Introduction 

This report provides a summary of the results of test performed as outlined within this document. Flexural test was conducted following ASTM D7264/D7264M – 15. Standard Test Method for Flexural Properties of Polymer Matrix Composite Materials. The coupon configuration was standard according to the standard specified. 

Test Date and Location 

The test was conducted on December 28, 2018 in material laboratory of Shanghai Zhengniu New Material Tech., Ltd., China. 

Test Operator 

Cheng Tan 

Description of Specimens 

Specimens in this test were manufactured by Shanghai Horse Construction. Table 1. shows information of the tested specimens. 

Specimens were labeled as HM20I-# for HM-20 Grade I, HM20II-# for HM-20 Grade II, HM30I-# for HM-30 Grade I, HM60I-# for HM-60 Grade I, HM1.2T-# for HM-1.2T, HM1.4T-# for HM-1.4T, HM2.0T-# for HM-2.0T and HM3.0T-# for HM-3.0T. 

For HM-20 Grade I and HM-20 Grade II sheet specimens, each specimen was made of three layers of dry fiber with HM180C3P impregnated adhesive. For HM-30 Grade I sheet specimens, each specimen was made of two layers of dry fiber with HM180C3P impregnated adhesive. For HM-60 Grade I sheet specimens, each specimen was made of one layer of dry fiber with HM180C3P impregnated adhesive. 

Typical flat specimen are used in this test. All CFRP sheet specimens were manufactured with three layers of dry fiber sheets, geometry of tested specimens are summarized in Table 2. Dimension for each specimen is summarized in Appendix A. 

Apparatus 

A 30 kN MTS testing machine (Model: E45) was used to conduct this test. 

5.0 mm diameter loading nose and supports was used in this test. 

Test Procedure 

Tests were conducted under a temperature of 23°±3°C. 

The span length was adjusted with a span to depth ratio 32:1 for all specimens as shown in Table 2. 

Procedure A, which is a three point bending test was adapted to test the specimens. All specimens were loaded at a rate of crosshead movement of 1.0 mm/min until failure. 

Load versus crosshead displacement data throughout the test method, maximum load, final load, and load at any obvious discontinuities in load-displacement data were recorded at a rate of 20 Hz. 

Test Results 

Failure mode and Maximum flexural stress for each specimen are summarized in Appendix B.