What type of study is this?

This is a Experimental Study study (also classified as: Quantitative Study).

October 1, 2025

Strain Rate Effects on the Compressive Behavior of Unidirectional CFRP

Key Points

Strain-rate strengthening effects were observed with enhancements of 72%, 68%, and 76% in strength at high strain rates.
Experimental testing using SHPB showcased dynamic responses in CFRP composites across three principal directions.
A strain-energy-based constitutive model achieved less than 3% error in strength prediction and less than 10% in energy absorption accuracy.
These findings inform improvements in the design of impact-resistant composite materials for various applications.

Abstract

ABSTRACT This study investigates the strain‐rate‐dependent compressive behavior of unidirectional CFRP composites through experimental and numerical approaches. Using SHPB testing, we systematically characterize dynamic responses along three principal directions (along fiber, transverse, and through‐thickness) under stress equilibrium and constant strain‐rate conditions (10 −3 –10 3 s −1 ). Results reveal significant strain‐rate strengthening effects, with 72%, 68%, and 76% strength enhancements in fiber, transverse, and through‐thickness directions, respectively, at high strain rates. A novel strain‐energy‐based constitutive model is developed, incorporating coupled evolution of strength and failure strain energy density with strain rate. The model demonstrates exceptional accuracy, achieving < 3% error in strength prediction and < 10% in energy absorption across the tested strain‐rate spectrum. These findings provide fundamental insights for improving impact‐resistant composite design.

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