# A Geometric Approach to Thermomechanics of Dissipating by Lalao Rakotomanana

By Lalao Rakotomanana

Across the centuries, the advance and development of mathematical recommendations were strongly encouraged through the wishes of mechanics. Vector algebra used to be built to explain the equilibrium of strength platforms and originated from Stevin's experiments (1548-1620). Vector research was once then brought to check speed fields and strength fields. Classical dynamics required the differential calculus built by way of Newton (1687). however, the concept that of particle acceleration used to be the place to begin for introducing a based spacetime. prompt speed concerned the set of particle positions in house. Vector algebra idea used to be now not adequate to check the various velocities of a particle during time. there has been a necessity to (parallel) shipping those velocities at a unmarried element prior to any vector algebraic operation. the correct mathematical constitution for this shipping was once the relationship. I The Euclidean connection derived from the metric tensor of the referential physique was once the single connection utilized in mechanics for over centuries. Then, significant steps within the evolution of spacetime options have been made through Einstein in 1905 (special relativity) and 1915 (general relativity) by utilizing Riemannian connection. a bit of later, nonrelativistic spacetime consisting of the most gains of common relativity I It took approximately one and a part centuries for connection idea to be authorized as an self reliant conception in arithmetic. significant steps for the relationship idea are attributed to a sequence of findings: Riemann 1854, Christoffel 1869, Ricci 1888, Levi-Civita 1917, WeyJ 1918, Cartan 1923, Eshermann 1950.

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Extra info for A Geometric Approach to Thermomechanics of Dissipating Continua

Example text

Calculating the singularity field density in B is performed by updating the connection V for each change of discontinuity density. 42). This allows us to work at the evolution of the affine connection during the continuum deformation. 26) shows that the torsion tensor ~ remains non-null even if we adopt an affine connection V with vanishing coefficients, for instance those ofthe referential body (or symmetric = r~a)' Indeed, constants of the structure ~Oab associated to the basis (u} , U2 , U3) may not vanish.

For angular momentum. By considering now the angular momentum about any fixed point A in the ambient space, we introduce the variables: e = wo(AM, v, ei) = Ii re = wo(AM, pb, ei) Je = AM 1\ Pni. Angular momentum's conservation law holds: { dB (pliwo) dt iB = { p(AM X b)iWO + { iB iB div (AM x Pni )wo. 3 (Conservation ofangular momentum) Let B be any part ofa moving continuum. The change rate of B's angular momentum equals the moment of the body and contact forces on B as B moves with the continuum.

JaB ei ® ho(p~). 3 Existence of (second-order) stress tensor The main consequence of the assumption of the existence of a 2-form boundary action is the existence of a stress tensor field. [The usual version of Cauchy's theorem starts with a scalar-valued /lux. Let there be three quantities pe, re, and ie respectively of class C 1, CO, and C 1 verifying the conservation laws. Assume that the /lux ie is a function of the unit normal vector n at aB: ie = ie(n). n. 46 3. 2 (Existence of stress tensor) Let B be a continuum with its boundary oB.