2009CJY

葉昶志 (Chang-Jhih Yeh)

Fatigue Property Investigation on Electroplated Ni and Ni-diamond Nanocomposite

電鍍鎳及電鍍鎳-鑽奈米複合材料之疲勞特性研究

In this study, cantilever beams are fabricated by electroplated Ni and Ni-diamond nanocomposite. A MTS micro-force testing machine (Tytron 250) with a probe is adopted for bending test and fatigue test.

In the test beam design, a cantilever beam with a contact hole is included to improve the quality of the test data.

In the bending test, a load-displacement curve is obtained and the Ni-diamond nanocomposite is about 1.2 times the proportional limit of the pure electroplated nickel. In addition, the stiffness, as well as the Young’s modulus, of Ni-diamond nanocomposite is higher than pure electroplated nickel, and this result is insistent with previously reported results.

In the fatigue test, the S-N curve is obtained. The Young’s modulus of electroplated Ni and Ni-diamond nanocomposite are measured by the means of the nanoindentation test. In the same proportional loading of maximum displacement (ex. 89% δmax), the pure electroplated nickel is about 5 times the fatigue life of Ni-diamond nanocomposite. When the same displacement is applied (ex. 16 μm), the pure electroplated nickel is about 3 times the fatigue life of Ni-diamond nanocomposite. Similarly, when the same force is applied (ex. 50 mN), as well as the stress, the pure electroplated nickel is about 3 times the fatigue life of Ni-diamond nanocomposite. In addition, the endurance ratio of pure electroplated Ni and Ni-diamond nanocomposite are 0.69 and 0.46, respectively.

[1] C.-S. Huang, Y.-T. Cheng, C.-J. Yeh, H.-K. Liu, and W. Hsu (June 2009). Young’s modulus and fatigue lifetime improvements by diamond size effect on electroplated Ni-diamond nanocomposite, The 15th International Conference on Solid-State Sensors, Actuators and Microsystems, Denver, U.S.A..