MCE 230 - Fatigue Test - Abstract: Three samples of...

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Abstract: Three samples of unpolished aluminum and three samples of unpolished copper were used in the fatigue test. Under an applied load of 80 N, the first sample of aluminum fractured after 13892 load cycles. Similarly, the second sample of aluminum fractured under an applied load of 110 N after 2397 load cycles. A load of 120 N was applied to the third sample of aluminum and it fractured after 2442 load cycles. The same test was performed on three samples of copper. The first sample was put under a load of 80 N and fractured after 34826 load cycles. The second sample was put under a load of 100 N and fractured after 4319 load cycles. The third sample was put under a load of 120 N and fractured after 2625 load cycles. Introduction: Fatigue is a form of failure that occurs in structures subjected to repeated cyclic stress. A material that is subjected to this repeated cyclic stress may fracture due to material fatigue. Thus, it is possible for failure to occur at a stress level considerably lower than the tensile or yield strength for a static load. The fatigue test is used to predict fatigue lifetimes of components. Theory: M b = F . a W b = π d 3 32 σ a = M b W b
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F: Concentrated Force a: Length of the bigger portion of the sample M b : Bending moment W b : Section modulus of the sample σ a : Alternating stress amplitude Experimental equipment: The revolving fatigue testing machine consists of a spindle with sample
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MCE 230 - Fatigue Test - Abstract: Three samples of...

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