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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Need to know tolerance of certain rubbers to pH 11 Bases
I need to know whether neoprene and HNBR (Hydrogenated Nitrile Butadiene Rubber) seals can tolerate pH11 atmosphere. The seals would be in touch with a fertilizer which is pH11.
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Which formula to use to calculate the main vibratory frequencies of a wooden joist floor? (8 Hz?)
When a wooden floor joist is a little undersized, there is a vibration phenomenon when walking on the floor.
In some forums, I've often seen a frequency of 8 Hz mentioned when walking on the floor, ...
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What materials where used in this study or ones that would make the most sense please!
I understand that they used two different materials and combined them through fiber drawing process but I don’t truly understand which materials were used. Here is where it is mentioned in the article....
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What would be the best capacitor to use for a railgun that uses a capacitor as the projectile?
I have had a long-time interest and fascination with railgun technology and for a long time I have wanted to build a small-scale, simple railgun as a scientific experiment. This railgun is designed to ...
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Price of e-beam evaporator [closed]
I'm trying to find an accurate price estimate for an electron beam evaporator for a research project. The intended application is for use in large-scale manufacturing.
How does one usually go about ...
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Failing engine A-Mount (bad design by the automotive manufacturer?)
I currently own a Tata Nexon Petrol car (in India) where I have seen (on facebook, Telegram, WhatsApp owner groups and youtube) that the A-Mount on the engine has suffered multiple failures for some ...
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Material suited for fixing leakage in liquid nitrogen dewar
I need to fix a leak on the inside of a liquid nitrogen dewar which acts as the coolant tank for a spectroscopy CCD camera. Due to the design of the camera, I unfortunately can only access the inside ...
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Lubricants for dissimilar metals
We are trying to maintain a Grubb telescope built in 1875. We think that the bearing surfaces are either brass to brass or brass to cast iron. Can anyone help with types of lubricants that could be ...
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Plane strain delamination on bilayer material (conversion from material stress state to residual force and moment)
I have been reading the book The Mechanics and Reliability of Films, Multilayers and Coatings (https://doi.org/10.1017/9781316443606) on chapter 4.2 and got stuck in chapter 4.2 and 4.3.
Suppose that ...
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Tolerances in the manufacture of mechanical parts (plastic)
It is necessary to make an adapter ring for connecting the smartphone to the microscope eyepiece (turn from ABS on a lathe, or 3D printing). Microscope eyepiece diameter is 33mm.
What should be the ...
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How is fuzzy velvet-like surface on plastic achieved?
This kind:
It's a very thin layer of very short (<1mm) hairs, coating a hard plastic underneath. I encounter this sort of lining on some mid-tier electronics that pretend to be more classy than ...
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How can I calculate the maximum center load on a horizontal cellular glass tile; supported along its edges, before it breaks?
Insulating cellular glass boards or tiles are designed to sit on a flat load-bearing surface. I want to consider the situation where the base is concave so the tile is only supported on its edges. I ...
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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 air entrainment in the context of cement mortars and how is it achieved?
What is air entrainment in the context of cement mortars and how is it achieved?
I'm not an engineer but I would like to get a rudimentary understanding of the mechanism whereby tiny bubbles of air ...
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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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Steel to aluminum structural equivalent
I am trying to build an aluminum trailer on an airbag suspension. The plans are for a steel frame and we are looking to construct it out of aluminum to save weight due to towing limitations. Not sure ...
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How do I figure out what proportion of ferric chloride I use for etching 304 & 316 stainless steel?
I am trying to etch a Damascus ring (cold rolled 304 & 316 stainless) however I keep getting pits or a terribly light etch. So far I've tried:
415 chloric ferride with
1 to 3 water solution for ...
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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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How to determine the performance index M for the outer vessel of a vacuum bottle? Need help with objective and constraint selection (Ashby diagrams)
I'm reaching out for assistance and advice regarding a problem I'm encountering in my thermal bottle analysis. I have been attempting to determine the performance index M but facing significant ...
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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 to synthesize alloys or new materials on a small scale?
At the lab scale, alloys or intermetallic compounds are synthesized in an arc melting furnace or by induction melting. The quantity produced is about 5 to 10 grams at minimum. My question is, what if ...
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Flexural strength of 1x1 aluminum
Trying to build a rather odd tool box that will sit on the bed side of my truck and sue to a swinging arm with a pneumatic shock assist will lower and swing it outward till it hits a rubber stopper ...
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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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Materials that will block water but allow sound to travel through without being muffled
I am in a fraternity at my college. We would like to host a paint party but are worried about our speakers getting damaged. The paint used is water based, so very thin. The paint is made using ...
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What are good insulators aside from glass?
The insulation properties of glass is apparently a factor in its popularity in modern construction.
Natural stone, by contrast, is a poor heat insulator.
What are some other building materials, i.e. ...
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Potential Problems of Excessively Hard Shaft
Will there be any issues if we make the shaft too hard?
Hardness being a surface property may prevent surface scratches and wear, could it lead to any problems in general?
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Why the size of top and bottom rollers is different in three point bend test?
In a short beam shear testing of polymers, the configuration is such that the top (loading) roller is bigger than the bottom (support) rollers. Why is this the case, and what happens when the size of ...
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Is there an electrical analogue to mechanical fatigue with respect to dielectric strength?
Suppose I have an elastomeric specimen from a material sample known to have dielectric strength of, say, 15 kV/mm, as informed by previous dielectric strength testing. If I were to repeatedly subject ...
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What does cycle mean in fatigue strength diagram?
A shaft at an usual factory might rotate 2000-3000 (10^3-10^4) per day. So, its rotation cycle easily reaches numbers indicated on X axis below. What does number of cycles in the diagram below exactly ...
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Will a thin overcoat of silicone sealant protect a non-waterproof adhesive underneath?
I'm trying to bond PMMA to Nylon-6 for a submerged application, and the only thing that I've found that will reliably bond these parts is a 2-part polyurethane. (No epoxies work, I think because of ...
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How do I calculate the strength to weight ratio of a material
I want to manufacture something using metal 3d printing. And I'm now choosing the material. Stainless steel is stronger but much heavier than aluminum, so I want to calculate which material can ...
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Converting data from Chaboche material model from ABAQUS to ANSYS
How to minimize differences when using Chaboche model in ABAQUS and in ANSYS.
For example as I've noticed – in ABAQUS one has rate-dependent plasticity model, but in ANSYS it is rate independent ...
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Calulating the compression deformation using strain data measured by strain gauge _ material engineering
I'm studying material engineering and conducting some experiment.
The experiment was measuring the strain of long steel bar.
The bar is compressed from left side and deformed shortened.
Using strain ...
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Units of measurement for structural analysis
FEA engine
I'm using CCX finite elements analysis engine along with its pre- and post-processor CGX:
http://www.dhondt.de/index.html
https://github.com/calculix
Example
I'm looking at one example here ...
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How to draw a isometric view of the block in the picture below?
Can anyone give me some guidance with this question? I'm finding it a bit difficult.How is the object suppose to look like?
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Replicating an impact impulse
I am building a test-rig for a device. I have operational data showing the device experiences impact loads resembling a half-sine pulse with width dt and magnitude F. The test rig's purpose is to ...
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Would stainless steel or titanium punched tape be feasible for data achiving?
I was thinking of ways to archive simple data for a long, long, long time. So I thought of punched tape with data stored as 7 bit ASCII. Just go with me on this :-) Something like:-
The above is ...
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Valox 420 30% glass wear
I am seeking assistance regarding thermoplastic material wear on a new product I am developing.
The attached image is molded out of Valox 420 30% glass. In the left side image, the locking dents are ...
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Corrosion of Ice Auger Blades
I am wondering about corrosion of the steel blades on my ice fishing auger. The auger is used on fresh water lakes (ie no salt involved). I have traditionally brought the auger inside to melt the ice ...
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What would be an ideal material to use for O-rings on a canister in a lubricant-less, high-velocity pneumatic tube system?
I am interested in building an experimental lubricant-less pneumatic tube system in which the canister will be propelled up to a high-velocity, reaching a peak velocity of approximately 100 m/s before ...
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