scholarly journals Analysis of the Mechanical Properties Change of PA6/MMT Nanocomposite System after Ageing

2017 ◽  
Vol 756 ◽  
pp. 52-59 ◽  
Author(s):  
Ľudmila Dulebová ◽  
František Greškovič ◽  
Janusz W. Sikora ◽  
Volodymyr Krasinskyi
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Tensile Test ◽  
Polymer Nanocomposites ◽  
Uv Radiation ◽  
Environmental Degradation ◽  
Impact Resistance ◽  
Charpy Impact ◽  
Cloisite 30B ◽  
Nanocomposite System

The paper deals with the influence of environmental degradation on the change of the mechanical properties of polymer nanocomposites. The tested material was polyamide (PA) filled with nanoclay fillers Cloisite 30B, Cloisite 93A and Cloisite Na + in a volume of 2, 4 and 6 wt%. Test samples were produced by injection molding and were subjected to 540 hours and 1080 hours of UV radiation. The change of mechanical properties of PA6/MMT nanocomposite systems after the ageing in the UV chamber was studied by tensile test and Charpy impact resistance test. Article also compares structure of PA6/MMT nanocomposite.

scholarly journals Influence of normalizing post carburizing treatment on microstructure, mechanical properties and fracture behavior of low alloy gear steels

2021 ◽  
Vol 8 (5) ◽  
pp. 836-851
Author(s):  
Hiremath Pavan ◽  
◽  
M. C. Gowrishankar ◽  
Shettar Manjunath ◽  
Sharma Sathyashankara ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Impact Resistance ◽  
Charpy Impact ◽  
Carbon Steels ◽  
Mode Analysis ◽  
Low Carbon ◽  
The Core ◽  
Wide Range ◽  
Before And After ◽  
Fine Pearlite

<abstract> <p>Steel is a versatile metal, got a wide range of applications in all the fields of engineering and technology. Generally, low carbon steels are tough and high alloy carbon steels are hard in nature. Certain applications demand both properties in the same steel. Carburization is one such technique that develops hard and wear resistant surfaces with a soft core. The objective of this work is to study the influence of post carburizing treatment (normalizing) on three grades of steels (EN 3, 20MnCr5, and EN 353). Post carburizing treatments are necessary to overcome the adverse effects of carburization alone. Here carburization was carried out in the propane atmosphere by heating the gas carburizing furnace to 930 ℃ for more than a day. Normalizing was carried out at 870 ℃ for 1 h and cooled in air. Tensile, hardness, Charpy impact tests along with SEM (scanning electron microscopy) and EDAX (energy dispersive X-ray analysis) were conducted to analyze the phase transformation, failure mode analysis in all the samples. Carburized steels displayed the formation of ferrite, pearlite, and sometimes bainite phases in the core and complete coarse pearlite in the case regions, whereas in the post carburized steels, increased amount of ferrite, fine pearlite, and bainite in the core and fine pearlite with traces of bainite in the case region was observed. Normalizing also refines the grain with increased UTS (ultimate tensile strength), hardness, and impact resistance. EN 353 showed higher UTS among the steels with 898 MPa after carburization and 1370 MPa after normalizing treatment. Maximum hardness of 48 HRC was observed in 20MnCr5 and toughness was superior in EN 3 with energy absorbed during test i.e., 8 and 12 J before and after normalizing treatment. Based on the fracture surface analysis, in EN 353 steel, a finer array of dimples with voids and elongated bigger clustered dimples containing ultrafine dimples array are observed in the core and case respectively during carburizing whereas, more density of river pattern and cleavage failure (brittle) are observed in the core and case respectively after post carburizing (normalizing) treatment. There is a reduction in the ductility of the steels after post carburizing treatment. It was observed that normalizing treatment produces superior mechanical properties in the carburized steels by grain refinement and strong microstructures like bainite. Normalizing as post carburizing treatment can be recommended for engineering applications where ductile core and hard surface are of great importance.</p> </abstract>

scholarly journals Processability and Degradability of PHA-Based Composites in Terrestrial Environments

2019 ◽  
Vol 20 (2) ◽  
pp. 284 ◽  
Author(s):  
Patrizia Cinelli ◽  
Maurizia Seggiani ◽  
Norma Mallegni ◽  
Vito Gigante ◽  
Andrea Lazzeri
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Production Cost ◽  
Impact Resistance ◽  
Wood Industry ◽  
Waste Wood ◽  
Wood Sawdust ◽  
Plant Nursery ◽  
Terrestrial Environments ◽  
Morphology And Mechanical Properties

In this work, composites based on poly(3-hydroxybutyrate-3-hydroxyvalerate) (PHB-HV) and waste wood sawdust (SD) fibers, a byproduct of the wood industry, were produced by melt extrusion and characterized in terms of processability, thermal stability, morphology, and mechanical properties in order to discriminate the formulations suitable for injection molding. Given their application in agriculture and/or plant nursery, the biodegradability of the optimized composites was investigated under controlled composting conditions in accordance with standard methods (ASTM D5338-98 and ISO 20200-2004). The optimized PHB-HV/SD composites were used for the production of pots by injection molding and their performance was qualitatively monitored in a plant nursery and underground for 14 months. This study presents a sustainable option of valuation of wood factory residues and lowering the production cost of PHB-HV-based compounds without affecting their mechanical properties, improving their impact resistance and biodegradability rates in terrestrial environments.

Structural Integrity Evaluation of API 5L X65 Pipe Subjected to Pre-Strain up to Tensile Strain Using the API 579 Procedure

2007 ◽  
Vol 345-346 ◽  
pp. 1353-1356
Author(s):  
Jong Hyun Baek ◽  
Cheol Man Kim ◽  
Young Pyo Kim ◽  
Chang Sung Seok
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tensile Test ◽  
Structural Integrity ◽  
Mechanical Damage ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Ground Subsidence ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement

Mechanical properties of the pre-strained material are different with those of virgin material without pre-strain. Buried pipelines for natural gas transmission may be deformed by outside force such as ground subsidence, ground liquefaction, cold bending and mechanical damage. Plastic deformation affects the tensile properties and fracture toughness. The effects of prestrain on the mechanical properties of API 5L X65 pipe were diversely investigated through the tensile test, crack tip opening displacement test and Charpy impact test. Axial tensile pre-strain of 1.5, 5 and 10% was applied to plate-type tensile specimens cut from the pipe body prior to mechanical testing. Tensile test revealed that yield strength and tensile strength were increased with increasing tensile pre-strain. However, Fracture toughness for crack initiation decreased with increasing tensile pre-strain. Structural integrity evaluation of the API 5L X65 pipe with crack-like flaws was assessed by using the level 2 in the API 579 code.

Impact Properties of Hot-Worked Gamma Alloys with BCC β-Ti Phase

2004 ◽  
Vol 842 ◽  
Author(s):  
Kentaro Shindo ◽  
Toshimitsu Tetsui ◽  
Toshiro Kobayashi ◽  
Shigeki Morita ◽  
Satoru Kobayashi ◽  
...  
Keyword(s):  
Tensile Test ◽  
High Strain Rate ◽  
Strain Rate ◽  
Tial Alloy ◽  
Impact Test ◽  
High Strain ◽  
Impact Resistance ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Foreign Object

ABSTRACTImpact resistance of a hot-forged TiAl alloy with a composition of Ti-42∼44Al-5∼10M: M=V, Mn(at%), consisting of lamellar, γ and β grain of which the hot-workability was improved by introducing β phase, has been investigated using an instrumented Charpy impact test, tensile test at high strain rate and foreign object attack test. In instrumented Charpy impact test the absorbed energies for crack initiation and propagation were measured, and the effect of microstructure on the absorbed energies has been analyzed, by paying attention to the grain size, interlamellar spacing and lamellar area fraction. In tensile test at high strain rate, the dependence of strain rate of hot-extruded TiAl alloy is obtained and compared with that of Nickel based superalloy, Inconel 713C. In foreign object attack test with taper plate specimen modified turbine blade and brass ball as foreign object, the relation between impact damage and thickness of specimen at attack point is investigated. A limit of impact energy, at which there isn't a crack on buck of attack point, is obtained with each thickness about hot-forged TiAl alloy, Ti-42Al-5Mn. Therefore, the method of improvement of toughness and assessment of impact resistance of TiAl alloy is shown in this study.

scholarly journals Injection Molding and Mechanical Properties of Bio-Based Polymer Nanocomposites

Materials ◽  
2018 ◽  
Vol 11 (4) ◽  
pp. 613 ◽  
Author(s):  
Maria Mistretta ◽  
Luigi Botta ◽  
Marco Morreale ◽  
Sebastiano Rifici ◽  
Manuela Ceraulo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Polymer Nanocomposites

Effect of Different Concentrations and Sizes of Particles of Rice Husk Ash - RHS in the Mechanical Properties of Polypropylene

2010 ◽  
Vol 660-661 ◽  
pp. 23-28 ◽  
Author(s):  
G.C. Nascimento ◽  
D.M. Cechinel ◽  
R. Piletti ◽  
Erlon Mendes ◽  
M.M.S. Paula ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Waste Product ◽  
Impact Resistance ◽  
Charpy Impact ◽  
Polymeric Materials ◽  
Optical Microscope ◽  
Uniaxial Tensile ◽  
Production Cycle

The minerals powders are much applied on polymeric materials to better its properties and to promote new applications. The rice husk ash powder - RHS is a mineral compound has been applied on polymeric compounds to increase the stiffness. This work presents studies of different sizes of particles of RHS applied at different concentrations in polypropylene. To study the mechanical properties were applied techniques of Charpy Impact Resistance and Uniaxial Tensile Analysis. The morphology was observed using the optical microscope. The results showed that the CCA may be an alternative in the incorporation of mineral loads in polypropylene, since this is a waste product generated in the production of rice, thus the complete closure of the production cycle of the cereal.

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