Numerical Study On Buckling Of Composite Bars Under The Impact Of Rigid Mass

As the most commonly used basic components in engineering structures,composite bars are widely used in large machinery,aerospace,weaponry and other fields due to their high strength?stiffness and good fatigue resistance.Because the bars is often impacted to axial buckling and other dynamic buckling in engineering practice,the dynamic buckling of composite bars has attracted the attention and research of researchers.With the development of science and technology,the buckling problem caused by collision gradually enters people's field of vision.Therefore,the dynamic buckling study of rigid masses axial impact composite bars has a strong engineering application background,but due to the complexity of stress wave effect the research is not sufficient.This paper does the following works based on this1.This paper briefly describes the research status of dynamic buckling of composite bars,and focuses on the research of composite bars dynamic buckling.Based on this,the research methods and results of composite bars dynamic buckling problems and the imsufficiency of existing research are summarized.2.Considering the stress wave effect,based on the first-order shear theory,the dynamic buckling of composite bars control equations of composite bars are derived according to the Hamilton's principle,and control equations are non-dimensionalized.The dimensionless control equations are solved by the difference method and solved by MATLAB software.3.Consider the stress wave effect and axial inertia.The effects of critical length,impact velocity,layup angle and impact mass on the dynamic buckling of composite bars under different boundary conditions before and after reflection of stress wave reflection are discussed.The results show:critical length,impact velocity,impact mass and layup angle change have significant effects on the dynamic buckling of composite bars.Specifically,the maximum peak w_max,the trough w_min value increase,the buckling mode number increases,and the maximum half wavelength changes.After the stress wave is reflected,it is basically consistent with the influence before reflection,but due to the superposition of the stress wave at the reflection end,the value of the critical velocity and critical mass before reflection is smaller.Changes in boundary conditions do not affect dynamic buckling,but can cause changes in the buckling waveform.4.The relationship between stress wave before and after reflection impact velocity,impact mass and critical length is studied separately.The results show that the critical length decreases with the increase of critical velocity,the critical velocity decreases with the increase of critical mass,and the critical mass decreases with the increase of critical velocity.After reflection,it is consistent with the law before reflection,but the curve after reflection is relatively flat.5.As the layup angle increases,the peaks and troughs of the buckling waveform increase,indicating that the layup angle has a significant effect on the buckling of the composite bar.6.The dynamic buckling of the composite bar under the axial impact of the rigid mass was simulated using ABAQUS 6.1.3 finite element software.The buckling waveforms of the composite bar subjected to the axial impact of the rigid masses before and after the reflection of the stress wave are obtained.The effects of different impact velocities,impact masses,critical lengths and layup angles on the dynamic buckling of the composite bar are analyzed.The results are compared with the results obtained by the difference decomposition.The results show that the maximum peak w_max and the maximum trough value w_minin are basically consistent with the results obtained by the difference method.The waveforms of the simulated buckling waveforms and the differentially obtained waveforms are basically the same and the values are basically the same.It is shown that the differential decomposition can be effectively applied to the study of dynamic buckling of axial impact composite bars with rigid mass.