Material orthotropy effects on progressive damage analysis of open-hole composite laminates under tension

Abstract

The sizes effects on the strengths of open-hole fibre-reinforced composite laminates subjected to tensile loading (OHT) have been investigated widely. However, little attention has been paid to the influence of material orthotropy. This paper presents a progressive damage model for the model failure of notched laminates under tensile loading based on continuum damage mechanics and cohesive elements. The effects of orthotropy on the failure of notched laminates with seven different ply sequences are investigated by our proposed model. The prediction results adopting the Hoffman and Pinho failure criterions to determine matrix damage initiation are compared with the results of experiments. Our proposed models are able to predict the strong influence of orthotropy on strengths of open-hole laminate under tension, and model using Pinho criterion can predict the open-hole tension strength most accurately.

Prediction of fracture toughness due to delamination in cross-ply composite laminates considering interlaminar and intralaminar cracking and inhomogeneous fiber-matrix modeling

“…In Figure 4, K is the slope of first linear segment, d is the damage parameter, G c is the critical strain energy release rate, σ 0 m is the maximum stress, at which the damage initiates that, and δ 0 m is the equivalent separation. δ m formulation is presented in equation (2).…”

“…To predict the intralaminar progressive failure behavior of fibrous composites under static and fatigue loading, one category of the simulations are macro-mechanical models that have been presented in ref. [1][2][3][4] Jalalvand et al 1 and Zhou et al [2][3][4] proposed two material degradation models in this category for prediction of damage in composite laminates. To increase the accuracy of prediction, some researchers such as Okabe et al 4 and Mohammadi et al 5,6 developed and utilized multi-scale modeling via coupled micromechanics and continuum damage mechanics.…”

Сравнительное Изучение Влияния Технологий Фрезерования И Резки Гидроабразивной Струей На Поведение Эпоксидных Слоистых Углепластиков При Растяжении

“…Установили, что усталостная и статическая прочности при внеосевом растяжении меньше, чем при осевом растяжении, и уменьшались с увеличением угла внесоосности, что сопровождалось нелинейным поведением. В [13] исследовали моды разрушения образцов с отверстием при растяжении. В [14,15] экспериментально изучали влияние концентрации напряжений на прочность при растяжении образцов с отверстием из тканых композитов с саржевым переплетенем 2×2.…”

Effect of fatigue loading on stiffness degradation, energy dissipation, and matrix cracking damage of CFRP [±45]3Scomposite laminate

“…19 The modified Paris crack growth equation-based CZM has emerged as a promising tool for predicting inter-ply delamination and matrix crack density in fibre-reinforced composites. The experimental and cohesive zone approach has provided an ideal agreement for composite laminates, 20 open-hole laminates, 21 adhesive joints, 22,23 nanocomposites, 24 and biomaterial interfaces. 25 The efficient prediction of crack growth rate, inter-ply delamination, and residual life under low-or high-cyclic fatigue loading is also possible through CZM approach.…”