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Dynamic relaxation (DR) is a widely spread numerical method used in fields as structural dynamics (particularly in form-finding), geomechanics or biomechanics, among others. When using DR in numerical simulations, researchers usually follow two different paths in the choice of a damping strategy for the oscillations: some use a viscous damping while others use a kinetic damping. However, it is difficult to find comparisons between both methods to help deciding whether one is better than the other for a particular application. Focused in the field of form-finding of thin-walled structures, the...

Lower back pain is one of the most frequent reasons for consultation in the general population, which may affect up to 80-85% of people throughout life and being the most disabling symptom in young or middle-aged individuals.Causes of lower back pain can be multiple, as well as the individual characteristics of each lesion, so their management should be individualized.Currently, management of these patients consists in control studies by plain radiography, CT and MRI.These techniques cannot reliably assess early bone fusion, except in cases where a bridge or bone ingrowth exists as a sign of...