Overcoming limitations of the conventional strain-life fatigue damage model

Article Abstract:

A two-parameter curve fit of the strain-life equation overcomes the inconsistency of the strain-life equation with the locally fitted strain-life component data. A nonlinear least-squares method is used in the two-parameter curve. Compared to the uncorrected curve, the corrected curve causes more damage to the cycles for extreme high and low strain conditions. The self-consistent forms of the Smith-Watson-Topper model are determined.

Usage, Fatigue (Materials), Materials, Differential equations

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An investigation of the formability of long fiber thermoplastic composite sheets

Article Abstract:

Analytical and experimental studies help evaluate the utility of long fiber thermoplastic composite sheets for solid-phase forming processes. The forming tests were conducted for different forming temperatures ranging between glass transition temperature and polypropylene matrix melting point. A continuum material behavior model with rational symmetry and normal anisotropy helps develop a method for analysis of the forming process.

Evaluation, Ceramic-matrix composites, Ceramic matrix composites

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An investigation of necking instability in fiber reinforced polypropylene

Article Abstract:

A simple linear viscoelastic model predicts the stress-strain behavior and the localized necking instability in glass fiber reinforced polypropylene. Under appropriate forming temperatures and strain rates, the composites are ideal for solid-phase formability. Such composites with high strain rate sensitivity have delayed local necking. The maximum limit strain is a function of temperature and strain rate.

Research, Analysis, Strains and stresses, Stresses (Materials), Polypropylene, Fibrous composites, Fiber reinforced composites

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