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Zakavi, Seyed javid, Shiralivand, Behzad, nourbakhsh, Mohammad. (1396). Evaluation of combined hardening model in ratcheting behavior of pressurized piping elbows subjected to in-plane moments. فناوری آموزش, 7(1), 57-71. doi: 10.22061/jcarme.2017.640
Seyed javid Zakavi; Behzad Shiralivand; Mohammad nourbakhsh. "Evaluation of combined hardening model in ratcheting behavior of pressurized piping elbows subjected to in-plane moments". فناوری آموزش, 7, 1, 1396, 57-71. doi: 10.22061/jcarme.2017.640
Zakavi, Seyed javid, Shiralivand, Behzad, nourbakhsh, Mohammad. (1396). 'Evaluation of combined hardening model in ratcheting behavior of pressurized piping elbows subjected to in-plane moments', فناوری آموزش, 7(1), pp. 57-71. doi: 10.22061/jcarme.2017.640
Zakavi, Seyed javid, Shiralivand, Behzad, nourbakhsh, Mohammad. Evaluation of combined hardening model in ratcheting behavior of pressurized piping elbows subjected to in-plane moments. فناوری آموزش, 1396; 7(1): 57-71. doi: 10.22061/jcarme.2017.640

Evaluation of combined hardening model in ratcheting behavior of pressurized piping elbows subjected to in-plane moments

Journal of Computational & Applied Research in Mechanical Engineering (JCARME)
مقاله 6، دوره 7، شماره 1 - شماره پیاپی 13، آبان 2017، صفحه 57-71    اصل مقاله (1.4 M)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22061/jcarme.2017.640
نویسندگان
Seyed javid Zakavi* 1؛ Behzad Shiralivand2؛ Mohammad nourbakhsh2
1University of Mohagheh Ardabili
2Un. of Mohaghegh Ardabili
تاریخ دریافت: 26 مهر 1394،  تاریخ بازنگری: 25 فروردین 1395،  تاریخ پذیرش: 18 اردیبهشت 1395 
چکیده
In this paper the ratcheting behavior of carbon steel(ASTM A106B) and stainless steel(304L) elbows is studied under steady internal pressure and in-plane external moments at frequencies typical of seismic excitations. The finite element analysis with the nonlinear isotropic/kinematic (combined) hardening model has been used to evaluate ratcheting behavior of the elbows. Material parameters have been obtained from several stabilized cycles of specimens that are subjected to symmetric strain cycles. The rate of ratcheting depends significantly on the magnitudes of the internal pressure, dynamic bending moment and material constants for combined hardening model. The results show that the maximum ratcheting is occurred in the hoop direction at crown. Also, the results show that initially, the calculated rate of ratcheting is large and then decreases with the increasing of cycles. Also, the results obtained by using the Combined hardening model gives acceptable adaptation in comparison with the other hardening models(AF and Chaboche hardening models); however this model gives over estimated values comparing with the experimental data.
کلیدواژه‌ها
Ratcheting؛ Pressurized elbow pipe؛ In-plane bending moment؛ Strain hardening؛ Finite element
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