TY - JOUR
T1 - Experimental and FEM study of thermal cycling induced microcracking in carbon/epoxy triaxial braided composites
AU - Zhang, Chao
AU - Binienda, Wieslaw K.
AU - Morscher, Gregory N.
AU - Martin, Richard E.
AU - Kohlman, Lee W.
PY - 2013
Y1 - 2013
N2 - The microcrack distribution and mass change in T700s/PR520 and T700s/3502 carbon/epoxy braided composites exposed to thermal cycling was evaluated experimentally. Acoustic emission was utilized to record the crack initiation and propagation under cyclic thermal loading between -55 °C and 120 °C. Transverse microcrack morphology was investigated using X-ray computed tomography. The differing performance of two kinds of composites was discovered and analyzed. Based on the observations of microcrack formation, a meso-mechanical finite element model was developed to obtain the resultant mechanical properties. The simulation results exhibited a decrease in strength and stiffness with increasing crack density. Strength and stiffness reduction versus crack densities in different orientations were compared. The changes of global mechanical behavior in both axial and transverse loading conditions were studied. By accounting for the obtained reduction of mechanical properties, a macro-mechanical finite element model was utilized to investigate the influence of microcracking on the high-speed impact behavior.
AB - The microcrack distribution and mass change in T700s/PR520 and T700s/3502 carbon/epoxy braided composites exposed to thermal cycling was evaluated experimentally. Acoustic emission was utilized to record the crack initiation and propagation under cyclic thermal loading between -55 °C and 120 °C. Transverse microcrack morphology was investigated using X-ray computed tomography. The differing performance of two kinds of composites was discovered and analyzed. Based on the observations of microcrack formation, a meso-mechanical finite element model was developed to obtain the resultant mechanical properties. The simulation results exhibited a decrease in strength and stiffness with increasing crack density. Strength and stiffness reduction versus crack densities in different orientations were compared. The changes of global mechanical behavior in both axial and transverse loading conditions were studied. By accounting for the obtained reduction of mechanical properties, a macro-mechanical finite element model was utilized to investigate the influence of microcracking on the high-speed impact behavior.
KW - A. Polymer-matrix composites (PMCs)
KW - B. Environmental degradation
KW - B. Impact behaviour
KW - B. Transverse cracking
UR - http://www.scopus.com/inward/record.url?scp=84869872013&partnerID=8YFLogxK
U2 - 10.1016/j.compositesa.2012.10.006
DO - 10.1016/j.compositesa.2012.10.006
M3 - 文章
AN - SCOPUS:84869872013
SN - 1359-835X
VL - 46
SP - 34
EP - 44
JO - Composites Part A: Applied Science and Manufacturing
JF - Composites Part A: Applied Science and Manufacturing
IS - 1
ER -