研究目的
To investigate the influence of ply angle deviation on the out-of-plane deformation of composite space mirrors subjected to temperature changes.
研究成果
The research concludes that ply angle deviation significantly affects out-of-plane deformation in composite space mirrors. Key findings include: PV is proportional to the magnitude of angle deviation, ply thickness, and distance from the midplane; deformation from two-ply deviations follows the parallelogram law; and random deviations lead to a Rayleigh distribution of PV. The most effective way to improve surface accuracy is to reduce the standard deviation of angle deviations, followed by decreasing ply thickness and optimizing layup sequences. These insights are applicable to both temperature and moisture-induced deformations.
研究不足
The study is based on numerical simulations and may not account for all real-world manufacturing variabilities or environmental conditions. The finite element model assumes specific constraints and material properties, which could limit generalizability. The analysis focuses on temperature changes; while similar to moisture effects, direct experimental validation is not provided.
1：Experimental Design and Method Selection:
The study used numerical analysis methods, including Monte Carlo stochastic finite element method (MCSFEM) and statistical analysis, to simulate the effects of fixed and random ply angle deviations on out-of-plane deformation in symmetric quasi-isotropic layup sequences.
2：Sample Selection and Data Sources:
Six typical layup sequences with varying ply thicknesses (
3：10 mm and 075 mm) and orientations were analyzed, based on a finite element model of a 500 mm diameter space mirror part of a sphere with a 3200 mm diameter. Material parameters for unidirectional carbon-fiber composite M40J/E602 were used. List of Experimental Equipment and Materials:
Finite element software (specific name not provided) was used for simulations; no physical equipment was mentioned. Materials included carbon fiber reinforced plastics (CFRP) with specified properties.
4：Experimental Procedures and Operational Workflow:
Angle deviations (fixed or random) were applied to plies in the layup sequences, and structural responses (stress, strain, PV) were computed using MCSFEM with up to 10,000 iterations. Data were analyzed statistically to derive probability distributions.
5：Data Analysis Methods:
Statistical analysis included mean and variance calculations, linear and nonlinear fittings (e.g., Rayleigh distribution), and superposition principles to interpret results.
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