Numerical Analysis and Experimental Validation of Interlaminar Stresses of Quasi-isotropic APC-2/AS-4 Laminate with a Central Hole Loaded in Tension

Abstract

This article addresses the distributions of interlaminar stresses of centrally notched quasi-isotropic APC-2/AS-4 laminate ([0/±45/90]_2s) in tension by finite element method (FEM). Results include the concentration of interlaminar stresses in the vicinity of free boundaries (including hole edge and free sides); The concentration of interlaminar shear stress dominates at interfaces of -45°/+45° and +45°/0°, and the concentration of interlaminar normal stress, which occurs at the 90°/-45° and 0°/90° interfaces. Further analysis demonstrates that the concentration of interlaminar shear stress is more severe as a whole and the highest interlaminar shear stress occurs near the hole edge. The results of digital speckle correlation measurement experiment validate the FEM result.

Keywords

thermoplastic composite quasi-isotropic laminate interlaminar stress 3D elastoplastic FEM.

References

Jones, R.M. ( 1975). Other Analysis and Behavior Topics, Mechanics of Composite Materials, Scripta Book Co., Washington , USA, pp. 331-362.

Awerbuch, J. and Madhukar, M.S. ( 1985). Notched Strength of Composites Laminates: Prediction and Experiments-A Review, J. Reinf. Plast. Comp., 4(3): 3-159.

Camanho, P.P. and Matthews, F.L. (1997). Stress Analysis and Strength Prediction of Mechanically Fastened Joints in FRP: A Review, Composites, Part A, 28(6): 529-547.

Tan, S.C. (1987). Tensile and Compressive Notched Strength of PEEK Matrix Composite Laminates, J. Reinf. Plast. Comp., 6(3): 253-266.

Carlson, L.A. , Aronsson, C.G. and Bäcklund , J. (1989). Notch Sensitivity of Thermoset and Thermoplastic Laminates Loaded in Tension , J. Mater. Sci., 24(5): 1670-1682.

Guynn, E.G. and Bradley, W.L. ( 1989). A Detailed Investigation of the Micromechanisms of Compressive Failure in Open Hole Composite Laminates, J. Comp. Mater. , 23(5): 479-504.

Vautey, P. and Favre, J.P. ( 1990). Fibre/Matrix Load Transfer in Thermoset and Thermoplastic Composites-Single Fibre Models and Hole Sensitivity of Laminates, Compos. Sci. Technol., 38(2): 271-288.

Paul, T.K. and Rao, K.M. ( 1995). Finite Element Stress Analysis of Laminated Composite Plates Containing Two Circular Holes Under Transverse Loading, Comput. Struct., 14(4): 671-677.

Aymerich, F. and Found, M.S. ( 2000). Response of Notched Carbon/PEEK and Carbon/ Epoxy Laminates Subjected to Tension Fatigue Loading, Fatigue Fract. Eng. Mater. Struct., 23: 675-685.

10.

Mariatti, M. , Nasir, M. and Ismail, H. (2001). The Effects of Hole Locations and Hole Sizes on Damaged Behavior of Woven Thermoplastic Composites, Polymer Testing, 20(2): 179-189.

11.

Ding, S.R. , Tong, J.W. and Shen, M. ( 2005). Three Dimensional Elasto-plastic Stress Analysis of Thermo-plastic Composites with a Hole, Chin. Quart. Mech., 26(2): 310-315.

12.

Joo, J.W. and Sun, C.T. (1992). A Failure Criterion for Laminates Governed by Free Edge Interlaminar Shear Stress, J. Compos. Mater., 26(10): 1510-1522.

13.

Lee, J.W. and Daniel, I.M. (1990). Progressive Transverse Cracking of Crossply Composite Laminates, J. Compos. Mater. , 24(11): 1225-1243.

14.

Ding, S.R. , Tong, J.W. and Shen, M. ( 2005). The Three-dimensional Elastic-plastic Analysis of Interlaminar Stresses in Notched Thermoplastic Composites, J. Reinf. Plast. Compos., 24(11): 1151-1158.

15.

Gates, T.S. and Sun, C.T. ( 1991). Elastic/Viscoplastic Constitutive Model for Fiber Reinforced Thermoplastic Composites, AIAA J., 29(3): 457-463.

16.

Yoon, K.J. and Sun, C.T. ( 1991). Characterization of Elastic-Viscoplastic Properties of an AS4/PEEK Thermoplastic Composite, J. Compos. Mater., 25(10): 1277-1296.

17.

Sun, C.T. and Chen, J.L. (1989). A Simple Flow Rule for Characterizing Nonlinear Behavior of Fiber Composites, J. Compos. Mater, 23(10): 1009-1020.

18.

Chen, J.L. and Sun, C.T. ( 1993). A Plastic Potential Function Suitable for Anisotropic Fiber Composites, J. Compos. Mater., 27(14): 1379-1390.

19.

Weeks, C.A. and Sun, C.T. (1998). Modeling Non-linear Rate-dependent Behavior in Fiber-reinforced Composites, Compos. Sci. Technol., 58(3): 603-611.

20.

Yamaguchi, I. (1981). Speckle Displacement and Deformation in the Diffraction and Image Fields for Small Object Deformation, Opt. Acta, 28(10): 1359-1376.

21.

Peters, W.H. and Ranson, W.F. (1982). Digital Imaging Techniques in Experimental Mechanics, Opt. Eng., 21(3): 427-431.