Hi David & Prasad, Some years back we in the IEEE Compliant Lead Task Force did mechanical cycling at 23, 50 and 81oC at cyclic frequencies ranging from 60 to 14,400 cycles per day (2.5 to 600 cycles/hour) producing dwell times ranging from 12 minutes to 3 seconds; even with short dwells at room temperature the fatigue regime was clearly low-cycle fatigue with domination by creep. Werner Engelmaier Engelmaier Associates, Inc. Electronic Packaging, Interconnection and Reliability Consulting 23 Gunther Street Mendham, NJ 07945 USA Phone & Fax: 973-543-2747 E-mail: [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************