[home] [Personal Program] [Help]

---

Session: Poster pitches day 1
Session starts: Monday 26 June, 09:50
Presentation starts: 09:50

---

Fangli Wang ()
Kai Liu ()
Qiang Zhu ()
Mingbo Tong ()

Abstract:
Based on enhanced test of crack extended about random load spectrum, the stress intensity factor, critical crack length, fast calculation of crack growth life and load spectrum enhanced factoraccurate selection of two panels under different enhanced factors are analyzed systematically by numerical simulation and random load spectrum crack enhanced program calculation. The results show that in a small range of elastoplasticity, the stress intensity factor after enhanced is the enhanced multiple of the original load spectrum stress intensity factor. If it is in the high load plastic deformation area, the effective value of the stress intensity factor is obtained by subtracting the threshold value after the increase of the multiple. The critical crack length of two panels decreases with the increase of load spectrum enhanced coefficient, and the decrease speed of large panel is faster than that of small panel. When the enhanced coefficient is small„ the enhanced spectrum life / original spectrum life ratio curves of different load spectrum and sizes are all consistent after normalization treatment, and a formula is proposed. According to this conclusion, the crack growth life of the original load spectrum can be calculated quickly or the enhanced factor can be selected quickly when the shortening time of fatigue accelerated test is known; it can also be applied to the prediction of the relevant pa-rameters required for the random spectrum of large samples based on the calculation of constant amplitude spectrum of small samples and the test results, so as to reduce the cost and time of test.