Stick- Slip Instabilities in Fracture

Webb, Thomas William; Aifantis, Elias C.

doi:10.1007/978-3-642-79654-8_219

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…The crack propagation velocity increases in an oscillatory and periodic manner. 25,35 The magnitude of the failure load at each stitch thread's fracture decreases with an increase in the applied displacement. This behaviour is owing to the larger distance between the position of the reacted load and crack front, and the existence of the through-the-thickness reinforcement of the stitches.…”

Section: Asymmetric Double Cantilever Beam Results Analysismentioning

confidence: 99%

“…It can be seen from Figure 15 that the load-displacement curves from the simulation and experiment results have good consistency regarding the magnitude of the ultimate load and its trend. When the load reaches the peak, the crack propagates gradually and unsteadily, in a stick-slip manner 25,35 . Moreover, the load drops sharply every time when the crack propagates, and the peak load decreases gradually with the crack propagation.…”

Section: Asymmetric Double Cantilever Beam Results Analysismentioning

confidence: 99%

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Analysis on fracture behaviour of stitched foam sandwich composites using interlaminar tension test

Sun

Wang

Liang

et al. 2021

Jnl of Sandwich Structures & Materials

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Sandwich composites are susceptible to interfacial delamination, owing to the mismatches in the material properties between the face sheets and core. Previous studies have shown that stitching can improve the performance of sandwich composites. In this study, an analysis approach was developed to investigate the fracture behaviour of stitched foam sandwich composites. The stitched foam sandwich composites were manufactured by a vacuum-assisted resin transfer moulding process. Interlaminar tension tests revealed the effects of the linear thread density on the failure mechanisms of the stitched foam sandwich composites. Asymmetric double cantilever beam tests were performed to investigate the influences of the stitch thread reinforcement on the fracture behaviour. An analytical approach combining extended finite element method and nonlinear spring elements was proposed to predict the failure behaviour of the stitched sandwich composites. Experiment and simulation approaches were employed to investigate the influences of the stitch parameters (stitch pitch and linear thread density) on the ultimate load and energy absorption. The results show that stitched method can significantly enhance the mechanical properties of sandwich composites. The energy absorption and ultimate load values of the specimens tend to increase with an increase in the linear thread density or a decrease in the stitch pitch.

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Section: Asymmetric Double Cantilever Beam Results Analysismentioning

confidence: 99%

Section: Asymmetric Double Cantilever Beam Results Analysismentioning

confidence: 99%

Analysis on fracture behaviour of stitched foam sandwich composites using interlaminar tension test

Sun

Wang

Liang

et al. 2021

Jnl of Sandwich Structures & Materials

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“…Moreover, the unstable crack propagation makes the interpretation of the test results rather difficult and the comparison with unidirectional materials questionable. The stick-slip behaviour has been treated from a theoretical point of view by different researchers such as in [15], [16], [17], [18], [19]. Hine et al reported that unstable crack propagation in woven fabric composites is caused by local regions of high toughness [20].…”

Section: Introductionmentioning

confidence: 99%

Interlaminar fracture toughness of 5HS Carbon/PEEK laminates. A comparison between DCB, ELS and mandrel peel tests

Sacchetti

Grouve²,

Warnet

et al. 2018

Polymer Testing

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The present work focuses on the applicability of the mandrel peel test to quantify the interlaminar fracture toughness of 5 harness satin woven fabric carbon/PEEK composites. For this purpose, the Mandrel Peel (MP) test was compared to the Double Cantilever Beam (DCB) and End-Loaded Split (ELS) test in terms of experimental procedure and obtained results. The interlaminar toughness of the 5 harness carbon/PEEK was measured both parallel and perpendicular to the predominant fibre direction at the interface. While stable crack propagation was observed in the ELS test, unstable crack propagation (stick-slip) was observed during both the DCB and the mandrel peel tests. In the case of the mandrel peel test, however, the unstable propagation was immediately arrested by the mandrel, limiting the instability and providing numerous crack re-initiation values per unit of crack length. This effect is expected to increase the statistical relevance of a single test and thereby to increase the reliability of the measured values as compared to DCB tests. A fractographic analysis was performed to study the nature of the crack propagation for the different testing techniques. The mandrel peel test was found to be a potentially plausible alternative to the DCB test for woven fabric reinforced composites.

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