This paper deals with stresses around quasi-rectangular holes with minimum stress concentration in large orthotropic plates. The method given by Lekhnitskii is used. Numerical results are presented in terms of quasi-rectangular hole shapes with minimum stress concentration and stress distribution around these holes. Unidirec tional carbon/epoxy orthotropic composite materials are considered for a range of hole shapes under uniaxial and biaxial loading conditions.
Get full access to this article
View all access options for this article.
References
1.
Rajaiah, K. and Naik, N.K. "Optimum Hole Shape Determination in Infinite Orthotropic Plates under Inplane Loading by Conformal Transformation," Mech. Res. Comm. , Vol. 9, pp. 179-185, 1982.
2.
Lekhnitskii, S.G. "Anisotropic Plates," Gordon and Breach Science Publishers, New York, 1968.
3.
Savin, G.N.Stress Distribution Around Holes, NASA Technical Translation, NASA TT F-607, Nov. 1970.
4.
Durelli, A.J. and Rajaiah, K. "Quasi-square Hole with Optimum Shape in an Infinite Plate Subjected to Inplane Loading," J. Mech. Design , Vol. 103, pp. 866-870, 1981.
5.
Durelli A.J. and Rajaiah, K. "Lighter and Stronger," Expt. Mech.,, Vol. 20, pp. 369-380, 1980.
6.
Dhir, S.K. "Optimization in a Class of Hole Shapes in Plate Structures," J. Appl. Mech., Vol. 48, pp. 905-908, 1981, (Also see discussion on this paper by K. Rajaiah and N.K. Naik—To appear in J. Appl. Mech.).
7.
Rajaiah K. and Naik, N.K.Optimum Quasi-Rectangular Holes in Infinite Orthotropic Plates under Inplane Loading, Communicated as a brief note.
8.
Jong, Theo De "Stresses Around Rectangular Holes in Orthotropic Plates," J. Composite Materials, Vol. 15, pp. 311-328, 1981.
9.
Greszczuk, L.B. "Stress Concentrations and Failure Criteria for Orthotropic and Anisotropic Plates with Circular Openings," Composite Materials: Testing and Design, II Conference, ASTM STP497, pp. 363-381, 1972.
10.
Jones, R.E. "Mechanica of Composite Materials," McGraw-Hill Kogakusha, Ltd., Tokyo, 1975.
11.
Peterson, R.E. "Stress Concentration Factors," John Wiley and Sons, Inc., New York, 1974.
12.
Rajaiah K. and Naik, N.K. "An Analytical Approach for the Optimization of the Hole Shapes in CFRP Orthotropic Composite Plates," Paper Presented at the 34th AGM, Ae. S. I., Madras , Dec. 1982.
