A computational fatigue analysis of cyclic thermal shock in notched specimens

Multiaxial fatigue behavior of AISI 316L subjected to strain-controlled and ratcheting paths

“…r c;max and e c;ampl are the maximum normal stress and the normal strain amplitude on the critical plane. The parameters A 1 ; a 1 ; A 2 and a 2 are calibrated fitting the room temperature ASME-III mean air curve for AISI 316L [29] as shown by Janssens et al [30] and their values are reported in Table 4.…”

Design and development of resistive temperature detector arrays on aluminium substrates. Measurements in mixing experiments

“…The time to reach the 63.2% (τ) of the liquid temperature has an average value of 205 ms, which represents a cutting frequency of 4.9 Hz and, is highly compatible with the range used for thermal fatigue research. Previous studies on thermal fatigue and related thermal fluctuation frequencies have shown that the most dangerous frequencies are in the range of 0.085 up to 0.5 Hz, underlining that above 0.66 Hz the damages at the walls were negligible [7,9,10].…”

“…Recent studies on this subject have revealed that the amplitude of temperature fluctuation was attenuated during a series of fluid mixing to structural response by: turbulent diffusion, heat transfer and heat conduction [9]. Computational fluid dynamics analyses are performed including the wall by conjugate heat transfer models [10][11][12]. Several studies have been carried out in the past [13][14][15][16], where temperature fluctuations are detected and characterized with different techniques, such as for example infrared cameras or thermocouples.…”

Case study of the applicability of cyclic hardening material descriptions in finite element simulation of cyclic thermal shocks

“…Details about the experiment were published earlier. 10 In a decoupled, 2D plane strain thermal stress analysis, the specimens are submitted to a cyclic thermal load. The outer edge is in convectional contact with air at an ambient temperature of 25 o C with a heat transfer coefficient h = 40W/m 2 K. The inner surface is in convectional contact with oil, the temperature of which varies cyclically between 20 min time periods at 50 and 200 o C, the thermal shock transition time equal to 10 s. The heat transfer coefficients used are listed in Ref.…”

“…The inner surface is in convectional contact with oil, the temperature of which varies cyclically between 20 min time periods at 50 and , the thermal shock transition time equal to 10 s. The heat transfer coefficients used are listed in Ref. [10]. For the thermal simulation: 6018 quadratic quadrilateral elements of type DC2D8 and 122 quadratic triangular elements of type DC2D6 have been used, and for the subsequent stress simulation the same mesh with 6018 quadratic quadrilateral elements of type CPE8 and 122 quadratic triangular elements of type CPE6 has been used.…”