Failure Analysis of Q345 Steel Structures on Port Cranes

Wang, Hong Wei; Li, Wen Tao; Bai, Hong Bai; Xiao, Hai; Yu, Hongsong

doi:10.4028/www.scientific.net/amm.401-403.844

Cited by 5 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Wang and Zhao [29, 30] provided the relation curves between the number of cycle N and strain amplitude for Q345 material under cyclic loading, which after fitting in Origin can be expressed as …”

Section: Analysis Of the Strength And Fatigue Of The Guide Railmentioning

confidence: 99%

Analysis of the nonlinear dynamic response of guide rails for a suspended buffer

Tai

Guo

et al. 2019

PLoS ONE

View full text Add to dashboard Cite

Guide rails’ nonlinear dynamic response to the collision process between gangues and the suspended buffer is the basis for its intensity examination and fatigue prediction. This paper established a numerical model for simulating the dynamic response of buffer’s guide rails using Pro/E and Femap based on an analysis of the basic structural components of the suspended buffer. The effects of the gangues diameter and feeding rate on the guide rails’ dynamic response were investigated, which were mainly revealed by a tension in guide rails. Simulation results showed that the tension in guide rails rapidly increased to a peak value after the suspended buffer was impacted by gangues, followed by a periodic vibration. The peak tension, maximum and minimum tensions within the periodic vibration were exponential functions of the gangues diameter. And they depended linearly on the feeding rate. The vibration frequency of the tension in guide rails was an exponential function of the gangues diameter but did not depend on the feeding rate. Based on the backfilling workface parameters used in D.Ping coal miner’s 15601 working panel, the feeding rate of 500 t/h was selected. The diameter of the crushed gangues was selected to be 50 mm based on the strength of guide rails. Their expected service life is 54.2 years. Finally, an industrial test was performed in D.Ping coal miner’s 15601 working panel and the guide rails operated steadily. The measured vibration parameters of the tension in guide rails agree well with that of numerical predictions, which verified the reliability of the numerical model to some extent.

show abstract

Section: Analysis Of the Strength And Fatigue Of The Guide Railmentioning

confidence: 99%

Analysis of the nonlinear dynamic response of guide rails for a suspended buffer

Tai

Guo

et al. 2019

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…Q345 has been widely used in the production of storage tank and buildings [1][2][3] . However, it is very popular for the crack occurrence during welding because the martensite is prone to form at the hot affected zone, which will waste lots of material for manufacture of large products.…”

Section: Introductionmentioning

confidence: 99%

Cracks Forming and Propagation Mechanism for the Q345 Steel during Cooling

Xu¹,

Shuai²,

Yuan³

et al. 2021

dtmse

View full text Add to dashboard Cite

Cracks always occur for the Q345 steel during cooling, which usually lead to Welding failure. Through investigation of the cracks forming position and propagation path, its forming and propagation mechanism for the melted Q345 steel during cooling was studied in detail by using of SEM, EBSD and Nano Indenter equipment in this paper. SEM observation results imply that cracks mainly initiated at martensite phase region close to basal material. Moreover, it also can be observed that the cracks always propagated along the martensite lath or packets boundaries, but not the original prior austenite grain boundaries. The hardness differences between cracks adjacent positions and matrix is about 2.48 GPa, which is larger than that of melted region and matensite (0.70GPa). In addition, EBSD results show that the average prior austenite grains boundaries angles (30-50º) are always smaller than that of martensite lath and packet boundaries (>50º). Combining investigation of the cracks forming position, propagation path and microstructure misorientation, it proves that the occurrence of the cracks at junction of martensite phase region close to basal material is related with larger hardness difference or larger residual stress between martensite and ferrite, while cracks propagation path is controlled by the boundaries angles or local misorientation. The cracks incline to propagate along or deflect to large martensite lath and packets boundaries.

show abstract