Size effects in unnotched tensile strength of unidirectional and quasi-isotropic carbon/epoxy composites
Source abstract
Abstract
A series of fully scaled tests on unidirectional and quasi-isotropic carbon fibre-epoxy has been carried out. Unidirectional specimens showed a decreasing tensile strength with increasing specimen size, with a reduction of 14% over a factor of 8 change in linear dimension. Quasi-isotropic specimens increased in strength with size when the thickness was changed by repeating the sublaminate stacking sequence, with a 10% increase from a single to four stacked sublaminates. However, strength decreased when the thickness was increased by changing the ply block thickness, with a 62% reduction from 1 to 8 blocked plies. None of the laminates reached the equivalent strength of the unidirectional material, indicating that transverse cracking and edge delamination caused premature failure in all cases.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Mechanical Behavior of Composites · Fiber-reinforced polymer composites · Natural Fiber Reinforced Composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (15)
Show source-provided references
1. Size effects in the testing of fibre-composite materials10.1016/S0266-3538(99)00053-6 ↗
2. Cunningham ME, Schoulz SV, Toth JM. Effect of end tab design on tension specimen stress concentrations. In: Recent advances in composites in the United States and Japan, ASTM STP 864, 1985, p. 253–62.10.1520/STP32793S ↗
3. Influence of clamping method on tensile properties of unidirectional CFRP in 0° and 90° directions – round robin activity for international standardization in Japan10.1016/0010-4361(94)90139-2 ↗
4. Wisnom MR, Maheri MR. Tensile strength of unidirectional carbon fibre-epoxy from tapered specimens. In: Second European conference on composites testing and standardisation, Hamburg, 1994. p. 239–47.
5. Strength ratios of composite materials in flexure and in tension10.1177/002199837400800209 ↗
6. The effect of specimen size on the strength of cfrp10.1016/0010-4361(78)90590-6 ↗
7. Jackson KE, Kellas S. Effect of specimen size on the tensile strength of geometrically scaled [+θn/minusθn/902n]s composite laminates. In: US Army Symposium on Solid Mechanics, Plymouth MA, August 1993.
8. Reduction in tensile and flexural strength of unidirectional glass fibre-epoxy with increasing specimen size10.1016/S0263-8223(97)00075-5 ↗
9. Scale effects in the response and failure of fiber reinforced composite laminates loaded in tension and in flexure10.1177/002199839202601803 ↗
10. O’Brien TK. Characterisation of delamination onset and growth in a composite laminate. In: Reifsnider KL, editor. Damage in composite materials ASTM STP 775, 1982; p. 140–67.10.1520/STP34325S ↗
11. Scaling effects in sublaminate-level scaled composite laminates10.2514/2.384 ↗
12. Suppression of delamination at ply drops in tapered composites by ply chamfering10.1177/0021998305053459 ↗
13. Hallett SR, Jiang W, Khan B, Wisnom MR. Modelling the interaction between matrix cracks and delamination damage in scaled quasi-isotropic specimens. Compos Sci Technol 2007, in press. doi:10.1016/j.compscitech.2007.05.038.10.1016/j.compscitech.2007.05.038 ↗
14. O’Brien TK, Krueger R. Analysis of ninety degree flexure tests for characterization of composite transverse tensile strength. NASA TM-2001-211227 ARL-TR-2568, 2001.
15. A concise interface constitutive law for analysis of delamination and splitting in composite materials and its application to scaled notched tensile specimens10.1002/nme.1842 ↗