Compositesindex

Compositesindex is a proposed umbrella metric used to summarize and compare the performance and sustainability of composite materials across industries. It does not refer to a single material property, but to a composite score derived from multiple attributes including mechanical performance, durability, manufacturability, cost, and environmental impact. The index is typically presented as a dimensionless score on a 0 to 100 scale, where higher values indicate more favorable overall performance for a given context.

Calculation combines data from standardized tests, supplier data, and independent assessments. Common components include tensile strength and stiffness, fatigue and environmental resistance, density and weight savings, processing requirements, energy use, waste, and end-of-life options. Weighting schemes vary by application, with sector-specific variants emphasizing different attributes. Some implementations separate a performance index from a sustainability or lifecycle index, which can be combined for an overall composite score.

Uses include design optimization, supplier benchmarking, procurement decisions, and policy analysis. It can support rapid material screening and help track improvements over time. It is not a property of a material itself and should be interpreted in the context of defined use cases and data quality.

Limitations include dependence on data availability, standardization of metrics, and transparent weighting. Comparisons are most meaningful within the same application and lifecycle assumptions. Future developments may include standardized protocols, open data sharing, and regional benchmarking to improve reliability and comparability.