Fatigue tests rotational bending

Maximum Load Computation to Avert Fatigue for Rotating-Bending Tests... 

Rotating Beam Fatigue Test for Steel Cords. The purpose of this test method is to evaluate steel cord for pure bending fatigue (121). The test sample consists of a 3-mm diameter mbber embedded with steel cord. Different bending stress levels are appHed and the time to failure is recorded. The test stops at 1.44 million cycles. The fatigue limit is calculated from S—N (stress—number of cycles) curve. 

Table 3.25 Rotating bend fatigue test results for a number of stainless steels...

Hoeppner pointed out that until the early 1970s, most investigators conducted fatigue tests utilising rotating bending, flat plate bending or... 

The results of rotating-bending fatigue tests are provided in Fig. 8.15(a) for as-cast NiAl bronze and for this material after FSP using the linear raster pattern. Corresponding data for uni-... 

Testing of metals - Rotating bar bending fatigue test... 

Table lc.21 Rotating bending fatigue tests of unnotched and notched titanium alloys (Ref. 19)... 

Table lc.26 Influence of texture and test directions on the rotating bending fatigue strength of Ti6A14V (fine equiaxed microstructure in rolled plates) (Ref. 32)... 

Fig. 3.1-168 Rotating-bending fatigue test results for as-received and recrystallized Mo rods (diameter = 25 mm) at room temperature [1.126]...

Jaske and Castillo [36] used RR Moore rotating beam fatigue machines to study several roll materials with simulated white water solutions dripped onto the test specimen surface. Castillo et al. [19] used rotating bending tests to evaluate the corrosion fatigue resistance of duplex stainless steel suction roll alloys. Yoshitake et al. [21] also used this method. 

TAPPI TIP 0402-09, Rotating Bar Bending Fatigue Testing in a Corrosive Environment, TAPPI, Atlanta, GA, 1984. 

ISO/CD 1143 Metallic materials—Rotating bar bending fatigue testing... 

Furthermore, anticipated in-service conditions may call for conducting simulated laboratory fatigue tests that use either uniaxial tension-compression or torsional stress cycling instead of rotating-bending. 

For rotating-bending fatigue tests, schematic diagrams of (a) a testing apparatus, and (b) a test specimen. 

Figpre 8.20 Maximum stress (S) versus logarithm of the number of cycles to fatigue failure (N) for seven metal alloys. Curves were generated using rotating-bending and reversed-cycle tests. 

A cylindrical bar of 1045 steel having the S-N behavior shown in Figure 8.20 is subjected to rotating-bending tests with reversed-stress cycles (per Figure 8.18). If the bar diameter is 15.0 mm, determine the maximum cyclic load that may be applied to ensure that fatigue failure will not occur. Assume a factor of safety of 2.0 and that the distance between loadbearing points is 60.0 mm (0.0600 m). 

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