Intralaminar cracking in relatively thick 90-plies of [$\pm \theta /{90}_n$]s laminates is analyzed using experimental data for two Glass fiber/Epoxy (GF/EP) material systems. Weibull parameters for transverse failure stress of the 90-ply are obtained from experimental intralaminar crack density versus applied strain data, showing that a reliable analysis requires sufficient amount of data in so called noninteractive crack density region. Monte Carlo simulations of cracking were performed using stress distribution between two cracks calculated using two models: Hashin’s model and a novel model that ensures that the average stress is exactly the same as in FEM solution. Due to its features, the Hashin’s model predicts too low intralaminar crack density (it predicts too strong interaction between cracks). The results emphasize the importance of having a proper stress distribution model when performing Monte Carlo simulations. Simulations were used not only to simulate intralaminar cracking in high and very low crack density regions but also for improving the procedure of Weibull parameter determination.

相对较厚的 90 层 [$\pm \theta /{90}_n$]s 层压板使用两种玻璃纤维/环氧树脂 (GF/EP) 材料系统的实验数据进行分析。90 层横向破坏应力的威布尔参数是从实验层内裂纹密度与应用应变数据中获得的，表明可靠的分析需要在所谓的非交互式裂纹密度区域中获得足够数量的数据。使用两个模型计算的两个裂纹之间的应力分布执行开裂的 Monte Carlo 模拟：Hashin 模型和确保平均应力与 FEM 解法中的平均应力完全相同的新模型。由于其特征，Hashin 模型预测的层内裂纹密度太低（它预测裂纹之间的相互作用太强）。结果强调了在执行 Monte Carlo 模拟时拥有合适的应力分布模型的重要性。模拟不仅用于模拟高和极低裂纹密度区域的层内裂纹，而且还用于改进威布尔参数确定的程序。