Publishing, Leyden, The Netherlands.
