Research On Axial Crushing Response Of Corrugated Structure

As a thin-walled multi-cell structure,the corrugated structure is widely used in the field of transportation and packaging due to its high rigidity to weight ratio.The structure has excellent energy absorption capacity when undergoing plastic deformation along the axial compression.Analyze its constituent elements-the folding type of the corner unit from the microstructure level,and analyze the deformation mode of the structure from the overall response hierarchy,and characterize the energy absorbed during the deformation process is the key to effectively use the corrugated structure for energy absorption.In this paper,the quasi-static axial crushing response of corrugated structure is studied based on theory and experiment.In addition,the corrugated structure with the same quality is optimized in shape and size to absorb more energy.The research content is summarized as follows:(1)Deformation of corner element and energy absorption during deformation.Firstly,study the deformation of the corner element through the triangular tube to understand the deformation of the corrugated structure.By analyzing the deformation mode of the triangular tube,we obtain the three folding types of the corner unit: A,B,and C.Among them,type B is a newly discovered folding type with the most energy absorption,but this type of deformation is not easy to occur.Then,take the non-ductile deformation of the corner element as an example to compare the accuracy of the three classical energy absorption theories to calculate the energy dissipated during the deformation of the corner element at different angles.(2)The axial crushing of the single-layer corrugated paperboard is explored experimentally and analytically.Quasi static compression experiment is conducted of the single wall corrugated paperboard,and a typical foldingelement is suggested based on the selection principle of the unit,including two corner elements and two panels.Then,a theoretical model is derived to predict the plateau stress of the single-layer corrugated paperboard.It is show that theprediction of plateau stress from the model compares well with the experimental results.(3)Research on quasi-static axial crushing response of multi-layer corrugated board.Through the axial compression experiments on multi-layer corrugated cardboard with different core paper layers and heights,it is found that the size affects the deformation mode by affecting the stability of the structure.The magnitude of the plateau stress corresponding to each deformation mode is: progressive folding> local distortion> overall distortion.And the effect of dimensional change on the plateau stress is characterized by the ration of height to width.The stress of the multi-layer corrugated cardboard plateau at the same height increases first and then decreases the increase of the ration of height to width.Then,a theoretical model is derived to predict the plateau stress of the multi-layer corrugated paperboard.It is show that theprediction of plateau stress from the model compares well with the experimental results.(4)Optimized design of corrugated thin-walled pipes.Using ABAQUS simulation software and the sequence response surface optimization method based on cubic spline interpolation to optimize the shape and size of corrugated structure thin-walled tubes with the same quality.The results show that the energy dissipation of the optimally configured corrugated thin-walled tube is increased by 34.9% compared to the average-sized corrugated thin-walled tube.And the optimal energy-absorbing configuration tends to increase the thickness of the core board while reducing the thickness of the panel and increasing the number of corner units.In addition,during the optimization process,it was found that the strength of the core plate to induce the panel is affected by the thickness of the core board and the panel.When the thickness of the core plate is greater than or equal to that of the panel,the core plate can induce the panel to bend layer by layer and the structure is deformed in a stable progressive folding mode.When the thickness of the core board is smaller than that of the panel,the inducibility is weakened and the structure is deformed in the overall distortion mode.