By Prof L S Srinath

This booklet is designed to supply a great starting place in Mechanics of Deformable Solids after an introductory path on power of Materials. This variation has been revised and enlarged to make it a accomplished resource at the topic. Exhaustive remedy of crucial subject matters like theories of failure, strength tools, thermal stresses, pressure focus, touch stresses, fracture mechanics make this an entire supplying at the topic.

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13 Plot of f(s ) versus s sociated plane. Since the state of stress at the point can be characterised by the six rectangular components referred to any orthogonal frame of reference, let us choose a particular one, x¢y¢z¢, where the z¢ axis is along n and the other two axes, x¢ and y¢, are arbitrary. With reference to this system, the stress matrix has the form. 14 shows these stress vectors on a rectangular element. The shear stress components tx¢z¢ and ty¢z¢ are zero since the z¢ plane is chosen to be the principal plane.

28. The pressure of water on face OB is also shown. With the axes Ox and Oy, as shown in Fig. 12 γ tan 2 β tyz = 0, tzx = 0, ⎞ ⎛ γ ⎞ − ρ ⎟⎟ y ⎟⎟ x + ⎜⎜ 2 ⎠ ⎝ tan β ⎠ x sz = 0 Check if these stress components satisfy the differential equations of equilibrium. Also, verify if the boundary conditions are satisfied on face OB. Solution The equations of equilibrium are ∂σ x ∂τ xy + + γx = 0 ∂x ∂y and ∂σ y ∂τ xy + + γy = 0 ∂y ∂x Substituting and noting that gx = 0 and gy = r, the first equation is satisifed.

In this plane we can mark a point Q with co-ordinates (s, t ) representing the values of the normal and shearing stress on the plane n. For different planes passing through point P, we get different values of s and t. Corresponding to each plane n, a point Q can be located with coordinates (s, t ). The plane with the s axis and the t axis is called the stress plane p. (No numerical value is associated with this symbol). The problem now is to determine the bounds for Q (s, t) for all possible directions n.

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