Advances in Cruciform Biaxial Testing of Fibre-Reinforced Polymers

Area of Science:

• Materials Science
• Mechanical Engineering
• Composite Materials

Background:

• Fibre-reinforced polymer matrix composites exhibit complex mechanical behavior and failure under multiaxial loads due to heterogeneity and anisotropy.
• Cruciform specimen testing is a common biaxial testing technique, but lacks standardized consensus.
• A comprehensive review is needed to establish reliable testing procedures for these materials.

Purpose of the Study:

• To review the state-of-the-art of cruciform specimen testing for fibre-reinforced polymers.
• To analyze key aspects influencing biaxial testing outcomes, including material constituents, specimen geometry, and loading ratios.
• To consolidate analytical, numerical, and experimental findings and propose modifications for enhanced test scope.

Main Methods:

• Literature review of analytical, numerical, and experimental studies on biaxial testing of fibre-reinforced polymers using cruciform specimens.
• Analysis of specimen design parameters, material properties, and load application strategies.
• Compilation and synthesis of existing research findings and proposed test modifications.

Main Results:

• Identified critical factors influencing biaxial test results, such as composite constituents, specimen geometry, and tensile/compressive load ratios.
• Collected and summarized significant findings from analytical, numerical, and experimental investigations.
• Detailed various proposed modifications to enhance the scope and reliability of cruciform specimen tests.

Conclusions:

• Standardization of cruciform specimen testing for fibre-reinforced polymers requires detailed analysis of influencing factors.
• Existing research provides a foundation for developing robust testing procedures.
• Proposed modifications offer potential for broader application and improved accuracy in biaxial mechanical characterization.