SEARCH RESULT

The purpose of this work is to investigate stiffness degradation and surface roughness in the third stage resulting with breaking in commercial aluminum plates, which were subject to cantilever-type fatigue. Primarily, standard fatigue test specimens having 200x25x3mm sizes from AA1100 commercial aluminum plates have been cut. These specimens were subject to deflection-controlled cantilever-type flexural fatigue by using a high frequency as 70 Hz and a fully reversed (R =-1) strain rate. The flexural fatigue test machine, which were designed and manufactured by us, was used, in these fatigue tests. A simple test setup was designed on the tensile test machine for the measurement of stiffness degradation. Subsequently, the surface roughness and stiffness (elasticity) degradation rates of the test specimens, which damaged by fatigue test at about 10 million load-cycle (stage III) were determined. For this purpose, both surface roughness and stiffness values of samples having fatigue damage were measured in about 15-20 zones at 5 mm intervals from the fracture line. The obtained values were compared with the values, which were measured from undamaged (original) specimens. The alteration of surface roughness and stiffness degradation values depending on the distance to the fracture line were obtained for AA1100 commercial aluminum plate, and these relations are formulated. As a result of this study; it is predicted that the alteration in the surface roughness and the rigidity degradation can be regarded as an important damage criterion for the commercial aluminum plates under dynamic load.

International Conference on Advanced Technologies, Computer Engineering and Science
ICATCES

Raif Sakin Muharrem ER

The purpose of this work is to investigate stiffness degradation and surface roughness in the third stage resulting with breaking in commercial aluminum plates, which were subject to cantilever-type fatigue. Primarily, standard fatigue test specimens having 200x25x3mm sizes from AA1100 commercial aluminum plates have been cut. These specimens were subject to deflection-controlled cantilever-type flexural fatigue by using a high frequency as 70 Hz and a fully reversed (R =-1) strain rate. The flexural fatigue test machine, which were designed and manufactured by us, was used, in these fatigue tests. A simple test setup was designed on the tensile test machine for the measurement of stiffness degradation. Subsequently, the surface roughness and stiffness (elasticity) degradation rates of the test specimens, which damaged by fatigue test at about 10 million load-cycle (stage III) were determined. For this purpose, both surface roughness and stiffness values of samples having fatigue damage were measured in about 15-20 zones at 5 mm intervals from the fracture line. The obtained values were compared with the values, which were measured from undamaged (original) specimens. The alteration of surface roughness and stiffness degradation values depending on the distance to the fracture line were obtained for AA1100 commercial aluminum plate, and these relations are formulated. As a result of this study; it is predicted that the alteration in the surface roughness and the rigidity degradation can be regarded as an important damage criterion for the commercial aluminum plates under dynamic load.

International Symposium on Light Alloys and Composite Materials
UHAKS

Raif Sakin Muharrem ER Ersen Balcıoğlu