期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 155, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106612
关键词
Fatigue crack growth; Polymer-matrix composites; Micromechanics; Fiber bridging; Delamination
资金
- National Science Foundation, USA CMMI MoM [2111-001-01, N68335-19-C-0546]
- DOE Office of Science by Argonne National Laboratory [1662554]
- [DE-AC02-06CH11357]
A compact tension T650/5320 laminate composite was characterized using in-situ X-ray tomography to analyze the damage mechanisms during cyclic loading. The 3D image processing analysis revealed the presence of intralaminar cracking and delamination facilitating ply cross-over. A finite element analysis was conducted to compute the change in stored energy per cycle, dU/dN, which showed that the observed intralaminar crack growth rates collapsed to a single curve.
To assist in damage tolerant analyses for composites, a compact tension T650/5320 laminate composite was characterized via in-situ X-ray tomography during cyclic loading. A 3D image processing analysis of the fatigue crack growth illustrated the various damage mechanisms, including intralaminar cracking (dominant) and delamination facilitating ply cross-over. A finite element analysis was conducted to compute the change in stored energy per cycle, dU/dN, which showed that the experimentally observed intralaminar crack growth rates, per ply, collapsed to a single dU/dN curve, where direct observations of fiber bridging were associated with a reduction in crack growth rate for the influenced ply.
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