Experimental and numerical investigation of T‐joints with multiwalled carbon nanotubes

Abstract Combined experimental and numerical methods were used to study the mechanical properties of multiwalled carbon nanotubes (MWCNTs) enhanced composite T‐joints in this article. Herein, an enhanced interface model was created based on the interface mechanical properties with MWCNTs obtained by a flatwise tension test and a single‐lap shear test. Then, the finite element model of composite T‐joints with MWCNTs was developed with a cohesive zone model to study the damage initiation, evolution, and final failure process of T‐joints. Meanwhile, a quasi‐static tensile test of the T‐joints was carried out to compare with the numerical analysis results. The study results showed that the out‐of‐plane tensile strength and the in‐plane shear strength of MWCNTs enhanced composite increased by up to 26.3%(@3 g/m²) and 23.4%(@2 g/m²), respectively. The properties of the filler, which was the weakest part of the T‐joints, can be enhanced by adding MWCNTs. The overall bearing capacity of the T‐joints was 18.8%(@2 g/m² MWCNTs) increase under tensile loading. Predictions given by the FEM of composite T‐joints were in good agreement with the experimental results. This article provides a method for analyzing and predicting the complex composite structure enhanced with MWCNTs, which can be used for functional structure design.