FATIGUE TEST RESULTS OF TWO FULL-SCALE WING CENTER SECTIONS UNDER GROUND-TO-AIR CYCLE LOADING

摘要

Fatigue tests were conducted on two full scale wing center sections. In a previous program 8 similar specimens had been tested, two at each of the following load sequenoest (l) random load, (2) programmed load, (3) random load with ground-to-air cycles, (4) programmed load with ground-rto-air cycles. The present two tests consist of ground-to-air cycles (OTAC) only.nThe following trends were observedi (l) the picture of fatigue critical cracks was somewhat different in the OTAC tests than in the eight previous tests, (2) the damaging effeot of OTAC of the previous tests reasonably obeys the linear damage rule.