A microstructural study of Gr/Ep composite material subjected to impact
โ Scribed by Piyush K Dutta; David Hui; Satish V Kadiyala
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 875 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0045-7949
No coin nor oath required. For personal study only.
โฆ Synopsis
Fracture morphology and texture were observed on the impact generated graphite/epoxy composite fragments. The work identiยฎes and explains changes in the surface texture of the fragments generated at dierent impact velocities (122 to 610 m/s, 400 to 2000 ft/s) and over a wide range of specimen temperatures (ร54 to 248C, ร64 to 758F). The composite panels were impacted by spherical steel projectiles, and the entire spall was carefully collected after the impact. The spall was dierentiated according to dierent sizes and shapes. A few fragments representing each shape and size were selected to analyze the surface morphology using scanning electron microscopy (SEM). Change in the surface texture was observed according to the dierent sizes and shapes, and the change in size and shape of the fragments was credited to the change in impact force. The results following from the close and intense observation of several SEM fractographs revealed that the surface texture of the fragments is strongly dependent on the type of forces acting at the point of impact resulting in four dierent modes of failure: delamination, transverse matrix cracking, ยฎber fracture and ยฎber-matrix interface debonding.
๐ SIMILAR VOLUMES
Fragmentation is the mechanism by which composite structures absorb energy during a crash event. This mechanism is substantially different from that developed by metallic structures where energy is absorbed by large plastic deformations. Fragmentation is the result of different simultaneous and comp
AbstraeI--An elastic-plastic contact law that includes the effect of permanent deformation in the contact zone is used to study the transient response of a composite beam subject to impact. The governing differential equations are normalized to yield four nondimensional parameters which completely d