Effects of Z-pin on moisture absorption property and damage mode under flexural load for carbon fiber composite

Abstract The effect of carbon fiber Z-pin on carbon fiber composite under moisture condition with and without flexural load was investigated in this work. Moisture absorption property and crack propagation of carbon fiber reinforced epoxy matrix composite and Z-pinned composite were evaluated under moisture only and moisture-coupled load conditions. The moisture property was evaluated by moisture content and microscopic morphology obtained using X-ray micro-computed tomography (X-ray μCT). The microstructures inside composites and Z-pinned composites after moisture conditions and three-point flexural test were detected using X-ray μCT and optical microscope. It illustrates that the moisture content of Z-pinned composites is higher due to the rich-resin pocket brought by the implantation of Z-pin. The cracks are obvious inside Z-pinned composites after moisture-coupled load conditions. It is attributed to the implantation of each pin which is the weak point for stress concentration and crack formation. Failure morphologies on the surface of composites and Z-pinned composites are different under different moisture conditions. Less macro-interlayer cracks are detected on the surface of Z-pinned composites, and plenty of microcracks initiating from pins are observed.

[1]  H. Adin,et al.  Effect of particles on tensile and bending properties of jute epoxy composites , 2022, Materials Testing.

[2]  malceteg.  Mechanical and Industrial Engineering , 2018, Materials Forming, Machining and Tribology.

[3]  Yubo Zhou,et al.  Tuning interlaminar fracture toughness of fine z-pin reinforced polymer composite , 2021, Materials & Design.

[4]  Weiwei Wang,et al.  Effect of Ø 0.11 mm Z-pinning on the properties of composite laminates via an ultrasound guided insertion process , 2021 .

[5]  Weiwei Wang,et al.  Micro-damage initiation evaluation of z-pinned laminates based on a new three-dimension RVE model , 2021 .

[6]  Lixin Wu,et al.  In situ formation of a carbon nanotube buckypaper for improving the interlaminar properties of carbon fiber composites , 2021 .

[7]  G. Scharr,et al.  Compression properties of z-pinned carbon-fibre/epoxy laminates reinforced with circumferentially notched z-pins , 2021 .

[8]  A. Akhavan‐Safar,et al.  Environmental effects on mode II fracture toughness of unidirectional E-glass/vinyl ester laminated composites , 2021, Science and Engineering of Composite Materials.

[9]  Y. Lei,et al.  Modified Halpin–Tsai equation for predicting interfacial effect in water diffusion process , 2021 .

[10]  K. Potter,et al.  Minimizing the in-plane damage of Z-pinned composite laminates via a pre-hole pin insertion process , 2020 .

[11]  Puhui Chen,et al.  A numerical study of the influence of Z-pin parameters on the elastic properties of laminates , 2020, Polymers and Polymer Composites.

[12]  Guoqiang Li,et al.  Vitrimer based composite laminates with shape memory alloy Z-pins for repeated healing of impact induced delamination , 2020 .

[13]  Changyou Li,et al.  Static compression testing CFRP single-lap composited joints using X-ray μCT , 2020 .

[14]  Robert A. Smith,et al.  A parametric study of segmentation thresholds for X-ray CT porosity characterisation in composite materials , 2019, Composites Part A: Applied Science and Manufacturing.

[15]  Yunhe Zhang,et al.  Microstructure and Flexural Properties of Z-Pinned Carbon Fiber-Reinforced Aluminum Matrix Composites , 2019, Materials.

[16]  R. Ameta,et al.  Green Composites , 2019, Materials Horizons: From Nature to Nanomaterials.

[17]  Mark E. Robeson,et al.  Delamination resistance of composite laminated structures reinforced with angled, threaded, and anchored Z-pins , 2018, Journal of Composite Materials.

[18]  J. Hoffmann,et al.  Compression properties of composite laminates reinforced with rectangular z-pins , 2018, Composites Science and Technology.

[19]  António R. Melro,et al.  Inter-fibre failure of through-thickness reinforced laminates in combined transverse compression and shear load , 2018, Composites Science and Technology.

[20]  J. Hoffmann,et al.  Mechanical properties of composite laminates reinforced with rectangular z-pins in monotonic and cyclic tension , 2018 .

[21]  P. Wang,et al.  Through-the-thickness reinforcement for composite structures: A review , 2018 .

[22]  P. Davies,et al.  An experimental study of water diffusion in carbon/epoxy composites under static tensile stress , 2018 .

[23]  Yong Li,et al.  Failure analysis and strengthening mechanism of Z-pinned composite T-joints under tensile loading , 2017 .

[24]  F. Chiang,et al.  Time-dependent changes in mechanical properties of carbon fiber vinyl ester composites exposed to marine environments , 2016 .

[25]  W. Guo,et al.  Tensile strength of Z-pinned laminates in RTD and hot-wet environment , 2015 .

[26]  A. Mouritz,et al.  Mode II interlaminar fatigue properties of z-pinned carbon fibre reinforced epoxy composites , 2014 .

[27]  A. Mouritz.  Structural properties of z-pinned carbon-epoxy T-joints in hot-wet environment , 2014 .

[28]  G. Scharr,et al.  Flexural properties of z-pinned composite laminates in seawater environment , 2014, Journal of Materials Science.

[29]  A. Mouritz,et al.  Improving the mode I delamination fatigue resistance of composites using z-pins , 2014 .

[30]  A. Mouritz,et al.  Re-evaluation of mode I bridging traction modelling for z-pinned laminates based on experimental analysis , 2014 .

[31]  S. Fréour,et al.  A moisture diffusion coupled model for composite materials , 2013 .

[32]  A. Mouritz.  Delamination properties of z-pinned composites in hot–wet environment , 2013 .

[33]  A. Mouritz.  Environmental durability of z-pinned carbon fibre–epoxy laminate exposed to water , 2012 .

[34]  Zhansheng Guo,et al.  Prediction of compressive strength of z-pinned unidirectional composite laminates , 2012 .

[35]  A. Mouritz,et al.  A mechanistic interpretation of the comparative in-plane mechanical properties of 3D woven, stitched and pinned composites , 2010 .

[36]  A. Mouritz,et al.  Tension fatigue of fibre-dominated and matrix-dominated laminates reinforced with z-pins , 2010 .

[37]  Adrian P. Mouritz,et al.  Review of z-pinned composite laminates , 2007 .

[38]  A. Mouritz,et al.  Flexural properties of z-pinned laminates , 2007 .

[39]  Brian N. Cox,et al.  Properties and failure mechanisms of z-pinned laminates in monotonic and cyclic tension , 2006 .

[40]  Marcus Schneider,et al.  The combined effects of load, moisture and temperature on the properties of E-glass/epoxy composites , 2005 .

[41]  G. Marom,et al.  Stress dependence of the coefficient of moisture diffusion in composite materials , 1985 .