Creep in building stones under tensile conditions

Article Abstract:

The mechanical effects related to permanent loading in time were determined through a series of long-term tension and bending tests performed on four natural building stones. Findings from the first series indicated a time-delayed response similar to the creep characteristics of various geomaterials, metals and ceramics. However, the stone building materials had a higher strength decay occurring in short times. A damage analysis based on the tertiary creep phase showed both the physical and phenomenological relationship of the adopted Kachanov-Rabotnov rule to the actual mechanical degradation time-progress.

Materials, Creep (Materials), Building stones, Building stone

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Modeling damage evolution in hybrid ceramic matrix composite under static tensile load

Article Abstract:

A study was conducted on the damage evolution in a unidirectional hybrid ceramic matrix composite (CMC) of a Lithium Aluminosilicate glass under tensile load. The ceramic composite is made up of 20% Nicalon and 40% Sic. The nature of the damage was observed using an optical and electron scanning microscopes. Results have shown that the matrix cracking is followed by Sic failures and then Nicalon fiber fractures. A damage model for CMC was then developed and was proven to be useful when damage mechanisms are unchanged between fatigue and monotonic cases.

Deformations (Mechanics), Deformation, Strains and stresses, Stresses (Materials), Ceramic-matrix composites, Ceramic matrix composites

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Evaluation of tensile strength of multistrand conductors - Part 1: Theoretical basis

Article Abstract:

A simple model to predict plastic behaviour of a stranded conductor under tensile loading to fracture, predicted a maximum failing load and total elongation. The torque transmitted in conductors with fixed extremities and the rotation angle in free rotating conductors were considered. Permanent set due to bending and torsion during stranding was accounted for.

Plastics, Observations

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