Analysis of low cycle fatigue in titanium materials 15-3-3-3

Abstract

Abstract Microstructure changes of the properties of welded material effects the strength of the welds resulting in cracks and fractures in the weld joints. The 15-3-3-3 titanium alloy has excellent formability and is also cost effective in the fabrication process when compared to any other type materials. Low cycle fatigue is the dominant failure in titanium materials, requiring consideration of the design and analysis of material life. Low cycle fatigue test performed on tig welding of plate-shaped titanium material. Cyclic hardening causes an increase in the peak stress with the cycle, while cyclic softening results in decreasing the seek rate with the cycle. Cyclic loading which produces plastic strain is described as more complex and forms a hysteresis loop. Analysis of the hysteresis loop needs to analyze the stress distributions using the raindrop method in order to obtain a hysteresis loop pattern. The hysteresis loops consistently show the behavior of the material. behavior of the material. Hysteresis loop were analyzed to study the LCF property. Titanium material exhibits toughness from the start of the cycle to the end of the cycle. Second before the ‘material failure’ happens, it doesn’t show any drastic decrease in quality in the term of toughness.