ISSN:
1460-2695
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract— Strain-controlled total endurance tests have been carried out on smooth specimens of 2¼Cr-1Mo steel at 550°C in continuous cycling, and also using interspersed blocks of “major” and “minor” cycling. Similar low-cycle fatigue crack growth tests were also carried out on cylindrical specimens of ½CrMoV steel containing a 0.2 mm deep starter defect using interspersed blocks of “major”, “intermediate” and “minor” cycling, their order being changed in separate tests.Damage summation in the smooth specimen tests at failure was found to be less than unity (irrespective of the failure criterion) when Miner's rule was employed, and the results are compared with limited previous data. Damage was also summed on an energy-expended basis and this was found to be (i) independent of strain range, and (ii) independent of cycle type (i.e. continuous loading or block loading). The nearer the chosen failure criterion to crack initiation, the closer was the agreement in accumulated energies.Similarly, in the crack growth tests, the number of complete loops to “failure” (10% load drop) was independent of block order over a wide range of applied strain ranges, but was affected by the number of cycles in each block. However, the energy criterion was again able to rationalise all the data.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1460-2695.1996.tb00967.x
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