I performed quasi-static compression test simulation in Abaqus/Standard on a 3D-printed structure using PLA material, and compared the load-displacement curve with experiment results. I haven't found any reference with suitable material parameters to use so I adjusted the parameters to achieve simulation results as close as possible with the experiment. The parameters I currently use are Elastic, Plastic, Ductile Damage, and Damage Evolution. The comparison of the curves can be seen in the picture, the experiment results shown in orange and gray lines and the latest simulation result shown in blue line.

I have found several material parameters effect on the load displacement curve result (i.e the modulus young determines the linear phase, the yield stress determines at which point the curve got out of its linear phase, etc), but I can't seem to find parameter that could give longer curve in the phase toward the maximum load before the load dropped. What material parameters that could have influenced the length of said phase? I've tried to increase the plastic strain, but instead of giving longer curve, the analysis diverged earlier than when I applied normal plastic strain.