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Pain can be mild to severe in the affected dermatome, with sensations that are often described as stinging, tingling, aching, numbing or throbbing, and can be interspersed with quick stabs of agonizing pain. [22] Shingles in children is often painless, but people are more likely to get shingles as they age, and the disease tends to be more severe.
Stress–strain analysis (or stress analysis) is an engineering discipline that uses many methods to determine the stresses and strains in materials and structures subjected to forces. In continuum mechanics , stress is a physical quantity that expresses the internal forces that neighboring particles of a continuous material exert on each other ...
Deformation of a thin plate highlighting the displacement, the mid-surface (red) and the normal to the mid-surface (blue) The Kirchhoff–Love theory of plates is a two-dimensional mathematical model that is used to determine the stresses and deformations in thin plates subjected to forces and moments.
The equation can be applied either to the shear stress or to the uniform tension in a material. In the former case, the viscosity corresponds to that for a Newtonian fluid. In the latter case, it has a slightly different meaning relating stress and rate of strain. The model is usually applied to the case of small deformations.
Since stress and strain are tensor qualities they can be described on the basis of three principal directions, in the case of stress these are denoted by , , and . The following represent the most common yield criterion as applied to an isotropic material (uniform properties in all directions).
Potential triggers for this can include a weakened immune system as a consequence of stress, illness, medical treatments or old age. It can take up to four weeks for the shingles rash to heal.
The bodies are considered as consisting of smooth surfaces and homogeneous materials. A continuum approach is taken where the stresses, strains and displacements are described by (piecewise) continuous functions. The half-space approach is an elegant solution strategy for so-called "smooth-edged" or "concentrated" contact problems.
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