processing excavated materials in the laboratory
Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 2 doc
Ngày tải lên :
11/08/2014, 15:20
... cross-link the chains, forming a molecular network These cross-links are crucial in determining the mechanical properties of the polymer because they fix the chains relative to each other and thus ... adding the thermal energy to the energy in the minimum of the potential well as sketched in figure 2.14 Because the repulsive interaction is shorter-ranged than the attractive interaction, the ... materials One example are turbine blades containing very long grains oriented in the longitudinal direction of the blade (see figure 2.12) Why this is done is explained in the next section • The...
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Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 4 docx
Ngày tải lên :
11/08/2014, 15:20
... selected Next, the intersection with the vertical line at the correct ratio d/D is determined The value of Kt can be read off at the ordinate The cross marks the example point discussed in the text ... loading direction and the 32 In the region of the crack, the specimen is a ring, only On the outer and inner surface of this ring, there can be no radial stresses, thus the radial stresses within ... than in the un-notched case This is again due to the triaxial stress state and can be explained in the same way as for the onset of yielding above It has to be kept in mind that the diameter of the...
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Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 5 doc
Ngày tải lên :
11/08/2014, 15:20
... region near the crack tip is, the steeper is the line characterising the formation of the stretch zone In the limiting case of linear-elastic material behaviour, the line is vertical and the curve ... a W − 5.6 a W is the geometry factor In calculating KI , it is important to note that the crack length a is measured from the point of loading, not from the beginning of the initial crack This ... back to the starting point The vector describing this step is the Burgers vector b As long as the Burgers circuit encloses the dislocation line, the Burgers vector defined in this way is independent...
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Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 6 ppt
Ngày tải lên :
11/08/2014, 15:20
... the other hand diusion is faster there, increasing the size of the depleted region compared to the inside of the grain Both eects increase the corrosion-sensitivity of the areas adjacent to the ... mechanical twinning 225 6.5 Mechanical twinning Fig 6.56 Deformation twins in ferritic steel The twinning planes can be observed as lines within the grains, some marked by arrows and the rotation ... phase the particles must be larger than that of the matrix In this case, there are further strengthening eects, discussed in the following To discuss these eects in detail, we consider the example...
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Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 7 pptx
Ngày tải lên :
11/08/2014, 15:20
... covalent bonds linking the chains are also relevant In the following, we will start by discussing the elastic properties of thermoplastics and afterwards study the in uence of cross-linking ... for strengthening ceramics There are two approaches: In the first, we try to reduce the size of defects or initial cracks in the material, thus increasing the critical stress according to equation ... large The size of the region in which the necessary stress is reached is proportional to the grain size Therefore, the transformation can occur during cooling in large grains, but not in small...
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Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 8 pot
Ngày tải lên :
11/08/2014, 15:20
... stresses occur near the ends of the fibre at the fibre-matrix interface, increasing the strain in this region The strain in the matrix of a composite is thus larger than the strain in the fibre and is ... Because the fibre resists the strain more strongly than the matrix, the strain in the matrix increases accordingly This has two consequences: On the one hand, the strain in the matrix to the left ... drawn from the melt, the molecules in the fibres orient themselves in the drawing direction.9 Especially important in determining the crystallinity of a polymer is the tacticity, the way the side...
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Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 9 pot
Ngày tải lên :
11/08/2014, 15:20
... because the fibres impede this If shear occurs in the direction of the fibres, either the matrix itself can shear between the fibres or there may be shearing along the interface The strengthening effect ... to the matrix material alone because strains in the matrix increase and the stress state is triaxial The shear stress at the interface between fibre and matrix locally increases the strain in the ... cooling from the processing temperature Especially problematic is the case of the coefficient of thermal expansion of the matrix being larger than that of the fibre, for the matrix will then shrink...
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Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 10 pptx
Ngày tải lên :
11/08/2014, 15:20
... that the amount of plastic deformation is small The total strain thus corresponds mainly to the elastic part of the strain The line can be described using the Basquin equation, re-written with the ... The fact that a stress gradient at the surface increases the strength of a component can also be seen in bending In bending, the stress decreases linearly with the distance from the surface The ... because the crack propagates on the glassy phase of the grain boundaries (see section 7.5.2), resulting in crack bridging effects as explained in section 10.3 However, the effect is rather small The...
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Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 11 pptx
Ngày tải lên :
11/08/2014, 15:20
... strain and explain the meaning of the parameter δ! b) Write the stress as a function of the strain! Use an addition theorem to split the stress into two components, one in- phase with the strain, ... diffusion processes in which the material increases its length in the direction of the tensile stress by moving atoms from 11.4 Increasing the creep resistance 401 ¾ ¾ ¾ grain grain ) grain ¾ ¾ ¾ (a) ... molybdenum in the steel 13 CrMo 4-4 significantly increases the creep resistance Raising the chromium or molybdenum content further and adding vanadium strengthens the effect Strengthening is, on the...
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Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 12 potx
Ngày tải lên :
11/08/2014, 15:20
... numbers They are determined in the following way: Choose the origin of the coordinate at any point not in the plane considered Determine the intersections m, n, and p of the plane with the coordinate ... line through the origin of the coordinate system The coordinates describing the line are called the indices and written with square brackets: [hkl] They result from the intersection of the line ... connection of the elements, the strain ε is the same in both of them The stress σS (t) in the spring and σD (t) in the dashpot element are σ = σS (t) + σD (t) The strain rate in the dashpot element is...
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Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 13 docx
Ngày tải lên :
11/08/2014, 15:20
... for the singularity near the crack tip The smaller the exponent n becomes, the stronger is the singularity in the strain and the weaker is the singularity in the stress What is the role of the ... and ends at the other In principle, the contour has to be closed but because there is no material within the crack, the energymomentum tensor vanishes there Since the crack is in the x1 direction, ... shift the interface in direction by a distance dx1 The same interpretation is valid for the other two J integrals: If we shift the interface in the or direction, nothing changes, and the energy...
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Tài liệu What Lung Cancer Patients Need to Know About Bone Health: A Publication of The Bone and Cancer Foundation pdf
Ngày tải lên :
15/02/2014, 05:20
... of the skeleton, tumor cells most often affect the bones that have the greatest blood supply These include the ends of the arms and legs (nearest the torso), the pelvis, the ribs, and the spine ... lung cancer are prone to bone thinning in their vertebra because the radiation used to treat the lungs can affect the spine • Pressure on the nerves of the spine caused by compression fractures ... at the site of the tumor • Pain medication Patients experiencing bone pain should be given pain medication This may include nonsteroidal anti-inflammatory drugs (NSAIDs) and/or drugs containing...
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Tài liệu Business risks facing mining and metals 2012–2013 pptx
Ngày tải lên :
18/02/2014, 00:20
... access The key in uences on infrastructure financing include: • The changing role of government to planning, approving and incentivizing financing of infrastructure • The rising number of foreign investors ... d’Ivoire’s mining code points to improvements in the investment climate for operators there in 2012 and 2013 Anti-mining sentiment in the early post-independence period and instability during the 1990s ... costly affair in comparison to traditional open pit mining So although the profits are there, the same margin is not being realized Mining and metals companies are increasingly investing in new regions...
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NICKEL AND THE SKIN Absorption, Immunology, Epidemiology, and Metallurgy pptx
Ngày tải lên :
06/03/2014, 09:21
... are included We are working with these goals in mind As the books become available, the efforts put in by the publisher, book editors, and the individual authors will contribute to the further ... Among the female cohort tested there in 1995, the practice of skin piercing was seen in 167 individuals (89%) In a cohort of over 4000 patients in Finnish patch-test clinics tested with the dental ... agents in the patient’s serum, or in vivo by the skinprick test, which assesses immediate-type allergy in the patient’s skin Particularly in the industrial setting, volatilization of metals and their...
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Weldability and metallurgy
Ngày tải lên :
12/03/2014, 17:21
... Treatment process to increase hardness is similar to the process occurring in welding Hardenability depends on several factors, such as Grain Size and Microstructure Deformation in crystals Temperature ... heated Rate of Cooling (CCT and TTT diagrams) Alloying elements Weldability and Metallurgy of Welding Welds Factors during welding Changes in temperature Changes in dimensions Growth ... Composition When the composition of filler is different from base metal there is a variation in composition across the weld (dilution also occurs) This combined with changes in cooling rates will...
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Báo cáo khóa học: Mutational and structural analysis of cobalt-containing nitrile hydratase on substrate and metal binding pdf
Ngày tải lên :
16/03/2014, 16:20
... tyrosine residue, are highlighted Triangles indicate residues involved in the formation of the substrate binding pocket Arrows indicate the residues that were mutated in this study Asterisks indicate ... accommodate the alkyl chain or aromatic ring of a nitrile substrate bTrp72 of the Co-type NHase from P thermophila replaces the tyrosine residue of Fe-type NHase, and the substrate binding pocket in the ... (Fig 5A) The distance between the Cc2 atom of aThr109 ˚ and the Cc1 atom of aVal136 is 3.7 A On the other hand, in Fe-type NHase, the side-chain of the corresponding serine residue does not interact...
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Bone and Joint Futures doc
Ngày tải lên :
29/03/2014, 17:20
... ageing individuals who would have lost their independence There have been major developments in preventing back pain becoming chronic There have been major advances in the management of pain Pain ... also increasing and a principal of healthcare reforms in the UK The important changes in the delivery of care are the increasing access of the public to advice through telemedicine and promoting ... be increasingly able to meet their individual information needs Ensuring the quality and appropriateness of this information will be the challenge There are also going to be major changes in the...
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MECHANICAL AND METALLURGICAL ANALYSIS OF STRUCTURAL STEEL pot
Ngày tải lên :
01/04/2014, 00:20
... portion of the building was found to have moved to the west as it tilted to the southeast During this tilting, a complex kink developed at the southeast corner of the top of the building, in the region ... farther inside the building, and is made up of four angle irons (a double truss) The red paint color being visible and the fact that the line between the angle iron can be seen indicated that the ... close-up of the kink area in the previous figure (southeast corner, WTC 2), with overlaid lines to highlight the details of the kink geometry The edge of the building (1) bends an angle to another direction...
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