Fatigue plays a significant role in the crack growth of the fuselage skin structures. In addition, the fuselage may suffer also from the corrosion damage, and the wear defects. The proper maintenance and scheduled test intervals can avoid the sudden skin failure. Therefore, the inspection interval has to be shortened. Nevertheless, the young machines may be also suffering from the unexpected Effect of Microstructure on Fatigue Crack Growth Fatigue crack propagation tests are conducted on magnesium alloy, cruciform specimens under biaxial and uniaxial loadings by using the biaxial fatigue tester which was developed by the authors. We investigate the effect of microstructures of specimens on fatigue crack growth resistance under biaxial stresses. From electron-microscope observations of a fatigue fracture and microstructure
To evaluate the factors affecting fatigue behavior of butt-welded joints, fatigue tests and tension tests were conducted on SM520C-TMC steels with thicknesses ranging from 20 mm to 80 mm. When the fatigue strength of 20 mm thick plate is achieved, the reduction of the fatigue strength of 80 mm thick plate by the present study is improved by over 11.7% to that of previous studies. How to Avoid Cracking in Aluminum Alloys - AlcoTecThe aluminum crack sensitivity curves (Fig 1) is a helpful tool in understanding why aluminum welds crack and how the choice of filler alloy and joint design can influence crack sensitivity. The diagram shows the effects of four different alloy additions - Silicon (Si), Copper (Cu), Magnesium (Mg) and Magnesium Silicide (Mg 2 Si) - on the crack Fracture toughness and fatigue crack growth rates of butt Abstract Fracture toughness and fatigue crack growth resistance (FCGRs) of butt-welded joints of copper and steel were measured. For this purpose, compact tension C (T) specimens were machined out from plain (unwelded) base materials and welded joints. The different zones of the welded joints viz., Ni-weld, Cu (HAZ), Steel (HAZ), interface between Cu and Ni-weld (Int.