Comparison of Failure for Thin-Walled Composite Columns

Różyło, Patryk

doi:10.3390/ma15010167

Cited by 29 publications

(15 citation statements)

References 75 publications

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“…This is a major limitation for scientists who research this type of structure. It should be added that FEM modelling may be interesting for considering the progressive failure and failure processes in composites [ 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 ]. For this reason, future research directions will focus on the analysis of the post-critical state in the full range of loads leading to the damage and failure of the composite structure.…”

Section: Resultsmentioning

confidence: 99%

Sensitivity of Compressed Composite Channel Columns to Eccentric Loading

2022

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This study investigated short thin-walled channel columns made of carbon/epoxy laminate. Columns with two multi-ply composite layups [0/45/−45/90]s and [90/−45/45/0]s were tested, with each layup having eight plies symmetric to the midplane. The columns were subjected to compressive loads, including an eccentric compressive load applied relative to the center of gravity of their cross-section. Simple support boundary conditions were applied to the ends of the columns. The scope of the study included analyzing the effect of load eccentricity on the buckling mode, bifurcation load (idealized structure), and critical load (structure with initial imperfections). The critical load for the actual structure was determined with the use of approximation methods, based on experimental postbuckling equilibrium paths. In parallel with the experiments, a numerical analysis was conducted using the finite element method and Abaqus® software (Dassault Systèmes, Vélizy-Villacoublay, France). The first stage of the numerical analysis consisted of solving an eigenproblem, in order to determine the mode of the loss of structural stability and to calculate the bifurcation loads for structures under axial and eccentric compression. The second stage of the numerical analysis involved examining the non-linear state of pre-deflected structures. Numerical postbuckling equilibrium paths were used to estimate the critical loads with an approximation method. The experimental results were used to validate the numerical models. This made it possible to determine the effect of compressive load eccentricity on the buckling mode and critical load of the tested structures. The results confirmed that compressive load eccentricity had a significant impact on the load-carrying capacity in the postbuckling range. This may potentially lead to premature damage to composite materials and, ultimately, to a reduced load-carrying capacity of structures.

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Section: Resultsmentioning

confidence: 99%

Sensitivity of Compressed Composite Channel Columns to Eccentric Loading

2022

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“…Previous studies on thin-walled elements made of composite materials have primarily been experimental analyzes and numerical analyses conducted via the finite element method [ 61 , 62 ]. On the other hand, studies related to the assessment of the influence of machining parameters on the machinability of composite materials have been conducted, too [ 63 , 64 ].…”

Section: Discussionmentioning

confidence: 99%

“…Research on thin-walled composite materials is still a relatively recent issue. In the production process, composite materials are created when formed in special molds; therefore, most studies are focused on investigating the strength and damage of composite profiles by experimental techniques and the finite element method [ 61 , 62 ]. Composite materials are machined due to insufficient surface quality of parts after forming in molds.…”

Section: Introductionmentioning

confidence: 99%

Milling of Three Types of Thin-Walled Elements Made of Polymer Composite and Titanium and Aluminum Alloys Used in the Aviation Industry

Ciecieląg

Zaleski

2022

Materials

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The machining of thin-walled elements used in the aviation industry causes may problems, which create a need for studying ways in which undesirable phenomena can be prevented. This paper presents the results of a study investigating face milling thin-walled elements made of titanium alloy, aluminum alloy and polymer composite. These materials were milled with folding double-edge cutters with diamond inserts. The results of maximum vertical forces and surface roughness obtained after machining elements of different thicknesses and unsupported element lengths are presented. The results of deformation of milled elements are also presented. The results are then analyzed by ANOVA. It is shown that the maximum vertical forces decrease (in range 42–60%) while the ratio of vertical force amplitude to its average value increases (in range 55–65%) with decreasing element thickness and increasing unsupported element length. It is also demonstrated that surface roughness deteriorates (in range 100% for aluminum, 30% titanium alloy, 15% for CFRP) with small element thicknesses and long unsupported element lengths. Long unsupported element lengths also negatively (increasing deformation several times) affect the accuracy of machined elements.

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“…Carbon fiber reinforced composite has been widely used in the aerospace field, such as for the tail and fuselage of aircraft [1], due to its high specific strength, specific stiffness, and corrosion resistance [2,3]. Delamination is an important damage mechanism for this kind of material [4,5]. It is of great significance to obtain the mechanical properties of the laminate with delamination efficiently for evaluating the state of the laminate and predicting the remaining life [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the dynamic Bayesian network (DBN), p * 1 is identified using the time varying load-strain data of stage 1 in the experiment. 4.…”

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confidence: 99%

Identification of Multiple Mechanical Properties of Laminates from a Single Compressive Test

et al. 2022

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In-plane elastic and interlaminar properties of composite laminates are commonly obtained through separate experiments. In this paper, a simultaneous identification method for both properties using a single experiment is proposed. The mechanical properties of laminates were treated as uncertainties and Bayesian inference was employed with measured strain-load curves in compression tests of laminates with embedded delamination. The strain–load curves were separated into two stages: the pre-delamination stage and the post-delamination stage. Sensitivity analysis was carried out to determine the critical properties at different stages, in order to alleviate the ill-posed problem in inference. Results showed that the in-plane Young’s modulus and shear modulus in elastic properties are dominant in the pre-delamination stage, and the interlaminar strength and type I fracture toughness in interlaminar properties are dominant in the post-delamination stage. Five times of property identification were carried out; the maximum coefficient of variation of identified properties was less than 1.11%, and the maximum error between the mean values of the identified properties and the ones from standard experiments was less than 5.44%. The proposed method can reduce time and cost in obtaining multiple mechanical properties of laminates.

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Comparison of Failure for Thin-Walled Composite Columns

Cited by 29 publications

References 75 publications

Sensitivity of Compressed Composite Channel Columns to Eccentric Loading

Sensitivity of Compressed Composite Channel Columns to Eccentric Loading

Milling of Three Types of Thin-Walled Elements Made of Polymer Composite and Titanium and Aluminum Alloys Used in the Aviation Industry

Identification of Multiple Mechanical Properties of Laminates from a Single Compressive Test

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