Test Background
As the application fields of fiber-reinforced plastic composite materials continue to expand, material R&D and structural designers need to design test methods and accurately evaluate data for the thickness direction performance of fiber-reinforced plastic composite materials to ensure their safety in use.
The fiber reinforced plastic composite bending test can determine the thickness direction (out-of-plane) bending strength, bending failure strain and bending modulus of carbon fiber reinforced plastic composite (CFRP) laminates.
The Zhongke Testing Reliability Experiment Center has reliability testing capabilities for various fiber-reinforced plastics and provides professional bending test services for fiber-reinforced plastic composite (CFRP) laminates.
Scope of tests
Commonly used fiber-reinforced plastics include polypropylene (PP), polyethylene (PE), polyester (PET) and other high-molecular polymers and high-purity natural wood, as well as some man-made fibers (cellulose fibers), glass-reinforced resins and metal fibers.
It can be divided into three categories according to its molding methods: thermoplastic resin, thermosetting resin, and polycarbonate.
Test method
The sample is rectangular, and its length direction is the thickness direction of the CFRP laminate. The specimen is placed between two supports, and a load is applied at a constant rate in the middle of the specimen until failure occurs on the outer surface of the specimen. Through-thickness properties are measured through the tensile stress and strain produced by the specimen during a bending test.
Since strength depends on size effects, the size effects should be quantitatively estimated through tensile strength and effective volume.
Test standard:
GB/T 41762.2-2022 Fiber-reinforced plastic composites - Determination of properties in the thickness direction of laminates - Part 2: Determination of elastic modulus, strength and Weibull size effect of carbon fiber unidirectional laminates by bending test
ISO 20975-2: 2018 Fiber reinforced plastic composites Determination of properties in the thickness direction of laminates Part 2: Determination of elastic modulus, strength and Weibull size effect of carbon fiber unidirectional laminates by bending test
BS ISO 20975-2: 2018 Fiber reinforced plastic composites Determination of properties in the thickness direction of laminates Part 2: Determination of elastic modulus, strength and Weibull size effect of carbon fiber unidirectional laminates by bending test
