Transient analysis of the DSIFs and dynamic T-stress for particulate composite materials—Numerical vs. experimental results

Guduru, V.; Phan, A.-V.; Tippur, Hareesh V.

doi:10.1016/j.enganabound.2010.04.010

Cited by 7 publications

(5 citation statements)

References 24 publications

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“…CMOD is often used to characterize the fracture behaviors (Guduru et al., 2010). Figure 19(a) and (b) shows the CMOD–time curves obtained from the quasi-static and impact fracture test, respectively.…”

Section: Resultsmentioning

confidence: 99%

Comparisons on impact fracture behavior between three-dimensional four directional and five directional braided composite materials

Shi

Liu

Siddique

et al. 2018

International Journal of Damage Mechanics

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Fracture behaviors of three-dimensional braided composites could be designed from braided preform structures. Here, we compare the fracture behaviors of three-dimensional four direction (3D4d) and five directional (3D5d) braided composites under impact loading. A drop weight impact tester combined with a high-speed photography system was employed to characterize the progressive damages and fracture behaviors, which include crack growth and crack mouth opening displacement. The two-dimensional digital image correlation method was utilized for evaluating deformation contours and strain field. A finite element analyses model was established to reveal impact damage evolution, crack growth, stress distribution, and energy absorption at microstructure level. We found that axial yarns had great effect on the crack propagation paths. The stress at the notch bottom caused yarn breakage and then resulted in a sharply growing crack. The axial yarns in the 3D5d braided composites impede the progress of cracks under transverse impact. The 3D5d braided composites have smaller crack mouth opening displacement than that of the 3D4d composites. The braided preform is the main energy absorption component. With the same volume fraction, axial yarns exhibit the highest energy absorption. Due to the existence of axial yarns, the resistance to the fracture and crack growth of the 3D5d braided composites is better than the 3D4d braided composites.

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Section: Resultsmentioning

confidence: 99%

Comparisons on impact fracture behavior between three-dimensional four directional and five directional braided composite materials

Shi

Liu

Siddique

et al. 2018

International Journal of Damage Mechanics

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“…According to the previous studies (Guduru et al., 2010), the CMOD is often used to characterize the fracture behaviors. Here we used a high-speed photography camera to record the CMOD of the 3D braided composite U-notched beam.…”

Section: Methodsmentioning

confidence: 99%

Impact fracture behaviors of three-dimensional braided composite U-notch beam subjected to three-point bending

Shi

Liu

Siddique

et al. 2018

International Journal of Damage Mechanics

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Impact fracture behaviors of three-dimensional braided composites are critical to designing the braided composite parts. Here we report the impact fracture behaviors of three-dimensional braided composite U-notch beam tested on a modified split Hopkinson pressure bar. Crack mouth opening displacement, deformation process, and crack evolutions were recorded with high-speed photography camera. The digital image correlation method was used to calculate deformation contours of the braided composite. A microstructure model of the three-dimensional braided composite U-notch beam was established for analyzing damage evolution and fracture mechanisms. The histories of deformation, the load, and the crack mouth opening displacement were obtained from the impact fracture test and finite element analysis. It was found that the impact fracture resistance and morphologies were influenced by the braided structure and braided yarn orientations. The crack generated at the notch tip and then propagated along the braided angle direction rather than the perpendicular direction that often occurred for isotropic materials, such as the epoxy resin solid. The combinations of different braided angle and yarns are recommended for high impact fracture behavior design.

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“…Frequency domain analysis of cracks, such as the analysis of the dynamic stress intensity factors (DSIFs) and dynamic T -stress (DTS), using the SGBEM has been investigated and reported in [16][17][18][19] where the standard FFT algorithm was …”

Section: Fracture Analysis By the Sgbem For Fourier-space Elastodynamicsmentioning

confidence: 99%

“…In addition to important achievements of the SGBEM for stress and fracture analysis in elastostatics, the SGBEM has recently been developed for elastodynamics (e.g., [13][14][15][16][17][18][19]. However, only damped systems were studied in papers [15][16][17][18][19] as the standard FFT algorithm was used to obtain transient responses.…”

Section: Introductionmentioning

confidence: 99%

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Frequency domain analysis by the exponential window method and SGBEM for elastodynamics

et al. 2011

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Dynamic analysis of a system can be carried out either in the time or frequency domain. Time responses/ histories of this system may be directly obtained using timedomain analysis. In case of frequency domain analysis in the Fourier space, the inverse fast Fourier transform (inverse FFT) would naturally be an appropriate choice for converting frequency solutions to the desired time responses. However, the standard FFT can not be applied to undamped systems as the free-vibration terms of these systems never decay which violates the periodic nature of the standard FFT algorithm. In addition, the FFT may be computationally expensive for lightly damped systems. An alternative to overcome the above limitations is the so-called exponential window method (EWM) commonly used in digital signal processing. This paper presents a combination of the EWM and the symmetric-Galerkin boundary element method for 2-D elastodynamic analysis in the frequency domain of undamped and lightly damped systems. Several numerical examples, including fracture problems, are given to illustrate the efficiency and accuracy of the proposed frequency domain analysis.

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Transient analysis of the DSIFs and dynamic T-stress for particulate composite materials—Numerical vs. experimental results

Cited by 7 publications

References 24 publications

Comparisons on impact fracture behavior between three-dimensional four directional and five directional braided composite materials

Comparisons on impact fracture behavior between three-dimensional four directional and five directional braided composite materials

Impact fracture behaviors of three-dimensional braided composite U-notch beam subjected to three-point bending

Frequency domain analysis by the exponential window method and SGBEM for elastodynamics

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