Influence of grinding direction on fracture strength of silicon nitride

Article Abstract:

Analysis of surface grinding of reaction-bonded and sintered reaction-bonded silicon nitride flexure bars shows that flaws produced in fracture strength are directional in nature. Under the same grinding conditions, transverse grinding shows greater reduction in the fracture strength of samples as compared to longitudinal grinding. Increasing the material removal rate reduces the fracture strength during transverse grinding. However, the fracture strength is unaffected by varying the material removal rates during longitudinal grinding.

Research, Silicon nitride, Silicon nitrides, Bars (Engineering), Bars (Metal)

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Effect of material anisotropy and curing stresses on interface delamination propagation characteristics in multiply laminated FRP composites

Article Abstract:

The thermoelastic effect of material anisotropy and curing stresses on interlaminar embedded elliptical delamination fracture characteristics in multiply laminated fiber-reinforced polymeric (FRP) composites are studied. It is found that the individual modes of energy release rates vary along the delamination front depending on the ply sequence, orientation and thermoelastic material anisotropy of the constituting laminae, which causes the anisotropic, and non-self similar delamination propagation along the interface.

Methods, Usage, Polymeric composites, Polymer composites, Stress analysis (Engineering), Mechanical properties, Finite element method, Fibrous composites, Fiber reinforced composites

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Stable crack growth in rate-dependent materials with damage

Article Abstract:

Crack growth under small-scale-creep/damage conditions is investigated by a cohesive zone model of the Dugdale-Barenblatt type. The power law viscous overstress relation, which is modified by a damage function of the Kachanov type, describes the material inside the cohesive zone. The investigation of the velocity dependence of the fracture toughness shows that it is directly proportional to the velocity, and that it asymptotically approaches the instance that neglects damage.

Observations, Surfaces, Deformation of, Surface deformation

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