Analysis of the Mechanical Behavior of Ceramic Filters of the Systems Al2O3-LZSA and Al2O3-SiC

2014 ◽  
Vol 798-799 ◽  
pp. 707-712
Author(s):  
Wagner Lopes Torquato ◽  
E.G. Ramalho ◽  
Wilson Acchar
Keyword(s):  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Compression Test ◽  
Replica Method ◽  
Ceramic Filters ◽  
The Subject

Ceramic filters processed by the replica method have been the subject of increasing research during the late years. In this research, ceramic filters of both 10 and 20 ppi of the systems Al2O3-LZSA and Al2O3-SiC, obtained by the replica method, have been mechanically evaluated using the compression test. The results of mechanical strength have been compared to Gibson and Ashby model. This paper proposes an adaptation of this model to explain the results.

Secondary Structures and Mechanical Properties of Biomimetic Protein Polymers

2009 ◽  
Author(s):  
Weibing Teng ◽  
Joseph Cappello ◽  
Xiaoyi Wu
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Half Life ◽  
Secondary Structures ◽  
Load Bearing ◽  
Protein Polymers ◽  
Human Arteries ◽  
Good Biocompatibility ◽  
Polypeptide Sequences

Silk may possess superior mechanical strength while its resilience is very poor. In contrast, elastin in human arteries is very soft but extremely durable with an estimated half-life of 70 years. By combing polypeptide sequences derived from native silk and elastin, we have produced a series of silk-elastin-like proteins (SELPs), which have displayed a set of outstanding properties such as good biocompatibility and controllable biodegradation rates [1]. In this study, we will examine the crystallization of the silk-like blocks and the crosslinking of the elastin-like blocks, as well as their influences on the mechanical behavior of SELPs. The ultimate goal of this study is to explore the potential of SELPs for applications in the engineering of load-bearing tissues such as arteries.

Porous Gradient Implant for Mandible and Craniofacial Surgery

2008 ◽  
Vol 396-398 ◽  
pp. 269-272
Author(s):  
E.S. Antunes ◽  
T. H. S. Sousa ◽  
C.A. Fortulan ◽  
Jonas Carvalho ◽  
B. de M. Purquerio
Keyword(s):  
Health Service ◽  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Castor Oil ◽  
Biological Interaction ◽  
Bone Reconstruction ◽  
Metallic Materials ◽  
High Mechanical Strength ◽  
Bioactive Material ◽  
Material Composite

Non metallic materials like polyurethane has been successfully used for bone reconstruction in general and specifically in craniofacial and in mandible surgeries as an implantable material. However, any polymer alone cannot be universally successful as a medical device or structural implant because the eventual lack of well defined porous geometry, inherent interconnected porosity, the non dispensable need for a combined mechanical behavior with biological interaction and manufacturing feasibility. In this work, a bioactive material composite with high mechanical strength was designed using a castor oil polyurethane (PU) structure with a functional gradient having a dense core and a porous bioactive surface. The models and replicas for the implants were processed with Rapid Prototyping (RP) techniques and their application (case studies) were fulfilled according to the SUS (Brazilian Health Service) with the support of Santa Tereza Hospital, Petropolis, RJ.

scholarly journals Analysis of the Relationship between Density and Mechanical Strength of Lightened Gypsums: Proposal for a Coefficient of Lightening

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Jaime Santa Cruz Astorqui ◽  
Mercedes del Río Merino ◽  
Paola Villoria Sáez ◽  
César Porras-Amores
Keyword(s):  
Compressive Strength ◽  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Strength Analysis ◽  
Construction Sector ◽  
Exponential Relationship ◽  
Good Adjustment ◽  
Gypsum Plaster ◽  
Polystyrene Waste ◽  
The Relationship

This article develops a relationship between the reduction of density in lightened gypsum and the addition of expanded and/or extruded polystyrene waste from the construction sector and their mechanical behavior. The equations determined in this study allow us to know the flexural and compressive strengths of a lightened gypsum/plaster compound once its density is known. The results show that there is an exponential relationship between the density of the compound and its strength. The methodology followed included a compilation of the results obtained in previous research works on lightweight gypsums, analyzing the relationship between density and mechanical strength and comparing them with the equations developed in this research. The results obtained by previous researchers have a good adjustment with the proposed models, and only perlite compounds present greater deviations in the compressive strength analysis. Also, a dimensionless lightening coefficient is defined which can help to determine the best application for a lightweight gypsum compound, comparing it with an ideal lightweight gypsum.

scholarly journals Correction to: Enhanced mechanical strength of talc-containing porous kaolin prepared by a replica method

2020 ◽  
Vol 57 (6) ◽  
pp. 708-708
Author(s):  
Sujin Lee ◽  
Jang-Hoon Ha ◽  
Jongman Lee ◽  
In-Hyuck Song
Keyword(s):  
Mechanical Strength ◽  
Replica Method

Effect of recycled coarse aggregate on physical and mechanical properties of concrete

2020 ◽  
pp. 136943322096379
Author(s):  
Ahmed A Elansary ◽  
Mostafa M Ashmawy ◽  
Hany A Abdalla
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Compression Test ◽  
Coarse Aggregate ◽  
Physical And Mechanical Properties ◽  
Economic Benefits ◽  
Test Protocol ◽  
Rc Structures ◽  
Recycled Coarse Aggregate ◽  
Failure Loads

Recycling of building waste has become essential process in the construction industry due to the sustainability and economic benefits such as decreasing the waste to landfill, conserving natural resources, and reducing pollution. Large amount of building waste is produced from the construction and demolition process of reinforced concrete (RC) structures. In this paper, the effect of using recycled coarse aggregate (RCA) on the behavior of concrete is experimentally studied. The RCA is prepared by crushing and sieving of waste of standard compression test cubes having a compressive strength ranging between 25 MPa and 30 MPa. The physical and mechanical properties of RCA are experimentally estimated and compared to those of natural coarse aggregate (NCA). A set of 72 standard concrete cubes, cylinders, and beams specimens are made using coarse aggregate replacement ratios (CARR) of 0%, 30%, 50%, and 100%. The specimens are tested to estimate the compressive, splitting, and flexure strengthens at the ages of 7 and 28 days. The study is extended by using the RCA in casting 12 RC columns with CARR similar to those of specimens. The columns are tested in an axial compression test protocol till failure. Crack patterns, failure loads, strains, displacements, and toughness of the tested columns are compared. It is concluded that using a CARR of 30% and 50% and a specific water cement ratio provides better mechanical behavior than that of NCA while the CARR of 100% yields worst mechanical behavior compared to that of NCA.

scholarly journals Effect of cement fineness and polycarboxylate dosage on the rheological and mechanical behavior of a mortar

2018 ◽  
Vol 149 ◽  
pp. 01037
Author(s):  
Didouche Zahia ◽  
Ezziane Karim
Keyword(s):  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Rheological Behavior ◽  
Organic Additives

The use of certain organic additives in the production of mortar and concrete influences the workability and the hydration kinetic of mortar. This results in a modification of some properties, namely rheological behavior and mechanical strength. The objective of this work is to evaluate the rheological and mechanical behavior of a mortar by varying the fineness of the cement and using the superplasticizer Polycarboxylate.

scholarly journals Effect of Extrusion Temperature on the Microstructure and Mechanical Properties of SiCnw/2024Al Composite

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2769
Author(s):  
Shanliang Dong ◽  
Bin Zhang ◽  
Yuli Zhan ◽  
Xin Liu ◽  
Ling Xin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Average Length ◽  
Research Work ◽  
Extrusion Temperature ◽  
Sic Nanowires ◽  
Peak Aged ◽  
Higher Temperature

In the present research work, the effect of extrusion temperature from 480 to 560 °C on the microstructure and mechanical behavior of the SiCnw/2024Al composite (15 vol.%) has been explored. It has been found that extrusion at higher temperature (above 520 °C) was beneficial for the densification of the composite, while the residual average length and alignment of the SiC nanowires were also increased with the extrusion temperature. Moreover, higher extrusion temperature was helpful for the mechanical strength of the SiCnw/2024Al composite, and the peak-aged SiCnw/2024Al composite extruded at 560 °C revealed the highest strength (709.4 MPa) and elastic modulus (109.8 GPa).

Mechanical behavior and damage mechanism of loaded coal and rock

2017 ◽  
Vol 14 (3) ◽  
pp. 200-207 ◽  
Author(s):  
Feng Luo ◽  
Guodong Li ◽  
Hao Zhang
Keyword(s):  
Mechanical Behavior ◽  
Uniaxial Compression ◽  
Axial Compression ◽  
Compression Test ◽  
Growth Stage ◽  
Shear Failure ◽  
Failure Process ◽  
Damage Mechanism ◽  
Uniaxial Compression Test ◽  
Content Type

Purpose The purpose of this paper is to obtain the mechanical behavior and damage mechanism of the coal and rock near the stope under the stress state and stress paths of the surrounding rock with the dynamic mining. Design/methodology/approach Through the three-axial compression test and the uniaxial compression test by meso experiment device, the mechanical behavior and fracture evolution process of coal and rock were studied, and the acoustic emission (AE) characteristics under uniaxial compression of the coal and rock were contrasted. Findings Under the three-axial compression, the strength of coal and rock enhance significantly by confining pressure. The volume of outburst coal shows obvious stages: compression is followed by expansion. The coal first appear to undergo compaction under vertical stress due to volume decrease, but with the development of micro- and macro-cracks, the specimens appeared to expand; under the uniaxial compression, through the comparison of stress–strain relationship and the crack propagation process, stress drop and fracture of coal have obvious correlation. The destruction of coal was gradual due to the slow and steady accumulation of internal damage. Due to the influence of the end effect, the specimens show the “conjugate double shear failure”. The failure process of the coal and rock and the characteristics of the AEs have a corresponding relationship: the failure causes a large number of AE events. Before the events peak, there was an initial stage, calm growth stage and explosive growth stage. There were some differences between the rock and coal in the characteristics of the AE. Originality/value These research studies are conducted to provide guidance on the basis of mine disaster prevention and control.

scholarly journals Alternative Liquid Assisted-Sintering of AL/CU Composites Using Selective Powders of AS-Cast Al-ZN Alloy

2022 ◽  
Author(s):  
Eder Lopes Ortiz ◽  
Wislei Riuper Osório ◽  
Ausdinir Danilo Bortolozo ◽  
Giovana da Silva Padilha
Keyword(s):  
Mechanical Properties ◽  
Energy Consumption ◽  
Powder Metallurgy ◽  
Aluminum Alloys ◽  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Initial Powder ◽  
Wide Range ◽  
Reduction Of Energy Consumption ◽  
Zn Alloy

Abstract Al and its alloys constitute one of the most versatile, economical and attractive materials for a wide range of applications. The 7xxx and 2xxx series alloys are those of achieving the highest mechanical strength among aluminum alloys. In this investigation, using powder metallurgy provides the microstructural and mechanical properties characterizations of non-commercial Al6Cu5Zn alloy by using powder metallurgy. Initial powder sizes are determined and the best condition is obtained for the distribution comprised between 75-106 μm. The samples are sintered at 585 oC, 600 oC and 615 oC during 0.5, 1.5 h and 3 h. It is found that mechanical behavior similar to as-cast Al-Cu based alloys is attained (~ 125 MPa) when the samples at 615 oC during 3 h are sintered. Considering the reduction of energy consumption and metal fumes commonly produced in foundry, Al-Zn powder can be used with Al and Cu elemental powders to constitute an Al6Cu5Zn alloy.

scholarly journals Experimental studies on the mechanical behavior of Mayan archeological rocks

DYNA ◽  
2019 ◽  
Vol 86 (208) ◽  
pp. 227-233
Author(s):  
Carlos Rolando Rios Soberanis ◽  
Victor Jose Ley Paredes ◽  
Emilio Perez Pacheco ◽  
Carlos Emilio Vinajera Reyna ◽  
Shuichi Wakayama ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Mechanical Characteristics ◽  
Experimental Studies ◽  
Structural Performance ◽  
Mechanical Loads ◽  
Bending Tests ◽  
Layer Orientation ◽  
The Subject ◽  
Formed Part ◽  
Architectural Research

Mayan buildings have been the subject of significant archaeological and architectural research; however, so far there have been no relevant references concerning structural or mechanical behavior. Ancient Mayan constructors used calcareous rocks to build temples and housing that were placed systematically to withstand mechanical loads in the structures. This paper studies the mineralogical and mechanical characteristics of calcareous stony material that formed part of Mayan archeological vestiges in Yucatan area. The orientation of the rocks´ geological strata was taken into account to study mechanical behavior from cylindrical cores in compressing test. On the other hand, bars were also manufactured to simulate lintel or architrave structural performance. Compression and bending tests confirmed a high influence of the geological layer orientation, since the mechanical properties of such rocks were found to vary with direction. Acoustic emission was used to provide information referring to onset and propagation of damage in cylinder and bar samples.

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