Delamination initiation and migration modeling in clamped tapered laminated beam specimens under static loading

Adluru, Hari K.; Hoos, Kevin H.; Iarve, Endel V.; Ratcliffe, James G.

doi:10.1016/j.compositesa.2018.12.020

Cited by 26 publications

(3 citation statements)

References 20 publications

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“…Most researchers have used failure criteria in their analyses when investigating laminate composite structures seeking to diagnose the damage before it happens, thus avoiding a possible collapse of the structures (Sjølund and Lund, 2018; Lund, 2018; Adluru et al , 2019; Ghayoor et al , 2019; Diniz et al , 2019).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Optimum design of composite structures with ply drop-offs using response surface methodology

Diniz

Mendéz

Almeida

et al. 2021

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Purpose Many studies only take into account the ply stacking sequence as the design variable to determine the optimal ply drop-off location; however, it is necessary to optimize other parameters that have a direct influence on the ply drop-off site such as which plies should be dropped and in which longitudinal direction. That way, the purpose of this study is to find the most significant design variables relative to the drop-off location considering the transversal and longitudinal positions, seeking to achieve the optimal combination of ply drop-off locations that provides excellent performance for the laminate plate. Design/methodology/approach This study aims to determine the optimal drop-off location in a laminate plate using the finite element method and an approach statistical with design of experiments (DOE). Findings The optimization strategy using DOE revealed to be satisfactory for analyzing laminate structures with ply drop-offs, demonstrating that not all design factors influence the response variability. The failure criterion response variable revealed a poor fit, with an adjusted coefficient of determination lower than 60%, thus demonstrating that the response did not vary with the ply drop-off location. Already the strain and natural frequency response variables presented high significance. Finally, the optimization strategy revealed that the optimal drop-off location that minimizes the strain and maximizes the natural frequency is the ply drop-off located of the end plate. Originality/value It was also noted that many researchers prefer evolutionary algorithms for optimizing composite structures with ply drop-offs, being scarce to the literature studies involving optimization strategies using response surface methodology. In addition, many studies only take into account the ply stacking sequence as the design variable to determine the optimal ply drop-off location; however, in this study, the authors investigated other important parameters that have direct influence on the ply drop-off site such as which plies should be dropped and in which longitudinal direction.

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Section: Theoretical Backgroundmentioning

confidence: 99%

“…A full factorial design was generated first, aiming to recognize the influence of the design factors on the ply drop-off locations, as shown in Tables A1 and A2.…”

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confidence: 99%

Optimum design of composite structures with ply drop-offs using response surface methodology

Diniz

Mendéz

Almeida

et al. 2021

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“…In recent years, the damage-mechanics approach has been attracting attention in the usage of damage modeling for composite bonded joints, as it performs the most accurate failure predictions. Significant progress has been achieved in developing progressivedamage analysis (PDA) methodologies, which are able to capture damage initiation and evolution in composites and predict their strength and durability for various lay-ups and geometries [19][20][21][22][23][24][25][26]. The most commonly used progressive-damage model is called the cohesive zone model (CZM); the concept was first proposed by Barenblatt [27] and Dugdale [28], who described the damage under static loads with no need of an initial crack.…”

Section: Introductionmentioning

confidence: 99%

Influence of Failure-Load Prediction in Composite Single-Lap Joints with Brittle and Ductile Adhesives Using Different Progressive-Damage Techniques

Chuang,

Su,

Liang

2024

Polymers

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The usage of adhesively bonded joints, such as single-lap and double-lap joints, is increasing rapidly in aerospace composite structures as a popular alternative to bolts and rivets. Compared to the conventional joining methods such as fastening and riveting, adhesive-bonding technology better prevents damage to composite structures due to the smooth configuration and the mitigation of stress concentration around holes. In this work, the built-in progressive-damage-modeling techniques in Abaqus, including the cohesive zone model (CZM) and the virtual crack closure technique (VCCT), are used to predict the strength and progressive failure of composite single-lap joints subjected to tensile loading. Modeling of an adhesive layer by using a zero/non-zero-thickness cohesive element, cohesive surface, and VCCT is investigated, as is the effect of brittle and ductile adhesives. Two-dimensional finite-element models with different damage-modeling strategies are performed in this study. The failure-load predictions are compared with the experimental results obtained from the literature. For the ductile adhesive, the predicted failure loads using a zero/non-zero-thickness cohesive elements and a cohesive surface are all shown to be in good agreement with the experiments. However, the VCCT technique predicts higher failure loads. For a brittle adhesive, on the other hand, the predictions by zero/non-zero-thickness cohesive elements and cohesive surfaces reveal notable deviations compared to the experimental results. In contrast to the ductile adhesive, the VCCT technique is revealed to be accurate in predicting the brittle adhesive.

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Regularized X‐FEM Modeling of Arbitrary 3D Interacting Crack Networks

Iarve,

Zhou,

Ballard

et al. 2024

Numerical Meth Engineering

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An extension to the Regularized eXtended Finite Element Method (RX‐FEM) is proposed that allows arbitrary 3D cracks through a novel hierarchical enrichment algorithm. The technique avoids geometric consideration of how a crack cuts elements or intersects other cracks. Each crack is described separately in terms of its sign distance function and regularized step function, which are only recorded for nodes in the region where the gradient of the regularized step function is non‐zero. The algorithm creates a set of superimposed nodes, referred to as node twins, and elements, referred to as twinned elements, for each crack and determines the connectivity of the element twins using the involved crack indices. The displacement jump is calculated between each pair of element twins corresponding to the same crack, and a cohesive zone model (CZM) is formulated for each pair of twins to model crack opening. Following the theory for the novel method, several examples are presented that illustrate capabilities of the new method that the traditional RX‐FEM formulation lacked. A quasi‐2D example of offset crack propagation is considered and successfully compared with published results. Additionally, two 3D examples involving perpendicularly intersecting cracks are considered, illustrating the intersection of two crack fronts and correct partitioning of the domain into eight fragments due to three crossing cracks, respectively.

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Delamination initiation and migration modeling in clamped tapered laminated beam specimens under static loading

Cited by 26 publications

References 20 publications

Optimum design of composite structures with ply drop-offs using response surface methodology

Optimum design of composite structures with ply drop-offs using response surface methodology

Influence of Failure-Load Prediction in Composite Single-Lap Joints with Brittle and Ductile Adhesives Using Different Progressive-Damage Techniques

Regularized X‐FEM Modeling of Arbitrary 3D Interacting Crack Networks

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