Presentation is loading. Please wait.

Presentation is loading. Please wait.

On longitudinal compressive failure of carbon-fibre- reinforced polymer: from unidirectional to woven, and from virgin to recycled by S. T. Pinho, R. Gutkin,

Similar presentations


Presentation on theme: "On longitudinal compressive failure of carbon-fibre- reinforced polymer: from unidirectional to woven, and from virgin to recycled by S. T. Pinho, R. Gutkin,"— Presentation transcript:

1 On longitudinal compressive failure of carbon-fibre- reinforced polymer: from unidirectional to woven, and from virgin to recycled by S. T. Pinho, R. Gutkin, S. Pimenta, N. V. De Carvalho, and P. Robinson Philosophical Transactions A Volume 370(1965): April 28, 2012 ©2012 by The Royal Society

2 (a) Micrograph of a kink band. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

3 (a) Kink band propagating from right to left. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

4 Failure mode of carbon fibres during kinking: shear bands form on the side of higher compressive stress at an angle approximately 45° with the longitudinal fibre direction [8]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

5 Micromechanical FE models for the simulation of kink bands, highlighting the initial shape of every 10th fibre: (a) baseline model with mesh detail; (b) model for kink-band propagation into the initially defect-free fibres [3]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

6 The sequence of events for fibre kinking from the FE micromechanical models [3]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

7 Fibre deflection during kink-band propagation: comparison between FE micromechanical models and experimental results [3]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

8 Development of the analytical model for kink-band formation under pure longitudinal compression [9]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

9 Results from the analytical model for kink-band formation under pure longitudinal compression [9]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

10 Comparison of failure envelopes for longitudinal compression with in-plane shear, measured by four different research groups, showing high scatter and different trends [4]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

11 Micromechanical FE model with periodic boundary conditions. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

12 (a) Bimodal failure envelopes obtained using micromechanical FE models, highlighting the sensitivity to matrix constitutive properties. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

13 (a,b) Numerical predictions for bimodal failure envelopes against experimental data [10,11]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

14 (a) Equilibrium of a fibre under a longitudinal compressive force and a shear force at each end, as well as a distributed shear force across the length. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

15 Failure envelopes predicted by the analytical model (§2b(iii)) [14] against experimental data [10,11]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

16 (a–d) Shear-driven fibre compressive failure as an independent failure mode that eventually leads to kink-band formation. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

17 Complete failure envelope prediction for combined longitudinal compression and in-plane shear [14]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

18 (a) Tow failed by kinking; (b) several tows failing individually [15]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

19 Differences in failure location between different reinforcement architectures: 2×2 twill and 5H satin [15]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

20 Cross sections of (a) random-stacked, (b) IP and (c) OP laminates. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

21 Longitudinal compression in a 2×2 twill composite [15]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

22 At the microscale, compressive damage starts with microcracking/plasticity of the matrix, leading to splitting (1) at the interface of the load-aligned tows and/or within the tows. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

23 (a) Finite-element model of a 2×2 twill rUC. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

24 Kinematic models used to derive the properties of the elastic foundation [17,18]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

25 Equilibrium of a beam element. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

26 Comparison between the numerical, analytical and experimental results [16–18]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

27 Recycled composite with a multi-scale structure consisting of fibre bundles in a short-fibre- reinforced matrix [22]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

28 Compressive failure of short-fibre rCFRPs with fibre bundles [22]. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society

29 Mechanical response of a woven rCFRP: the compressive performance at the recycled composite level is shown to be insensitive to fibre strength degradation, occurring in the most aggressive recycling conditions. S. T. Pinho et al. Phil. Trans. R. Soc. A 2012;370: ©2012 by The Royal Society


Download ppt "On longitudinal compressive failure of carbon-fibre- reinforced polymer: from unidirectional to woven, and from virgin to recycled by S. T. Pinho, R. Gutkin,"

Similar presentations


Ads by Google