A damage model for 3D braided composites with transverse cracking

When stress is high, delaminate damage can be induced by transverse cracks. A complete parabolic shear-lag damage model containing delamination induced by transverse cracks is therefore proposed and applied to predict the stiffness reduction by transverse cracking in cross-ply laminated composite materials. The predictions of the complete parabolic shear-lag analysis model, the incomplete parabolic shear-lag analysis model, and the complete parabolic shear-lag damage model containing delamination proposed in this paper have been compared. Results show that the young’s modulus reduction values obtained by our analysis model are better agreement with the experimental ones than other models.

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Impact tensile behavior and frequency response of 3D braided composites

Textile Research Journal ◽

10.1177/0040517511427970 ◽

2011 ◽

Vol 82 (3) ◽

pp. 280-287 ◽

Cited By ~ 14

Author(s):

Xuehui Gan ◽

Jianhua Yan ◽

Bohong Gu ◽

Baozhong Sun

Keyword(s):

High Strain Rate ◽

Strain Rate ◽

Tensile Properties ◽

High Strain ◽

Tensile Modulus ◽

Tensile Failure ◽

Uniaxial Tensile ◽

Strain Rates ◽

Braided Composites ◽

3D Braided Composites

The uniaxial tensile properties of 4-step 3D braided E-glass/epoxy composites under quasi-static and high-strain rate loadings have been investigated to evaluate the tensile failure mode at different strain rates. The uniaxial tensile properties at high strain rates from 800/s to 2100/s were tested using the split Hopkinson tension bar (SHTB) technique. The tensile properties at quasi-static strain rate were also tested and compared with those in high strain rates. Z-transform theory is applied to 3D braided composites to characterize the system dynamic behaviors in frequency domain. The frequency responses and the stability of 3D braided composites under quasi-static and high-strain rate compression have been analyzed and discussed in the Z-transform domain. The results indicate that the stress-strain curves are rate sensitive, and tensile modulus, maximum tensile stress and corresponding tensile strain are also sensitive to the strain rate. The tensile modulus, maximum tensile stress of the 3D braided composites are linearly increased with the strain rate. With increasing of the strain rate (from 0.001/s to 2100/s), the tensile failure of the 3D braided composite specimens has a tendency of transition from ductile failure to brittle failure. The magnitude response and phase response is very different in quasi-static loading with that in high-strain rate loading. The 3D braided composite system is more stable at high strain rate than quasi-static loading.

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Research on Fabricating Technology of Three Dimensional Integrated Braided Composite I Beam

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.136.59 ◽

2010 ◽

Vol 136 ◽

pp. 59-63 ◽

Cited By ~ 1

Author(s):

X.Y. Pei ◽

Jia Lu Li

Keyword(s):

Cross Section ◽

High Performance ◽

Research Result ◽

Three Dimensional ◽

Void Content ◽

Braided Composites ◽

Braided Composite ◽

Transfer Molding ◽

3D Braided Composites

In this paper the fabricating technology of three dimensional (3D) integrated braided composite I beam is researched, including: braiding technology of 3D braided I beam preform, the orientation of fiber-tow in the I beam preform, the optimizing of process parameters of resin transfer molding (RTM) for 3D braided composite I beam, and the design of mould for consolidation of composite I beam. The quality of 3D braided composites is good analyzed by ultrasonic A-scan, void content calculation and microscope observation. The research result will provide a good way for designing and fabricating high performance 3D integrated braided composite components with irregular cross section.

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