Measure Strength Of Carbon Fiber Reinforced Plastic

Carbon Fiber Reinforced Plastic or Carbon Fiber Reinforced Polymer (CFRP) is known for its high strength to weight ratio, excellent high-temperature characteristics and resistance fatigue. CFRP has gained substantial interest in manufacturing industries especially in the weight-critical aerospace industry. Also, it has applications in automotive, marine and civil engineering industries.

Carbon fiber is the backbone of CFRP and is responsible for its strength. Each carbon fiber is a long thin strand made of thousands of carbon filaments with a diameter of 5-10μm. The compressive strength of carbon fiber is significantly less than its tensile strength. Thus, in industry applications, axial compressive strength is usually used as the basis for its design rating. This ensures the safety and functionality of the finished product.

The FISCHERSCOPE® HM2000 (Fig. 1) is an automated instrumented indentation measuring instrument which is ideal for performing compressive strength testing on carbon fiber using a special 50μm Flat Indenter (see Fig.1). The FISCHERSCOPE® HM2000 is known for its high resolution and precision which is ideal for measuring small and brittle samples such as carbon fibers.

FISCHERSCOPE® HM2000 (left) with microscopic view of Flat; Indenter (right).

The FISCHERSCOPE® HM2000 is intuitive and does not require special specimen preparation for such tests. Simply place the CFRP sample on the measuring stage, check the monofilament diameter, and start the measurement.

The graph below (Fig. 2) shows the carbon fiber measurement process. As the indenter contacts the surface of the carbon fiber, the load increases linearly. Once the sample is crushed, the load curve gradient will increase rapidly. This occurred at a test force of 1547mN and compression (indentation depth) of 3.6 μm (see detail X in Fig. 2) for this sample. This force value is used to calculate the effective stress of the fiber in terms of compression. The microscopic images in Fig. 3 shows fragments of the remaining fiber after the fiber is fully crushed.

Graph showing Test force [mN] against Compression (Indentation depth [μm]).

Microscopic picture of the the small fiber before (left) and after the indentation (right).


    Contact us on

    01386 577370

    or leave your details below

    Contact Form: OfferConsultationCallAdditional InformationTraining


    * I agree that the Company Helmut Fischer Holding GmbH Sindelfingen (DE) and Helmut Fischer Holding AG Hünenberg (CH) as well as the distribution partners (International) collect, process and use my personal data for the purpose of product information, offer to use campaign and event notices and further advertising by Fischer. I may rescind my consent at any time for any reason at >>Click Here<< Further information on the handling of personal data can be found in the Privacy Policy.

    Leave a Reply