Comparison of high‐ and low‐frequency fatigue properties of structural steels S355J0 and S355J2

Abstract

The paper brings results of high-cycle fatigue and very-high-cycle fatigue tests of the steel S355 tested during low-and high-frequency loading. Two grades of structural steel (S355J0 and S355J2) were tested to gain fatigue properties that serve as inputs to reliable finite element calculations of cyclically loaded structures. Experimental measurements of both steel grades were performed on low-frequency hydraulic and high-frequency ultrasonic fatigue testing systems. Both low-and high-frequency loading showed higher lifetime for the grade S355J2. The difference between the two studied steel grades was more apparent during low-frequency loading. The significant difference between the results of low-and high-frequency loading tests can be explained by the fact that the resistance to plastic deformation increases with an increasing rate of deformation. Fracture surfaces were studied by electron microscopy, where they exhibited both surface and internal crack initiation.

Effects of loading frequency on fatigue behavior of metallic materials—A literature review

“…For J2 grade, the value is 270 MPa by conventional frequency and is 350 MPa by ultrasonic frequency. Klusak et al 28 considered that the remarkable frequency effect for the steels with low strength, which is similar to the previously described two cases 17,19 . The difference in fatigue strength by low and high frequencies was explained by the need of time for plastic deformation during cycling.…”

“…Figure 14 is a very recent case reporting the loading frequency effect on the fatigue strength for a bcc material of structural steel S355 with two grades of S355J0 and S355J2 28 . The values of tensile strength for these two grades are 508 and 555 MPa, respectively, with J2 grade about 9% higher than J0 grade.…”

“…S–N data of two grades of S355 steel, showing ultrasonic frequency tests resulting in much higher fatigue strength than conventional frequency tests 28 . [Colour figure can be viewed at wileyonlinelibrary.com]…”

Virtual special issue: Advances in structural integrity research

“…1 The influence of highcycle fatigue and very-high-cycle fatigue loading on the structural steel S355 during low-and high-frequency loading was assessed. 2 It was verified that the resistance to plastic deformation increases with an increasing rate of deformation, justifying the low-and high-frequency loading test results. Also, the effect of different manufacturing processes on the fatigue and crack propagation behavior is addressed.…”

“…Some contributions are mainly aimed to understand different material behavior and the material behavior using advanced formulations 1 . The influence of high‐cycle fatigue and very‐high‐cycle fatigue loading on the structural steel S355 during low‐ and high‐frequency loading was assessed 2 . It was verified that the resistance to plastic deformation increases with an increasing rate of deformation, justifying the low‐ and high‐frequency loading test results.…”