The Effect of Curing Conditions and Fiber End Shapes on the Mechanical Properties of Composites

Abstract

The study consists of two main experimental parts. The aim of the first part of the study is to investigate the effects of the straight-short steel fibers and different curing conditions on the mechanical properties of the selected composite specimens. For this purpose, unreinforced (no fiber) specimens cured at room temperature (∼20°C) and the straight-short steel fiber reinforced polyester—calcite composite specimens cured at room temperature and at different curing conditions of 40, 80, and 120°C for 4, 8, and 12 h, have been subjected to tensile tests. In the second part of the study, unreinforced specimens and polyester—calcite composite specimens with straight-short, woven, and three different end shaped fibers cured at room temperature have been tested according to the four-point bending test procedure so as to obtain the effects of the end shapes on the mechanical properties of the composite specimens.

Keywords

straight-short fiber various end shaped fibers cure conditions.

References

Liou, W.J. ( 1997). Stress Distributions of Short Fiber Composite Materials , Computers and Structures, 62(6): 999-1012.

Smith, E.H. ( 1994). Mechanical Engineer’s Reference Book, Oxford: Buttenworth-Heinemann.

Zhu, Y.T. , Beyerlein, I.J. , Valdez, J.A. and Lowe, T.C. (2001). Fracture Toughness of a Composite Reinforced with Bone-shaped Short Fibers, Materials Science and Engineering, A317: 93-100.

Zhu, Y.T. , Valdez, J.A. , Beyerlein, I.J. , Zho, S.J. , Liu, C. , Stout, M.G. , Butt, D.P. and Lowe, T.C. ( 1999). Mechanical Properties of Bone-Shaped-Short-Fiber Reinforced Composites, Acta Mater., 47(6): 1767-1781.

Beyerleina, I.J. , Zhu, Y.T. and Mahesh, S. (2001). On the Influence of Fiber Shape in Bone-shaped Short-fiber Composites, Composites Science and Technology, 61: 1341-1357.

Zhu, Y.T. and Beyerlein, I.J. (2002). Bone-shaped Short Fiber Composites-an Overview, Materials Science and Engineering , A326: 208-227.

Zhu, Y.T. , Valdez, J.A. , Shi, N. , Lovato, M.L. , Stout, M.G. , Zhou, S.J. , Butt, D.P. , Blumenthal, W.R. and Lowe, T.C. (1998). A Composite Reinforced with Bone-Shaped Short Fibers, Scripta Materialia, 38(9): 1321-1325.

Beyerlein, J. , Zhu, Y.T. and Mahesh, S. (2001). On the Influence of Fiber Shape in Bone-shaped Short-fiber Composites, Composites Science and Technology, 61: 1341-1357.

Bagwell, R.M. and Wetherhold, R.C. (2005). End-Shaped Copper Fibers in an Epoxy Matrix-Predicted Versus Actual Fracture Toughening, Theoretical and Applied Fracture Mechanics, 43: 181-188.

10.

Zhou, Y. , Li, C. , Renaud, J.E. and Mason, J.J. ( 2005). Improvement of the Mechanical Properties of Bone Cement by Shape Optimization of Short Fibers, Engineering Optimization , 37(2): 121-134.

11.

Zhou, Y. , Li, C. and Mason, J.J. ( 2005). Shape Optimization of Randomly Oriented Short Fibers for Bone Cement Reinforcements, Materials Science and Engineering A, 393: 374-381.

12.

Jiang, H. , Valdez, J.A. , Zhu, Y.T. , Beyerlein, I.J. and Lowe, T.C. ( 2000). The Strength and Toughness of Cement Reinforced with Bone-shaped Steel Wires, Composites Science and Technology , 60: 1753-1761.

13.

Glass Fibre Co. Catalog of resine and fibre . Kocaeli, 1997.

14.

Standard Test Method for Tensile Properties of Plastics, ASTM D638-91, 1991.

15.

Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials, ASTM D790-92, 1992.