Baozhong Sun

Baozhong Sun
  • Research Director at Donghua University

About

212
Publications
38,661
Reads
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6,948
Citations
Current institution
Donghua University
Current position
  • Research Director

Publications

Publications (212)
Article
Multi‐stimuli responsive shape memory composites (MS‐SMPCs) have broad potential in fields such as adaptive architecture and aerospace applications but face limitations in response speed, mechanical performance, and reliability. To address this, this study designs a two‐dimensional woven SMPC based on continuous carbon fiber (CCF)/Fe 3 O 4 nanopart...
Article
The variations in electrical resistance of carbon fiber composites under different damage modes are critical for the design of electrically conductive components. Here, we developed a fiber random contact model to analyze the changes in electrical resistance of carbon fiber composites subjected to various damage scenarios. An ideal rectangular grid...
Article
Full-text available
2D braided shape memory composite (SMPC) tubes, with near-net shape manufacturing and programmable, are widely utilized in smart structures. Here we have developed braided tubes of continuous carbon fiber reinforced shape memory polyurethane (SMPU) composites. This innovative design yields a synergistic boost in both mechanical strength, shape memo...
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Full-text available
The effect of thermo-oxidative aging on mechanical properties is important to designing carbon fiber-reinforced composites serviced in long-term atmospheric environments. Here, we report the progressive bending damage behaviors of carbon fiber/epoxy 3D angle-interlock woven composites (3DAWCs) after thermo-oxidative aging. Three-point bending tests...
Article
Defect effects of carbon fiber composites under dynamic impact conditions are important to mechanical behavior design in the aerospace field. Here we report the defect effect on the impact compressive behavior of 3D braided composites at high strain rates from 550/s to 1240/s. The defect effect on damage behavior was observed by high-speed photogra...
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3-D braided composites are a promising material for manufacturing tubular structures. However, a thorough understanding of their damage mechanisms under torsion is required to maximize their potential applications. The present work constructed a multiscale equivalent model, integrating mesoscopic and homogeneous structures to reveal torsional behav...
Article
The three-dimensional braided composite multi-way tube is one kind of high strength joint with a unique seamless braided microstructure. Here we report a new method to prepare the three-way integrated braided preform. Quasi-static axial compressive damages and strengths of the three-way braided composite tubes were tested for revealing the effects...
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In this work, the bending modal properties of three-dimensional (3D) braided composites were investigated with the experimental and numerical methods. Three braided angles were selected to study the braided angle effect on the modal behavior of 3D braided composites. According to the experimental parameters, a homogeneous model containing the inter...
Article
The mechanical behaviors of three-dimensional angle-interlock woven composites (3DAWCs) after thermo-oxidative aging under different strain rates are imperative to retain safety in high-temperature conditions. This work presents the thermo-oxidative aging effects on strain rate sensitivity and compression failure mechanism of 3DAWCs based on the di...
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3-D braided composite three-way circular tubes are integrated seamless connected tubes used for high strength connecting joints. We developed a novel braiding method of ‘yarn-added, yarn realigned’ to prepare three-way tubular preforms. Low-velocity impact compressions (LVIC) along axial direction were conducted to find effects of branch length and...
Article
This paper reports the effects of defect sizes at different locations on the compressive behaviors of 3D braided composites. A polytetrafluoroethylene (PTFE) particle was embedded into the composite to form a defect. Low-velocity impact compression tests, high-speed photographic observations and micro-computed tomography (micro-CT) analyses were pe...
Article
Revealing mechanical behaviors of three-dimensional five-directional (3D5d) braided composites at different strain rates is a key point to its durability design and structural optimization. Here we report compressive responses, surface deformations and failure behaviors of aged 3D5d braided composites under different strain rates with digital image...
Article
Electrical responses of three-dimensional braided composites under mechanical loads are important for the design of structural health monitoring in real time. Here we reported electrical properties and electrical-mechanical behaviors of three-dimensional braided composites with different braiding angles under three-point bending load, and investiga...
Article
Impact compression behaviors after thermo-oxidative ageing are key to design safety and durability of 3D angle-interlock woven composites (3DAWC). This paper experimentally and numerically presents the impact compression properties and damage morphology of composites before and after ageing, which reveals the effects of thermo-oxidative ageing on i...
Article
Electro-thermal damage mechanisms on direct current are important for the reliability design of carbon fiber reinforced composites in an electric environment. Here we studied the effect of direct current direction on the electro-thermal damage of carbon fiber/epoxy plain woven laminates. The current was applied on the composite along longitudinal/t...
Article
Ageing conditions and braided structures will affect dynamic damage and failure mechanisms of 3D braided composites. Here we report the influence of thermo-oxidative ageing on impact compression behaviors of 3D braided composite with and without axial yarns, i.e., four directional (3D4d) and five directional (3D5d) braided composites. We found a si...
Article
Crack distribution quantifications are key to predict residual strength of composite materials after impact. Here we report impact crack distribution quantifications of 3-D angle-interlock woven composites (3-DAWCs) which were observed with micro-computed tomography (micro-CT), and also characterized with finite element analyses (FEA). A fast and a...
Article
Electrothermally actuated and mechanical properties are important for multifunctional application of fabric-reinforced shape memory polymer composites (SMPCs). Here we presented a new method to prepare the fabric-reinforced shape memory polymer thermoplastic composite molded with plain composite fabric. The composite fabric was weaved with continuo...
Article
Degradations of torsional behavior is a key issue to the evaluation of the 3-D braided tubes in thermal-oxidizing environment for a long-term service. Here we report the effect of thermal oxygen ageing on torsional behaviors of 3-D carbon fiber/ epoxy resin braided composite tubes. The torsional behaviors of the 3-D braided tubes were quasi-statica...
Article
By developing a thermo-mechanical coupled model, we quantitatively analyzed the effect of thermo-oxidative ageing on the temperature, thermal strain and thermal stress histories of braided composites during high-speed impact. We also considered temperature dependence of elastic modulus during impact in this model. The proposed model was first appli...
Article
The effect of thermo-oxidative aging on mechanical properties is a key factor in designing composites structures. This paper aims to explore the effects of thermo-oxidative aging on the mechanical behavior, surface deformation and damage evolution of 3-D angle-interlock woven composites (3DAWC) under compression. A bilinear stress-strain curve with...
Article
Three-dimensional (3D) braided shape memory polymer composites (SMPCs), combining braided structure with stimuli-responsive shape memory polymers, have broad potential for intelligent material design. We fabricated the 3D braided SMPCs with different braiding angles (15°, 25°, 35°) using a pre-impregnation method. The dynamic thermomechanical behav...
Article
Electrical resistance under cyclic loading is important for designing intelligent structures of carbon-fiber reinforced composites. Here we report electrical resistance changes of 3D carbon fiber/epoxy woven composites under short beam shear loading along different orientations. The electric changes were measured in short beam shear tests combined...
Article
The electric conductivity and surface potential distributions of carbon fiber laminated panels with different ply orientations have been investigated. We found that the unidirectional (UD) lamina has higher conductivity along the carbon fiber direction than the perpendicular direction, and equipotential contours also show different gradients along...
Article
Temperature rise and distribution from Joule heat are important for multifunctional application of carbon fiber reinforced composite. Here we studied the electro-thermal coupling behavior of 3-D braided composite under direct current. The temperature from Joule heat reduced electric resistance and contact resistance in the composite. The reduction...
Article
The macroscopic mechanical behaviors generally correlate with nanomechanical properties, especially elastic modulus. This paper presents the thermo-oxidative ageing effects on nanoscale elastic modulus and impact failure mechanism of 3D braided composites at micro and macro levels using PeakForce Quantitative Nano-Mechanics (PF-QNM) and digital ima...
Article
This paper aims to investigate the effects of the impurity defects in different locations on the transverse compressive behaviors of three-dimensional (3D) braided carbon fiber/epoxy composites under low-velocity impact. The composites with defects in different locations were prepared by placing polytetrafluoroethylene particles at the bottom surfa...
Article
Fracture toughness behaviors of 3D angle-interlock woven composites were characterized with Mode I double cantilever beam test and finite element analysis (FEA). Load–displacement curves, strain energy release rates and fracture morphologies were obtained from tests and compared with FEA. We found that the 3D woven fabric structure increases strain...
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Full-text available
Composite materials are known for their high stiffness and strength at lower weight as compared to conventional structural materials. Recently, there has been a growing interest in finding the new ways to decrease delamination failure, which is a life limiting factor of laminated composites. This review paper emphasizes on the effects of different...
Article
A microstructure model based on fully thermo-mechanical coupling behavior of 3-D braided composites has been proposed for characterizing multiple transverse impact damage. The interfacial contact and cohesive debonding, as well as ductile and shear damage, incorporate with thermo-mechanical coupling constitutive equations have been employed in the...
Article
Thermal oxygen ageing behaviors of polymer matrix composites depend on resin and preform architecture. This paper concerns effects of braided architectures on thermo-oxidative ageing, including inner and surface crack initiations and propagations in 3D braided carbon fiber/epoxy composites. The ageing behaviors of unidirectional (UD) was also teste...
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Full-text available
Four-dimensional (4D) printing technology provides new ideas for the preparation and structural design of multifunctional shape memory composites. Excellent electrothermal shape memory behavior and high shape recovery force are urgently demanded in practical applications. Herein, a continuous carbon fiber reinforced polylactic acid shape memory com...
Article
Full-text available
This paper investigates the ballistic impact on Kevlar multilayer three-dimensional angle-interlock woven fabric (3DAWF) by proposing the mesoscale geometrical model for the numerical simulation. Multilayer 3DAWF is designed to yarn level configuration by utilizing the membrane elements to reduce computational time and enhance accuracy. The general...
Article
Carbon-based (e.g. carbon fibers or carbon nanotube (CNT)) polymer composite materials, due to the high specific strength, and good chemical stability features, is a promising structural material for energy-efficient applications in aerospace and civil infrastructures. However, the difficulty of viscosity-related infusing and curing of polymer limi...
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Full-text available
Flexible fabrics have been widely used in body armor designs. Here we report ballistic impact damage of stacked cross-plied composite fabric and cross-plied laminated panels. The ballistic impact behaviors of stacked cross-plied composite fabric and cross-plied laminated panel have been tested with fragment-simulating projectiles under the strike v...
Article
We proposed a thermo-mechanical coupled model to better understand the coupling effects of thermo-oxidative aging and braiding structure on the high-speed impact responses of 3D braided carbon fiber reinforced epoxy composite. The impact responses of the aged and unaged braided composites with different braiding structures were experimentally and n...
Article
Additive manufacturing (AM) of lightweight and energy-efficient composites using continuous carbon fibers and thermosetting polymers offers great opportunities for advancing composite manufacturing with design flexibility, reliability, and repeatability. However, to date there have been few AM techniques reported to process continuous fiber-reinfor...
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Full-text available
Axial electromechanical properties after transverse compression of carbon nanotube (CNT) fibers were studied for their potential application in constructing lightweight structures. The structure-property relationship under two different compression modes was revealed due to their unique mechanical and electrical properties. Change of disentanglemen...
Article
Wire-shaped supercapacitors (WSC) have attracted tremendous attention for powering portable electronic devices. However, previously reported WSC suffered from a complicated fabrication process and high cost. The objective of this study is to develop a facile and scalable process for the fabrication of high energy density WSC. We coupled the wet-spi...
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Full-text available
Temperature and strain rate dependent impact on tensile behaviors of three-dimensional (3D) carbon fiber/epoxy angle-interlock woven composites (AWC) were investigated in both along the warp and weft directions. Four strain rates and three temperature points were selected to explore their effects on the impact tensile properties of 3DAWC. It is fou...
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Full-text available
4D printing technology is known as the combination of 3D printing technology and stimulus‐responsive materials. 4D printed conductive filler/shape memory polymer composites have tremendous potential in the development of remotely and sequentially controlled smart devices. This work focuses on the temperature dependent volume resistivity, Joule‐heat...
Article
The four-dimensional (4D) printing technology enables the convergence of three-dimensional (3D) printing and shape memory polymer (SMP). The aim of this research is to demonstrate the synergistic effect between a spring steel strip (SSS) and a 4D printed thermoplastic SMP on enhancing the shape recovery properties. The recovery time of the SMP/SSS...
Article
Three-dimensional braided composite materials have been widely applied to engineering structure manufacturing. It is of a great importance to characterize the impact damage of the three-dimensional braided composite under various temperatures for optimizing the engineering structure. Here we conducted transverse impact deformation and damage of thr...
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Full-text available
This paper reports deformation and damage evolutions of three-dimensional (3-D) braided composite with different braiding angles under multiple impact compression along longitudinal direction. Braided composites with braiding angle of 15°, 26° and 37° have been prepared for the compression tests. The impact compression test was conducted on a split...
Article
This paper aims to investigate the thermal ageing effect on the impact and post-impact behaviors of 2.5-D woven composites. A combined experimental and numerical study is carried out over a range of impact energies with the subsequent residual flexural tests on both aged (in the air for 32 days at 180℃) and pristine samples. Low-velocity impact tes...
Article
Four-dimensional (4D) printing technology, combining 3D printing with stimuli-responsive materials, has attracted extensive attention for smart additive manufacturing. This work focuses on microstructural design, shape recovery behavior and recovery force characterization of 4D printed angle-ply laminated and rectangular braided preforms and their...
Article
Fracture toughness is a key factor to design impact behaviors of composite materials. This paper reports the influence of pre-crack length on Mode I fracture toughness of 3-D angle-interlock woven composites. Double cantilever beam specimens with different pre-crack lengths were tested to obtain load-displacement curves and strain energy release ra...
Article
This paper presents a multi-scale finite element model to calculate the stress field and analyze the punch shear failure of three-dimensional braided composite at high strain rates. The multi-scale model was established based on real braided structure taking the surface and corner braiding yarns into consideration. Constitutive material modeling an...
Article
Fracture behaviors of thermo-oxidative aged 3D braided composites are significantly affected by interfacial weakening and matrix degradation. Here we report the impact fracture behaviors of three-dimensional four direction (3D4d) and five directional (3D5d) braided composites under thermo-oxidative conditions. Specimens were exposed at hot air (180...
Article
Transverse impact damages of 3D angle-interlock woven composites have been tested at split Hopkinson pressure bar along warp and weft directions respectively. The impact deformation and damages were photographed with a high-speed camera. A finite element analyses model was established at mesostructure level to unveil the inner yarn, resin damages,...
Article
Low-velocity penetration damage behaviors of Kevlar woven fabrics impregnated with shear thickening fluid (STF) were investigated. Cone-shaped tup (CST) and hemispheric tup (HST) were employed to penetrate fabric/STF composites with the velocities of 1.5 m/s and 3.0 m/s under drop-weight tests. The fabric impregnated with 3:1 diluted volume ratio h...
Article
The understanding of dynamic damage and failure of thermo-oxidative aged 3D carbon fiber/epoxy braided composite is critical to its durability design. Here we aim at a fine description of damage and failure of aged composites under impact compression by means of experiment and finite element analysis (FEA). The composites and epoxy resins were aged...
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Full-text available
This paper reports dynamic mechanical behaviors of 3-D rectangular braided composite with different braiding angles under multi-pulse impact load. The composite materials were prepared with braided preforms which have braiding angles of 15 °, 26° and 37 °, respectively. Impact compression tests were conducted in split Hopkinson pressure bar. High-s...
Article
Fracture behaviors of three-dimensional braided composites could be designed from braided preform structures. Here, we compare the fracture behaviors of three-dimensional four direction (3D4d) and five directional (3D5d) braided composites under impact loading. A drop weight impact tester combined with a high-speed photography system was employed t...
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Full-text available
Flexible and stretchable physical sensors capable of both energy harvesting and self‐powered sensing are vital to the rapid advancements in wearable electronics. Even so, there exist few studies that can integrate energy harvesting and self‐powered sensing into a single electronic skin. Here, a stretchable and washable skin‐inspired triboelectric n...
Article
The unique structural features of three-dimensional (3D) braided preforms determine an array of excellent mechanical properties of 3D braided composites, such as high strength and low density, great damage tolerance and fatigue performance. In the present paper, the studies relevant to the structural modeling of 3D braided preforms in recent decade...
Article
In this study, the punch shear properties and damage mechanism of three-dimensional braided carbon/epoxy composites with different thicknesses are investigated both experimentally and numerically. Three kinds of specimen thickness are prepared: 3 mm, 5 mm, and 8 mm. A modified split Hopkinson pressure bar with a specially designed punch shear fixtu...
Article
Four-dimensionally (4D) printed origami structures have great potential for applications in actuators and reconfigurable devices by taking the advantages of 3D printing technology and shape memory polymers. This study focuses on the shape recovery progression of 4D printed laminated Miura-origami tessellations and tubes under compressive load-induc...
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Full-text available
The emergence of stretchable textile‐based mechanical energy harvester and self‐powered active sensor brings a new life for wearable functional electronics. However, single energy conversion mode and weak sensing capabilities have largely hindered their development. Here, in virtue of silver‐coated nylon yarn and silicone rubber elastomer, a highly...
Article
Full-text available
The compressive behaviors of three-dimensional braided composites with different cross sections and lengths along braided direction under high strain rates were reported from numerical simulations and experimental tests. The microstructure models with and without defects were established. The microstructure model with random distributed defects was...

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