Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
EVALUATING THE VISCOELASTIC LOAD SHARE OF PORCINE KNEE LIGAMENTS
Submission Author:
Paulo Pedro Kenedi , RJ , Brazil
Co-Authors:
Bruno Mello Silveira, Paulo Pedro Kenedi
Presenter: Bruno Mello Silveira
doi://10.26678/ABCM.COBEM2023.COB2023-1093
Abstract
An analytical model of load share of porcine knee ligaments, statically loaded, is presented. The proposed model includes the viscoelastic behavior of the ligaments, which can be considered an evolution, in comparison with the most literature available models, based on an elastic constitutive approach. The proper mechanical description of the knee ligaments relies on the right modeling of their constitutive relationships. To accomplish this primary objective, a series of relaxation experimental tests were conducted using the following porcine knee ligament specimens: lateral collateral ligament (LCL), anterior cruciate ligament (ACL), posterior cruciate ligament (PCL) and medial collateral ligament (MCL). The results of these relaxation experimental tests were processed by software, using Schapery’s equations. The Schapery’s model constants, thus obtained, were used to describe the constitutive relationships of the knee porcine ligaments, which are applied in the proposed load share model. Preliminary results show that although load share rearrangement after the viscoelastic phase was quite discrete, the remaining load capacity in the ligaments can drop to less than half of their initial value. This fact can, probably, explain why operated knee ligaments, which are tight just after surgical operations, can build an unstretched state, in a couple of weeks.
Keywords
knee ligaments, analytical model, viscoelasticity, load share
