Abaqus Riks Buckling analysis

[engineleah]

In a nutshell I am trying to determine the buckling load at which my model will fail, I understand that the Riks analysis generates LPF values at each time increment and this factor multiplied by the applied load gives the buckling load. What I need to confirm is how do I find the LPF at which buckling occurs?

Currently I go into History Output and click 'Load proportionality factor: LPF for Whole Model' to display the LPF vs Arc Length graph. Then I go into job diagnostics to determine at what arc length the first negative Eigen value occurs (the point at which there is a loss of stiffness, i.e. buckling) using this arc length I then find the coreesponding LPF value from the graph. I then multiply this LPF value by my applied load. I assume this is my buckling load??

Can anyone confirm that this is the correct method, if not please correct me.

Thanks in advance.....