Review of the Mechanical Properties of Cast Steels With Emphasis on Fatigue Behavior and the Influence of Microdiscontinuities

1977 ◽  
Vol 99 (4) ◽  
pp. 329-343 ◽  
Author(s):  
M. R. Mitchell
Keyword(s):  
Mechanical Properties ◽  
Fatigue Behavior ◽  
Matrix Metal ◽  
Cast Steels ◽  
The Matrix ◽  
Strength And Ductility

Mechanical properties of cast steels are pronouncedly affected by the microdiscontinuities which they inherently contain. In particular, fatigue behavior of cast steels is altered by (1) the size, (2) the shape, and (3) the distribution of microdiscontinuities as well as (4) the strength and ductility of the matrix metal. A review is made of the literature in order to demonstrate the necessity of accounting for all of these variables and a technique for predicting the fatigue behavior of cast steels is presented.

Comparison of Shear, Compressive and Tensile Characteristics of Cast Irons

1973 ◽  
Vol 15 (1) ◽  
pp. 53-60 ◽  
Author(s):  
R. D. Adams ◽  
M. A. O. Fox
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Design Criteria ◽  
Matrix Structure ◽  
Proof Stress ◽  
Cast Irons ◽  
The Matrix ◽  
The Relationship ◽  
Graphite Inclusions ◽  
Strength And Ductility

Cast irons were produced with variations in the quantity and shape of the free graphite inclusions and in the matrix structure to investigate the relationship between the shear, compressive and tensile mechanical properties. Differences were observed which may have a significant effect on design criteria for cast irons. For example, the ratio of shear to tensile strengths decreased from about 1·25 to 0·577 and the ratio of 0·1 per cent proof stress in compression to that in tension decreased from approximately 2 to 11 as the tensile strength (and ductility) were increased.

Mechanical and Thermoviscoelastic Behavior of Clay/Epoxy Nanocomposites

2002 ◽  
Vol 740 ◽  
Author(s):  
Jandro L. Abot ◽  
Asma Yasmin ◽  
Isaac M. Daniel
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Clay Content ◽  
Fiber Reinforced Composite ◽  
Pure Epoxy ◽  
Reinforced Composite ◽  
Thermosetting Polymers ◽  
The Matrix ◽  
Inorganic Nanocomposites ◽  
Strength And Ductility

ABSTRACTThe study of organic-inorganic nanocomposites has become relevant in recent years since these materials exhibit synergistic properties derived from the two components. Thermosetting polymers like epoxies that have high mechanical properties provide a baseline for further improvement with the addition of nanoclay particles. These nanocomposites can be used as the matrix of a fiber reinforced composite and lead to higher matrix dominated mechanical properties including elastic modulus, strength and fracture toughness. This study concentrates on the mechanical and thermoviscoelastic properties in the glassy regime of nanocomposites prepared by direct mixing. The elastic modulus of the nanocomposites was found to improve with respect to the pure epoxy modulus at the expense of both tensile strength and ductility regardless of clay content. The glass transition temperature was also found to decrease as well. The morphology of the nanocomposites was studied and correlated with the aforementioned properties.

Mechanical and Morphological Studies of Al6061-Gr-SiC Hybrid Metal Matrix Composites

2015 ◽  
Vol 813-814 ◽  
pp. 195-202 ◽  
Author(s):  
T. Lokesh ◽  
U.S. Mallikarjun
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
Matrix Material ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Morphological Studies ◽  
The Matrix ◽  
Strength And Ductility

Abstract. In recent years, Aluminium alloy based metal matrix composites (MMC) are gaining wide spread acceptance in several aerospace and automobile applications. These composites possess excellent wear resistance in addition to other superior mechanical properties such as strength, modulus and hardness when compared with conventional alloys. The hybrid composites are new generation of composites containing more than one type, shape or sizes of reinforcements giving superior combined properties of reinforcements and the matrix. In the present work, Al6061 has been used as matrix material and the reinforcing materials selected were SiC and Graphite particulates of 10 to 30µm size. Composites Al6061-Gr (2- 8 wt. %), Al6061-SiC (2 -10wt. %) and Hybrid composites with Al6061 matrix alloy containing 3wt% graphite and varying composition of 2-10wt% SiCp were prepared by stir casting technique. The cast matrix alloy and its composites have been subjected to solutionizing treatment at a temperature of 530 ± 20C for 6 hours, followed by ageing at a temperature of 175 ± 20C for 6 hours. The mechanical properties of as cast and T6 heat treated composites have been evaluated as per ASTM standards and compared. Addition of Graphite particulates into the Al6061 matrix improved the strength and ductility of the composites. Significant improvement in tensile strength and hardness was noticed as the wt. % of SiCp increases in Al6061-SiC composites. Addition of Graphite into Al6061-SiC further improved the strength and ductility of hybrid composites. The heat treatment process had the profound effect in improving the mechanical properties of the studied composites. The microstructural studies revealed the uniform distribution of SiC and Gr particles in the matrix system.

Diffusion of Oxygen and Nitrogen in the Ti-15Mo Alloy Used for Biomedical Applications

2012 ◽  
Vol 326-328 ◽  
pp. 696-701 ◽  
Author(s):  
José Roberto Severino Martins ◽  
Renata Abdallah Nogueira ◽  
Raul Oliveira de Araújo ◽  
Carlos Roberto Grandini
Keyword(s):  
Mechanical Properties ◽  
Diffusion Coefficients ◽  
Biomedical Applications ◽  
Good Combination ◽  
Mechanical Spectroscopy ◽  
Matrix Metal ◽  
Excellent Corrosion Resistance ◽  
The Matrix ◽  
Exponential Factors ◽  
Interstitial Elements

The Ti-15Mo alloy is a promising material for use as a biomaterial because of its excellent corrosion resistance and its good combination of mechanical properties, such as fatigue, hardness, and wears resistance. This alloy has a body-centered predominantly cubic crystalline structure and the addition of interstitial atoms, such as oxygen and nitrogen, strongly alters its mechanical properties. Mechanical spectroscopy is a powerful tool to study the interaction of interstitial elements with the matrix metal or substitutional solutes, providing information such as the distribution and the concentration of interstitial elements. The objective of this paper is to study of the effects of heavy interstitial elements, such as oxygen and nitrogen, on the anelastic properties of the Ti-15Mo alloy by using mechanical spectroscopy measurements. In this study, the diffusion coefficients, pre-exponential factors, and activation energies were calculated for the oxygen in the Ti-15Mo alloy.

scholarly journals The Influence of Dispersion Time On The Mechanical Properties of Spark Plasma Sintered Carbon Nanotubes Reinforced Nickel-Aluminium Matrix Composites

2021 ◽  
Author(s):  
Olusoji Oluremi Ayodele ◽  
Mary Ajimegoh Awotunde ◽  
Bukola Joseph Babalola ◽  
Peter Apata Olubambi
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Ball Milling ◽  
High Speed ◽  
Structural Integrity ◽  
Matrix Composites ◽  
Matrix Metal ◽  
The Matrix ◽  
Spark Plasma ◽  
High Speed Ball Milling

Abstract Nickel (Ni) and aluminium (Al) powders were milled with carbon nanotubes (CNT) by employing the high-speed ball milling approach, and the consolidation was achieved by spark plasma sintering technology (SPS). The microstructural evolution of the milled samples and consolidated samples were examined, and the mechanical properties were investigated. The outcome indicated the agglomeration of CNT within the NiAl matrix, and the CNT dispersions improved with the milling duration. The structural integrity of the CNT was evaluated using the Raman analysis which depicted that the ID/IG ratio decreased from 0.986 to 0.867 as the high-speed ball milling was longer, which also depicts more damage to the CNT. The microhardness of the consolidated composite was enhanced from 287.7 HV-320.4 HV due to better dispersion of CNT within the matrix metal. Furthermore, the predicted tensile strength and yield strength of the composite improved from 4011.9 MPa-4428.8 MPa, and from 5747.9 MPa-6389.3 MPa.

scholarly journals Strengthening and Weakening Effects of Particles on Strength and Ductility of SiC Particle Reinforced Al-Cu-Mg Alloys Matrix Composites

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1219
Author(s):  
Zhiyu Yang ◽  
Jianzhong Fan ◽  
Yanqiang Liu ◽  
Junhui Nie ◽  
Ziyue Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Yield Strength ◽  
Ultimate Strength ◽  
Fracture Morphology ◽  
Mg Alloys ◽  
Matrix Composites ◽  
Sic Particles ◽  
The Matrix ◽  
Strength And Ductility

The strengthening and weakening effects of SiC particles on composite strength and ductility were studied. Al-Cu-Mg alloys matrices with three different mechanical properties were used. Their yield strength, ultimate strength, and elongation range from 90 to 379 MPa, 131 to 561 MPa, and 18% to 31%, respectively. SiC particles with sizes of 4, 8, 12, 15, 20, and 30 μm were used to reinforce these three matrices, separately, and the composites of eighteen combinations of the particle sizes and matrix strengths were manufactured. Yield strength, ultimate strength, elongation, and fracture morphology of these composites were characterized. Based on the analysis, the strengthening to weakening behavior on strength and ductility were comprehensively discussed. The critical particle size having the best ductility was obtained. The strengthening limit and match range of the particle and the matrix to achieve effective strengthening were defined as a function of the particle size and matrix strength. This work offers an important reference for optimization of mechanical properties of the particle-reinforced metal matrix composites.

Mechanical properties and fatigue behavior of CO2 laser beam welded armor steel joints

2020 ◽  
Vol 62 (7) ◽  
pp. 689-697
Author(s):  
Zulkuf Balalan ◽  
Furkan Sarsilmaz ◽  
Omer Ekinci
Keyword(s):  
Mechanical Properties ◽  
Laser Beam ◽  
Co2 Laser ◽  
Fatigue Behavior ◽  
Armor Steel ◽  
Steel Joints

Morphology and Mechanical Properties of Polyethylene Terephthalate/Ethylene Propylene Diene Monomer (PET/EPDM) in the Presence of Nanoclay

2020 ◽  
Vol 57 (3) ◽  
pp. 249-259
Author(s):  
Baifen Liu ◽  
Mohammad Mirjalili ◽  
Peiman Valipour ◽  
Sajad Porzal ◽  
shirin Nourbakhsh
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Thermal Destruction ◽  
Processing Temperature ◽  
Tem Analysis ◽  
Maximum Stiffness ◽  
Cloisite 30B ◽  
Nano Clay ◽  
The Matrix ◽  
Sample Maximum

This research deals with the mechanical properties, microstructure, and interrelations of triple nanocomposite based on PET/EPDM/Nanoclay. These properties were examined in different percentages of PET/EPDM blend with compatibilizer (Styrene-Ethylene/Butylene-Styrene)-G-(Maleic anhydrate) (SEBS-g-MAH). Results showed that the addition of 15% SEBS-g-MAH improved the toughness and impact strength of this nanocomposite. SEM micrographs indicated the most stable fuzzy microstructure in a 50/50 mixture of scattered phases of EPDM/SEBS-g-MAH. The effects of percentages of 1, 3, 5, 7 nanoclay Cloisite 30B (C30B) on the improvement of the properties were evaluated. With the addition of nano clay, the toughness and impact strength was reduced. Thermal destruction of nanoclay in processing temperature led to the decreasing dispersion of clay plates in the matrix and a reduction in the distances of nano clay plates in the composite compared to pure nano clay. XRD and TEM analysis was used to demonstrate the results. By adding 1% of nanoclay to the optimal sample, maximum stiffness, and Impact strength, among other nanocomposites, was achieved.

scholarly journals Preparation of Long Sisal Fiber-Reinforced Polylactic Acid Biocomposites with Highly Improved Mechanical Performance

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1124
Author(s):  
Zhifang Liang ◽  
Hongwu Wu ◽  
Ruipu Liu ◽  
Caiquan Wu
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Mechanical Performance ◽  
Tensile Elongation ◽  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Impact Performance ◽  
The Matrix ◽  
Blending Process ◽  
Extension Direction

Green biodegradable plastics have come into focus as an alternative to restricted plastic products. In this paper, continuous long sisal fiber (SF)/polylactic acid (PLA) premixes were prepared by an extrusion-rolling blending process, and then unidirectional continuous long sisal fiber-reinforced PLA composites (LSFCs) were prepared by compression molding to explore the effect of long fiber on the mechanical properties of sisal fiber-reinforced composites. As a comparison, random short sisal fiber-reinforced PLA composites (SSFCs) were prepared by open milling and molding. The experimental results show that continuous long sisal fiber/PLA premixes could be successfully obtained from this pre-blending process. It was found that the presence of long sisal fibers could greatly improve the tensile strength of LSFC material along the fiber extension direction and slightly increase its tensile elongation. Continuous long fibers in LSFCs could greatly participate in supporting the load applied to the composite material. However, when comparing the mechanical properties of the two composite materials, the poor compatibility between the fiber and the matrix made fiber’s reinforcement effect not well reflected in SSFCs. Similarly, the flexural performance and impact performance of LSFCs had been improved considerably versus SSFCs.

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