Dynamic fracture energy of polyurea-bonded steel/E-glass composite joints

作者：Kim Hyoungil; Citron Jason; Youssef George; Navarro Artemio; Gupta Vijay^*

来源：Mechanics of Materials, 2012, 45: 10-19.

DOI：10.1016/j.mechmat.2011.08.017

• Laser spallation
• J-integral
• Hygrothermal loading
• Viscoelasticity
• Thermogravimetry analysis
• Polyurea

We report dynamic fracture energy measurements for E-glass/polyurea/steel joints at a peak strain rate of 1.2 x 10(7) s(-1). Experiments were done by initiating a crack at the steel/polyurea interface by a laser-generated stress wave, whose profile was recorded using optical interferometry. The critical energy release rate or the energy delivered by the propagating stress wave to the crack-tip region at crack initiation was computed by using a wave dynamics simulation. An average value of 359 (+/- 19) J/m(2) was obtained. The effect of moisture on the fracture energy values was also examined. Results showed that the values reduced by only 3% to 349 +/- 19 J/m(2) in samples that were exposed to 75% RH at 65 degrees C for 30 days. In addition to using the data as a local failure criterion in large-scale simulation of structural joints, it can be used to estimate the residual fracture energy of the E-glass/polyurea/steel joints in service.

• 出版日期2012-2