Orthotropic elastic constants of a boron‐aluminum fiber‐reinforced composite: An acoustic‐resonance‐spectroscopy study

We review some of our recent studies on the effective elastic constants of composites where the occluded phase is spherical or spheroidal (oblate or prolate). From constituent properties and phase geometry, we estimated the composites’ effective macroscopic elastic constants using two models: the Ledbetter-Datta scattered-plane-wave ensemble-average model and the Mori-Tanaka effective-field model. We measured elastic constants by three principal methods: resonance, pulse-echo, and acoustic-resonance spectroscopy. We show microstructures, measurements, and model calculations for five representative composites: SiCp/Al, Al2O3-mullitep/Al, Al2O3p/ mullite, graphitep/ferrite (cast iron), voids/Ti.

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On the measurement of anisotropic elastic constants of fiber-reinforced composite plate using ultrasonic bulk wave and laser generated Lamb wave

Ultrasonics ◽

10.1016/s0041-624x(99)00025-6 ◽

1999 ◽

Vol 37 (6) ◽

pp. 405-412 ◽

Cited By ~ 48

Author(s):

T.-T. Wu ◽

Y.-H. Liu

Keyword(s):

Elastic Constants ◽

Lamb Wave ◽

Composite Plate ◽

Bulk Wave ◽

Fiber Reinforced ◽

Fiber Reinforced Composite ◽

Reinforced Composite ◽

Anisotropic Elastic

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The effect of metallic fiber geometry and multi-walled carbon nanotubes on the mechanical behavior of aluminum fiber-reinforced composite adhesive joints

Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications ◽

10.1177/1464420720981404 ◽

2020 ◽

pp. 146442072098140

Author(s):

Maryam Khayamdar ◽

Hadi Khoramishad

Keyword(s):

Carbon Nanotubes ◽

Mechanical Response ◽

Adhesive Layer ◽

Adhesive Joints ◽

Fiber Reinforced ◽

Fiber Reinforced Composite ◽

Reinforced Composite ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

Aluminum Fiber

The effect of the geometry of metallic fibers on the mechanical response of aluminum fiber-reinforced composite adhesive joints was studied experimentally. Moreover, a combination of multi-walled carbon nanotubes and aluminum fibers was used for reinforcing the composite adhesive joints. Different geometries for the aluminum fibers including straight, twisted and spring-shaped with different pitch lengths were considered. The results indicated that the composite adhesive joints reinforced with a combination of multi-walled carbon nanotubes and aluminum fibers experienced the highest improvement of 171% in the strength compared to the unreinforced specimen. It was found out that the aluminum fiber geometry can significantly influence the adhesive joint behavior. Incorporating the twisted aluminum fibers into the adhesive layer increased, while the spring-shaped fibers decreased the strength of the composite adhesive joints compared to the straight aluminum fibers. The fracture surfaces of the composite adhesive joints were analyzed using scanning electron microscope.

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