Ultrasonic evaluation of thermal fatigue composites

Article Abstract:

Three different composites were subjected to thermal cycling using an apparatus that moved the specimens in and out of a furnace. The effects were determined using computations of longitudinal acoustic velocity, attenuation coefficient and flexural strength. Results show that thermal fatigue in composites is generally caused by fiber-matrix debonding which becomes evident as the thermal cycles increase. The difference is in the number of cycles required before each composite shows signs of fatigue.

Usage, Ultrasonic testing, Composite construction, Composite building materials

---

Cyclic deformation and fatigue of a TiNi shape-memory alloy wire subjected to rotating bending

Article Abstract:

An investigation into the cyclic deformation and fatigue of a TiNi shape-memory alloy (SMA) wire, was based on rotating-bending fatigue tests at different strain amplitudes, temperatures and speeds, in air and water. Fatigue life was longer than 10super7 cycles with no change to deformation properties under cyclic deformation, in the rhombohedral-phase transformation region. Fatigue life was shorter than 10super5 cycles for strain amplitudes in the martensitic transformation region.

Observations, Materials

---

Low-cycle fatigue of TiNi shape memory alloy and formulation of fatigue life

Article Abstract:

The low-cycle fatigue properties of TiNi shape memory alloy undergoing rotation and bending in water and in air do not show corrosion fatigue in the low-cycle fatigue region in water. Data further indicate that the fatigue life is similar in air and water at elevated temperatures whereas stress-strain curves show differences.

Japan, Analysis, Evaluation, Stress-strain curves, Metals, Metal fatigue

Similar abstracts:

• Abstracts: Enrichment of high-rate PCE dechlorination and comparative study of lactate, methanol, and hydrogen as electron donors to sustain activity
• Abstracts: Evolution of products in the combustion of scrap tires in a horizontal, laboratory scale reactor. Fungal pretreatment of eucalyptus wood can strongly decrease the amount of lipophilic extractives during chlorine free kraft pulping
• Abstracts: Evaluating program performance: the case of Federally-funded collaborative research. Costly R&D and intellectual property rights protection
• Abstracts: How females choose their mates. People do more than imitate. Animals imitate, too
• Abstracts: Constitutive modeling of high-elongation solid propellants. Behavior of a unidirectional metal-matrix composite under thermomechanical loading

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.