i) For a 2-D stress state, the principal stresses and principle directions are the eigenvalues and eigenvectors of the stress tensor o. Using this definition, find the principal stresses and principal directions of the stress state denoted by the following stress tensor (stress units in MPa): 10 -5 Oxx Txy Try Oyy] %3D -5 20
Permutations and Combinations
If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.
Counting Theory
The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.
ANSWER ALL PARTS
![a) i)
For a 2-D stress state, the principal stresses and principle directions are the eigenvalues
and eigenvectors of the stress tensor o. Using this definition, find the principal stresses
and principal directions of the stress state denoted by the following stress tensor (stress
units in MPa):
´ 10
[Oxx Try
Oyy
O =
Try
-5 20
For a real symmetric matrix, the eigenvectors are orthogonal. i.e. they are mutually
perpendicular. Verify this using the above stress tensor. Note that two column vectors
V1, V2 are orthogonal if their dot (inner) product is 0, i.e., v7 v2 = 0.
b) Consider the following matrix:
4
1
A =
-1
-6
-2
5
The eigenvalues of this matrix are known: A1 = -6, 12 = -1, and ^3 = 5. Using only the
knowledge of the eigenvalues of A, and without solving characteristic equations, find the
eigenvalues of the following matrices:
-8
-2
1
1
[21
4
В —
2
12
4
C = |-1
-11
-2
D =
-8
36
11
- 10
5
-5
20
5](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F37eec9f2-4e89-4eee-8340-c70983047879%2F6d1951c3-f9b8-4a45-97df-1656233255eb%2Fe2gzxi9_processed.png&w=3840&q=75)
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