Morrow, ASTM-STP 378 (Philadelphia, PA: ASTM, 1965), pp. (Ann Arbor, MI: University of Michigan Press, 1953), pp. Manson, Behavior of Materials under Conditions of Thermal Stress, Heat Transfer Symp. JSMS Standards, JSMS-SD-3-00: Standard Method for Low Cycle Fatigue Testing of Solder Materials (Kyoto: Japan: The Society of Material Science, 2000), pp. 613–625.ĪSTM standards, ASTM E606: Standard Practice for Strain-Controlled Fatigue Testing (Philadelphia, PA: ASTM, 1998), vol. The frequency-modified Coffin-Manson model could not describe the influence of temperature on LCF behavior, while the flow stress-modified frequency-modified Morrow energy model, into which the metallurgical response (flow stress and frequency) was introduced to account for the effect of temperature and frequency on LCF behavior, gave reasonable predictions of LCF data under various temperatures and frequencies. In order to better correlate the LCF data, a flow stress and/or frequency-dependent modifications were introduced to the Coffin-Manson and Morrow energy models.
The LCF behavior represented by the present prediction models showed temperature and frequency dependences, i.e., the fatigue ductility coefficient increased with increasing frequency and decreasing temperature. Low-cycle fatigue (LCF) data of Sn-Ag eutectic solder (96.5Sn-3.5Ag) under various temperatures and frequencies has been described using three different prediction models, i.e., Coffin-Manson model, Smith-Watson-Topper (SWT) model, and Morrow energy model.
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