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Dr Xiaodong Xu's Outputs (43)

Investigation of fracture process zone development in quasi-isotropic carbon/epoxy laminates using in situ and ex situ X-ray Computed Tomography (2022)
Journal Article

Trans-laminar fracture toughness is an important property of laminated composites and examining the fracture process zone at the tip of a crack is key to understanding it. To date, little research has been done on in-depth examination of the early fr... Read More about Investigation of fracture process zone development in quasi-isotropic carbon/epoxy laminates using in situ and ex situ X-ray Computed Tomography.

Identifying fibre orientations for fracture process zone characterization in scaled centre-notched quasi-isotropic carbon/epoxy laminates with a convolutional neural network (2022)
Journal Article

This paper presents a novel X-ray Computed Tomography (CT) image analysis method to characterize the Fracture Process Zone (FPZ) in scaled centre-notched quasi-isotropic carbon/epoxy laminates. A total of 61 CT images of a small specimen were used to... Read More about Identifying fibre orientations for fracture process zone characterization in scaled centre-notched quasi-isotropic carbon/epoxy laminates with a convolutional neural network.

Initial R-curves for translaminar fracture of quasi-isotropic carbon/epoxy laminates from specimens with increasing size (2021)
Journal Article

In this paper, a set of initial R-curves were measured for three different in-plane sizes using scaled Over-height Compact Tension (OCT) specimens and two different stacking sequences. The data reduction scheme was based on a Virtual Crack Closure Te... Read More about Initial R-curves for translaminar fracture of quasi-isotropic carbon/epoxy laminates from specimens with increasing size.

Delamination suppression in tapered unidirectional laminates with multiple ply drops using a tape scarfing technique (2021)
Journal Article

Composite laminate thickness tapering is essential for weight efficient structures. This is achieved by terminating specific plies, but these can in turn act as sites for delamination initiation. One area of importance is the spacing between adjacent... Read More about Delamination suppression in tapered unidirectional laminates with multiple ply drops using a tape scarfing technique.

The role of broken fibres on crack migration into 0° surface plies in adhesively bonded carbon fibre composite joints (2021)
Journal Article

Crack migration into the composite in adhesively bonded joints can cause a major degradation of strength. This usually occurs via cracks in the surface plies, but this paper demonstrates that crack migration can occur in joints even with 0° surface p... Read More about The role of broken fibres on crack migration into 0° surface plies in adhesively bonded carbon fibre composite joints.

Numerical analysis of high velocity, oblique impacts and residual tensile strength of carbon/epoxy laminates (2020)
Journal Article

This paper presents prediction of the high velocity, oblique impact response and quasi-static residual tensile strength of thin [45/90/−45/0]2s carbon/epoxy laminates using finite element (FE) models. A High-Fidelity Finite Element Method (Hi-FEM) wi... Read More about Numerical analysis of high velocity, oblique impacts and residual tensile strength of carbon/epoxy laminates.

Virtual characterization of nonlocal continuum damage model parameters using a high fidelity finite element model (2020)
Journal Article

A virtual finite element framework is presented to provide the transition from a high fidelity model to a more computationally efficient continuum model for simulating fibre-dominated damage behavior in composite laminates subjected to tensile loadin... Read More about Virtual characterization of nonlocal continuum damage model parameters using a high fidelity finite element model.

Novel tape termination method for automated fibre placement: Cutting characteristics and delamination suppression (2020)
Journal Article

A novel tape termination method for tapering the ply end and removing the fibre discontinuity owing to a dropped ply in a tapered composite was demonstrated. The forces required for this process – referred to as tape scarfing – were experimentally in... Read More about Novel tape termination method for automated fibre placement: Cutting characteristics and delamination suppression.

An experimental study of scaling effects in notched quasi-isotropic carbon/epoxy laminates under compressive loads (2020)
Journal Article

The size effects in centre-notched quasi-isotropic carbon/epoxy laminates under compression were investigated. The in-plane dimensions of the baseline specimen were scaled up by a factor of up to 14. The centre-notched specimens were compared to open... Read More about An experimental study of scaling effects in notched quasi-isotropic carbon/epoxy laminates under compressive loads.

Experimental investigation of high velocity oblique impact and residual tensile strength of carbon/epoxy laminates (2019)
Journal Article

Composite components are required to be resilient against Foreign Object Damage (FOD) induced by localised high velocity impact events. Here an experimental investigation into high velocity oblique impacts and residual tensile strength of thin quasi-... Read More about Experimental investigation of high velocity oblique impact and residual tensile strength of carbon/epoxy laminates.

Experimental determination of Through-Thickness Compression (TTC) enhancement factor for Mode II fracture energy (2018)
Journal Article

Mode II fracture energy, GIIC, is a critical parameter for determining the propagation of delamination in composite laminates. Its value can be affected by Through-Thickness Compression (TTC) stress acting on the crack tip and here this effect has be... Read More about Experimental determination of Through-Thickness Compression (TTC) enhancement factor for Mode II fracture energy.

Predicting notched tensile strength of full-scale composite structures from small coupons using fracture mechanics (2017)
Journal Article

The initial fracture propagation within a full-scale stiffened quasi-isotropic composite panel and coupons with stringer feet under tensile loads was investigated. The specimens were made from Non-Crimp Fabric through Vacuum assisted Resin Transfer M... Read More about Predicting notched tensile strength of full-scale composite structures from small coupons using fracture mechanics.

Unification of strength scaling between unidirectional, quasi-isotropic, and notched carbon/epoxy laminates (2016)
Journal Article

An investigation into size effects and notch sensitivity in quasi-isotropic carbon/epoxy laminates was carried out. The purpose is to draw a complete picture of the strength scaling in unidirectional, quasi-isotropic, and notched carbon/epoxy laminat... Read More about Unification of strength scaling between unidirectional, quasi-isotropic, and notched carbon/epoxy laminates.

An experimental investigation into size effects in quasi-isotropic carbon/epoxy laminates with sharp and blunt notches (2014)
Journal Article

An experimental investigation into size effects in notched [45/90/-45/0]4s carbon/epoxy laminates is carried out. The in-plane dimensions of the quasi-isotropic laminates are scaled up by a factor of up to 8. Larger Scale 16 specimens with only their... Read More about An experimental investigation into size effects in quasi-isotropic carbon/epoxy laminates with sharp and blunt notches.