Bewertung der Zaehigkeit von thermoplastischen Konstruktionswerkstoffen im Rohrleitungs-, Behaelter-und Apparatebau

摘要

The article elaborates the impact strength of thermoplastic materials in relation to the calculation basis in pipeline, vessel and equipment construction. The DVS-Guideline 2205-1 and the standard DIN EN 1778 contain mathematical equations. Both guidelines consider the influence of the material specific impact strength by the use of reduction factors A4 (A1) for the calculation of permissible stress. Performed experimental investigation reveals that the reduction factors need to be partially updated. The reduction factors are furthermore in partial contradiction with requirements in sheet and pipe standards, for which an update is equally necessary. Related mathematical equations are examined critically and indications for their further qualification are given. Moreover the recommended use of notched impact test - temperature curves for the comparison of materials and as a device in decision making processes is pointed out.