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Influence of shrinkage porosity on fatigue performance of iron castings and life estimation method

China Foundry 2016年第1期13卷 47-53页

作者： Wei Liu Wei-hao Zhai Jun-feng Zhao School of Mechanics Civil Eng.&ArchitectureNorthwestern Polytechnical UniversityXi'an 710129China China Helicopter Research and Development Institute Jingdezhen 333000China

Shrinkage porosity exists more or less in heavy castings, and it plays an important role in the fatigue behavior of cast materials. In this study, fatigue tests were carried out on the QT400-18 cast iron specimens containing random degrees of shrinkage porosity defect. Experimental results showed that the order of magnitude of life scattered from 103 to 106 cycles when the shrinkage percentage ranged from 0.67% to 5.91%. SEM analyses were carried out on the shrinkage porosity region. The inter-granular discontinuous, micro cracks and inclusions interfered with the fatigue sliding or hindering process. The slip in shrinkage porosity region was not as orderly as the ordinary continuous medium. The shrinkage porosity area on fracture surface(SPAFS) and alternating stress intensity factor(ASIF) were applied to evaluate the tendency of residual life distribution; their relationship was fitted by negative exponent functions. Based on the intermediate variable of ASIF, a fatigue life prediction model of nodular cast iron containing shrinkage porosity defects was established. The modeling prediction was in agreement with the experimental results.

关键词： shrinkage porosity iron castings fatigue life alternating stress intensity factor equivalent initial crack

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Development of Correlation Between Surface crack Size and Corrosion Pit Size for Service Life Prediction

Development of Correlation Between Surface Crack Size and Co...

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2007国际机械工程与力学会议

作者： Keliang REN Guozhi LV Majd-ud-din MUHAMMAD Youhong ZHANG Department of Aeronautical Structural Engineering Northwestern Polytechnical University Department of Physics & Electrical Information Engineering Ningxia University

In order to set up the relation between corrosion pits and equivalent initial surface crack （EISC）, for quantitative assessment of the residual strength of the aging structure in corrosive environment, a series of pre-corroded samples are prepared at different time and temperature, and subsequent fatigue experiments under uniaxial cyclic load have been performed with LY12-CZ Aluminium alloy. After pre-corrosion and fatigue test, the equivalent initial surface crack size is calculated through reverse integration of the Paris fatigue crack growth law and has solved the non-linear equation using Monte Carlo method from the experiment fatigue life. Finally life predictions are made using the pit sizes measured in experiment and EISC size calculated by reverse integration of the Paris fatigue crack growth law as the initial size of surface crack in computer package AFGROW, and compared with the experimented fatigue life. The results show that the size of equivalent initial surface crack is less than 19.7 to 22.5 percent of surface corrosion pit size which has the same life.

关键词： Corrosion pit Surface crack equivalent initial crack Monte Carlo method Aging structure Residual strength AFGROW

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