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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2answers
46 views

I can't decipher the string printed on my steel pipe (to find the yield stress)

TLDR; Can you please help me understanding the string in the picture and help me finding the yield stress that my metal can handle? Full story I am trying to estimate how much load some zinc-coated ...
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29 views

Steel grade recommendation

I'm working on a private project (no commercial motivations here) to build an outdoor (wood fired) pizza oven for my garden. It's basically made of steel, so my question is which steel grade would be ...
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1answer
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what actually cause quench cracking ? non-uniform cooling or rapid cooling?

It’s well known that quenching most alloyed steels starting from AISI 4140 to high speed steels in water, brine , or sometimes oil will cause cracking and distortions. in industry oil quenching ...
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1answer
35 views

Alternative to high cost plexiglas and polycarbonate for large project

I am planning the construction of a large scale dodecahedron infinity mirror, and so far the largest cost by far are the glass (or similar clear, hard material) pentagons. Each panel would be screwed ...
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1answer
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What kind of metal are eye glasses frames made from?

I've noticed that prescription eye glasses frames are often made from metal that is quite rigid. It's surprisingly difficult to bend the metal, despite how thin it is. And if it does bend, it doesn't ...
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3answers
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Why we needed to relate internal resistive forces with area (stress)?

When we load a body, say a prismatic bar, axially, internal resistive forces are developed within it to oppose the elongation or compression. What was the need of relating these internal resistive ...
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9answers
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Aluminum weight saving

"Aluminum saves weight! Its 3 times lighter than steel!" Also its 3 times weaker and 3 times softer. When comparing stiffness and strenght to weight ratio, aluminum isnt any better than ...
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27 views

Name of specialty screw [closed]

I am looking for screw with a head in the shape of a hook but flat like a T-screw in size M3. I am not familiar with any technical name for this and wasn't able to find anything. Does this exist / ...
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2answers
59 views

is there any relationship between endurance limit and tensile strength for thermoplastics?

i want to know about the relationship between fatigue strength and tensile strength for thermoplastics especially PPSU (POLYPHENYLSULPHONE)@23 DEG.
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1answer
73 views

How to find yield strength and Young Modulus from S-S curve

I have a S-S curve and am not sure how to find yield strength from it as when I did 0.2% strain (0.002 * strain at fracture) I get a small number that plots close to (0,0)? For young modulus, I am not ...
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38 views

What is the compressive strength of graphene?

It is easy to find on Google that the tensile strength of graphene is 130,000 MPa. But what is it's compressive strength?
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What tools are used to design and 'program' shape-memory polymers?

I've been reading about shape-memory polymers. However, it is not clear to me what tools could be used to design the ultimate shape (the shape one obtains after applying for example electricity or ...
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1answer
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Can the house in the image be built as a prefab? Can wool bricks be used in its construction?

So I wanted to ask if a prefab can be built that looks like this house? Also, can wool bricks be used in the house's construction?
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What is the difference between wrought aluminum and cast aluminum? Is it possible to cast 6061 aluminum?

I'm currently learning about material properties and I'm not certain what the main differences are between the different types of aluminum. The aluminum I'm most familiar with is 6061-T6 aluminum and ...
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1answer
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martensitic transformation, starting and finishing temperature

Searching about microstructure of Cu-Ni-Zn alloys I came across an article (published 2017) which in Conclusion says: Blockquote It was observed that the starting and finishing transformation ...
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Abaqus CAE - how to measure/calculate area of a certain threshold within the Visualisation module?

I have been using Abaqus CAE to model a CT-specimen being pulled apart, in order to observe the resultant plastic zone shape around the crack tip. To reduce computational cost, I have modelled a ...
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1answer
50 views

Generic category of PBT thermoplastic

I'm an EE, but I'm working on a project at work where I need to venture into materials science & chemistry. My question is, does thermoplastic, Polybutylene terephthalate (PBT), fall into any of ...
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1answer
57 views

Are there any ways to know whether the element has failed under loading, while knowing only limited properties?

I opt to check whether a precast concrete wall (no reinforcements, only concrete) withstand both vertical and lateral loading condition but the only properties I know are the Young's Modulus, density, ...
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1answer
318 views

Sizing crumple zone for multi-vehicle collisions

I need to size bumper beams for the crumple zone of a very lightweight vehicle. Together with the driver, the vehicle will weigh 300kg. Sizing the beams for a single-vehicle collision against a ...
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3answers
13k views

Strength vs. Hardness vs. Toughness

for this question: "What is the difference between strength, hardness and toughness in materials?" i have searched and have found these following definitions Strength refers to resistance to ...
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4answers
117 views

How are these bricks being supported?

My question is how can all of these bricks be supported by the thin columns on either side? How can there be that much empty space under all of the bricks that the arrow is going through? Looking at ...
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3answers
123 views

Could pre-stressed graphene be used to reinforce granite block construction?

I am curious whether this will become an option, especially for longer lasting structures. Could pre-stressed graphene or another high tensile strength material by used to reinforce granite block ...
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3answers
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Why are vehicle interiors susceptible to damage from the sun when some plastics seem to be fine?

My vehicle built in '08 suffered extreme damage to the dashboard, it permanently melted and is now sticky to the touch even when cool. Presumably this is why so many vehicle owners use covers to ...
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1answer
42 views

Economical difference with high-pressure vessel design pressures for fixed volume

Suppose space is not an issue and I need a fixed volume of compressed air (for storage), say 1m³. Is it more economical to manufacture a thick-walled vessel but with a smaller volume or a thin-walled ...
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1answer
40 views

What impact does reduction internal stress cause?

I have noted that recovery primarily reduces the internal stresses of the material.What is particularly confusing is why would that work out.A slightly detailed answer to this is most recommended.Also ...
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1answer
62 views

Metallic flow behavior under eccentric loading conditions

So, I did a quick search around and didn't seem to find anything regarding this, so I thought perhaps I should just ask a question. Metals are malleable and will generally flow/deform if you roll it ...
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2answers
67 views

How are composite fiber metal laminate panels bonded together?

Apologies if this is the wrong group for this question, I am not sure whether it has to be posted here or in Aviation. As far as I know most of composite fiber metal laminates are used in aviation. A ...
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1answer
151 views

In what cases are the roughness values Rt and Ra used?

Roughness measurement instruments output those two values, where Rt is the distance between the top of the highest peak and the bottom of the lowest valley, and Ra is the average distance of every ...
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2answers
107 views

Aluminum or Copper, which one is better to control and maintain the temperature?

Friends, I am an EE/SW/Controls eng. Please, pardon me of perhaps incorrect terminologies. I am working on a R&D project: A chemical lab equipment has a 2" long metal pipe enclosed in ...
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1answer
37 views

Mirror specification used in Solar Fresnel Collector systems

Im designing a Linear Fresnel collector system, and wanted to know what type of mirrors would be suitable for use as the reflectors. Thickness, type, coating etc. I couldnt find a manufacturer of ''...
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1answer
138 views

Instron Test Profile -- Failure when steadily dropping the load

I'm working on an Instron 5969 tester, and I'm trying to measure the residual strain in materials within their elastic zone. I'm using the test profile, which allows me to stretch the material a ...
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4answers
62 views

Physical Examples of Completely Ductile Fractures

Generally speaking, a material that experiences a ductile fracture will exhibit a "cup-and-cone" shape for the two ends of the fracture, as can be seen in many real world examples (and in ...
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1answer
68 views

Lubricant fluid and Rubber compatibility

I have a portable band saw, which I plan to add lubricant fluid to (this is getting ahead of myself, as I haven't even constructed a portable band saw stand). The main problem with this and the reason ...
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116 views

Yield properties of plastic material

What is meant by yield of isotropic plastic material? How is yield of Isotropic plastic material different from the term normal yield which is referred as transition from elastic behaviour to plastic....
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2answers
77 views

Best support for a granite table top?: Flat bar 316L Stainless Steel or equal box section or unequal box section

Project is outdoor granite topped table. Table legs are two isosceles trapezoids crossed together at 90 degrees, with the legs having an internal angle of 80 degrees, made from 100 x 100 x 4mm 316L ...
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2answers
47 views

What is meant by Material Toughness being the Ability to Absorb Energy Before Fracture?

Toughness is defined as ability of material to absorb energy when deforming before fracture. Materials with high ductility and strength will have high toughness. What is meant by ability of material ...
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1answer
35 views

Cheap material and construction to insulate balcony during the winter?

It's a long shot, but I was wondering whether there is any material I can wrap around my balcony to be able to use it like a sun room during the winter. A plastic-like material that I could span ...
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2answers
49 views

How can I describe cold work and atomic structure?

A copper wire (42 cm x 0.25 cm diameter) twisted to failure did not change its dimensions significantly. How can I visualize or quantify the cold work done (tensile at the exterior, compressive in the ...
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1answer
169 views

What is the best heat and moisture resistant adhesive?

I have to join metal to metal (Aluminium or SS piece onto a vertical SS wall) that could take a shear load of say, 600gm with an area of contact of around 2cm^2. The environment is above boiling ...
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2answers
55 views

How do I get a thin section slice of grooved metal to analyze groove depth under a microscope?

I have a sheet of metal that had grooves cut by laser in it; I need to analyze the depth of the grooves, and for that I think I will need to obtain a thin section slice of the metal and then put the ...
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1answer
43 views

Thermal expansion during the course of melting (in metals specifically)

The question is with regards to Thermal Expansion at the point of melting. My basic understanding is that a material will generally undergo linear thermal expansion until some phase change occurs (...
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4answers
129 views

What thickness of steel bar/pipe for home gym?

I would like to build a rack for my home with a pull up bar. I'm leaning towards a steel pipe with a diameter of 42.4 mm, but have no idea how to determine what wall thickness is needed so that the ...
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1answer
54 views

Low slope roofing

I’m having trouble finding resources that explain/describe type of low slope roof for cold weather. Is single ply or metal standing seam or BUR better if we are considering all cold weather related ...
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0answers
23 views

How to calculate specimen strain in split hopkinson pressure bar?

I want to plot the stress-strain chart for a specimen after a test. In the output file of excel, I have "Strain of transmitted bar" and "Strain of the incident bar" I also have ...
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1answer
40 views

Question about a particular statement on plastic deformation of single crystals

"...the wider the dislocation, the lower is the elastic energy of the crystal because the atomic spacing in the slip direction is closer to its equilibrium spacing." What has elastic energy ...
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2answers
438 views

Force required to deform sheet metal

Hi all. I am building a machine to deform sheet metal into corrugations. I have attached an image that I got off a presentation from MIT's website. In the example, they provide a formula for the ...
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0answers
50 views

How is a plank able to stop a spring door [closed]

So , here we have door which can get closed on its own due to spring. Agenda of Q is to put sth beside the door so that the door does not close . The Q tells us that when we put a brick of 0.5kg. Door ...
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0answers
17 views

Book recommendation for hydrodynamics of bubbles, drops, and particles

I am wondering if someone could please recommend to me some references on the topic of hydrodynamics of bubbles, drops, and particles, preferably in the context of complex and bio fluids. I am ...
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1answer
40 views

Constant crosshead speed or constant strain rate for comparing samples of differing thickness?

Say I have two different specimens of a material, one is 10mm thick and the other is 1mm thick. Assume that this material has properties which vary depending on the rate of deformation (I would call ...
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2answers
37 views

Assuming identical hole perimeter, for which shape is the stress minimized?

I know that stress is concentrated in the fillets, but what about the average stress along the entire hole? We can choose a circle, an ellipse, or a square with fillets. For which shape would the ...

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