Einfluß der Herstellungsbedingungen von Doppel-V-Kerben an Prüfkörpern für den Schlagbiegeversuch nach DIN 53 753

Influence of the Manufacturing Process of Double V-Notches of the Test Specimens In connexion with DIN 53 753 ?Impact bending test on a test specimen with a hole-notch or double V-notch”? tests were carried out on test specimen whose notches had been manufactured by different procedures (by planing and by placing the notches into the injection mould). Four different thermoplastics – some of them short-glassfiber reinforced–were used. Proof was gained that all specimens with a notch radius of 0.5 mm will break and that hardly any differences between ?planed”? and ?injected”? notches will exist. With the possibility of selecting one particular radius it has become feasible to draw comparisons between the individual plastics as to their impact strengths. Microtome cuts, SEM-micrographs of the area of fracture and orientation measurements with the aid of a micropolariscope complete the investigations.