The results of a study of elastic-plastic stress analysis and plastic zone propagation in a low density polyethylene thermoplastic composite plate subjected to uniform transverse load are presented. Thermoplastic matrix, polyethylene (LDPE), and steel fibres were used to fabricate the composite plates. Yield points and elastic, elastic-plastic and residual stresses are calculated numerically for both symmetric and antisymmetric laminated plates with different ply orientations by using Finite Element Method. First order shear deformation theory was used as an equivalent single-layer laminate theory for small deformations. Contour plots corresponding to 100, 150 and 200 load steps display the expansion of the plastic zone. Mechanical properties of a layer were obtained experimentally.
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References
1.
1. Jegley, D.1993. "Impact-Damaged Graphite-Thermoplastic Trapezoidal-Corrugation Sandwich and Semi-Sandwich Panels,"Journal of Composite Materials, Vol. 27, No. 5, 526-538
2.
2. Cantwell, W. J.1996. "The Influence of Stamping Temperature on the Properties of a Glass Mat Thermoplastic Composite,"Journal of Composite Materials, Vol. 30, No. 11, 1266-1281.
3.
3. Shi, F. F.1996. "The Mechanical Properties and Deformation of Shear-Induced Polymer Liquid Crystalline fibre in an Engineering Thermoplastic,"Journal of Composite Materials, Vol. 30, No. 14, 1613-1626.
4.
4. Tayman, I. H.1996. "Thermal and Mechanical Properties of Aluminum Powder Filled High Density Polyethylene Composites,"J. of Applied Polymer Science, Vol. 62, 2161-2167.
5.
5. Lee, W. I. and Springer, G. S.1987. "A Model of the Manufacturing Process of Thermoplastic Matrix Composites,"Journal of Composite Materials, 21:1017-1017.
6.
6. Astrom, B. T. and Pipes, R. B.1991. "Modeling of a Thermoplastic Pultrusion Process,"SAMPE Quarterly, July, p. 55-55.
7.
7. Lee, W. I., Springer, G. S. and Smith, F. N. 1991. "Pultrusion of Thermoplastics,"36th International SAMPE Symposium, April 15-18. p. 1309-1309.
8.
8. Van West, B. P., Pipes, R. B. and Advani, S. G.1991. "The Consolidation of Commingled Thermoplastic Fabrics,"Polymer Composites, 12(6):417-417.
9.
9. Ranganathan, S. and Advani, S. G.1995. "A Non-Isothermal Process Model for Consolidation and Void Reduction during in-situ Tow Placement of Thermoplastic Composites,"Journal of Composite Materials, Vol. 29, No. 8, 1040-1062.
10.
10. Mahieux, C. A., Russell, B. E. and Reifsnider, K. L.1998. "Stress Rupture of Unidirectional High Performance Thermoplastic Composites in End-Loaded Bending at Elevated Temperatures. Part I: Experimental Characterization of the Failure Mode,"Journal of Composite Materials, Vol. 32, No. 14, 1311-1321.
11.
11. Akay, M. and Ozden, S.1996. "Prediction of Process Induced Warpage in Injection Molded Thermoplastics,"Polymer Engineering and Science, Vol. 36, No. 13, 1839-1846.
12.
12. Wen, Y F., Gibson, R. F. and Sullivan, J. L.1997. "Prediction of Momentary Transverse Creep behaviour of Thermoplastic Polymer Matrix Composites Using Micromechanical Models,"Journal of Composite Materials, Vol. 31, No. 21, 2124-2145.
13.
13. Sun, C. T., Chung, I. and Chang, I. Y.1993. "Modeling Creep in Thermoplastic Composites,"Journal of Composite Materials, Vol. 27, No. 10, 1009-1029.
14.
14. Cervenka, A.1998. "Advantages and Disadvantages of Thermoset and Thermoplastic Matrices for Continuous Fibre Composites,"Mechanics of Composite Materials and Structures, NATO Science Series E: Applied Sciences, Vol. 361, 289-297.
15.
15. Hahn, H. T.1976. "Residual Stress in PolymerMatrix Composite Laminates,"Journal of Composite Materials, Vol. 10, 265-277.
16.
16. "Determining Residual Stress by the Hole-Drilling Strain Gage Method,"ASTM Standard E8376-81, Philadelphia (1981).
17.
17. "Measurement of Residual Stresses by the Hole-Drilling Strain Gage Method," Tech. Note TN-503-3, Measurements Group, 1-15 (1988).
18.
18. Nicoletto, G.1991. "Moire Interferometry Determination of Residual Stresses in the Presence of Gradients,"Experimental Mechanics, Vol. 31, No. 3, 252-256.
19.
19. Schajer, G. S. and Yang, L.1994. "Residual Stress Measurement in Orthotropic Materials Using the Hole-Drilling Method,"Experimental Mechanics, Vol. 34, No. 4, 324-333.
20.
20. Gascoigne, H. E.1994. "Residual Surface Stresses in Laminated Cross-Ply fibre-Epoxy Composite Materials,"Experimental Mechanics, Vol. 34, No. 1, 27-36.
21.
21. Ifju, P. G., Kilday, B. C., Niu, X. and Liu, S-C.1999. "A Novel Method to Measure Residual Stresses in Laminated Composites'Journal of Composite Materials, Vol. 33, No. 16, 1511-1524.
22.
22. Jeronimidis, G. and Parkyn, A. T.1998. "Residual Stresses in Carbon Fibre-Thermoplastic Matrix Laminates,"Journal of Composite Materials, Vol. 22, No. 5, 401-415.
23.
23. Domb, M. M. and Hansen, J. S.1998. "The Effect of Cooling Rate on Free-Edge Stress Development in Semi-Crystalline Thermoplastic Laminates,"Journal of Composite Materials, Vol. 32, No. 4, 361-385.
24.
24. Akay, M. and Ozden, S.1994. "Measurement of Residual Stresses in Injection Moulded Thermoplastics,"Polymer Testing, Vol. 13, 323-354.
25.
25. Owen, D. R. J. and Figuerias, J. A.1983. "Anisotropic Elasto-Plastic Finite Element Analysis of Thick and Thin Plates and Shells,"International Journal for Numerical Methods in Engineering," Vol. 19, 541-566.
26.
26. Karakuzu, R. and Sayman, O.1994. "Elasto-Plastic Finite Element Analysis of Orthotropic Rotating Discs with Holes,"Computers and Structures, Vol. 51, No. 6, 695-703.
27.
27. Karakuzu, R., Ozel, A. and Sayman, O.1997. "Elasto-Plastic Finite Element Analysis of Metal-Matrix Plates with Edge Notches,"Computers and Structures, Vol. 63, No. 3, 551-558.
