Abstract
Abstract The normal stress along the shear plane has great effect on the composite intralaminar shear strength. However, the influence mechanism on composite interlaminar shear strength under the normal stress along the shear plane was not truly reflected by the double-notch shear experiment. In this paper, the interlaminar shear strength of composite specimens under different external normal stresses was first obtained using the improved double-notch shear experiment. Furthermore, to research the influence mechanism on interlaminar shear strength under normal stress along the shear plane, the characteristic curve method based on the double-notch shear specimen was studied. Finally, the experimental results analyzed by the characteristic curve method were compared with a range of failure criteria presented in the literature. The experimental data obtained in this study agreed best with the NU theory criterion, with a maximum numerical difference of 4%. And the NU theory criterion can reflect the influence mechanism of the composite interlaminar shear strength best.
Highlights
With the increasing use of composite for large load-bearing structures, the stress state of materials has become moreCurrently, the influence on interlaminar shear strength under normal stress is mainly focused on experimental research
To research the influence mechanism on interlaminar shear strength under normal stress along the shear plane, the characteristic curve method based on the double-notch shear specimen was studied
A study by Li et al showed that the bearing capacity of composite pre-tightened tooth connection could be effectively predicted by the characteristic curve method [16]
Summary
With the increasing use of composite for large load-bearing structures, the stress state of materials has become more. By the double-notch shear experiment, normal stress can be directly changed on the same type of experiment specimen, which effectively overcomes the shortcomings of experiment mentioned above. To further research the influence mechanism on composite interlaminar shear strength under the normal stress, the existing double-notch shear experiments were first improved and the external normal stress application device is simplified, which considerably reduced the requirements for the experiment machine. The hole diameter on the experiment specimen was slightly larger than the bolt diameter to ensure that the experiment specimen could rotate freely under the external load This would overcome the problem of clamping the end of the experiment specimen, and eliminate the influence of the bending moment on the experiment specimen.
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