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Showing 1 to 16 of 16 for “"Stress singularity"”.
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Experimental determination of the stress singularity exponent in cracked bodies using photoelasticity
… investigate the three dimensional nature of the stress field surrounding the border of semi-elliptical surface flaws, particularly the singularity exponent. Stress freezing photoelasticity is employed to generate experimental data from nearly incompressible, elastic material. The technique of …
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A combined analytical, numerical and experimental technique for investigating stress-singularity effects on Very High Cycle Fatigue of adhesive joints
L'abstract è presente nell'allegato / the abstract is in the attachment
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Dynamic Analysis of Interfacial Cracks in Composite Laminates
… used today. In this paper, the order of dynamic stress singularity of interfacial cracks is derived, and a hybrid finite element method is successfully developed for this problem. Both the cases of open and closed cracks are considered. An integral transform, the Wiener-Hopf technique, and an …
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Applicability Of Continuum Fracture Mechanics In Atomistic Systems
<p>By quantitating the amplitude of the unbounded stress, the continuum fracture mechanics defines the stress intensity factor K to characterize the stress and displacement fields in the vicinity of the crack tip, thereby developing the relation between the stress singularity and surface energy …
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On the rolling motion of viscous fluid on a rigid surface
… at the solid boundary, the non-integrable stress singularity arises at the contact line, which is physically unrealistic. The contact angle of 180 is considered as a special case in which the singularity is absent. The previous work showed that there exists a non-singular local solution in …
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A New Singular S-FEM For The Linear Elastic Fracture Mechanics
… been proposed and formulated to produce a proper stress singularity near the crack tip based on a basic mesh of linear triangular/tetrahedral elements that can be generated automatically for problems with complicated geometries. Numerical analyses and comparisons of proposed method with the …
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Investigations into deep cracks in rocket motor propellant models
… due to the complex geometry of the grain. A stress-freezing photoelastic investigation has been performed to study the deep cracks which emanate from the fingertips of the star-shaped cutout cylinders. Using three-dimensional photoelasticity and proper algorithms in fracture mechanics, the …
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A study of near tip phenomena for cracks in a particulate composite
… three dimensional photoelasticity, the dominant stress singularity order values were calculated in a four point single edged cracked bend specimen with both straight front and thumbnailed cracks. The free surface values are the same as for the inert propellant and in good agreement with …
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Determination of thermal strains in the neighborhood of a bimaterial interface
… The corresponding distributions of stresses, σ<sub>x</sub>, σ<sub>y</sub>, and τ<sub>xy</sub> were determined for the free surface. Near the interface, and along its length, the largest stresses were σ<sub>y</sub>, acting perpendicular to the interface. The σ<sub>y</sub> peaks …
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ΘΕΩΡΗΤΙΚΗ ΚΑΙ ΠΕΙΡΑΜΑΤΙΚΗ ΜΕΛΕΤΗ ΠΡΟΒΛΗΜΑΤΩΝ ΡΩΓΜΩΝ ΣΕ ΣΥΝΘΕΤΕΣ ΠΛΑΚΕΣ
… THE PROBLEM OF THE EVALUATION OF THE STRESS SINGULARITY OF A CRACK TERMINATED AT THE APEX OF A BIWEDGE, WHICH IS LOADED EITHER BY PRESCRIBED TRACTIONS OR DISPLACEMENTS. IN THE FOURTH CHAPTER, THE INFLUENCE OF A CIRCULAR INCLUSION ON THE PREVAILING STRESS STATE IN A CRACKED PLATE, WHICH …
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Analysis of cracks in nonlinear fiber composite materials
… deformation problem of the composites. Orders of stress singularity near cracks in both 0$\sp\circ$- and 90$\sp\circ$-fiber composites are obtained. A dimensional analysis based on conservation integrals in nonlinear mechanics is used first to achieve this goal. Also, the stress singularities and …
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Delamination-fretting wear failure evaluation at HAp-Ti-6Al-4V interface of artificial hip implant
… contact pressure and contact slip driven by stress singularity effect. Tensile-compressive condition (R = -1 ) experiences most significant delamination-fretting wear behaviour (8 times higher) compared to stress ratio R = 0.1 and R = 10. Finally, maximum delamination-fretting wear depth …
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Developments in topology and shape optimization
… parameter-free shape optimization method; a stress-constrained topology optimization; and a wave tailoring topology optimization. In shape optimization, the independent node movement approach, wherein finite element node coordinates are used directly as design variables, allows the most …
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Multiscale Peridynamics Analysis of Nanocomposites and Energetic Materials Using Nonlocal and Local Interface Models
… up to higher scales influencing the strain and stress fields, and damaging behavior in the macroscale material. This work focuses on the effects of different interface models in nanocomposites composed of carbon nanotubes in polymer matrix materials and their applications as nanocomposite …
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Limiting factors of the tensile strength of aramid fibers
… of crystalline domains at high strains/stresses scales inversely with the applied strain rate. Notably, at strain rates of 0.2-0.3 s -1 both as-spun and heat-treated fibers were linearly elastic until failure. A hypothesis that the fiber tensile strength is controlled by preexisting …
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Processing and Reliability Assessment of Solder Joint Interconnection for Power Chips
… solder joint have higher fracture stress than barrel-shaped solder joint. This verifies that hourglass-shaped solder joint has lower stress singularity at the interface between the solder bump and the silicon die as well as at the interface between the solder bump and substrate than …