The Experts below are selected from a list of 6063 Experts worldwide ranked by ideXlab platform
Christos Kassapoglou - One of the best experts on this subject based on the ideXlab platform.
-
Prediction of delamination onset and growth for AP-PLY composite laminates using the finite element method
Composites Part A: Applied Science and Manufacturing, 2017Co-Authors: Weiling Zheng, Christos KassapoglouAbstract:Abstract A recently developed fibre placement architecture, Advanced Placed Ply (AP-PLY), has been shown to have promising damage tolerance characteristics for composite structures. Understanding delamination creation and growth in such architecture is of particular concern. Approaches to predict delamination onset in AP-PLY architectures and to analyse delamination growth are presented. The recovered interlaminar Stresses between layers combined with a Maximum Stress Criterion were used to determine delamination onset of simple AP-PLY composite laminates under out-of-plane loads. 2D finite element models with cohesive elements inserted at the interfaces of woven layers were used to evaluate the delamination initiation and propagation in different woven patterns of simple AP-PLY composite beams. The predictions were compared to results from the Stress recovery method and to test results. The parameters of the woven pattern, such as woven angle, number of woven plies, number of straight filling plies, and the location of the woven patterns through the thickness direction, were investigated and shown to have a significant effect on delamination creation and growth.
-
Prediction of delamination onset and growth for AP-PLY composite laminates using the finite element method Part A Applied science and manufacturing
Composites, 2017Co-Authors: Weiling Zheng, Christos KassapoglouAbstract:A recently developed fibre placement architecture, Advanced Placed Ply (AP-PLY), has been shown to have promising damage tolerance characteristics for composite structures. Understanding delamination creation and growth in such architecture is of particular concern. Approaches to predict delamination onset in AP-PLY architectures and to analyse delamination growth are presented. The recovered interlaminar Stresses between layers combined with a Maximum Stress Criterion were used to determine delamination onset of simple AP-PLY composite laminates under out-of-plane loads. 2D finite element models with cohesive elements inserted at the interfaces of woven layers were used to evaluate the delamination initiation and propagation in different woven patterns of simple AP-PLY composite beams. The predictions were compared to results from the Stress recovery method and to test results. The parameters of the woven pattern, such as woven angle, number of woven plies, number of straight filling plies, and the location of the woven patterns through the thickness direction, were investigated and shown to have a significant effect on delamination creation and growth.
Weiling Zheng - One of the best experts on this subject based on the ideXlab platform.
-
Prediction of delamination onset and growth for AP-PLY composite laminates using the finite element method
Composites Part A: Applied Science and Manufacturing, 2017Co-Authors: Weiling Zheng, Christos KassapoglouAbstract:Abstract A recently developed fibre placement architecture, Advanced Placed Ply (AP-PLY), has been shown to have promising damage tolerance characteristics for composite structures. Understanding delamination creation and growth in such architecture is of particular concern. Approaches to predict delamination onset in AP-PLY architectures and to analyse delamination growth are presented. The recovered interlaminar Stresses between layers combined with a Maximum Stress Criterion were used to determine delamination onset of simple AP-PLY composite laminates under out-of-plane loads. 2D finite element models with cohesive elements inserted at the interfaces of woven layers were used to evaluate the delamination initiation and propagation in different woven patterns of simple AP-PLY composite beams. The predictions were compared to results from the Stress recovery method and to test results. The parameters of the woven pattern, such as woven angle, number of woven plies, number of straight filling plies, and the location of the woven patterns through the thickness direction, were investigated and shown to have a significant effect on delamination creation and growth.
-
Prediction of delamination onset and growth for AP-PLY composite laminates using the finite element method Part A Applied science and manufacturing
Composites, 2017Co-Authors: Weiling Zheng, Christos KassapoglouAbstract:A recently developed fibre placement architecture, Advanced Placed Ply (AP-PLY), has been shown to have promising damage tolerance characteristics for composite structures. Understanding delamination creation and growth in such architecture is of particular concern. Approaches to predict delamination onset in AP-PLY architectures and to analyse delamination growth are presented. The recovered interlaminar Stresses between layers combined with a Maximum Stress Criterion were used to determine delamination onset of simple AP-PLY composite laminates under out-of-plane loads. 2D finite element models with cohesive elements inserted at the interfaces of woven layers were used to evaluate the delamination initiation and propagation in different woven patterns of simple AP-PLY composite beams. The predictions were compared to results from the Stress recovery method and to test results. The parameters of the woven pattern, such as woven angle, number of woven plies, number of straight filling plies, and the location of the woven patterns through the thickness direction, were investigated and shown to have a significant effect on delamination creation and growth.
C Soutis - One of the best experts on this subject based on the ideXlab platform.
-
strength prediction of bolted joints in cfrp composite laminates using cohesive zone elements
Composites Part B-engineering, 2014Co-Authors: A Atas, C SoutisAbstract:Abstract A strength prediction method is developed for bolted joints in CFRP composite laminates using cohesive zone elements (CZEs). Three-dimensional finite element models were developed with one element per laminate layer using the ANSYS software (ANSYS, 2009) [1]. CZEs were embedded into the subcritical (matrix based) damage locations that were determined from the X-ray radiographs as detailed in Atas and Soutis (2013) [2]. CZEs use a strength-based failure Criterion to predict the onset of damage and a fracture mechanics based approach to predict its growth. The material properties required to simulate the subcritical damage modes were the interfacial strength, fracture energies and the nonlinear shear Stress–strain behaviour of the particular material system used. The strength of the joints was determined through the load–displacement curves of the cross-ply laminates and by a simple Maximum Stress Criterion for the quasi-isotropic specimens. It has been shown that the effect of various joint geometries and laminate lay-ups on the joint strength was accounted for by the method developed.
F. Martín De La Escalera - One of the best experts on this subject based on the ideXlab platform.
-
High strain rate behaviour of 5-harness-satin weave fabric carbon-epoxy composite under compression and combined compression-shear loading
International Journal of Solids and Structures, 2015Co-Authors: H Koerber, Y. E. Essa, Pedro P. Camanho, J. Xavier, F. Martín De La EscaleraAbstract:The strain rate dependent mechanical behaviour was studied for the common out-of-autoclave aerospace textile composite 5-harness-satin carbon-epoxy. End-loaded 15°,30° and 45° off-axis and 90° compression tests were carried out at three different strain rate levels (4×10-4s-1,200s-1 and 1000s-1) to determine the effect of strain rate for transverse compression and combined transverse compression/in-plane shear loading. The dynamic tests were carried out on a split-Hopkinson pressure bar, where high speed photography and digital image correlation allowed a detailed study of the specimen deformation and failure process. Quasi-static reference tests were carried out on an electro-mechanical test machine using the same specimen type and a static DIC system. Pronounced strain rate effects on the axial Stress-strain response were observed for all specimen types. Failure envelopes for the combined σ22c-τ12 Stress state were derived from the experimental data and compared with the Maximum Stress Criterion, which appears well suited to approximate the experimental failure envelope at all strain rate levels. It was observed that the failure envelope was simply scaled up with increasing strain rate, while the overall shape was found to be strain rate independent.
A Atas - One of the best experts on this subject based on the ideXlab platform.
-
strength prediction of bolted joints in cfrp composite laminates using cohesive zone elements
Composites Part B-engineering, 2014Co-Authors: A Atas, C SoutisAbstract:Abstract A strength prediction method is developed for bolted joints in CFRP composite laminates using cohesive zone elements (CZEs). Three-dimensional finite element models were developed with one element per laminate layer using the ANSYS software (ANSYS, 2009) [1]. CZEs were embedded into the subcritical (matrix based) damage locations that were determined from the X-ray radiographs as detailed in Atas and Soutis (2013) [2]. CZEs use a strength-based failure Criterion to predict the onset of damage and a fracture mechanics based approach to predict its growth. The material properties required to simulate the subcritical damage modes were the interfacial strength, fracture energies and the nonlinear shear Stress–strain behaviour of the particular material system used. The strength of the joints was determined through the load–displacement curves of the cross-ply laminates and by a simple Maximum Stress Criterion for the quasi-isotropic specimens. It has been shown that the effect of various joint geometries and laminate lay-ups on the joint strength was accounted for by the method developed.