Experimental Investigation of Mode I Fatigue Crack Growth Behavior of Titanium Foils
A low-cost experimental apparatus has been developed to investigate the Mode I fatigue crack growth behavior of thin metallic foils and sheets.The apparatus utilizes magnetic coupling between a ceramic magnet and a rotating steel disk to induce cyclic tensile loads in notched rectangular test specimens.To illustrate the testing apparatus,Mode I fatigue crack growth in 30 ?m thick high purity titanium foils was studied.Experiments were performed at ambient temperature using a loading frequency of 2 Hz and a nominal stress ratio of 0.1.The cyclic crack growth data could be fit to a Paris relationship between crack growth rate and stress-intensity range.The stress intensity factor exponent,m,in the Paris relationship was between 4 and 5,which is comparable to the relatively high values found in the literature for the tension-tension fatigue of other metallic bulk materials.Self-similarity analysis was used to explain the observed higher m values for thin metallic foils.
Fatigue testing Mode I crack growth foil
Lee Chang-Woo Liu Liu Holmes W John
Department of Advanced Analysis and Characterization,Korea Institute of Materials Science,Chang won, School of Aerospace Engineering,Beijing Institute of Technology,Beijing,100081,China International Research Center for Clean Energy Materials and Systems,Beihang University,Beijing,1001
国际会议
北京
英文
1-12
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）