Mechanical properties and fatigue life detection of copper particle filled polyester composite material under rotating bending load

Among natural fibers used to make composite structure, kenaf has been selected in this study due to its excellent mechanical and physical properties. The use of kenaf reinforced composites is not only limited to the lightweight applications such as laptop and mobile phone casing but also in heavy duty applications such as truck bodies and marine structures. Hence, this study investigates on the woven kenaf hybrid composites through fatigue test in order to understand their mechanical properties. The results revealed that the composite material had a significant degradation of fatigue life when increasing the stress percentage.

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The Hardness Evolution of Cast and the High-Cycle Fatigue Life Change of Wrought Ni-Base Superalloys after Additional Heat Treatment

Materials ◽

10.3390/ma14237427 ◽

2021 ◽

Vol 14 (23) ◽

pp. 7427

Author(s):

Juraj Belan ◽

Lenka Kuchariková ◽

Eva Tillová ◽

Miloš Matvija ◽

Milan Uhríčik

Keyword(s):

Mechanical Properties ◽

Fatigue Life ◽

Asymmetry Parameter ◽

High Cycle Fatigue ◽

Volume Fraction ◽

Structural Parameters ◽

Cycle Fatigue ◽

Cycle Asymmetry ◽

Bending Load ◽

Modern Technologies

Concerning the use of modern technologies and manufacturing systems in the production of high-stress components from Ni-base superalloys and the optimization of the production process, knowledge of the microstructure–mechanical properties relationship is very important. The microstructure of Ni-base superalloys is very closely related to the chemical composition. With the high number of alloying elements, various phases are presented in the structure of Ni-base superalloys, which have a predominantly positive effect on the mechanical properties, but also phases that reduce, in particular, the heat resistance of these materials. The aim of the presented paper is the quantification of structural parameters of two types of cast alloys, ZhS6K and IN738, where the effect of dwell at 10 and 15 h at 800 °C on the change in morphology and volume fraction of the γ′-phase precipitate was studied. The detected changes were verified by the Vickers hardness test. The IN718 superalloy was chosen as a representative of the wrought superalloy. This alloy was also annealed for 72 h at a temperature of 800 °C, and the quantification of structural parameters was performed by EDS mapping and TEM analysis. Another partial goal was to assess the effect of changes in the volume fraction of the γ′-phase and δ-phase on the change in the high-cycle fatigue life of superalloy IN 718. This superalloy was tested by dynamic cyclic loading with cycle asymmetry parameter R = −1 at an ambient temperature of 22 ± 5 °C and at a temperature of 700 ± 5 °C and with cycle asymmetry parameter R < 1 (three-point bending load) after annealing at 700 °C/72 h. The results of the quantitative analyses and fatigue tests will be further used in optimizing the design of Ni-base superalloy components by modern technologies such as additive technologies for the production of turbine blades and implemented within the philosophy of Industry 4.0.

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Effect of Periodic Overloads on Short Fatigue Crack Behavior in CuNi2Si Alloy under Rotating Bending Load

Metals ◽

10.3390/met10091267 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1267

Author(s):

Yahang Qin ◽

Bing Yang ◽

Bo Feng ◽

Yifan Li ◽

Shoune Xiao ◽

...

Keyword(s):

Fatigue Crack ◽

Fatigue Life ◽

Fatigue Cracks ◽

Fatigue Crack Initiation ◽

Constant Load ◽

Multiple Cracks ◽

Short Fatigue Crack ◽

Crack Behavior ◽

Bending Load ◽

Rotating Bending

In this study, the short fatigue crack behavior in a precipitation-strengthened CuNi2Si alloy was investigated using a replica technique under rotating bending loads with periodic overloads, an overload ratio of 1.5, and the stress ratio of both was R = −1. The results show that all the fatigue cracks originated from the surface of the specimen and displayed a trend of slow initiation and then rapid propagation. The introduction of overloads significantly reduced the fatigue crack initiation time and the fatigue life of the sample. The average life of the overloaded samples was only 31% that of the constant load samples. For overload specimens, multiple cracks grew at the same time and merged at different stages, causing the crack length to increase instantaneously after they merged, thereby considerably reducing the fatigue life. Fractographical analysis and observation of the surface-etched sample replica film showed that cracks in samples with and without overload both propagated along the grain boundaries.

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Atomic structure of interface of intermetallic compound TiAl and nitride Ti2AIN using HREM and image processing

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100087161 ◽

1991 ◽

Vol 49 ◽

pp. 570-571

Author(s):

E. Sukedai ◽

H. Mabuchi ◽

H. Hashimoto ◽

Y. Nakayama

Keyword(s):

Mechanical Properties ◽

Image Processing ◽

Composite Material ◽

Intermetallic Compound ◽

Side Surface ◽

High Resolution Electron Microscopy ◽

Hexagonal Structure ◽

Second Phase ◽

Resolution Electron ◽

Compound Tial

In order to improve the mechanical properties of an intermetal1ic compound TiAl, a composite material of TiAl involving a second phase Ti2AIN was prepared by a new combustion reaction method. It is found that Ti2AIN (hexagonal structure) is a rod shape as shown in Fig.1 and its side surface is almost parallel to the basal plane, and this composite material has distinguished strength at elevated temperature and considerable toughness at room temperature comparing with TiAl single phase material. Since the property of the interface of composite materials has strong influences to their mechanical properties, the structure of the interface of intermetallic compound and nitride on the areas corresponding to 2, 3 and 4 as shown in Fig.1 was investigated using high resolution electron microscopy and image processing.

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A Study of Some Mechanical and Physical Properties for Palm Fiber/Polyester Composite

Engineering and Technology Journal ◽

10.30684/etj.v38i3b.598 ◽

2020 ◽

Vol 38 (3B) ◽

pp. 104-114

Author(s):

Samah M. Hussein

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Dielectric Constant ◽

Date Palm ◽

Volume Fraction ◽

Unsaturated Polyester ◽

Dielectric Strength ◽

Palm Fiber ◽

Mechanical And Physical Properties ◽

Polyester Composite

This research has been done by reinforcing the matrix (unsaturated polyester) resin with natural material (date palm fiber (DPF)). The fibers were exposure to alkali treatment before reinforcement. The samples have been prepared by using hand lay-up technique with fiber volume fraction of (10%, 20% and 30%). After preparation of the mechanical and physical properties have been studied such as, compression, flexural, impact strength, thermal conductivity, Dielectric constant and dielectric strength. The polyester composite reinforced with date palm fiber at volume fraction (10% and 20%) has good mechanical properties rather than pure unsaturated polyester material, while the composite reinforced with 30% Vf present poor mechanical properties. Thermal conductivity results indicated insulator composite behavior. The effect of present fiber polar group induces of decreasing in dielectric strength, and increasing dielectric constant. The reinforcement composite 20% Vf showed the best results in mechanical, thermal and electrical properties.

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Mechanical Property Studies on Flax Fiber Reinforced Basalt Powder Filled Polyester Composite

Current Materials Science ◽

10.2174/2666145413999201208125024 ◽

2020 ◽

Vol 13 ◽

Author(s):

V. Arumugaprabu ◽

K.Arun Prasath ◽

S. Mangaleswaran ◽

M. Manikanda Raja ◽

R. Jegan

Keyword(s):

Mechanical Properties ◽

Mechanical Property ◽

Natural Fiber ◽

Tensile Load ◽

Flax Fiber ◽

Flexural Properties ◽

Weight Percentage ◽

Tensile Impact ◽

Polyester Composite ◽

Additional Support

: The objective of this research is to evaluate the tensile, impact and flexural properties of flax fiber and basalt powder filled polyester composite. Flax fiber is one of the predominant reinforcement natural fiber which possess good mechanical properties and addition of basalt powder as a filler provides additional support to the composite. The Composites are prepared using flax fiber arranged in 10 layers with varying weight percentage of the basalt powder as 5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, 25 wt.% and 30 wt.% respectively. From the results it is inferred that the composite combination 10 Layers of flax / 5 wt.%, basalt Powder absorbs more tensile load of 145 MPa. Also, for the same combination maximum flexural strength is about 60 MPa. Interestingly in the case of impact strength more energy was absorbed by 10 layers of flax and 30 wt.% of basalt powder. In addition, the failure mechanism of the composites also discussed briefly using SEM studies.

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Prediction of fatigue strength of micro-specimen on copper and aluminium alloys under rotating bending load

10.1063/5.0023035 ◽

2020 ◽

Author(s):

Haftirman ◽

Teguh Prioyono ◽

Muhammad Kholil ◽

Dinalant Al Tanggaraju ◽

Mohd Arif Anuar Mohd Salleh ◽

...

Keyword(s):

Fatigue Strength ◽

Aluminium Alloys ◽

Bending Load ◽

Rotating Bending

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Factorial approach for multiple optimization of mechanical properties of alternative composite material for manufacture/repair flight surfaces (WING TIP - FAIRING ASSY)/CIDFAE

Materials Today Proceedings ◽

10.1016/j.matpr.2020.11.256 ◽

2021 ◽

Author(s):

Paredes Juan ◽

Silva Vinicio ◽

Vaca Henry ◽

Enríquez Víctor ◽

Arroba Cesar

Keyword(s):

Mechanical Properties ◽

Composite Material ◽

Factorial Approach ◽

Wing Tip

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Acoustic Emission and K-S Metric Entropy as Methods for Determining Mechanical Properties of Composite Materials

Sensors ◽

10.3390/s21010145 ◽

2020 ◽

Vol 21 (1) ◽

pp. 145

Author(s):

Lesław Kyzioł ◽

Katarzyna Panasiuk ◽

Grzegorz Hajdukiewicz ◽

Krzysztof Dudzik

Keyword(s):

Mechanical Properties ◽

Acoustic Emission ◽

Composite Material ◽

Composite Materials ◽

Testing Machine ◽

Measurement Data ◽

Entropy Method ◽

Displacement Sensor ◽

Metric Entropy ◽

Plastic Phase

Due to the unique properties of polymer composites, these materials are used in many industries, including shipbuilding (hulls of boats, yachts, motorboats, cutters, ship and cooling doors, pontoons and floats, torpedo tubes and missiles, protective shields, antenna masts, radar shields, and antennas, etc.). Modern measurement methods and tools allow to determine the properties of the composite material, already during its design. The article presents the use of the method of acoustic emission and Kolmogorov-Sinai (K-S) metric entropy to determine the mechanical properties of composites. The tested materials were polyester-glass laminate without additives and with a 10% content of polyester-glass waste. The changes taking place in the composite material during loading were visualized using a piezoelectric sensor used in the acoustic emission method. Thanks to the analysis of the RMS parameter (root mean square of the acoustic emission signal), it is possible to determine the range of stresses at which significant changes occur in the material in terms of its use as a construction material. In the K-S entropy method, an important measuring tool is the extensometer, namely the displacement sensor built into it. The results obtained during the static tensile test with the use of an extensometer allow them to be used to calculate the K-S metric entropy. Many materials, including composite materials, do not have a yield point. In principle, there are no methods for determining the transition of a material from elastic to plastic phase. The authors showed that, with the use of a modern testing machine and very high-quality instrumentation to record measurement data using the Kolmogorov-Sinai (K-S) metric entropy method and the acoustic emission (AE) method, it is possible to determine the material transition from elastic to plastic phase. Determining the yield strength of composite materials is extremely important information when designing a structure.

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Study on Mechanical Properties of the Composite Materials Film by Speckle Projection Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.496.281 ◽

2012 ◽

Vol 496 ◽

pp. 281-284

Author(s):

Wen Wen Liu ◽

Zhi Wang ◽

Yun Hai Du ◽

Xian Zhong Xu ◽

Da Quan Liu ◽

...

Keyword(s):

Mechanical Properties ◽

Composite Material ◽

Composite Materials ◽

Projection Method ◽

Dynamic Deformation ◽

Calibration Method ◽

Deformation Measurement ◽

Lens Distortion

An improved accurate speckle projection method is used for study the mechanical properties of the composite material film in the paper. A system for deformation measurement is developed with the telecentric lenses, in which such conventional lens’ disadvantages such as lens distortion and perspective error will be diminished. Experiments are performed to validate the availability and reliability of the calibration method. The system can also be used to measure the dynamic deformation and then results are also given.

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