Experimental Study And Finite Element Simulation Of Recovery Mechanical Properties Of Articular Cartilage

With the development of social civilization,health is more and more sought after by people.However,high intensity exercise may inadvertently cause cartilage damage,especially in the absence of full recovery in the case of reexercise.As is known to all,the role of articular cartilage is to buffer the joint load,reduce the contact stress between the external force and the joint,and reduce the friction and wear of the joint.Therefore,it is of great practical significance to study the articular cartilage and to study the mechanical state of articular cartilage rebound.Prior to this,many achievements have been made in the research of articular cartilage.It includes the tensile,compression,defect and joint cartilage ratchet effect of articular cartilage.However,the study of articular cartilage rebound has not been reported.This paper is to explore: 1 Using advanced non-contact press,through different loading methods of experimental research.Then,combined with digital image correlation and post-processing,the effects of different loading on the micro mechanical properties of articular cartilage were investigated.2 It is the fiber structure of articular cartilage and its internal solid-liquid two-phase based on.Combined with some parameters obtained from previous experiments.Simplified modeling of articular cartilage using ABAQUS finite element analysis software.The springback simulation of articular cartilage under different load and different sustained compression time was simulated.The macro and micro mechanical properties of articular cartilage were obtained.3 Combined with the constitutive model of nonlinear viscoelastic material,the springback law is predicted.Compared with the experimental simulation results,a more accurate conclusion is obtained.The results show that the rebound performance of the different layers is quite different.When the superficial cartilage rebound rebound strain to reduce the magnitude of the maximum,intermediate level,deep minimum,strain 10%,6% respectively from 20%,down to 3% by the time the return time is longer,similar;cartilage strain variation on different layer region more slowly,but the final strain will be less than 1%.Under the same layer area under different compression loads,in the initial rebound,the greater the load,the faster the change of the cartilage rebound strain;in the late rebound,the smaller the load,the faster the rebound strain changes.The final load is small closer to the compression state.The influence of different continuous compression time and load on the same layer is similar.In addition,in the finite element simulation of articular cartilage based on fiber enhanced porous elastic model,the same loading mode was also performed.Simulation results are also obtained and compared with experimental results.And the two are consistent with the creep recovery phenomenon of viscoelastic constitutive model.The difference of elastic deformation in different layers of articular cartilage is closely related to its own structure.From the experimental data,articular cartilage in the first fifteen minutes about a rebound of 90%.he mechanical resilience of different layers of articular cartilage has a close relationship with the loading and the loading time.And compression time and compression load have similar effect.The increase of load and loading time will have adverse effect on spring back.From the late rebound data,after a certain period of time can be back to the state of the former.