I am currently conducting my final year project at my college on (compression analysis of PLA material auxetic structure) on UTM machine and validating it's results with the abaqus simulation results.After entering all the desired properties and defining all the required parameters in abaqus my load-displacement graph does not matches with the experimental graph.The nature of graph resembles with the experimental but the value have a drastic difference for example my peak force in experimental graph is 900N for same compression my peak force in abaqus is coming out to be 4.5N. what could be the solution for this problem?

The material properties used are as follows:-

Elastic-2315mpa, poissons ratio-0.35 , density:- 1.24 tonnes/mm3 and the plasticity property obtained from tensile test of pla material.