Low cycle fatigue analysis of temperature and frequency effects in eutectic solder alloy

✍ Scribed by X.Q Shi; H.L.J Pang; W Zhou; Z.P Wang

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 418 KB
• Volume: 22
• Category: Article
• ISSN: 0142-1123
• DOI: 10.1016/s0142-1123(99)00124-3

✦ Synopsis

Low cycle isothermal mechanical fatigue testing of a eutectic alloy 63Sn/37Pb was carried out in a systematic manner over a wide range of frequencies (10 Ϫ4 -1 Hz) and temperatures (Ϫ40 to 150°C) with the total strain set at different values (1-50%). The low cycle fatigue behavior of the eutectic solder was found to be strongly dependent on test temperature and frequency. If the Coffin-Manson model is used to describe such fatigue behavior, the fatigue exponent m and ductility coefficient C in the model are found to be a function of temperature and frequency rather than numerical constants. The plastic flow law was employed to explain the temperature and frequency dependence. The frequency-modified Coffin-Manson model was tried and found to be able to eliminate the frequency dependence of the numerical "constants" but not the temperature dependence. To have a full description of the temperature-and frequency-dependent fatigue behavior, a set of empirical formulae was derived based on the frequencymodified Coffin-Manson model.