Composite Structures最新文献

{"title":"Comparative analysis of modal, static, and buckling behaviors in thin-walled composite cylinders: A detailed study","authors":"Lucas Eiji de Castro Saiki,&nbsp;Guilherme Ferreira Gomes","doi":"10.1016/j.compstruct.2024.118672","DOIUrl":"10.1016/j.compstruct.2024.118672","url":null,"abstract":"<div><div>This investigation delves into the dynamics of buckling, modal, and static analyses within delaminated composite cylinders, integral to sectors such as aerospace, automotive, naval, and civil engineering. The escalating dependence on composite materials, attributed to their exceptional strength-to-weight ratio and adaptability in design, necessitates a deep dive into their failure modes, with a focus on delamination. Employing a systematic analytical framework, this study delineates the intricate impact of delamination on the structural integrity of composite cylinders, underscoring the synergy between buckling behavior, modal characteristics, and static performance. The methodology includes simulating a series of identical tubes, each with varying degrees of delamination, to perform a comparative analysis across three distinct tests. The procedural stages include specifying the parameters for cylinder construction and delamination, applying numerical modeling techniques for static, modal, and buckling analyses, and conducting a comprehensive correlation analysis of the outcomes. The results indicate that while fiber angles have a negligible impact on modal and buckling results, a 0°orientation significantly increases the likelihood of structural collapse in static analysis. Additionally, the correlation study among the analyses underscores the independence of results, necessitating thorough verifications in cylindrical structure development or maintenance validations. Notably, the position along the axis, the angle, and the aspect ratio of delamination are critical parameters influencing static outcomes. This research not only broadens our understanding of composite material behavior but also emphasizes the need for advanced analytical models to predict and mitigate failures, thus enhancing material design and the reliability of engineering systems.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118672"},"PeriodicalIF":6.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Crashworthiness assessment of a composite fuselage stanchion employing a strain rate dependent damage model","authors":"Mário Miranda ,&nbsp;Andrea Cini ,&nbsp;Antonio Raimondo ,&nbsp;Volnei Tita","doi":"10.1016/j.compstruct.2024.118674","DOIUrl":"10.1016/j.compstruct.2024.118674","url":null,"abstract":"<div><div>Numerical testing is crucial for the design of composite fuselages, which have strict crashworthiness regulations. However, the majority of studies on numerical fuselage impacts do not account for the effects of strain rate in simulations. A damage model considering strain rate dependence has been implemented to accurately predict the impact behaviour of a composite fuselage structure. This model enhances the existing three-dimensional Hashin criterion by incorporating strain rate effects and its implemented numerically using a VUMAT subroutine in ABAQUS/explicit. Validation of the model is done through a low-velocity impact problem, showing a better correlation with experimental data compared to previous numerical analyses available in the literature. The study focuses on high-energy impact on a composite stanchion in the lower lobe of an aircraft fuselage. Results demonstrate that the newly proposed model effectively predicts failure zones and modes, indicating its potential in addressing dynamic composite problems typical of impact scenarios.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118674"},"PeriodicalIF":6.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A mean field homogenization model for the mechanical response of ceramic matrix composites","authors":"Kevin Spilker ,&nbsp;Ricardo A. Lebensohn ,&nbsp;George Jacobsen ,&nbsp;Laurent Capolungo","doi":"10.1016/j.compstruct.2024.118630","DOIUrl":"10.1016/j.compstruct.2024.118630","url":null,"abstract":"<div><div>SiC/SiC composites offer exceptional mechanical stability at high temperatures and under irradiation. These ceramic matrix composites are therefore strong candidate materials for future nuclear energy applications. Their mechanical response, which exhibits pseudo-plasticity, is mediated by matrix cracking, fiber debonding, and fiber pull-out due to slip. This study introduces a mechanistic model for the behavior of unidirectionally reinforced SiC/SiC composites. Specifically a mean field homogenization approach is proposed to account for all deformation and degradation modes during mechanical deformation. The homogenization scheme relies on a Mori Tanaka method that is extended to consider the effects of the coating’s elasto-plastic response on the development of micromechanical fields. Further, the model proposed introduces a method to effectively account for the role of localized damage (i.e., cracks) on mechanical fields within both the fiber and the matrix. Upon validating the model against experimental data, the roles of interface sliding, coating dimensions and intrinsic elastic response, as well as of microstructure (e.g. porosity, fiber volume fraction) are discussed.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118630"},"PeriodicalIF":6.3,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermoelastic contact of layer-substrate system: Effects of force-like interface and Kapitza thermal resistance models","authors":"Yibin Jiang,&nbsp;Pengyang Zhao,&nbsp;Wenwang Wu","doi":"10.1016/j.compstruct.2024.118675","DOIUrl":"10.1016/j.compstruct.2024.118675","url":null,"abstract":"<div><div>Heterogenous materials composed of multiple layers with different material properties are commonly used for multi-functional engineering applications. Due to the existences of inevitable interfacial defects, discontinuities in displacement, stress, or thermal transmission often occur across the interfaces. This paper focus on the problem of layer-substrate system under three-dimensional sliding thermoelastic contact, and force-like imperfect interface and Kapitza thermal resistance interface defects are specially treated. By employing Fourier transforms, closed-form analytical expressions for the three-dimensional thermoelastic field of layer-substrate system with imperfect interface within Fourier spectral space are derived. The temperature and stress fields are computed using discrete convolution fast Fourier transform (DC-FFT) and the conjugate gradient method (CGM). Based on this model, the impact of defects on in-plane and out-of-plane stresses, von Mises stress, and the temperature field is investigated, and it is found that the force-like and Kapitza thermal resistance defects will result in discontinuities in stress and temperature field across the interface plane, and parametric analysis is performed for understanding the physical laws and key factors influencing the interface elastic fields discontinuities.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118675"},"PeriodicalIF":6.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification of component material in-situ properties of C/SiC composites based on self-consistent clustering analysis and Bayesian method","authors":"Bo Gao,&nbsp;Xinhang Dai,&nbsp;Hongyue Wang,&nbsp;Xinliang Zhao,&nbsp;Chenghai Xu,&nbsp;Qiang Yang,&nbsp;Songhe Meng","doi":"10.1016/j.compstruct.2024.118686","DOIUrl":"10.1016/j.compstruct.2024.118686","url":null,"abstract":"<div><div>In the paper, a method for identifying the mechanical properties of the in-situ component materials in carbon fiber reinforced silicon carbide ceramic matrix composites based on the macro mechanical test data is proposed. Firstly, the computation efficiency of considering damage behavior in the <em>meso</em>-mechanial model is improved through the self-consistent clustering analysis. Subsequently, sensitivity analysis is introduced in the parameter identification based on the Bayesian network to reduce the number of parameters to be identified simultaneously, thereby alleviating the ill-posedness of the inverse problem. Numerical and experimental cases were conducted to validate the proposed method. The maximum error of parameter identification is 6.0 % and the prediction error for strength is only 1.7 % in the numerical case with 5 % Gaussian noise. In the experimental case, the stress–strain curve calculated using the identified results shows good agreement with the experimental data. The prediction error for strength is only 2.2 %, while the maximum deviation between the identified results and the reference value in the literature can be up to 50 %, indicating the importance of obtaining the properties of component materials in-situ.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118686"},"PeriodicalIF":6.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mode I crack propagation in polydimethylsiloxane-short carbon fiber composites","authors":"Nan Hou ,&nbsp;Qiang Guo ,&nbsp;Fahmi Zaïri ,&nbsp;Ning Ding","doi":"10.1016/j.compstruct.2024.118682","DOIUrl":"10.1016/j.compstruct.2024.118682","url":null,"abstract":"<div><div>This paper presents a comprehensive analysis of reinforcement toughening and failure mechanisms in polydimethylsiloxane (PDMS)-carbon fiber (CF) composites employing an approach combining experiments and numerical simulations. Through a series of meticulously designed mechanical experiments, the behavior of the composite material under varying conditions is thoroughly examined. The introduction of CFs enhances the stiffness of the material while also leading to debonding and an increased Mullins effect. A constitutive model replicating the observed reinforcement and damage behavior is implemented. Our investigation extends to the analysis of crack growth through both numerical simulations and microscopic morphological examinations. A cohesive zone model is subsequently utilized to simulate crack propagation, providing enhanced understanding of the relationship between structural characteristics and mechanical behaviors. The process of crack propagation subjects the materials to cycles of loading and unloading, highlighted by the reinforcing action of CF pinning and stress transfer, alongside toughening mechanisms attributed to a variety of dissipative processes: interfacial debonding damage, energy loss due to CF pull-out, the Mullins effect, and viscous energy dissipation. This study elucidates the complex mechanical interplay within PDMS-CF composites and suggests pathways for their design optimization, significantly broadening their applicability in numerous domains.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118682"},"PeriodicalIF":6.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-velocity impact and quasi-static post-impact compression analysis of woven structural composites for automotive: Influence of fibre types and architectural structures","authors":"Sandeep Olhan ,&nbsp;Bindu Antil ,&nbsp;B.K. Behera","doi":"10.1016/j.compstruct.2024.118676","DOIUrl":"10.1016/j.compstruct.2024.118676","url":null,"abstract":"<div><div>This paper studied the effect of different fibres and their architectures on the low-velocity impact (LVI) and quasi-static compression after impact (CAI) characteristics of textile fibre-based structural composite materials (TFSCM) manufactured using the vacuum-assisted resin transfer molding (VARTM) method. All specimens were tested at three distinct impact energy levels: 20 J, 30 J, and 40 J. Subsequently, optical microscopy, field emission scanning electron microscope (FESEM), and 3D X-ray micro-computed tomography (µ-CT) techniques were utilized to examine and analyze the internal and external damage morphologies, failure mechanisms, and damage distribution within the structural composites. The experimental findings revealed that the basalt epoxy-based three-dimensional (3D) woven fabric-reinforced composites had superior energy absorption and deformation resistance than the glass and sisal-based unidirectional (UD) and bidirectional (2D) composites across all impact energy levels. Furthermore, µ-CT analysis showed that specimens impacted at 40 J experienced a 128.41 % and 154.36 % increase in damage volume compared to those impacted at 30 J and 20 J, leading to complete perforation damage and z-yarn bending and breakage without any delamination at the impact site. More importantly, composites reinforced with UD preforms impacted at 10 J exhibited higher CAI strength compared to both 2D and 3D composites.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118676"},"PeriodicalIF":6.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel three-dimensional DEM model for recycled aggregate concrete considering material heterogeneity and microcrack evolution","authors":"Haiyang Zhao ,&nbsp;Annan Zhou ,&nbsp;Liangchi Zhang ,&nbsp;Arul Arulrajah","doi":"10.1016/j.compstruct.2024.118677","DOIUrl":"10.1016/j.compstruct.2024.118677","url":null,"abstract":"<div><div>Recycled aggregate concrete presents significant potential for sustainable construction. However, its widespread adoption is impeded by a lack of comprehensive understanding of how recycled aggregates impact its mechanical properties. This paper proposes an advanced discrete element model accurately representing the concrete’s <em>meso</em>-structure, including diverse interfacial transition zones, random adhering mortar distributions as well as heterogeneous material properties. Furthermore, this model also allows for the identification and dynamic monitoring of microcrack initiation and propagation. Results show that low-quality recycled aggregates promote direct crack propagation through the aggregates, significantly impairing concrete performance. Adhering mortar negatively impacts concrete properties due to its poor interfacial bond with the mortar matrix and its inferior mechanical properties. The influence of the replacement ratio on the concrete properties is closely tied to the recycled aggregate quality. High-quality aggregates allow for higher replacement ratios with limited property degradation in the concrete.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118677"},"PeriodicalIF":6.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fracture properties of carbon/glass fiber composite laminates with surface scratch damage","authors":"Pingping Luo ,&nbsp;Wei Shen ,&nbsp;Lifeng Chen ,&nbsp;Zijia Yao ,&nbsp;Qian Li ,&nbsp;Lvtao Zhu","doi":"10.1016/j.compstruct.2024.118673","DOIUrl":"10.1016/j.compstruct.2024.118673","url":null,"abstract":"<div><div>Carbon/glass fiber reinforced polymer composite panels may experience minor surface scratches during processing or use. These shallow scratches can expand and potentially lead to dangerous fracture failure as the specimens are continually loaded. This study presents a closed form non-LEFM model for predicting the fracture performance of materials with slight scratches. First, 3-p-b tests and direct tensile tests were conducted on 115 carbon/glass fiber composite laminated panel specimens. A comparison of the two test methods revealed that 3-p-b tests were more suitable for analyzing quasi-brittle fracture in carbon/glass fiber composites. The tensile strength <span><math><msub><mrow><mi>f</mi></mrow><mrow><mi>t</mi></mrow></msub></math></span> and fracture toughness <span><math><msub><mrow><mi>K</mi></mrow><mrow><mrow><mi>I</mi></mrow><mrow><mi>C</mi></mrow></mrow></msub></math></span> of 3-p-b specimens with and without notched were discussed using the weighted average calculation method to determine the thickness of the “composite” single-layer prepreg as the characteristic composite unit <span><math><msub><mrow><mi>C</mi></mrow><mrow><mrow><mi>c</mi></mrow><mrow><mi>h</mi></mrow></mrow></msub></math></span>. A normal distribution method was also introduced to analyze the experimental discrete points, covering almost all the experimental scatterers with desired reliability. Furthermore, the same method was applied to specimens with different layup methods, and the data analysis confirmed its effectiveness. As the seam-thickness ratio <em>α</em> increases within a certain range, the tensile strength <span><math><msub><mrow><mi>f</mi></mrow><mrow><mi>t</mi></mrow></msub></math></span> showed an overall increasing trend and the peak load <span><math><msub><mrow><mi>P</mi></mrow><mrow><mrow><mi>m</mi></mrow><mrow><mi>a</mi></mrow><mrow><mi>x</mi></mrow></mrow></msub></math></span> showed a decreasing trend. Additionally, the laboratory routine dimensions can be utilized to efficiently predict the fracture of large size members with defects at the same thickness, which is significant for the safe design of composite structures.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118673"},"PeriodicalIF":6.3,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional elasticity solutions for doubly-curved composite shells by extended differential quadrature method","authors":"G.M. Kulikov","doi":"10.1016/j.compstruct.2024.118647","DOIUrl":"10.1016/j.compstruct.2024.118647","url":null,"abstract":"<div><div>This paper presents the three-dimensional (3D) stress analysis of doubly-curved composite shells with general boundary conditions using the strong sampling surfaces (SaS) formulation. The SaS method is based on the choice of SaS parallel to the middle surface and located at Chebyshev polynomial nodes to introduce the displacements of these surfaces as unknown functions that leads to a non-conventional shell formulation, in which strain–displacement and stress–strain relationships are represented in terms of SaS displacements. This is due to the use of Lagrange polynomials in approximating displacements, strains and stresses in the thickness direction. The outer surfaces are not included into a set of SaS that makes it possible to uniformly minimize the error used by Lagrange interpolation. The strong SaS formulation, based on direct integration of elasticity equilibrium equations in the thickness direction by the extended differential quadrature (EDQ) method, can be applied efficiently for high-precision calculations of doubly-curved composite shells with clamped and free edges. This is because in the SaS/EDQ formulation, displacements, strains and stresses of SaS are interpolated in a rectangular domain specified in a curvilinear coordinate system using a Chebyshev-Gauss-Lobatto grid and Lagrange polynomials are also used as basis functions. The proposed approach deals with equilibrium equations in terms of SaS stresses, avoiding the integration of second order differential equations in terms of SaS displacements, that greatly simplifies the implementation of the EDQ method.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118647"},"PeriodicalIF":6.3,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}