Prediction of crack tip plasticity induced due to variation in solidification rate of weld pool and its effect on fatigue crack propagation rate (FCPR) |
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| Authors: | Mudaser Ullah Chuan Song Wu Faisal Qayyum |
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| Affiliation: | 1.MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing, Institute of Materials Joining,Shandong University,Jinan,China;2.Department of Mechanical Engineering, CET,University of Sargodha,Sargodha,Pakistan;3.Institut für Metallformung,TU Bergakademie Freiberg,Freiberg (Sachsen),Germany |
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| Abstract: | Effect of solidification rate on crack tip plastic zone size at various crack lengths was calculated analytically and numerically by simplified Sih’s and Irwin’s models, respectively. Influence of plastic zone size is explained in terms of COD and elastic stress intensity factor within valid range of small scale yielding approximation. Up to plastic zone size range of 4–5 mm, a good agreement between numerical and analytical plastic zone size and elastic stress intensity factor for all weldments was observed. For high loads and greater crack lengths, experimentally obtained COD values were found 15–19 % more than simulation ones due to rapidly induced plasticity at high crack dimensions. Solidification rate showed a significant influence on FCPR, for solidification rates 13.75 °C/s, 6.97 °C/s and 4.32 °C/s the obtained fatigue strength was 35.29 MPa, 36.26 MPa and 41.32 MPa, respectively. |
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