Effect of single-period overload parameters on fatigue crack retardation for high-density polyethylene

Kamal, Abdallah; Showaib, Ezzat A.; Elsheikh, Ammar H.

doi:10.1016/j.tafmec.2022.103249

Cited by 15 publications

(5 citation statements)

References 49 publications

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“…Moreover, the finite element (FE) method has been adopted due to its wide applicability and good accuracy [15][16][17]. Jing et al studied the influence of specimen sizes on the restraint intensity of rigid butt-jointed specimens and VRC specimens, and the quantitative relationship between the specimen sizes (e.g., thickness, width, etc.)…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Restraint Intensities and Welding Residual Stresses in the Ti80 T-Joints

Zhang

Wang

Chen

et al. 2023

Metals

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The restraint intensity of Ti80 T-joints was investigated using finite element analyses. The influence of slit height, vertical plate thickness and base plate thickness was studied, respectively. Results show that the slit height and vertical plate thickness have a significant impact, while the effect of base plate thickness is negligible. A prediction model of restraint intensity was constructed through binary linear regression; the error was estimated at about 10%. Then, finite element simulations were carried out to study the welding residual stresses of specimens with different restraint intensities. The results show that residual stresses on the backing weld surface are higher in the middle and lower at both ends, while the weld root shows opposite results. In general, stresses at the weld root are greater than those on the weld surface. The mean value of the residual stress at the weld root increases with the increase in restraint intensity but not uniformly, i.e., it is slow at first and then it increases rapidly. A prediction model of the residual stress was produced through cubic fitting, and the errors between the finite element simulations and predictions were about 8%. Using the prediction model, the residual stress of actual Ti80 alloy workpieces can be estimated before welding, and a corresponding strategy for avoiding cracks can be generated.

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Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Restraint Intensities and Welding Residual Stresses in the Ti80 T-Joints

Zhang

Wang

Chen

et al. 2023

Metals

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“…For example, a polymer-based composite was investigated by Elsheik [ 28 ] for energy harvesting; also, manufacturing has become a very important sector for polymers applications [ 29 ]. Polymeric materials have become indispensable in many industries, therefore understanding how the imposed workload impacts them (such as crack propagation [ 30 ]) and how to avoid these problems is crucial. Polymer doping has been thoroughly investigated and established to improve many properties, from mechanical to optical ones [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Polymer Doping as a Novel Approach to Improve the Performance of Plasmonic Plastic Optical Fibers Sensors

Pitruzzella

Rovida

Perri

et al. 2023

Sensors

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In this work, Fe2O3 was investigated as a doping agent for poly(methyl methacrylate) (PMMA) in order to enhance the plasmonic effect in sensors based on D-shaped plastic optical fibers (POFs). The doping procedure consists of immerging a premanufactured POF sensor chip in an iron (III) solution, avoiding repolymerization and its related disadvantages. After treatment, a sputtering process was used to deposit a gold nanofilm on the doped PMMA in order to obtain the surface plasmon resonance (SPR). More specifically, the doping procedure increases the refractive index of the POF’s PMMA in contact with the gold nanofilm, improving the SPR phenomena. The doping of the PMMA was characterized by different analyses in order to determine the effectiveness of the doping procedure. Moreover, experimental results obtained by exploiting different water–glycerin solutions have been used to test the different SPR responses. The achieved bulk sensitivities confirmed the improvement of the plasmonic phenomenon with respect to a similar sensor configuration based on a not-doped PMMA SPR-POF chip. Finally, doped and non-doped SPR-POF platforms were functionalized with a molecularly imprinted polymer (MIP), specific for the bovine serum albumin (BSA) detection, to obtain dose-response curves. These experimental results confirmed an increase in binding sensitivity for the doped PMMA sensor. Therefore, a lower limit of detection (LOD), equal to 0.04 μM, has been obtained in the case of the doped PMMA sensor when compared to the one calculated for the not-doped sensor configuration equal to about 0.09 μM.

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“…Ramadan et al performed [ 19 ] simulations of thermally induced fatigue in a multi-disc brake during aircraft braking. Furthermore, COMSOL Multiphysics was used by Kamal et al [ 20 ] to evaluate the fatigue crack retardation of composite materials used in industrial brakes, by Elsheikh et al [ 21 ] to demonstrate a new temperature field reconstruction method proposed for thin-wall disc, and also by Jeong et al [ 22 ] for a series of simulations regarding ECBs suitable for small wind turbines.…”

Section: Introductionmentioning

confidence: 99%

A Thermo-Mechanical Stress Based Fatigue Life Evaluation of a Mine Hoist Drum Brake System Using COMSOL Multiphysics

et al. 2022

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In this study, the fatigue usage factors for Findley and Matake stress-based criteria were determined in the case of an MK5×2 mine hoist drum brake system subjected to cyclic maneuver braking. The study was conducted for this type of brake system, because the majority of mine hoists in Romanian mines are equipped with this brake type, being in operation for several decades. A geometric model of the brake was built using SolidWorks and imported in COMSOL Multiphysics to perform thermo-mechanical simulations. Based on the deformations and von Mises stresses determined by the thermomechanical simulation and, considering the calculated endurance limits of the brake system materials, Matake and Findley fatigue life evaluation simulations from COMSOL’s fatigue module were conducted. The results show that the highest fatigue is expected on the drum lining surface towards the exit point from under the brake shoe in both cases, and the values of the usage factor of 0.307 (Findley) and 0.401 (Matake) are both under the critical value 1, meaning that the stress limit has not been exceeded for the brake system components and, thus, failure is not expected. Simulations were conducted considering an estimated 1.06 × 105 cycles during one year, more than both the usual service/replacement interval of the friction components of the brake, and the period of mandatory technical inspections imposed by regulations.

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Effect of single-period overload parameters on fatigue crack retardation for high-density polyethylene

Cited by 15 publications

References 49 publications

Finite Element Analysis of Restraint Intensities and Welding Residual Stresses in the Ti80 T-Joints

Finite Element Analysis of Restraint Intensities and Welding Residual Stresses in the Ti80 T-Joints

Polymer Doping as a Novel Approach to Improve the Performance of Plasmonic Plastic Optical Fibers Sensors

A Thermo-Mechanical Stress Based Fatigue Life Evaluation of a Mine Hoist Drum Brake System Using COMSOL Multiphysics

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