Prise en compte indirecte des défauts de fonderie dans la prévision de la tenue à la fatigue d’une hélice marine

Survey on fatigue strength of cast bronzes intended for marine propellers

“…In the present paper, only the data obtained with corrosion fatigue tests have been analysed; thus, the results reported in Ezanno et al . on Ni‐Al bronze are not taken into account because the test environment is not explicitly defined.…”

“…The data presented in Fig. do not include: the results evaluated in air or in demineralized water (data sets #10, #12, #24, #25); the results obtained with cathodic protection (data set #9); the results of test conducted on notched specimens (data sets #16, #21, #23, #25); the results presented in Jaske et al ., which were displacement controlled (data set #17); and the results in Ezanno et al ., because the environment is not explicitly defined (data set #1). …”

“…To validate and confirm these reference S-N curves, which are indeed identical, data of corrosion fatigue tests have been found for the case of Mn bronze in a report by the Det Norske Veritas (DNV) 13 , in Webb et al, 14 in May, 15 in Czyryca 16 and in Praeger. 17 For what concerns the Ni-Al bronze, the works of interest are Ezanno et al, 18 again the report of the DNV, 13 Wenschot, 19 Helle, 20 Tokuda et al, 21 Webb et al, 14 May, 15 Czyryca et al 16 and Praeger. 17 In Webb et al, 14 the test had been conducted on large cast bars and at frequencies ranging between 28 and 33 Hz.…”

“…In the present paper, only the data obtained with corrosion fatigue tests have been analysed; thus, the results reported in Ezanno et al 18 on Ni-Al bronze are not taken into account because the test environment is not explicitly defined. For the same reason, the fatigue tests data presented in Yoon et al 22 on Ni-Al and Mn bronzes at R = 0.1 conducted in air are not considered.…”

“…Another important aspect is the consideration of the presence of defects in the material and their detrimental effect. In Ezanno et al ., a probabilistic two‐scale method for Ni‐Al bronze material in the high cycle fatigue regime is proposed. The presence of micro‐flaws is taken into account by an indirect approach; thus, the shape of the defects has not to be known and considered.…”