Abstract
The growing demand for sustainable and environmentally friendly materials has spurred interest in natural fiber epoxy composites as a viable substitute for synthetic-based composites. Impact strength is a crucial mechanical property for structural applications and plays a key role in successfully utilizing natural fiber epoxy composites. This comprehensive review explores the impact strength characteristics of different natural fiber epoxy composites by examining the latest research and advancements in the field. The effect of fiber content, fiber length, stacking sequence, and fiber treatment techniques, such as chemical treatments and coupling agents, on epoxy-based composites' impact strength was discussed. Additionally, the effect of fiber hybridization and formulation in determining impact strength is explored, including the curing agents, manufacturing techniques and fillers. The challenges and limitations associated with the impact strength of natural fiber epoxy composites are addressed, along with strategies to overcome them. The review concludes with a summary of the approaches to improve impact strength, including fiber selection, fiber treatment, hybridization, matrix modification, fiber orientation, curing parameters, fiber content, and fiber length. The conclusions of this review provide valuable insights into enhancing the impact strength of natural fiber epoxy composites, paving the way for their wider adoption in various industries and promoting sustainable material alternatives.