This paper concerns the mathematical, linear model of elastic,
homogeneous and isotropic body, of neglected structure and of
small elastic deformations in the frame of linear theory of elasticity; proposed by Hooke, and shortly called (H). In this
paper, first, we write the displacement Lame equations for (H) elastic body, which initial configuration is unbounded, simply connected region in 3 R .Next, by using Stocks-Helmholtz theorem, we discuss the Nowacki's potential equations for the (H) elastic body. Then, we demonstrate the resulting equations from Lame equations for the displacement amplitudes, when the displacements and body loads varying harmonically in time. We, also demonstrate the resulting equations from the Nowacki's potential equations for the Nowacki's potential amplitudes, in the case when the Nowacki's potentials and body loads varying harmonically in time. Next, after demonstrating tow important theorems, giving volume-surface integral transforms
for Helmholtz differential operators, we derive an integral representations for the solutions of the nonhomogeneous Nowacki's potential equations, all these in form of surface integrals on the boundary of tow-order connected region, occupied by a part of the body, in the initial moment. Then, we discuss the asymptotic conditions of Sommerfeld type for the above mentioned solutions (which relate to the nonzero body loads varying harmonically in time), when the external surface of the tow-order connected region tends to the infinity. Finally, we end this paper by some important open problems.
