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Why determinant of Mass and Stiffness matrix is zero?

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Old   July 9, 2013, 14:53
Default Why determinant of Mass and Stiffness matrix is zero?
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kamran
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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.
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Old   July 11, 2013, 10:47
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No one encountered this difficulty!
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Old   August 23, 2013, 16:30
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Rami Ben-Zvi
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Usually this situation arises when the problem is indeterminate, i.e., not enough BCs are given. Enforce your BCs by manipulating there matrices.
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