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学者姓名：王冰
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Abstract ：
Thermal residual stress generated during curing is known to be detrimental to mechanical performance of a carbon composite. Fiber prestressing technique has been developed for decades to counterbalance these negative effects. Although there have been some achievements in development of the prestress mechanisms, these are mainly based on the extrapolations from macroscopic mechanical characterizations, lack of direct evaluation of the in-situ in-plane strain or stress evolution mechanisms, in order to reveal the impact induced by different prestressing methods. Here, we investigated the in-situ strain evolution mechanisms in producing a prestressed carbon composite. Since clamping of the uncured prepreg is the most challenging, both the strain evolutions with and without precured prepreg edges were evaluated to reveal the underlying mechanisms induced by stress relaxation during fiber prestressing. Mechanical tests in terms of Charpy impact and three-point bending, as well as fractured morphology were carried out to evaluate the prestress effects. The underlying mechanisms were then proposed to reveal the fundamentals in producing a prestressed composite. These are expected to revolutionize industrial production and applications of prestressed polymeric composites, indicating detrimental mechanisms on precuring strip ends following conventional prestress procedures. Highlights There is an optimal prestrain level to maximize properties of a composite. Internal strain development is dependent on the fiber clamping methods. Stress relaxation is beneficial to induce compressive stress within a composite. In-situ strain evolution mechanics is revealed for prestressed carbon composite.
Keyword ：
curing curing polymeric composite polymeric composite prestress prestress residual/internal stress residual/internal stress strain strain
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| GB/T 7714 | Zhao, Chenmin , Wang, Bing , Lin, Xinyu et al. In-situ strain evolution mechanisms within a prestressed carbon composite [J]. | POLYMER COMPOSITES , 2024 , 45 (12) : 10826-10838 . |
| MLA | Zhao, Chenmin et al. "In-situ strain evolution mechanisms within a prestressed carbon composite" . | POLYMER COMPOSITES 45 . 12 (2024) : 10826-10838 . |
| APA | Zhao, Chenmin , Wang, Bing , Lin, Xinyu , Yu, Folian , Guan, Chenglong , Zhong, Shuncong . In-situ strain evolution mechanisms within a prestressed carbon composite . | POLYMER COMPOSITES , 2024 , 45 (12) , 10826-10838 . |
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A composite tape-spring (CTS) structure is a thin-walled open slit tube with fibres oriented at +/- 45, which is stable in both extended and coiled configurations. The governing factors of its bistability include composite constitutive behaviour, initial geometrical proportions, and geometrically non-linear structural behaviour. Its bistable principle can be employed to produce a flexible multistable hinge structure with tailorable stability. This is achieved by introducing variable stiffness design within a cylindrical shell structure, where folding stability is dependent on central functional patch region, and then connected to linking ploy regions. Thus, a novel multistable composite hinge structure can be designed with positive Gaussian curvature deformation, and its multistability is highly tailorable: a lengthy one-dimensional mechanical arm can be designed to coil and fold multiple times to enable large folding ratio. An analytical model was established based on the strain energy principle, in order to determine effects from functional tape length; the typical structural stability and stable configurations were then predicted with respect to regional length of the functional layer. It is found that the stability of a multistable composite hinge structure is dependent on geometry and combination of both the functional patch region, and connecting ploy region; the stable criteria are then proposed and show good agreement with experimental observations and FE analysis. These enrich the diversities of functional deployable structures to benefit novel requirements for various deployable mechanisms, and enable customised design, as well as smart driving for flexible and multifunctional mechanical composite hinge applications.
Keyword ：
Composite Composite Hinge Hinge Mechanics Mechanics Multistable Multistable
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| GB/T 7714 | Zhao, Chenmin , Lin, Xinyu , Wang, Bing et al. A multistable composite hinge structure [J]. | THIN-WALLED STRUCTURES , 2024 , 198 . |
| MLA | Zhao, Chenmin et al. "A multistable composite hinge structure" . | THIN-WALLED STRUCTURES 198 (2024) . |
| APA | Zhao, Chenmin , Lin, Xinyu , Wang, Bing , Zhu, Juncheng , Guan, Chenglong , Zhong, Shuncong . A multistable composite hinge structure . | THIN-WALLED STRUCTURES , 2024 , 198 . |
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Bistable composite structures have attracted growing interest in morphing applications to aerospace industry. Here, we device a novel prestrained bistable composite gridded structure, consisting pairs of prestrained composite strips on both sides and oriented in 90°. This is achieved by employing the elastic fibre prestressing (EFP) technique, where a plain-weave carbon prepreg was stretched in two directions at a constant strain level, and the tensile strain was maintained throughout the curing process to produce a prestrained composite trip. Upon load removal, recovery from the prestrained carbon fibres generates compressive stresses and interacts with thermal residual stresses, which in turn changing the in-plane stress level within a composite structure and induce out-of-plane deflections. Therefore, the bistability is generated from the pairs of the oriented prestrained composite strips, their deflections give opposite cylindrical configurations to the mid-plane. Here, we presented further details on the biaxial fibre straining rig; samples were produced with different prestrain levels, in order to reveal the underlying mechanisms from the fibre prestraining. These results provide valuable insights for the design of aerospace deployable structures. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
Keyword ：
Bistable Bistable Composite Composite Gridded structure Gridded structure Prestrain Prestrain
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| GB/T 7714 | Zhao, C. , Wang, B. , Chen, X. et al. A Prestrained Bistable Composite Gridded Structure [未知]. |
| MLA | Zhao, C. et al. "A Prestrained Bistable Composite Gridded Structure" [未知]. |
| APA | Zhao, C. , Wang, B. , Chen, X. , Lin, X. , Guan, C. , Zhong, S. . A Prestrained Bistable Composite Gridded Structure [未知]. |
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Space deployable structures are able to be deployed from a folded state to a predetermined or desired configuration. They are superior in terms of spatial packaging ratio, controllability, and structural complexity, in order to solve the space limitations for aerospace vehicles. Therefore, they have been applied in structural designs and concepts for various aerospace missions, including space support booms, space deployable antennas, solar panels, as well as flexible solar sails. Recent development of advanced manufacturing technologies and applications of novel smart materials and structures, brings new degree of design freedom to space deployable mechanics, inspiring novel space deployable mechanisms, especially for smart driving and control strategies. Here, we present a review on development of mechanics and smart driving of space deployable structures. Advantages and limitations for various deployable mechanisms are also presented to reveal further insights. The trends and future deployable mechanics are directed by further advancements in terms of modularisation, intelligences, and deployment precision. Multi-disciplinary cross-integrations are leading the way for future breakthroughs in novel deployable mechanics and intelligent driving control for space explorations.
Keyword ：
Deployable Deployable Driving Driving Mechanics Mechanics Smart Smart Structure Structure
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| GB/T 7714 | Wang, Bing , Zhu, Juncheng , Zhong, Shuncong et al. Space deployable mechanics: A review of structures and smart driving [J]. | MATERIALS & DESIGN , 2024 , 237 . |
| MLA | Wang, Bing et al. "Space deployable mechanics: A review of structures and smart driving" . | MATERIALS & DESIGN 237 (2024) . |
| APA | Wang, Bing , Zhu, Juncheng , Zhong, Shuncong , Liang, Wei , Guan, Chenglong . Space deployable mechanics: A review of structures and smart driving . | MATERIALS & DESIGN , 2024 , 237 . |
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Polymers and composites have been widely applied in many industries, especially in aerospace. There are growing demands for understanding their natural viscoelastic performance, especially in aerospace applications, where precise dimensional control and prediction of the residual strength and modulus are vital for the success of an aerospace vehicle. The existing superposition principles mainly focus on the well-known WLF-based horizontal shift to predict the long-term behaviour through short-term experimental tests in terms of creep or stress relaxation. Whilst the intrinsic microstructural changes or damages within a polymeric material due to viscoelastic deformation are not considered, which may lead to large differences for long-term predictions. Here, we look into the very fundamentals of the existing superposition principles, aiming to develop towards a unified theory to better predict the long-term relaxation modulus or creep of a polymeric solid. This is achieved by considering both the free volume theory-based horizontal shift factors and activation energy-based shift factors; microstructural changes or damages induced vertical shift factors are then coupled to improve the prediction accuracy of the superposition methods. These will facilitate long-term predictions and accelerated aging tests for viscoelastic solids. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.
Keyword ：
Accelerated Aging Accelerated Aging Arrhenius Arrhenius Shift Factor Shift Factor Superposition Principle Superposition Principle WLF Equation WLF Equation
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| GB/T 7714 | Chen, X. , Wang, B. , Zhao, C. et al. Towards a Unified Theory on the Superposition Principles [未知]. |
| MLA | Chen, X. et al. "Towards a Unified Theory on the Superposition Principles" [未知]. |
| APA | Chen, X. , Wang, B. , Zhao, C. , Du, D. , Guan, C. , Zhong, S. . Towards a Unified Theory on the Superposition Principles [未知]. |
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A bistable composite tape-spring (CTS) is a thin-walled open slit tube, which can be coiled or folded into two stable configurations. The CTS has been applied to roll-out-solar-array and successfully launched to space station and micro-satellites based on their one-time deployment performance. There is growing interest on CTS to be applied in reversible deployable structures and foldable mechanical hinges; however, its high-cycle fatigue under large shape folding is still unknown. Here, we device a novel folding fatigue setup to investigate the foldingunfolding cyclic behaviour of the CTS. This is achieved by using a bespoke folding fatigue rig, where both the tape ends of the CTS were clamped separately on rotatable shafts to enable folding under cyclic axial displacements. Since stress concentration is more significant in the snapping fold region, analysis is focused on the peak fatigue stress. It is found that the folding peak stress decreases with the folding cycle: although progressive local damage is observed during 3000 to 100,000 cycles, the CTS is still functional and tends to be stablised after 300,000 folding cycles. The Basquin's law is applied to predict the fatigue life of the CTS, indicating a fatigue life of 1.4E11 folding cycles with a 40% decrease in peak folding stress. These findings are expected to facilitate the structural designs and applications of the CTS to flexible composite hinges.
Keyword ：
Bistable Bistable Composite Composite Folding fatigue Folding fatigue Functional Functional Structural Structural
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| GB/T 7714 | Chen, Xiayu , Du, Dongmei , Wang, Bing et al. High-cycle folding fatigue mechanics of a bistable composite tape-spring [J]. | MATERIALS LETTERS , 2024 , 368 . |
| MLA | Chen, Xiayu et al. "High-cycle folding fatigue mechanics of a bistable composite tape-spring" . | MATERIALS LETTERS 368 (2024) . |
| APA | Chen, Xiayu , Du, Dongmei , Wang, Bing , Jiang, Shihan , Guan, Chenglong , Zhong, Shuncong . High-cycle folding fatigue mechanics of a bistable composite tape-spring . | MATERIALS LETTERS , 2024 , 368 . |
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Abstract ：
A bistable composite tape-spring (CTS) structure is stable in both extended and coiled configurations, which can be fully coiled or folded. Its bistable coiling feature has been employed in a Roll-Out Solar Array and successfully deployed in space; its foldable characteristics is analogous to a flexible mechanical hinge, showing great potential to be applied in an aircraft landing gear. Both the structural coiling and folding mechanics are dependent on tape geometry; whilst the correlated scale effect has not been investigated, which significantly constrains its foldable mechanical hinge designs and smart driving analysis in order to further reduce weight and complexity for conventional mechanical hinges. Here, we studied the folding stability mechanics of the CTS structure towards its full tape-length range, where novel stress and shape transitional mechanisms are revealed. This is achieved by investigating the quasi-static folding process of the CTS, where new stable shape features in terms of critical transitional length and stable folded angle are observed and identified through experimental observations, finite element model, as well as theoretical analysis. Theoretical criteria were then determined from the strain energy analysis in comparison to the predefined folded tape shape features. The folding stability mechanisms towards its full tape-length range were proposed in order to facilitate customized flexible hinge design and in-situ smart driving analysis in order to replace conventional mechanical hinges.
Keyword ：
Composite Composite Folding Folding Mechanism Mechanism Stability Stability Tape-spring Tape-spring
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| GB/T 7714 | Chen, Hui , Wang, Bing , Lin, Xueqi et al. Folding mechanics of a bistable composite tape-spring for flexible mechanical hinge [J]. | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2024 , 272 . |
| MLA | Chen, Hui et al. "Folding mechanics of a bistable composite tape-spring for flexible mechanical hinge" . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 272 (2024) . |
| APA | Chen, Hui , Wang, Bing , Lin, Xueqi , Seffen, Keith A. , Zhong, Shuncong . Folding mechanics of a bistable composite tape-spring for flexible mechanical hinge . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2024 , 272 . |
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The use of terahertz time-domain spectroscopy (THz-TDS) for the nondestructive testing and evaluation (NDT&E) of materials and structural systems has attracted significant attention over the past two decades due to its superior spatial resolution and capabilities of detecting and characterizing defects and structural damage in non-conducting materials. In this study, the THz-TDS system is used to detect, localize and evaluate hidden multi-delamination defects (i.e., a three-level multi-delamination system) in multilayered GFRP composite laminates. To obtain accurate results, a wavelet shrinkage de-noising algorithm is used to remove the noise from the measured time-of-flight (TOF) signals. The thickness and location of each delamination defect in the z-direction (i.e., through-the-thickness direction) are calculated from the de-noised TOF signals considering the interaction between the pulsed THz waves and the different interfaces in the GFRP composite laminates. A comparison between the actual and the measured thickness values of the delamination defects before and after the wavelet shrinkage denoising process indicates that the latter provides better results with less than 3.712% relative error, while the relative error of the non-de-noised signals reaches 16.388%. Also, the power and absorbance levels of the THz waves at every interface with different refractive indices in the GFRP composite laminates are evaluated based on analytical and experimental approaches. The present study provides an adequate theoretical analysis that could help NDT&E specialists to estimate the maximum thickness of GFRP composite materials and/or structures with different interfaces that can be evaluated by the THz-TDS. Also, the accuracy of the obtained results highlights the capabilities of the THz-TDS for the NDT&E of multilayered GFRP composite laminates.
Keyword ：
Delamination defects Delamination defects Glass-fiber-reinforced polymer-matrix (GFRP) composites Glass-fiber-reinforced polymer-matrix (GFRP) composites Nondestructive testing and evaluation (NDT&E) Nondestructive testing and evaluation (NDT&E) Stationary wavelet transform (SWT) Stationary wavelet transform (SWT) Terahertz time-domain spectroscopy (THz-TDS) Terahertz time-domain spectroscopy (THz-TDS) Thickness evaluation Thickness evaluation
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| GB/T 7714 | Nsengiyumva, Walter , Zhong, Shuncong , Luo, Manting et al. Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites [J]. | CHINESE JOURNAL OF MECHANICAL ENGINEERING , 2023 , 36 (1) . |
| MLA | Nsengiyumva, Walter et al. "Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites" . | CHINESE JOURNAL OF MECHANICAL ENGINEERING 36 . 1 (2023) . |
| APA | Nsengiyumva, Walter , Zhong, Shuncong , Luo, Manting , Wang, Bing . Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites . | CHINESE JOURNAL OF MECHANICAL ENGINEERING , 2023 , 36 (1) . |
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Viscoelastic fibre prestressing (VFP) is a promising technique to counterbalance the potential thermal residual stress within a polymeric composite, offering superior mechanical benefits for structural engineering applications. It has been demonstrated that the time required for a desirable creep strain can be significantly reduced by implementing higher creep stress, while its long-term stability is still unknown. Here, we developed the prestress equivalence principle and investigated the durability of viscoelastic fibre prestressing within a composite in order to further enrich the prestress mechanisms. The effectiveness of the prestress equivalence principle was refined through Charpy impact testing of prestressed samples with various pre-strain levels. The durability was investigated by subjecting samples to both natural aging (up to 0.5 years) and accelerated aging (by using the time-temperature superposition principle). It is found that the prestress equivalence principle offers flexibility for viscoelastically prestressed polymeric matrix composite (VPPMC) technology; the impact benefits offered by VFP are still active after being accelerated aged to an equivalent of 20,000 years at 20 degrees C, inferring long-term reliability of VFP-generated fibre recovery within a polymeric composite. These findings demonstrated that both materials and energy consumption could be conserved for advanced composites. Therefore, they promote further steps of VPPMC technology toward potential industrial applications, especially for impact protection.
Keyword ：
durability durability impact impact polymeric composite polymeric composite prestress prestress viscoelasticity viscoelasticity
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| GB/T 7714 | Lin, Xueqi , Wang, Bing , Zhao, Chenmin et al. Durability of Viscoelastic Fibre Prestressing in a Polymeric Composite [J]. | POLYMERS , 2023 , 15 (4) . |
| MLA | Lin, Xueqi et al. "Durability of Viscoelastic Fibre Prestressing in a Polymeric Composite" . | POLYMERS 15 . 4 (2023) . |
| APA | Lin, Xueqi , Wang, Bing , Zhao, Chenmin , Nsengiyumva, Walter , Zhong, Shuncong , Chen, Hui et al. Durability of Viscoelastic Fibre Prestressing in a Polymeric Composite . | POLYMERS , 2023 , 15 (4) . |
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The elastic fibre prestressing (EFP) technique has been developed to balance the thermal residual stress generated during curing of a polymeric composite. The continuous fibre reinforcements are prestressed and then impregnated into a polymeric matrix, where the prestress load is only removed after the resin is fully cured in order to produce an elastically prestressed polymeric matrix composite (EPPMC). Although the EFP is active in improving the static mechanical performance of a composite, its mechanics on dynamic mechanical performance and viscoelasticity of a composite is still limited. Here, we established a theoretical model in order to decouple the EFP principle, aiming to better analyse the underlying mechanics. A bespoke fibre prestressing rig was then developed to apply tension on a unidirectional carbon-fibre-reinforced epoxy prepreg to produce EPPMC samples with various EFP levels. The effects of EFP were then investigated by carrying out both static and dynamic mechanical testing, as well as the viscoelastic creep performance. It was found that there is an optimal level of EFP in order to maximise the prestress benefits, whilst the EFP is detrimental to the fibre/matrix interface. The EFP mechanisms are then proposed based on these observations to reveal the in-plane stress evolutions within a polymeric composite.
Keyword ：
carbon-fibre-reinforced polymeric composite carbon-fibre-reinforced polymeric composite elasticity and viscoelasticity elasticity and viscoelasticity fibre fibre in-plane stress in-plane stress matrix interface matrix interface mechanics mechanics prestress prestress
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| GB/T 7714 | Chen, Hui , Yu, Folian , Wang, Bing et al. Elastic Fibre Prestressing Mechanics within a Polymeric Matrix Composite [J]. | POLYMERS , 2023 , 15 (2) . |
| MLA | Chen, Hui et al. "Elastic Fibre Prestressing Mechanics within a Polymeric Matrix Composite" . | POLYMERS 15 . 2 (2023) . |
| APA | Chen, Hui , Yu, Folian , Wang, Bing , Zhao, Chenmin , Chen, Xiayu , Nsengiyumva, Walter et al. Elastic Fibre Prestressing Mechanics within a Polymeric Matrix Composite . | POLYMERS , 2023 , 15 (2) . |
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