Micro-mechanical modeling study of the influence of cure process on the interfacial cracking of Z-pinned laminates

Zhang, Shengnan; Xu, Yingjie; Zhang, Weihong; Hui, Xinyu

doi:10.1016/j.compstruct.2021.114889

Cited by 12 publications

(2 citation statements)

References 44 publications

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“…The reason for this is that the graphite size around the square cylinder obtained from the composite material casting process is small, similar in length, and evenly distributed, resulting in an increase in the tensile strength of the thick wall and a small difference in the overall strength of the casting. In addition, there are some differences between the tensile strength test results of typical components and the strength values of finite element numerical simulation results, but it has no substantial impact on the test results [17,19,2,13,7]. This is because the performance parameters of the HT250 material used for pouring after inoculation treatment…”

Section: Mechanical Property Testing Of Square Cylindersmentioning

confidence: 99%

Numerical Simulation and Optimal Control of Composite Nonlinear Mechanical Parts Casting Process

Li,

Wang

2024

SCPE

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In order to understand the numerical simulation and optimal control of the casting process of Machine element, the author proposed a study based on the numerical simulation and optimal control of the casting process of composite Machine element. Firstly, the author analyzed the structural characteristics of composite Machine element, introduced them in detail, and studied their casting technology in combination with the actual situation. Secondly, the casting process of composite Machine element was simulated by using numerical simulation method, and the temperature field and flow field in the casting filling and solidification process were analyzed. Finally, selecting square cylinders with different wall thicknesses as typical components, the scheme design of traditional single casting process and multi material composite casting process based on dieless casting composite forming technology were carried out. Finite element numerical simulation and experimental research were conducted on the two processes, respectively. The results indicate that: The casting obtained by the multi material composite casting process almost solidifies simultaneously around 200 seconds later, and the graphite morphology around the casting is Type A, with a length of about 100 um, with small differences and uniform distribution; The minimum difference in tensile strength around the casting is about 3.8%, and the maximum increase in tensile strength value is 21%. This research achievement can provide technical reference for high-performance and high-quality casting of complex iron castings. In order to improve the casting quality, the author optimized the casting process of composite Machine element by numerical simulation.

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Section: Mechanical Property Testing Of Square Cylindersmentioning

confidence: 99%

Numerical Simulation and Optimal Control of Composite Nonlinear Mechanical Parts Casting Process

Li,

Wang

2024

SCPE

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“…Mouritz [25] modified the established model by considering the effects of microcracks, z-pin angle deviations, and porosity increase generated during the actual fabrication process. Zhang [26] developed a novel micromechanical modeling approach to predict the partially debonding of Z-pins reinforced composite laminates after the cure process. Nguyen [27] modeled the failure mechanism of the single-pin test, and conducted a sensitivity analysis of the Z-pin high-diameter L/D aspect ratio under the shear and tension mode mixing ratio (MMR) failure mode.…”

Section: Introductionmentioning

confidence: 99%

Z‐pin effect on interlaminar mechanical and ablation performance of quartz‐phenolic composites

Huan

et al. 2022

Polymer Composites

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When a spacecraft flies at a high speed through a high‐heat flow, the ablative composites suffer from severe delamination and bulging due to their weak interlaminar performance. This will interfere normal operations of spacecraft. To improve the interlaminar performance of ablative composites is of great significance to the ablative structures. This study investigated Z‐pin reinforced quartz‐phenolic composites and reinforcement mechanism. First, a thermogravimetry (TG) test was used to analyze the thermal decomposition process of the phenolic. Second, a series of tests, including a single Z‐pin pull‐out, a single‐lap joint tensile and an oxyacetylene ablation test, were conducted to investigate composites' ablation performance. We also deployed a 3D morphometer and an infrared thermography to reveal the function of Z‐pins. The results demonstrated that Z‐pins can improve composites' ablation performance in both structure and function. In the structure, Z‐pins suppress the interlaminar delamination of composites by enhancing the interlaminar strength. As the ablation time increases, interface bridging between the Z‐pin and laminates contributes increasingly to the interlaminar shear strength of laminates. After 60 s of ablation in a flame of 920°C, the interlaminar shear strength of Z‐pin specimens is 84.66% stronger than that of the normal composites. In the function, the Z‐pins suppress large areas of bulges by providing escape channels for pyrolysis gas, and reduce bulging areas by 60%. Z‐pin technology can effectively suppress mechanical erosion of the ablative surface due to the delamination and bulging. It is an important way to improve ablation performance of ablative structures.

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Collaborative multi‐scale optimization of molding processes for thermosetting/quartz fiber composites based on balancing between efficiencies and mechanical properties

Yuan,

Chen,

Gao

et al. 2024

Polymer Composites

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In terms of the interplay between manufacturing cost and quality during the molding of fiber reinforced thermosetting composites, this study proposes a multi‐scale collaborative optimization strategy aimed at shortening molding time and reducing the diminishing defects generated during the process. Macro‐scale thermochemical and micro‐scale thermomechanical calculations are conducted on the composite molding to analyze the origins of temperature gradients and residual stresses. Then, the curing cycle, temperature gradient in the macro‐scale model, and residual stresses in the micro‐scale model are optimized by combining finite element analysis with the Non‐dominated Sorting Genetic Algorithm II. Several curing processes within the Pareto front were selected, and their impact on compressive performance was assessed through experimental analysis. Compared to the standard curing process (SCP), the optimal curing process exhibited a 41.4% reduction in maximum temperature gradient (∆Tmax), a 25.2% decrease in effective residual stress , and a 20.0% increase in compressive strength. Multi‐scale collaborative optimization strategies are integral to the advancement of production and application of fiber‐reinforced thermoset composites. Multi‐scale collaborative optimization strategies are integral to the advancement of production and application of fiber‐reinforced thermoset composites.Highlights Investigated of interactions among components in composites molding. Optimization of composite molding process with Non‐dominated Sorting Genetic Algorithm II and finite element. Examined the impact of composite molding process on compressive performance.

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Micro-mechanical modeling study of the influence of cure process on the interfacial cracking of Z-pinned laminates

Cited by 12 publications

References 44 publications

Numerical Simulation and Optimal Control of Composite Nonlinear Mechanical Parts Casting Process

Numerical Simulation and Optimal Control of Composite Nonlinear Mechanical Parts Casting Process

Z‐pin effect on interlaminar mechanical and ablation performance of quartz‐phenolic composites

Collaborative multi‐scale optimization of molding processes for thermosetting/quartz fiber composites based on balancing between efficiencies and mechanical properties

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