Applied Exploration Of A New Type Of Mixed Cellular Material With Soft Matrix (ACF) In The Packaging Of Fragile Goods

Soft matrix mixed cellular material belongs to a type of polymer foam materials,which matrix is soft polymer material.The matrix becomes light and soft after foaming,which brings it with good cushioning performance,good durability and high plasticity,its buffering,shock absorption,heat preservation and other capabilities are also excellent.The soft matrix mixed cellular material has widely used in product transportation packaging nowadays.The application of the soft matrix mixed cellular material is beneficial to protect the product,also to reduce packaging materials and improve the logistics efficiency.In recent years,a new type of soft-matrix mixed cellular material-artificial cartilage foam(ACF for short)has emerged in the industrial field with more outstanding cushioning properties.This material is expected to be used in packaging cushioning.It’s necessary to make analysis to understand its dynamic response under shock and vibration during product transportation,and to guide its shock and vibration design.In this paper,a comparative drop test of ACF,EPE,and EVA is carried out,and the cushioning properties of this three types of materials are compared and explored.For the ACF-bracelet packaging unit,the sine frequency sweep test was carried out first,and the frequency domain curve of the sweep frequency vibration was obtained,which helps us to learn its resonance characteristics.Afterwards,the random vibration test of the modified ASTM truck transportation spectrum excitation by three vibration levels(0.404 g,0.542 g,0.698g)was carried out on the ACF-bracelet packaging unit,and the time domain and frequency domain acceleration responses of the product were obtained.The random vibration comparison test of ACF,EPE and EVA pads with the same thickness confirms the vibration isolation performance of ACF.At the same time,it is found that the PSD response curves of ACF material and EVA material are similar.By comparing the random vibration time-domain signals of ACF pads with different thicknesses,it is found that the random vibration response during the random vibration process will have a sudden change,and this phenomenon increases with the increase of material thickness and the vibration intensity.By frequency domain analysis,it is found that the product acceleration response of the ACF liner package under the excitation of the modified ASTM trucking spectrum is mainly controlled by the first-order resonance frequency,and increasing the thickness of pads has no obvious effect on the peak PSD response of the product,boundary effects exists in the increase of the thickness.Finally,the static compression test of ACF is carried out to obtain its static compression strain curve and young’s modulus parameters,which are used for simulation analysis.This paper uses LS-DYNA nonlinear finite element software to simulate the random vibration experimental process for simulation analysis,and compares the simulation and experimental results.At the same time,the equivalent stress distribution of the package is extracted by finite element method.A reliable random vibration simulation model is established by the finite element method,which can break through the limitations of the experiment,which can take positive significance to study the dynamic response of packaging parts and guiding packaging design..