We start recalling with critical eyes the mathematical methods used in gauge theory and prove that they are not coherent with continuum mechanics, in particular the analytical mechanics of rigid bodies or hydrodynamics, though using the same group theoretical methods and despite the well known couplings existing between elasticity and electromagnetism (piezzoelectricity, photoelasticity, stream...

We investigate experimentally the mechanical response to shear of a monolayer of bidisperse frictional grains across the jamming transition. We inflate an intruder inside the packing and use photoelasticity and tracking techniques to measure the induced shear strain and stresses at the grain scale. We quantify experimentally the constitutive relations for strain amplitudes as low as 10(-3) and ...

[1] Building upon previous laboratory earthquake experiments of dynamic shear rupture growth taking place along faults with simple kinks, new and complex fault geometries involving cohesively held fault branches are studied. Asymmetric impact at the specimen boundaries controls the incoming shear ruptures, which are manipulated to propagate at either sub-Rayleigh or supershear velocities. High-...

The surfaces of many planetary bodies, including asteroids, moons, and planets, are composed rubble-like grains held together by varying levels gravitational attraction cohesive forces. Future instrumentation for operation on, interacting with, such will require efficient effective design principles methods testing. Here we present results from the EMPANADA experiment (Ejecta-Minimizing Protoco...

In 1909 the brothers E. and F. Cosserat discovered a new nonlinear group theoretical approach to elasticity (EL), with only experimental need measure EL constants. modern language, their idea has been use Spencer sequence instead of Janet for Lie groupoid defining rigid motions space. Following H. Weyl, our purpose is compute first time conformal space-time in order provide mathematical foundat...

The aim of this study was to assess the stress patterns on the peri-implant zone and residual alveolar ridge in different overdenture attachment system designs by the photoelasticity method. Four attachments systems were tested: O-ring, ERA, Bar-clip, and Bar-clip/O-ring association. The prostheses were loaded with 100 N in five pre-determined points and the photoelastic model was evaluated by ...

A three-dimensional photo elasticity analysis and an interactive finite-element package were used in parallel to analyze the stress distribution on the root of blind-holes in thin plates. Experimental analysis was conducted via stress freezing method. The FEM analysis was performed with the ABAQUS commercial code using material properties obtained experimentally as input. The results showed tha...

The first and second mode stress intensity factors (SIFs) of a contact problem between a half-plane with an edge crack and an asymmetric tilted wedge were obtained using experimental method of Digital Image Correlation (DIC). In this technique, displacement and strain fields can be measured using two digital images of the same sample at different stages of loading. However, several images were ...

In this paper, the forward and inverse analyses of oneand two-layer photoelastic tactile transducers are presented. For such transducers, an applied force profile generates stresses in the photoelastic layer, making it birefringent. Consequently, circularly polarized light input to the transducer becomes elliptically polarized at the output because of the introduction of a phase-lead distributi...