Dear Arsalan Ahmad,

You have to define an amplitude and/or frequency, you can create a table( relation between percentage of lad and increment)

I hope it helps

Hello! In Abaqus you can  create a tabular Amplitude (Amplitudes - Tabular ) then you can define time/frequency and the amplitude. Another way that also you can use is using subroutines. Please fin attached a document that you can use to write subroutines. 

Many times it's less time consuming to read analysis manual rather than asking a question on public forum

@Abhimanyu Kumar...I think every one is eligible enough to have some idea of what he is asking about but through public forum he get able to clear all of his doubts

@Arsalan Ahmad: The reason I said I what I said was because your question was too basic, and it's already answered in abaqus analysis manual. From experience, I can easily say that most of these type of questions could be answered just by looking into the great abaqus analysis manual. Now you being a student, there's no excuse for being lazy and asking it on a platform and wait for almost a day to get answer....on the other hand, had you looked into the manual you'd gotten your answer in less than an hour or two. Rest is your call whether to take the advice or to be lazy :)

Hi Aesalan,

I understand your situation.

If you are working in CAE then there is an amplitude function from which you can assign amplitude and time table. 

Please read this through if you get some time.

http://abaqusdoc.ucalgary.ca/books/usb/default.htm?startat=pt07ch30s01aus104.html

Thanks