Abstract

This article reviews both intrinsic and extrinsic epoxy composites and their self-healing mechanisms. Epoxy resin composites
are polymeric epoxide composite materials capable of automatic repair when damaged, thus have become very popular in
recent years. With time, small damage and micro-cracks in epoxy composites are very common so requires regular inspection
and maintenance. The self-healing concept minimizes repair costs and increases the lifespan of the material. The addition of
functional composite material such as hollow fiber and microcapsules helps to repair the cracks of epoxy materials in extrinsic
self-healing composites. Whereas, the intrinsic self-healing mechanism is based on physical and chemical interactions. Epoxy
composites due to their exceptional strength, chemical, and heat resistance have superb load-bearing properties, therefore, find
wide applications in aerospace, automotive, and construction industries.