Questions tagged [materials]
Use for questions about designing, manufacturing or synthesizing engineered materials or about the properties of specific materials. Questions concerning common construction materials, such as wood, steel or masonry do not need to use this tag; use the more specific tag instead.
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Does elastic deformation becomes plastic deformation, given sufficient time?
I'm confronted some aspects of Material Science I'm unfamiliar with.
In general, if a material is subjected to an elastic deformation for
too long, does that become a plastic deformation?
Does this ...
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Is there a table for the density, Young's modulus, and other common properties for the most common materials?
I've tried googling extensively, but I have not found a single table that contains many of the "common" materials and more than one property. Does anyone have a table from an engineering ...
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Does a fire retardant plastic exist that could be fabricated to appear as long, thin grass blades/reeds?
Does a cheap plastic material exists that can be fabricated to appear as long grass/reeds but is fire retardant and very durable and long-lasting when exposed to sunlight/weather? I'm basically ...
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What is the "damage threshold" for concentrated sunlight upon a mirror?
I am trying to determine the maximum $Watts/cm^2$ of concentrated sunlight -not lasers or laser pulses- that polished mirrors of various kinds can handle, -Aluminum vs Silver, say.
What equations are ...
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Creep of the materials
Does creep exists for all materials at any stress at room temperature? I searched for this and could not find any answer other than creep isn't significant at low stresses and low temperatures. What I ...
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Theoretically when a homogeneous isotropic bar is subjected to axial loading, does it fail in shear?
I m referrencing James M Gere, Timoshenko Mechanics of Materials Chapter 2 Page 106. The book talks about effect of uniaxial load on a small element that is inclined in one axis. So my question is if ...
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How to compute the resistance of this metallic part (steel angle iron), for a joist fitted in an I-profile beam?
Let's say we have an oak joist (15 cm x 15 cm x 370 cm), which is "fitted" in the profile of an I-profile beam (height 140 mm, width 66 mm), and the surface where the joist is laid is too ...
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Diffusor for uniform illumination
I have an LED with a beam angle of 120° and I need to illuminate an area in the shape of a circle with a radius of 3.5 mm.
My objectives are as follows:
Achieve a uniform illumination of the circle (...
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How to remove oxide layer around stainless steel welds with household items
I have a stainless steel pot whose welds show the formation of an oxide layer. Colors around those welds range from gold to dark blue (see images below). The main question is: How do I remove those ...
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How can I reduce noise from pushrods in an assembly without using grease/oil?
I have an assembly which consists of a row of vertically-oriented nylon pushrods (each 5/16" in diameter, colored green in the attached pictures), and two black pieces of laser cut delrin ...
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What is the easiest way to cut ~1000 steel rods - each one 1.5mm in diameter and 12" long - into ~6000 rods that are each 1.75" long?
Any ideas for tools and/or jigs that would be best to use for this?
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What determines the rate of electron discharge machining (EDM) for different materials?
Wire EDM makes no contact with the work piece and disregards hardness.
I am using EDM to cut different materials, and I notice a clear distinction between the rate each material gets cut. For example, ...
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What grade of steel best suits this application?
Take a long, thin, straight wire with a circular cross section. Say, .5mm in diameter and 200mm in length. Hold the wire horizontally at one end (cantilever). What grade of steel would result in the ...
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How much can I heat a spring before it changes characteristics?
I painted some “spring-tempered steel” stock with exhaust clear paint. The paint needs to be baked on. How much can I heat the springs till it becomes a problem?
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What material performs best in this situation?
Take a long, thin rod, say .25 mm in diameter and 200 mm in length.
Filling these fixed dimensions, what kinds of materials could the rod be made of such that it minimizes how much the rod bends under ...
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