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Why would metals behave as brittle materials without dislocations?
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∙ 12y ago
i dont know jiij
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∙ 12y ago
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A
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How are oceanic crust and continental crust similar?
They both behave as brittle solids and are both formed of a mixture of igneous, metamorphic and sedimentary rocks.
Behavioral adaptation example?
Zebras learn to behave in the wilderness without adult supervision.
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Magnets are made from magnetic materials. These are metals that can be magnetised or will be attracted to a magnet. Most materials are not magnetic, but iron, cobalt and nickelare magnetic. Steel is mostly iron, so steel is magnetic too.
How do brittle and ductile materials differ in their behaviour in a compression test?
(a) Ductile materials: For ductile material such as mild steel, the load Vs compression diagram would be as follows(1) The ductile materials such as steel, Aluminum, and copper have stress - strain diagrams similar to ones which we have for tensile test, there would be an elastic range which is then followed by a plastic region.(2) The ductile materials (steel, Aluminum, copper) proportional limits in compression test are very much close to those in tension.(3) In tension test, a specimen is being stretched, necking may occur, and ultimately fracture fakes place. On the other hand when a small specimen of the ductile material is compressed, it begins to bulge on sides and becomes barrel shaped as shown in the figure above. With increasing load, the specimen is flattened out, thus offering increased resistance to further shortening ( which means that the stress - strains curve goes upward ) this effect is indicated in the diagram.Brittle materials ( in compression test )Brittle materials in compression typically have an initial linear region followed by a region in which the shortening increases at a higher rate than does the load. Thus, the compression stress - strain diagram has a shape that is similar to the shape of the tensile diagram.However, brittle materials usually reach much higher ultimate stresses in compression than in tension.For cast iron, the shape may be like thisBrittle materials in compression behave elastically up to certain load, and then fail suddenly by splitting or by craking in the way as shown in figure. The brittle fracture is performed by separation and is not accompanied by noticeable plastic deformation.
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A class without a teacher is just like a nation without laws wherein every irresponsible ones will behave as they like and enguage themselves in things that may disturb the inocent ones
