ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Tensile performance of composites' hat stiffener reinforced wall joint by Z-pin
Received date: 2015-07-20
Revised date: 2015-08-13
Online published: 2015-09-25
Supported by
National Basic Research Program of China (2014CB046501);Aeronautical Science Foundation of China (2015ZE52049);A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions
To enhance the joint strength on interface between the skin and the stiffener of polymer composites' hat stiffener wall structure, the 3D reinforcing technology of Z-pin is used for hat stiffener wall joints. Hat joint specimens reinforced with different configurations of Z-pin are manufactured and tested by tensile, the mechanism reinforced with Z-pin is analyzed and the effects of the volume fraction, diameter of the Z-pin and load span on the joint performance on interface between the skin and the stiffener are investigated. It turns out:when Z-pin's diameter is 0.5 mm and implant angle is 90°, the joint strength increases with Z-pin volume fraction increasing from 0% to 1.0%, but its increase trend slows down with Z-pin volume fraction increasing, the strength of hat joint with Z-pin fraction of 1.0% is higher than that without Z-pinned by 31.1%, thus the Z-pinned hat joints pull-off strength decreases with Z-pin volume fraction from 1.0% to 1.5%. The effect of the diameter of Z-pin on the pull-off strength of hat joint is not significant. With the increasing of the load span, the pull-off strength of hat joints reinforced with Z-pin fraction of 0.5% (diameter of 0.5 mm) decreases with the failure model transforming.
Key words： polymer composites; hat joints; Z-pin; joint performance; tensile test
LI Wen , LI Yong , HUAN Dajun , CHU Qiyi , CHEN Haoran . Tensile performance of composites' hat stiffener reinforced wall joint by Z-pin[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(6) : 2003 -2012 . DOI: 10.7527/S1000-6893.2015.0259
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