Numerical Investigation on Creep Crack Growth of Brazed Joint Using Different Damage Models

Abstract:

In this paper, four types of creep damage models (Kachanov-Robotnov, Liu-Murakami, Cocks-Ashby and Wen-Tu model) were used to study the creep crack growth (CCG) behavior in compact tension (CT) specimen of Hastelloy C-276/BNi-2 brazed joint. The results show that the creep damage model has a great influence on the CCG behavior of brazed joint. The crack-tip stress states, da/dt-C* curves, crack initiation time and rupture life are different for the different damage models. The Kachanov-Rabotnov model can lead to higher CCG rate and shorter rupture life, while the Cocks and Ashby model can reduce CCG rate and prolong the rupture life. The model order in terms of the CCG rate from high to low is K-R, L-M, W-T, C-A model, which is opposite order of crack initiation time. In the simulation of CCG of brazed joint, a precious damage model should be employed for life prediction.

• Periodical: Applied Mechanics and Materials (Volume 853)
• Pages: 231-235
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.853.231
• Online since: September 2016
• Authors: Yun Luo, Qian Zhang, Wen Chun Jiang*
• Keywords: Brazed Joint, Crack Growth, Creep Damage, Life Prediction

References

[1] F. Kawashima, T. Igari, Y. Miyoshi, Y. Kamito, M. Tanihira, High temperature strength and inelastic behavior of plate–fin structures for HTGR, Nucl. Eng. Des. 237 (2007) 591-599.

DOI: 10.1016/j.nucengdes.2006.09.007

[2] Yorikata Mizokami, Toshihide Igari, Fumiko Kawashima, Noriyuki Sakakibara, Masanori Tanihira, Tetsuo Yuhara, Tetsuyuki Hiroe, Development of structural design procedure of plate-fin heat exchanger for HTGR, Nucl. Eng. Des. 255 (2013) 248-262.

DOI: 10.1016/j.nucengdes.2012.09.013

[3] Tu S.T., Zhou Guoyan, Creep of brazed plate-fin structures in high temperature compact heat exchangers, Frontiers Mech. Eng. China 4 (2009) 355-362.

DOI: 10.1007/s11465-009-0065-2

[4] Zhao L, Xu L, Han Y, Jing H., Quantifying the constraint effect induced by specimen geometry on CCG behavior in P92 steel, Int. J. Mech. Sci. 94 (2015) 63-74.

DOI: 10.1016/j.ijmecsci.2015.02.009

[5] Zhang J. W., Wang G. Z., Xuan F. Z., Tu S. T., The influence of stress-regime dependent creep model and ductility in the prediction of CCG rate in Cr-Mo-V steel, Mater. Des. 65 (2015) 644-651.

DOI: 10.1016/j.matdes.2014.09.070

[6] Sithickbasha A A, Mahesh S, The role of the constitutive model in CCG modelling, Eng. Fract. Mech. 150 (2015) 47-57.

[7] Yokobori A T, Difference in the creep and CCG behaviour between creep ductile and brittle materials, Eng. Fract. Mech. 62(1) (1999) 61-78.

DOI: 10.1016/s0013-7944(98)00083-6

[8] Rabotnov YN. Creep problems in structural members. Amsterdam: North-Holland; (1969).

[9] Murakami S, Liu Y, Mesh-dependence in local approach to creep fracture, Int. J. Damage Mech. 4 (1995) 230-250.

[10] Cocks AF, Ashby MF, Intergranular fracture during power-law creep under multiaxial stresses, Metal. Sci. 8 (1980) 395-402.

DOI: 10.1179/030634580790441187

[11] Wen J-F, Tu S-T, Gao X-L, Reddy J, Simulations of CCG in 316 stainless steel using a novel creep-damage model, Eng. Fract. Mech. 98 (2013) 169-184.

DOI: 10.1016/j.engfracmech.2012.12.014