Caustics method in dynamic fracture problem of orthotropic materials

Gong, Kezhuang; Li, Zheng

doi:10.1016/j.optlaseng.2008.03.019

Cited by 29 publications

(10 citation statements)

References 9 publications

(9 reference statements)

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“…investigated the dynamic fracture toughness and the crack growth velocity of polypropylene/nylon‐6 (PP/PA6) blends with different weight fractions and different compatibilizers by means of the reflected dynamic caustic experiments. Gong et al 37–39 . studied dynamic mode I and mixed‐mode fracture problems of typical glass fibre‐reinforced composites using the caustics, which indicated that the arrangement of fibre has a larger influence on the fracture process than the volume ratio of fibres.…”

Section: Impact Response and Dynamic Fracture Of Composite Materialsmentioning

confidence: 99%

Recent application of caustics on experimental dynamic fracture studies

Yao

Wang

2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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A B S T R A C T Combining the caustic method with high-speed photography is an efficient optical measurement technique to study the dynamic fracture behaviours of homogenous and isotropic material. In the last decade, the main emphasis is extended to study dynamic fracture of anisotropic material and dynamic propagation of multi-cracks and interface cracks in practical engineering materials. In this paper, the recent advances and applications about the dynamic caustic method in China are reviewed, such as impact response and dynamic fracture of composite materials (fibre composites, functionally gradient materials and nanometre composites), and dynamic interaction and propagation of multicracks and interface cracks. Particularly, some new numerical methods were developed to solve the complicated caustic equations by introducing both the maximum characteristic size and the relevant angles in caustic patterns. Also, some important experimental results in fracture mechanics are described, and the potential research prospects about dynamic caustics are included as well.

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Section: Impact Response and Dynamic Fracture Of Composite Materialsmentioning

confidence: 99%

Recent application of caustics on experimental dynamic fracture studies

Yao

Wang

2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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“…2. The shadow spot patterns of caustic method are recorded during can be measured, and the dynamic SIF can be determined [7] and shown in Fig. 4.…”

Section: Dynamic Caustics Experimentsmentioning

confidence: 99%

“…In terms of the applications of caustic method in fiber reinforced composites, Yao X F et al studied on mode I crack fracture of glass-fiber-woven epoxy composites under dynamic three-point-bending impact [5] . Gong K et al determined the stress intensity factors around a moving mode I crack tip by caustic method [6] , and then developed this optical method into mixed mode fracture of orthotropic materials [7] .…”

Section: Introductionmentioning

confidence: 99%

Experimental study on mixed mode fracture in unidirectional fiber reinforced composites

Gong

2008

SPIE Proceedings

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Fiber reinforced composites are applied broadly in aeronautic and astronautic fields as a structural material. But the investigation in dynamic fracture behavior of fiber reinforced composite stands in the breach for scientists due to a large number of aircraft disasters. In this paper, the mixed mode fracture problems in fiber reinforced composites under impact are studied. First, based on the theory of the reflective dynamic caustic method for mixed mode fracture, corresponding experiments are carried out to study the dynamic fracture behaviors of unidirectional fiber reinforced composites under two kinds load conditions. By recording and analyzing the shadow spot patterns during the crack propagation process carefully, the dynamic fracture toughness and crack growth velocity of fiber reinforced composites are obtained. Via the observation of the crack growth routes and fracture sections, we further reveal the fracture mechanism of unidirectional fiber reinforced composites. It concludes that opening mode still is the easier fracture type for the pre-crack initiation in fiber reinforced composites, while the interface between fibers and matrix becomes the fatal vulnerability during the crack propagation.

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“…Papadopoulos [7] applied the method of caustics to the elastodynamic problems of propagating cracks in composites. Yao et al [8] and Gong and Li [9] recently studied the dynamic fracture problem of orthotropic materials by the method of caustics. Zhang et al [10] discussed the local singularities near the crack tip of the neat polypropylene (PP) and polypropylene/CaCO 3 nanocomposites by the optical method of caustics.…”

Section: Introductionmentioning

confidence: 99%