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Abstract

The significance of bi-axial testing is increasing with the use of composites in more complex applications and the advent of new manufacturing techniques (Ash and Welsh. Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 2004, vol. 2, pp.1402–1412). Existing failure theories have not been proven to be accurate for predicting failure for laminated composites and very limited test data are available for woven composites (Ash and Welsh. Collection of Technical Papers – AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 2004, vol 2, pp.1402–1412). It is believed that the fabrication process used to make composite bi-axial specimens induces initial damage into the specimen (Smits. Exp Anal Nano Eng Mater Struct 2007; 35: 933–934). Two different methods were developed to reduce the amount of damage induced into a bi-axial tests specimen. In addition, the effect of stress concentration due to a center hole added to a composite bi-axial specimen is studied.

Keywords

Bi-axial testing composites testing cruciform center hole

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References

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The development of a modified bi-axial composite test specimen

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