A theoretical and experimental assessment of 3D macroscopic failure criteria for predicting pure inter-fiber fracture of transversely isotropic UD composites

Gu, Jiefei; Chen, Puhui; Su, Lei; Li, Ké

doi:10.1016/j.compstruct.2020.113466

Cited by 19 publications

(8 citation statements)

References 31 publications

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“…The challenges with 3-D printed materials arise from the lack of consistency, and 3-D printed materials can differ from model to model due to variables such as printing direction and fill density. For instance, in Gu et al's publication on composite structures, there is an increased risk due to the complexity from high anisotropy and a variety of failure modes [52]. For simplicity, the Von Mises failure criterion is commonly used on 3-D printed materials, however, it assumes the material to be isotropic [52].…”

Section: Finite Element Analysis Studiesmentioning

confidence: 99%

“…For instance, in Gu et al's publication on composite structures, there is an increased risk due to the complexity from high anisotropy and a variety of failure modes [52]. For simplicity, the Von Mises failure criterion is commonly used on 3-D printed materials, however, it assumes the material to be isotropic [52]. In this study, the Tsai-Wu failure criterion was more suitable since 3-D printed and composite materials are inherently anisotropic, and Tsai-Wu is a generally acceptable failure criterion for anisotropic materials.…”

Section: Finite Element Analysis Studiesmentioning

confidence: 99%

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Exploring the Performance Boundaries of a Small Reconfigurable Multi-Mission UAV through Multidisciplinary Analysis

Santos,

Rogers,

De Rezende

et al. 2023

Aerospace

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The performance of a small reconfigurable unmanned aerial vehicle (UAV) is evaluated, combining a multidisciplinary approach in the computational analysis of additive manufactured structures, fluid dynamics, and experiments. Reconfigurable UAVs promise cost savings and efficiency, without sacrificing performance, while demonstrating versatility to fulfill different mission profiles. The use of computational fluid dynamics (CFD) in UAV design produces higher accuracy aerodynamic data, which is particularly important for complex aircraft concepts such as blended wing bodies. To address challenges relating to anisotropic materials, the Tsai–Wu failure criterion is applied to the structural analysis, using CFD solutions as load inputs. Aerodynamic performance results show the low-speed variant attains an endurance of 1 h, 48 min, whereas its high-speed counterpart is 29 min at a 66.7% higher cruise speed. Each variant serves different aspects of small UAS deployment, with low speed envisioned for high-endurance surveying, and high speed for long-range or time-critical missions such as delivery. The experimental and simulation results suggest room for design iteration, in wing area and geometry adjustments. Structural simulations demonstrated the need for airframe improvements to the low-speed configuration. This paper highlights the potential of reconfigurable UAVs to be useful across multiple industries, advocating for further research and design improvements.

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Section: Finite Element Analysis Studiesmentioning

confidence: 99%

Section: Finite Element Analysis Studiesmentioning

confidence: 99%

Exploring the Performance Boundaries of a Small Reconfigurable Multi-Mission UAV through Multidisciplinary Analysis

Santos,

Rogers,

De Rezende

et al. 2023

Aerospace

View full text Add to dashboard Cite

show abstract

“…These directional properties were assigned to the RVE cube homogeneously representing the pure composite section, which are also based on experimental tests (Table 1, Figure 5A,C). The Tsai-Hill failure criterion with some modifications made by Hoffman given by Equation ( 7) [60] was considered for pinpointing the onset of composite's elements failure during quasi-static tensile test simulation.…”

Section: Fe Analysismentioning

confidence: 99%

“…Parameters X T , X C , Y T , Y C , S 12 , and S 23 show ultimate tensile and compression strength along fiber direction, tensile and compression strength in the direction being perpendicular to the fibers, xy and yz local shears, respectively. Moreover, for LVI simulation the 3D Hashin failure criterion (Equations 8 and 9) [60] ) was chosen to designate matrix failure mode since during this test composite's matrix is more likely to be damaged. [61] For the healing process, it is assumed that if the composite's degraded elements were in the distance of 78 μm (the maximum distance that a microcapsule with a 600 μm diameter is able to heal) from the ruptured microcapsules, their mechanical properties would be switched to FV-3, meaning that their properties being perpendicular to the fibers' direction would be recovered.…”

Section: Fe Analysismentioning

confidence: 99%

Experimental and multi‐scale finite element modeling for evaluating healing efficiency of electro‐sprayed microcapsule based glass fiber‐reinforced polymer composites

et al. 2022

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Microcapsule based glass fiber‐reinforced polymer (GFRP) composites have attracted enormous attention due to enhancement of structures' longevity, reducing expenses, and simplicity of fabrication process. In this study, a micromechanical model of a woven E‐glass/epoxy composite containing microcapsules was developed based on finite element analysis (FEA). Modified sequential adsorption algorithm was chosen to generate and disperse microcapsules in three types of representative volume elements (RVEs). Also, mechanical properties of microcapsules and composite were assigned based on nanoindentation tests and standard experimental tests, respectively. Eventually, multi‐scaling method was implemented to homogenize maximum tensile stress, and subsequent evaluation of tensile after impact (TAI) healing efficiency. Therefore, a healing efficiency of 71% was obtained based on three types of simulations encompassing low‐velocity impact (LVI) and quasi‐static tensile tests on the RVEs. In order to validate the results; first, an electrospraying set‐up was exploited to fabricate multicore microcapsules. The fabricated microcapsules contained mercaptan hardener and epoxy resin as the healing agents, and they were covered by alginate shell. Second, incorporated composite specimens with microcapsules were fabricated via the hand‐layup method. The average TAI healing efficiency of 67% was achieved by experimental tests. Furthermore, scanning electron microscope images of the fractured surfaces confirmed rupture of microcapsules in the LVI test.

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“…[35][36][37][38] The buckling model [39,40] of composite laminates is established theoretically, which is beneficial to the structural design of beams. The bearing capacity verification forms of C-beam include four-point bending, [41] shearing and coupled loading. However, the mentioned loading methods may only be the single load (single bending or single shear), or the nonadjustable coupling ratio (three-point bending).…”

mentioning

confidence: 99%

Postbuckling behavior and failure prediction of large‐size composite C‐beam under bending‐shear coupling load

et al. 2023

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In this article, a novel experimental device that combines bending and shearing was proposed to investigate the load‐bearing performance of large‐size C‐beam structures against bending‐shear buckling, allowing for the adjustment of bending‐shearing ratio. Three different bending‐shear coupling conditions were performed for test loading, and the strain gauges were carried out to detect the strain distribution for postbuckling performance of the large‐size C‐beam. The finite element models were established by ABAQUS/Explicit to explore the stress distribution and damage evolution during postbuckling failure. Thereafter, the LaRC05 and Hashin criterion was used for failure prediction of the large‐size C‐beam in numerical simulations. The experiment results show that the large‐size C‐beam has excellent postbuckling bearing capacity regardless of bending or shear resistance. Based on the results, the failure numerical model considering the stress distribution in postbuckling and the finite element calculation were in good agreement with experiments. This study can offer a practical reference for the postbuckling performance of large‐size C‐beam structures after bending‐shear coupling.

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A theoretical and experimental assessment of 3D macroscopic failure criteria for predicting pure inter-fiber fracture of transversely isotropic UD composites

Cited by 19 publications

References 31 publications

Exploring the Performance Boundaries of a Small Reconfigurable Multi-Mission UAV through Multidisciplinary Analysis

Exploring the Performance Boundaries of a Small Reconfigurable Multi-Mission UAV through Multidisciplinary Analysis

Experimental and multi‐scale finite element modeling for evaluating healing efficiency of electro‐sprayed microcapsule based glass fiber‐reinforced polymer composites

Postbuckling behavior and failure prediction of large‐size composite C‐beam under bending‐shear coupling load

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