Corrosion Fatigue Crack Growth Prediction Model Based on Stress Ratio and Threshold for Marine Engineering Steel DH36Z35 in Seawater

doi:10.11902/1005.4537.2021.016

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (1): 163-168 DOI: 10.11902/1005.4537.2021.016

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Corrosion Fatigue Crack Growth Prediction Model Based on Stress Ratio and Threshold for Marine Engineering Steel DH36Z35 in Seawater

LIU Dong¹^,², LIU Jing¹(

), HUANG Feng¹, DU Liying², PENG Wenjie²

^1.The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
^2.R & D Center of Wuhan Iron & Steel Co. Ltd. , Baosteel Central Research Institute, Wuhan 430080, China

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Abstract

The fatigue crack growth rate of marine engineering structural steel DH36Z35 in air and artificial seawater are comparatively assessed by means of a home-made seawater corrosion fatigue machine by applied stress ratio of 0.1, 0.3 and 0.5 with a frequency of 3 Hz. The results show that the fatigue crack growth rate increases with the increase of stress ratio R under the same ΔK bothin air and artificial seawater, and this phenomenon is especially evident in the near threshold range 1×10^-7 mm/cycle≤da/dN≤1×10^-6 mm/cycle. When the fatigue crack growth rate (da/dN) is above 1×10^-6 mm/cycle, a flection point may emerge on the curve of fatigue crack growth rate measured both in air and seawater. For the case of testing in the seawater, above the flection point the crack growth is accelerated, whereas below which the crack growth is inhibited. The higher the stress ratio is, the higher the fatigue crack rate corresponding to the inflection point is. Based on the difference of test results in air and artificial seawater by different stress ratio and threshold, a modified Walker model for the prediction of corrosion fatigue crack growth rate is established. By the new prediction model, the fatigue crack growth rate by the applied different stress ratio in seawater can be predicted through the fatigue crack growth rate in air.

Key words: marine engineering structural steel corrosion fatigue crack growth rate stress ratio artificial seawater

Received: 22 January 2021

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51871172);Central Government Directs Special Projects for the Development of Local Science and Technology(ZYDD2018026)

Corresponding Authors: LIU Jing E-mail: liujing@wust.edu.cn

About author: LIU Jing, E-mail: liujing@wust.edu.cn

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Cite this article:

LIU Dong, LIU Jing, HUANG Feng, DU Liying, PENG Wenjie. Corrosion Fatigue Crack Growth Prediction Model Based on Stress Ratio and Threshold for Marine Engineering Steel DH36Z35 in Seawater. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 163-168.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.016 OR https://www.jcscp.org/EN/Y2022/V42/I1/163

Fig.1 Schematic diagram of corrosion fatigue crack growth rate sample (mm)

Fig.2 Fatigue crack growth rate test underdifferent stress ratios in air and in seawater

Fig.3 da/dN-ΔK curves under R =0.1 (a), 0.3 (b) and 0.5 (c) in air and seawater

Table 1 Paris model fitting curve equation and the threshold value Δ K_th

Fig.4 da/dN-(ΔK-ΔK_th) curves underr R=0.1 (a), 0.3 (b) and 0.5 (c) in air and seawater

Table 2 Trantina-Johnson model fitting curve equation

Fig.5 Measured and predicted da/dN under R=0.1 (a), 0.3 (b) and 0.5 (c) in seawater

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