Quasi-static flexural test

Fig. 16.5 Damage to specimen no. 1 after quasi-static cyclic test (a) flexural crack across the ends of the long dowels and splitting crack along the lap-splice at the left edge, (b) damaged lap-splice region at one edge of the wall (c) lap-spliced bars without the spalled or loose cover, (d) CERP jacket around wall edge (specimen shown rotated, as if it were vertical)...

The flexural properties characterize the strength, deformation and stiffness behaviour of plastics under quasi-static bend loading. For these tests commercial universal test systems equipped with three-point and four-point fixtures are used. The most important standard for the bend test of plastics is the ISO 178 Plastics - Determination of flexural properties, which favors the three point bend test (Fig. 4.39). The data collected include also values determined according DIN 53452 and DIN 53457 as well as ASTM D 790. The specimen of preference exhibits dimensions of 80 x 10 x 4 mm and can be produced directly by injection moulding or cutting the shoulders from multipurpose specimens. 

The Table 4.7. shows a summary of available data especially modulus of elasticity in flexure Ef, flexural strength cTf and stress at conventional deflection fffc of bend tests under quasi-static load conditions for thermoplastics and resins. 

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