Experimental and numerical estimation of the damage level in multilayered composite plates

Romanowicz, Paweł

doi:10.1002/mawe.201700243

Cited by 12 publications

(8 citation statements)

References 19 publications

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“…These methods and their advantages and disadvantages are described in the Introduction. Considering recent possibilities of the computers and high-speed cameras with high resolution, the DIC system seems to be convenient in the application of damage detection and growth [ 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ]. With the use of the professional DIC system, it is possible to achieve good quantitative and qualitative calculation of displacements and strains fields over the investigated surface.…”

Section: Dic and Fem Analysesmentioning

confidence: 99%

“…The detailed description of the different algorithms applied in DIC software and the basics of the DIC technique can be found in [ 51 ]. Generally, the DIC is used for detection and characterization of the surface damage [ 50 , 52 , 53 , 54 , 55 , 56 , 57 ], performance analyses of the structural objects [ 58 , 59 , 60 , 61 ], characterization of material properties [ 62 , 63 ], and damage detection under impact loadings [ 64 , 65 , 66 ]. The precision of the method depends on the camera resolution, quality of its optics, light intensity, and others.…”

Section: Introductionmentioning

confidence: 99%

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Application of DIC Method in the Analysis of Stress Concentration and Plastic Zone Development Problems

2020

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The paper presents the assessment of the possibility and reliability of the digital image correlation (DIC) system for engineering and scientific purposes. The studies were performed with the use of samples made of the three different materials—mild S235JR + N steel, microalloyed fine‑grain S355MC steel, and high strength 41Cr4 steel subjected to different heat‑treatment. The DIC studies were focused on determinations of dangerous zones with large stress concentrations, plastic deformation growth, and prediction of the failure zone. Experimental tests were carried out for samples with different notches (circular, square, and triangular openings). With the use of the DIC system and microstructure analyses, the influence of different factors (laser cutting, heat treatment, material type, notch shape, and manufacturing quality) on the material behavior were studied. For all studied cases, the stress concentration factors (SCF) were estimated with the use of the analytical formulation and the finite element analysis. It was observed that the theoretical models for calculations of the influence of the typical notches may result in not proper values of SCFs. Finally, the selected results of the total strain distributions were compared with FEM results, and good agreement was observed. All these allow the authors to conclude that the application of DIC with a common digital camera can be effectively applied for the analysis of the evolution of plastic zones and the damage detection for mild high‑strength steels, as well as those normalized and quenched and tempered at higher temperatures.

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Section: Dic and Fem Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of DIC Method in the Analysis of Stress Concentration and Plastic Zone Development Problems

2020

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“…The crack initiation location and propagation path prediction by DIC have previously been investigated and proven in many studies. [19][20][21][22]. In the case of "O1" tool steel, Figure 6(4) shows high strain concentrations (in red) that resulted in metal cracks and fracture ( Figure 6(3)).…”

Section: Fracture Of Specimensmentioning

confidence: 99%

Mechanical Properties and Microstructure Characterization of AISI “D2” and “O1” Cold Work Tool Steels

Algarni

2019

Metals

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This research analyzes the mechanical properties and fracture behavior of two cold work tool steels: AISI “D2” and “O1”. Tool steels are an economical and efficient solution for manufacturers due to their superior mechanical properties. Demand for tool steels is increasing yearly due to the growth in transportation production around the world. Nevertheless, AISI “D2” and “O1” (locally made) tool steels behave differently due to the varying content of their alloying elements. There is also a lack of information regarding their mechanical properties and behavior. Therefore, this study aimed to investigate the plasticity and ductile fracture behavior of “D2” and “O1” via several experimental tests. The tool steels’ behavior under monotonic quasi-static tensile and compression tests was analyzed. The results of the experimental work showed different plasticity behavior and ductile fracture among the two tool steels. Before fracture, clear necking appeared on “O1” tool steel, whereas no signs of necking occurred on “D2” tool steel. In addition, the fracture surface of “O1” tool steel showed cup–cone fracture mode, and “D2” tool steel showed a flat surface fracture mode. The dimple-like structures in scanning electron microscope (SEM) images revealed that both tool steels had a ductile fracture mode.

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“…The optimal choice of the structure parameters becomes particularly important in the case of boilers subjected to cyclic loadings, when the risk of premature failure exists. Such problems can be analyzed with the application of the fracture mechanics criteria, which were recently compared and discussed in [16]. There are two commonly-used boiler codes for the calculation of pressure apparatuses (EN 12952:3 [10], EN 13445-3 [11]).…”

Section: Introductionmentioning

confidence: 99%

“…The optimal choice of the structure parameters becomes particularly important in the case of boilers subjected to cyclic loadings, when the risk of premature failure exists. Such problems can be analyzed with the application of the fracture mechanics criteria, which were recently compared and discussed in [16]. The main aim of this paper is the optimization of the stress relief groove and flat end geometry with respect to the Standards EN 13445-3 in order to decrease or eliminate plastic deformation in pressure vessels.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Flat Ends in Pressure Vessels

Szybiński

Romanowicz

2019

Materials

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The application of flat ends in pressure boilers is inevitably associated with the presence of stress concentration, which is observed in the vicinity of the junction of the cylinder and the closing flat plate. The analyzed flat end plates with stress relief grooves fall into the group of solutions recognized by the respective Standards of Calculations of Pressure Vessels. Unfortunately, no clear evidence is given in the Standards on how to choose the best groove parameters. This opens up the problem of the optimal choice of the groove parameters providing a minimum stress level. Even for the optimal values defining the stress relief groove geometry, certain plastic deformations are observed in the groove area for materials which exhibit elastic-plastic properties. Such a situation is completely unacceptable during exploitation, and a suitable reduction of the operating pressure is necessary. This paper discusses the effectiveness of other designs for flat ends used in pressure vessels. The proposed modifications took the form of external ribs applied around the top of the endplate circumference. The dimensions of these ribs were set using parametric optimization. The results of the study encouraged the authors to perform a more general analysis with the use of topology optimization. The results of all performed studies proved that the reduction of stress concentration and the full elimination of plastic deformation are possible. All numerical calculations were made using the finite element code (FEM), Ansys.

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Experimental and numerical estimation of the damage level in multilayered composite plates

Cited by 12 publications

References 19 publications

Application of DIC Method in the Analysis of Stress Concentration and Plastic Zone Development Problems

Application of DIC Method in the Analysis of Stress Concentration and Plastic Zone Development Problems

Mechanical Properties and Microstructure Characterization of AISI “D2” and “O1” Cold Work Tool Steels

Optimization of Flat Ends in Pressure Vessels

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