Mechanical Property Data for Coated Systems-The Prospects for Measuring “Coating Only” Properties using Nanoindentation

1996 ◽  
Vol 436 ◽  
Author(s):  
S. V. Hainsworth ◽  
T. F. Page
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Applied Load ◽  
Careful Analysis ◽  
The Other ◽  
Contact Deformation ◽  
Property Data ◽  
Experimental Tool ◽  
The Relationship ◽  
Critical Aspects

AbstractOne of the critical aspects of assessing the properties of coated systems is the prospect of being able to measure the properties of the coating in isolation of the substrate. This has led to an increase in the use of continuously-recording indentation techniques (or nanoindentation techniques) for assessing the mechanical properties of coated systems since they can be used to measure the materials response to contact deformation at a scale relevant to the coating thickness. This paper presents the results of a new method for analysing the nanoindentation loading curves for coated systems. The analysis of the loading curve uses the relationship P = Kmδ2 which describes the indenter displacement, δ, in terms of the applied load P. For each material, Km can be predicted from its modulus E and hardness H. One result is that if either of E or H is known, then the other may be calculated from the experimental loading curve. Further, the method has the potential to differentiate between the responses of the coating only, the coating and substrate in combination, and that dominated by the substrate once the load has become sufficient for cracking of the coating such that it no longer plays a significant role in supporting the applied load. In many cases, careful analysis of the loading curves allows the displacement ranges associated with these regimes to be identified. This is shown to be a powerful experimental tool for the interpretation of the mechanical properties of coated systems.

Study on the Relationship between Microscopic Structure and Mechanical Properties of HTPB Propellant

2010 ◽  
Vol 152-153 ◽  
pp. 1151-1155 ◽  
Author(s):  
Xu Chang Li ◽  
Jian Jiao ◽  
Jun Yan Yao ◽  
Liang Wang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Cross Section ◽  
Structural Integrity ◽  
Solid Particles ◽  
Microscopic Structure ◽  
Structure State ◽  
Htpb Propellant ◽  
The Relationship ◽  
Bond Effect

By means of a tensile instrument and SEM, the mechanical property parameters of HTPB propellant test samples with different formulas were tested, and their microscopic fracture cross section patterns were observed. Take advantage of these testing results, the relationship between microscopic structure and mechanical properties of HTPB propellant was studied. The results show that the mechanical properties of a propellant are closely related to its microscpic structure state. The structural integrity of propellant is mainly influenced by the bond effect of the interface between binder and solid particles, solid particle’s shape, size and its distribution, the content of binder matrix, etc. These factors have important effects on the mechanical properties of propellant.

Mechanical Properties Of Quasicrystal Dispersed Al-Li-Cu Alloy

1998 ◽  
Vol 553 ◽  
Author(s):  
T. Okada ◽  
T. Nakamura ◽  
K Mitsugi ◽  
K Kozawa ◽  
T Matumura ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Vickers Hardness ◽  
The Other ◽  
Proof Stress ◽  
Specific Strength ◽  
Cu Alloy ◽  
Ti Alloys ◽  
Maximum Value ◽  
The Relationship

AbstractTo apply the ductile structural materials, the quasicrystal dispersion in aluminum alloys is one of effective methods. We have investigated mechanical properties of quasicrystal dispersed Al- Li-Cu alloy prepared by the twin-type piston anvil apparatus. The slow cooled samples are hard and ductile. The evaluated values of brittleness are from 6.0 to 14 erg for Ef, from 0.52 to 0.73MNm−3/2 for K1c and from 5.5 to 7.7 Nm−1 for Gic for the fastest and slowest cooled samples, respectively. The hardness of the quasicrystal dispersed Al-Li-Cu alloy is higher than that of the other commercial aluminum alloys. Based on the relationship between Vickers hardness and proof stress of aluminum alloys, we estimate the specific strength of Al-Li-Cu quasicrystal alloy. The maximum value is the higher than that of Ti alloys.

Finite Element Analysis of the Bionic Tissue Engineering Scaffold for the Defect Cranium

2012 ◽  
Vol 184-185 ◽  
pp. 222-226
Author(s):  
Fan Fen Peng ◽  
Shu Xian Zheng ◽  
Jia Li
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Tissue Engineering ◽  
Finite Element Analysis ◽  
Tissue Engineering Scaffold ◽  
Element Analysis ◽  
Engineering Technology ◽  
Bionic Scaffold ◽  
Bottle Neck ◽  
The Relationship

The relationship between the porosity and the mechanical property was still a bottle-neck in bone tissue engineering scaffold. Porosity increasing may reduce the scaffold strength. In order to solve the contradiction, the idea of enhancing the mechanical properties by controlling the scaffold porosity was proposed in this paper. Using reverse engineering technology, 5 different porosity cranium scaffolds were first established. Their FE models were built through FE surface preprocessing and volume fitted meshing. According to results of static analysis, the displacements and stresses of the 5 porosity scaffolds were compared and discussed and it indicated that the 36% porosity bionic scaffold have good porous level and mechanical properties.

scholarly journals Joining Alumina and Sapphire by Growing Aluminium Borate Whiskers In-Situ, and the Whiskers’ Orientation Relationship with the Sapphire Substrate

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 175 ◽  
Author(s):  
Chun Li ◽  
Xiaoqing Si ◽  
Shuang Wu ◽  
Junlei Qi ◽  
Yongxian Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Orientation Relationship ◽  
Sapphire Substrate ◽  
Great Influence ◽  
The Other ◽  
Aluminium Borate ◽  
Random Growth ◽  
The Relationship ◽  
Scanning Electron

Bonding between polycrystal alumina and sapphire with (0001), (10 1 ¯ 0), (11 2 ¯ 0), (1 1 ¯ 02) orientations is successfully achieved by growing aluminium borate whiskers in the joint. The morphology of the whiskers in the joint is characterised by (Scanning Electron Microscopy) SEM. The relationship between the growing direction of the aluminium borate whiskers and the orientation of the sapphire substrate is investigated. The effect of the growing direction of the aluminium borate whiskers on the mechanical properties of the joint is discussed. The results show that the whiskers on the sapphire with (10 1 ¯ 0) orientation grow perpendicular to the surface of the substrate while the whiskers show a random growth on the other substrates. It is found that there is an orientation relationship between the whiskers (220) and sapphire (10 1 ¯ 0) and the morphology of the whiskers has great influence on the mechanical properties of the joint. The joint between polycrystal alumina and sapphire with (10 1 ¯ 0) orientation exhibits the highest strength, which reaches 26 MPa.

Investigation of High Temperature Mechanical Properties for Improved Finite Element Analysis Simulations of Forged Railroad Wheels

2005 ◽  
Author(s):  
Steven Dedmon ◽  
James Pilch ◽  
Cameron Lonsdale
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Finite Element Analysis ◽  
Finite Element ◽  
High Temperature ◽  
Element Analysis ◽  
Property Data ◽  
High Temperature Mechanical Property ◽  
Class C ◽  
Mechanical Property Data

Finite element analysis (FEA) programs depend on accurate evaluation of mechanical and physical properties for determination of thermo-mechanical characteristics of wheel designs. For wheel residual stress analyses, both property types are equally important. Also important is knowledge of the anisotropy of properties in a design. For this paper, the authors tested AAR M107/M208 Class “C” steel ingot material and an as-forged (but untreated) wheel. The information presented includes elevated temperature mechanical properties of ingot material taken in circumferential, radial and axial orientations at two depth positions. High temperature mechanical property data (not currently found in the literature beyond 1800F) is also included for the ingot steel. Untreated as-forged AAR Class “C” material mechanical properties were evaluated at temperatures up to 2000F, and at the rim, plate and hub locations. High temperature mechanical property data for heat treated micro-alloy AAR Class “C” wheels are also presented.

Effect of Reheating Process on Microstructure and Mechanical Property of A390 Aluminum Alloy

2015 ◽  
Vol 817 ◽  
pp. 173-179 ◽  
Author(s):  
Xue Kong ◽  
Bi Cheng Yang ◽  
Zhi Feng Zhang ◽  
Jun Xu
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Aluminum Alloy ◽  
Evolution Mechanism ◽  
Primary Si ◽  
Maximum Value ◽  
Eutectic Si ◽  
Reheating Process ◽  
The Relationship ◽  
Microstructure And Mechanical Property

The effect of reheating process on the microstructure and mechanical property of A390 aluminum alloy and its evolution mechanism was studied. During reheating process, the microstructure of A390 ingots changed greatly, the microstructure ofα-Al particles changed from dendrite to spherical. As the reheating temperature increased primary Si and eutectic Si gradually grew up and spheroidized while the mechanical properties got the maximum value as the ingot reheating to 540°C. The relationship the between reheating power and microstructure was built. Improving reheating power can restrain the growth of grains, but if the reheating power was too high, the microstructure becomes non-uniform. It has been found that reheating of A390 aluminum alloy experiences two processes of grain combination and Ostwald growing.

Research for the Influence of Canopy Mesh Fabric Perforation Structure on its Mechanical Properties

2011 ◽  
Vol 411 ◽  
pp. 518-522
Author(s):  
Shao Hui Tian ◽  
Zhi Yi Hu ◽  
Hong Shu Chen
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Mechanical Strength ◽  
Fabric Density ◽  
Fabric Structure ◽  
Strength Tests ◽  
Distribution Parameters ◽  
Mesh Layout ◽  
Fabric Mesh ◽  
The Relationship

Under the circumstance of the same parameters as fabric density, yarn type and so on, different fancy openwork could be weaved respectively in which the fabric mesh layout are various. Then in order to get the fabric pore size distribution parameters under the best mechanical strength, the different fancy openwork should be applied in tensile and tear strength tests, which can contribute to analyze the relationship between mesh fabric structure and its mechanical property.

scholarly journals Relationships among wood anatomy, hydraulic conductivity, density and shear parallel to the grain in the wood of 24-year-old Handroanthus vellosoi (Bignoniaceae)

Rodriguésia ◽  
2017 ◽  
Vol 68 (4) ◽  
pp. 1217-1224
Author(s):  
Eduardo Luiz Longui ◽  
Ivanka Rosada de Oliveira ◽  
Ryan Combs Graebner ◽  
Miguel Luiz Menezes Freitas ◽  
Sandra Monteiro Borges Florsheim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydraulic Conductivity ◽  
Water Transport ◽  
Wood Anatomy ◽  
The Other ◽  
Mechanical Resistance ◽  
Water Conductivity ◽  
Trade Offs ◽  
Thick Disks ◽  
The Relationship

Abstract We studied the relationships among wood anatomy, hydraulic conductivity, density and shear parallel to the grain in the stem of Handroanthus vellosoi trees with the goal to identify possible trade-offs between hydraulic conductivity and mechanical properties. For this study we felled 12 trees with 24-year-old and cut 10-cm-thick disks at three heights: base of the trunk, one meter in height, and two meters in height. We propose that the relationship between hydraulic conductivity and mechanical resistance found along the H. vellosoi trunk indicates greater mechanical investment in the wood at the base of the trunk compared with the other two heights (1 and 2 meters). Anatomically, this would be represented by smaller diameter vessels and fibers with thicker walls. Consequently, strength investment implies lower water conductivity at the stem base. However, more studies are needed to determine whether this lower value with respect to 1 and 2 meters represents a significant effect on water transport along the stem.

Study on Pore Structure Characterization of Concrete at Different Ages by Thermoporometry

2013 ◽  
Vol 539 ◽  
pp. 178-183 ◽  
Author(s):  
Zheng Wu Jiang ◽  
Zi Long Deng ◽  
Nan Zhang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
High Strength Concrete ◽  
High Strength ◽  
Structure Characterization ◽  
Strength Concrete ◽  
20 Nm ◽  
The Relationship ◽  
Curing Age

In this paper, pore structures and their changes of ordinary-strength concrete and high-strength concrete at different curing ages of 3, 28, 90 days were studied using thermoporometry, and the results were compared with those from MIP and NAD. The relationship between micro pores and porosity of concrete and its macroscopic properties was also studied. The results indicate that, compared to MIP, thermoporometry can characterize the features of pores with the diameter smaller than 100 nm in concrete accurately. The differences of macroscopic mechanical properties of concretes can be explained using the changes of their pore size distribution. After curing age of 28 days, the amount of pores with the diameter higher than 20 nm in high strength concrete changes little, but it decreases gradually in ordinary strength concrete. And pores with diameter smaller than 20 nm in concrete have little influence on the macroscopic mechanical property of concrete.

Microstructure/Property Examination of Weld HAZ in Grade 100 Microalloyed Steel

2002 ◽  
Author(s):  
K. Poorhaydari ◽  
B. M. Patchett ◽  
D. G. Ivey
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Filler Metal ◽  
Microalloyed Steel ◽  
Welding Process ◽  
Grain Structure ◽  
Property Variation ◽  
Weld Thermal Cycle ◽  
Transmission Electron ◽  
The Relationship

The weld thermal cycle in microalloyed pipeline and structural steels results in significant changes in microstructure and, consequently, mechanical properties of the weld heat-affected zone (HAZ). To have better control of the properties of the HAZ, knowledge of these changes and correlation with mechanical property variations is required. The first step in achieving this is to construct a methodology to examine different regions of the HAZ thoroughly, so that important characteristics such as grain size, microstructure, precipitate type and distribution, and mechanical properties are determined. The next step would be using this methodology to examine different regions of the HAZ under different welding conditions (the most important of which is heat input) and therefore to understand the effects of the welding process. In this paper, a methodology for studying HAZ microstructure/property relationships is demonstrated for a Grade 100 microalloyed steel welded autogenously (no filler metal). Microhardness measurements are used to assess the mechanical property variation across the HAZ. Optical microscopy (OM) and transmission electron microscopy (TEM) are used for grain structure examination and precipitate analysis. The relationship between microstructure and mechanical properties, with emphasis on precipitate reactions, is presented for different regions of the HAZ.

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