Why determinant of Mass and Stiffness matrix is zero?

mashinsazi · July 9, 2013, 15:53

I have assembled a Mass and Stiffness matrices that don't lead me to the clear answer because my Mass and Stiffness matrices have zero and infinite determinant. I'm completely confused, I have run my program in MATLAB for different meshes and different properties but error still exist.
I don't why this happen. Can anyone help me about it?

note: I don't know whether it's important or not, but I used meshless method to assemble these matrices.

mashinsazi · July 11, 2013, 11:47

No one encountered this difficulty!

Rami · August 23, 2013, 17:30

Usually this situation arises when the problem is indeterminate, i.e., not enough BCs are given. Enforce your BCs by manipulating there matrices.

July 9, 2013, 15:53	Why determinant of Mass and Stiffness matrix is zero?	#1
mashinsazi New Member kamran Join Date: Apr 2011 Posts: 17 Rep Power: 15	I have assembled a Mass and Stiffness matrices that don't lead me to the clear answer because my Mass and Stiffness matrices have zero and infinite determinant. I'm completely confused, I have run my program in MATLAB for different meshes and different properties but error still exist. I don't why this happen. Can anyone help me about it? note: I don't know whether it's important or not, but I used meshless method to assemble these matrices.

August 23, 2013, 17:30		#3
Rami Senior Member Rami Ben-Zvi Join Date: Mar 2009 Posts: 155 Rep Power: 17	Usually this situation arises when the problem is indeterminate, i.e., not enough BCs are given. Enforce your BCs by manipulating there matrices. mashinsazi likes this.

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July 11, 2013, 11:47		#2
mashinsazi New Member kamran Join Date: Apr 2011 Posts: 17 Rep Power: 15	No one encountered this difficulty!