Study On Dynamic Performance Of Plant Fiber Mattress

Palm fiber mattress is an environmentally friendly plant fiber mattress.People’s research on palm fiber mattress is still in the basic stage,taking the statics research of the mattress as the main direction,but in real life,mattress is often subjected to dynamic load.Therefore,it is necessary to systematically study the dynamic properties of palm fiber mattress.In this paper,the dynamic performance of palm fiber mattress is deeply studied,and the fatigue and impact experiment are carried out to further understand the damage mechanism of the mattress.Based on mechanics,this paper studies the material properties of palm fiber mattress by combining experiment and finite element simulations.Firstly,by simulating human load,repeated compression fatigue experiments were carried out on mattress test blocks to study the compression fatigue performance of palm fiber mattress,simulating the external force of human sleep on the mattress for 8 hours a day,and studying different loads,mattress sizes and the influence of loading times on the compression fatigue properties of palm fiber mattress,and the stress-strain curve and the deformation of mattress test blocks of palm fiber mattress were analyzed.Secondly,the low-speed impact experiment was carried out on the combined palm fiber mattress,and the impact experiment was carried out in the form of penetrate impact and flat impact to study the impact performance and energy absorption characteristics of the combined palm fiber mattress.The impact experiment was carried out on different positions of palm fiber mattress,the impact performance of different mattress parts was studied,and the impact damage at different positions of palm fiber mattress was analyzed.Finally,according to the results of the impact experiment and fatigue experiment,the finite element model of the palm fiber mattress is established,and the finite element software is used to perform the compression fatigue and impact finite element simulation,and the data obtained from the experiment and the finite element simulation are analyzed and compared and verified.Base on fatigue experiment,impact experiment and finite element analysis of palm fiber mattress,the following conclusions are drawn:(1)In the compression fatigue experiment,the thickness variation rule of the palm fiber mattress before and after the experiment was obtained.The linear relationship between the deformation and the thickness of the mattress under different load is calculated.Under the same conditions,70 mm mattresses with different thicknesses have the best anti-compression fatigue performance and energy dissipation capacity.(2)In the penetration impact experiment,the impact properties of the combined palm fiber mattress materials are similar.The energy absorption rate of the combined mattress is higher than that of the palm fiber mattress,the latex/palm fiber mattress has the best energy absorption performance,followed by the sponge/palm fiber mattress,corn/palm fiber mattress,sisal/palm fiber mattress.Under the same conditions,the impact force peak value of the corn/palm fiber mattress obtained from the experiment is the largest,and the impact force peak value of the sisal/palm fiber mattress is the smallest.(3)In the flat impact experiment,the peak value of the impact force of the combined palm fiber mattress is proportional to the number of impacts.At the first impact,the foam/palm fiber mattress had the lowest impact peak,and the latex/palm fiber mattress had the highest impact peak.When impact 20 times,the sisal/palm fiber mattress had the lowest peak impact and the latex/palm fiber mattress had the highest peak impact.The corn/palm fiber mattress has the best energy absorption performance under multiple flat impacts.(4)In the impact experiment at different location,under the same size,the energy absorption rate at the center of the mattress is always greater than that at the edge of the mattress.The peak impact force in the center is lower than the edge,and the impact resistance of the center of the mattress is better than that of the edge.(5)For the palm fiber mattress whose material properties are transversely isotropic materials,the fatigue finite element analysis is compared with the experimental data linear fitting,and the final difference is 2.657%.The finite element results of different positions are consistent with the experimental results,and the impact resistance of the center position of the mattress is better,and impact damage is not easy to occur.