Comparison with Low-Velocity Impact and Quasi-staticIndentation Testing of Foam Core Sandwich Composites

Li, Yan; An, Xiaobo; Yi, Xiaosu

doi:10.7763/ijapm.2012.v2.54

Cited by 19 publications

(17 citation statements)

References 11 publications

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“…(8) The crater produced by the crack propagation and chipping in brittle material is hemispherical in shape. (9) Based on the low velocity impact characteristics reported in the literature [28,40], strain hardening and the associated effects are neglected. The negative effects of pre-existing flaws of work material, the effect of erodent rotation, etc., are also not considered at present.…”

Section: Assumptionsmentioning

confidence: 99%

Elastic Impact of Abrasives for Controlled Erosion in Fine Finishing of Surfaces

Sooraj¹,

Radhakrishnan

2013

Journal of Manufacturing Science and Engineering

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Finishing of surfaces using free abrasive impingement is one of the constructive applications of erosive wear, well suited for complex shaped engineering components with difficult-to-access surfaces. Low velocity impact of abrasives in aßuidized bed is reported as a promising choice to impart fine finish on the target surface. An improved methodology to control the erosion and to achieve ultra fine finish through elastic impact of abrasives, using a carrier type-fluidized abrasive finishing, is discussed in this paper. Using the basic concepts of impact theory and contact mechanics, a revised mathematical modei to express the depth of erosion as a function of material properties of target and erodent is proposed. Modification in erodent abrasive to introduce an elastic nature to the impact is described in detail using the theoretical model. This is substantiated through a particledropping experimental study. The effect of multiple impacts in a practical situation is also discussed through a detailed experimental study, clearly demonstrating the concepts of elastic impact erosion for surface finishing.

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Section: Assumptionsmentioning

confidence: 99%

Elastic Impact of Abrasives for Controlled Erosion in Fine Finishing of Surfaces

Sooraj¹,

Radhakrishnan

2013

Journal of Manufacturing Science and Engineering

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“…The Newmark's implicit time integration scheme is used in the present paper for solving transient dynamic equations, despite experiments have shown that low-velocity impact studies could be carried out also in static form (see, Li et al (2012)). One practical reason for carrying out a transient analysis is that dynamic effects can be captured progressively increasing the impactor velocity, thus a unique scheme can be used for a wide range of applications.…”

Section: Introductionmentioning

confidence: 99%

Impact Damage Analysis with Stress Continuity Constraints Fulfilment at Damaged-Undamaged Regions and at Layer Interfaces

Icardi

Urraci

2017

Lat. Am. j. solids struct.

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Low-velocity impacts have a relevant importance for safety of laminated and sandwich composite structures, because they are highly susceptible to damage. In this paper, a 3D cost effective zig-zag model is developed in order to efficiently simulate such impacts. It a priori fulfills the continuity of out-of-plane stresses at layer interfaces, the continuity of stresses under in-plane variation of properties across undamaged and damaged regions and it is suitable for general boundary conditions. Its main advantage is its capability to accurately predict stresses from constitutive equations at a low cost, along with being refined across the thickness keeping fixed the number of unknowns. A modified Hertzian contact law that forces the target to conform to the shape of the impactor and the Newmark's implicit time integration scheme are used for computing the contact force time history. The progressive damage analysis is carried out using stress-based criteria. Non-classical feature, a continuum damage mesomechanic model is employed that accounts for the effects of local failures in homogenized form by modifying the strain energy expression. Fiber, matrix and delamination failures are predicted using stress-based criteria, and then the modified strain energy expression is employed for computing stresses. Such modeling options enable to account for the residual properties as they are in the reality, as shown by the comparison with the damage experimentally detected. As shown by the comparison with experiments, a closed-form solution by the Galerkin's method, obtained as a series expansion of trial displacement functions, accurately simulates the contact force and the damage progressively accumulated. The results show the importance of in-plane stress continuity for obtaining accurate predictions.Keywords Impact-induced damage; 3D variable-kinematics zig-zag model; undamaged/damaged stress continuity; interlayer stress continuity; fixed d.o.f; mesomechanic damage model.

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“…Research issues in the scope of dynamic loads by means of concentrated force in composite materials and interpretation of the effects of their impacts are extremely complex. Therefore, the attempts are made to predict the resistance to dynamic loads by means of concentrated force using statistical research methods (Li et al, 2012;Nettles and Douglas, 2000;Sjoblom et al, 1998;Lagace et al, 1993;Lber, 1983;Dong et al, 2015;Kwon and Sankar, 1993). From available studies, it appears that it is possible to find an estimated assessment of the resistance to impacts on the basis of analogical static loads (Nettles and Douglas, 2000;Dong et al, 2015;Kwon and Sankar, 1993).…”

Section: Introductionmentioning

confidence: 99%

Comparison of quasi static indentation and dynamic loads of glass and carbon fibre aluminium laminates

Jakubczak

Bieniaś

2016

Aircraft Eng & Aerospace Tech

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Purpose -The purpose of this paper was to compare the response of selected hybrid Fibre Metal Laminates (FMLs) in the form of glass and carbon fibre aluminium laminates to dynamic and static loads compared together. Design/methodology/approach -The subject of examination was FMLs (Al/CFRP and Al/GFRP). The samples were subjected to low-velocity impact and quasi-static indentation. The response of laminates to the both types of loads was evaluated by comparison of force -displacement diagrams including the values of maximum forces as well as the extent and nature of structure degradation as a result of loads. Findings -In case of Al/GFRP laminates, the analysis of characteristic relations, i.e. force -displacement and the impactor influence area in case of indentation and impact confirmed that certain parameters, i.e. the values of maximum force transferred by laminate, destruction surface area and destruction mechanisms are consistent after static and dynamic tests. Significant differences were found in destruction scale in Al/GFRP laminates despite considerable fitting of force -displacement diagrams to static and dynamic tests. Destruction surface area observed in FML carbon laminates subjected to dynamic loads was significantly smaller than after indentation but perforation area occurring at the unloaded side was much more extensive. Practical implications -Research issues in the scope of dynamic loads by means of concentrated force in composite materials and interpretation of the effects of their impacts are extremely complex. Therefore, the attempts are made to predict the resistance to dynamic loads by means of concentrated force using statistical research methods. The test results might be useful for the design and simulations of FMLs applications in aerospace. Originality/value -From the analysis of available literature, it appears that there are no studies exploring the issue of forecasting or comparison the effects of static and dynamic tests for hybrid FMLs. The new hybrid materials like FMLs have different mechanisms of damage initiation and propagation as a result of impact, in comparison to classic composite materials. It means that possibilities of using the static loads to predict impact resistance should be known well for all type of FMLs. Actually, there is no research about static indentation in relation to low-velocity impact of aluminium-carbon laminates. This situation encouraged the authors of the present study to undertake research in this scope. The results can demonstrate and explain why prediction of impact resistance of FMLs by using static indentation is uncertain and not always valuable.

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Comparison with Low-Velocity Impact and Quasi-staticIndentation Testing of Foam Core Sandwich Composites

Cited by 19 publications

References 11 publications

Elastic Impact of Abrasives for Controlled Erosion in Fine Finishing of Surfaces

Elastic Impact of Abrasives for Controlled Erosion in Fine Finishing of Surfaces

Impact Damage Analysis with Stress Continuity Constraints Fulfilment at Damaged-Undamaged Regions and at Layer Interfaces

Comparison of quasi static indentation and dynamic loads of glass and carbon fibre aluminium laminates

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