Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (3): 650-656.doi: 10.13229/j.cnki.jdxbgxb.20220474

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Crack growth rate of SMA490BW steel in different welding areas for bogie

Li HUI1(),Lei JIN2,Wan-wan SONG3,Song ZHOU2(),Jin-lan AN1   

  1. 1.Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process，Shenyang Aerospace University，Shenyang 110136，China
    2.School of Mechanical and Electrical Engineering，Shenyang Aerospace University，Shenyang 110136，China
    3.Shenyang Aircraft Corporation，Shenyang 110034，China
  • Received:2022-10-10 Online:2024-03-01 Published:2024-04-18
  • Contact: Song ZHOU E-mail:syhuili@126.com;zhousong23@163.com

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Abstract:

The fatigue crack growth behavior of SMA490BW steel welded joints for high-speed train bogies under different stress ratios in different welding areas was studied， and the microstructure and fracture morphology of the welded areas were characterized by optical microscope and scanning electron microscope. The results show that under the same stress ratio， the different welding areas （weld nugget zone， heat affected zone） of SMA490BW steel have little effect on the crack growth rate. The stress ratio has a greater influence on the crack growth rate. Under the same stress intensity factor， the crack growth rate at R=-1 is significantly higher than that at R=0； the stress ratio has a greater influence on the c parameter in the Paris formula and less on the m parameter.

Key words: mechanical engineering, SMA490BW steel, welded joint, crack growth rate, stress intensity factor

CLC Number: 

  • TG405

Fig.1

Specimen of fatigue crack propagation rate"

Fig.2

Welded joint sample"

Fig.3

Schematic diagram of sampling area of fatigue specimen"

Fig.4

Metallographic structure of weld nugget area"

Fig.5

Metallographic structure of heat affected zone"

Fig.6

Influence of welding area on crack growth rate"

Table 1

Values of c and m at different stress ratios"

应力比Rcm
01.156×10-104.074
-11.413×10-93.555

Fig.7

Effect of stress ratio on crack growth rate"

Fig.8

Crack sources in different welding area"

Fig.9

Crack propagation zone in different welding area"

Fig.10

Instantaneous interruption area of different welding area"

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