ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Performance of Polymer Composite Single Lap Joints Reinforced by Z-pin
Received date: 2013-07-23
Revised date: 2013-09-20
Online published: 2013-09-24
Supported by
Military Product Item (JPPT-1146)
To enhance the performance of polymer composite single lap joints, the joints reinforced with different configurations of Z-pins are manufactured and tested. The effects of the volume fraction, diameter and implant angles of the Z-pins on the strength of single lap joints are investigated and their reinforcing mechanism is also analyzed. The study finds that the Z-pin can improve the performance of single lap joints significantly: When the Z-pin's diameter is 0.5 mm and the implant angle is 90°, the joint's strength increases linearly with the Z-pin volume fraction from 0% to 3.0%. The maximum strength is 16.76 MPa with a 3.0% Z-pin fraction, which is 33.2% higher than that without Z-pin. It also reveals that the Z-pin's diameter has little influence on the strength of polymer composite single lap joints while the Z-pin fraction is 1.5% and the angle is 90°. The strength and failure model is strongly dominated by the implant angles of the Z-pin (against the joint edge) for a Z-pin fraction of 1.5% with a diameter of 0.5 mm. With the increase of the implant angles, the failure mode of the joint is transformed from Z-pin pulling out to Z-pin shearing. The strength reaches its peak value of 21.04 MPa at 40°, which is 67.1% higher than that without Z-pin. The implant angles of the Z-pin (along the joint edge) have no influence on its strength and failure mode.
DONG Xiaoyang , LI Yong , ZHANG Xiangyang , XIAO Jun , LI Wen . Performance of Polymer Composite Single Lap Joints Reinforced by Z-pin[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(5) : 1302 -1310 . DOI: 10.7527/S1000-6893.2013.0398
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