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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0answers
14 views

Temperature of water decreasing lower during boil

I am trying to understand this phenomenen that I have noticed with my system (40L capacity boiler with a NTC thermistor located at the bottom). When boiling 10 Litres, the temperature reading reaches ...
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3answers
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Difference between fast or slow rising force on materials' breaking strength

Assume that force is applied to a material like a rope, steel cable or a beam until it tears apart. Does it make any difference for the breaking point if the force rises slowly or really fast?
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1answer
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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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2answers
66 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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1answer
36 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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3answers
46 views

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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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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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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0answers
24 views

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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2answers
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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1answer
30 views

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
28 views

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
58 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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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
1k views

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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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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2answers
108 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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4answers
64 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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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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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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4answers
130 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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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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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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0answers
21 views

Do all thermoelectric generators (TEG) require two distinct metals?

Most thermocouples that I've seen being sold online consist of two separate metal wires connected at junctions. Many smaller thermoelectric generators consist of a combination of iron and copper or ...
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1answer
31 views

How is the assumption that stress and strain are elastic everywhere is valid for STRESS-LIFE method for fatigue life calculation?

Stress life method is generally employed for high-cycle fatigue (HCF) applications. while HCF region is approximated by $\sigma=a(N)^b$ which gives a linear graph on log-log scale, for steels it ...
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0answers
20 views

Question about tensile test of model from research paper [closed]

In this paper they made a tensile force test on their four different models with four different pore size structure to show that pore size is not affecting on the tensile force. But it seems that they ...
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2answers
62 views

What materials should I use to build a working 1:50 scale battleship?

I have been writing, drafting, and drawing out for probably more than a year now, about how to size, weld, and wire a 1:50 scale IJN Yamato Battleship, one I can actually ride in, drive, and (If it's ...
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5answers
1k views

Is there a threadlocker that requires heat to release and can withstand thousands of heat-cool cycles without needing to be reapplied or deteriorating

Is there a threadlocker compound that immobilizes the bolt while cool and requires high heat to release, that can withstand very high heat and thousands of heat-cool cycles without needing to be ...
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3answers
190 views

Do all structures deform if put a load on them?

Suppose I have a concrete wall in front of me and I push on it, now it seems that I do work and the energy has magically disappeared. I am trying to figure out how this works, the explanation I ...
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0answers
26 views

Mouth-style whistles, i.e. whistles using flexible materials [closed]

I'm wondering if there is much literature around whistling, i.e. human-mouth style whistling. Either using your lips or your fingers. To make my query less vague: say I wanted to create a rubber ...
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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
67 views

Why are the facades of historic residential buildings in Paris tilted backwards?

In any major city that features an historical center, the list of attractions advertised by tourist guides seldom includes what, in my opinion, would constitute the destination's most important part: ...
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6answers
576 views

Increasing torsional-stress resistance of an Auger at its motor-shaft joint

An auger is used to move plastic balls and is rotated by a stepper motor. Due to the balls getting jammed sometimes, this induces stress on the auger at the motor-shaft junction and breaks. Images ...
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2answers
31 views

Weight distribution on sliding or “pocket” doors

Does anyone know if hollow sliding/pocket doors have a weight/more dense wood at the bottom of the door to prevent from swinging?
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2answers
67 views

Heat Deflection VS Coefficient of Thermal Expansion?

I was looking at a spec sheet for a photopolymer and saw these two different subsections under the "Thermal" section. I tried Googling around as I usually do, but no site could give me the ...
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2answers
62 views

Selecting material for plastic hinge

I have designed a plastic part shown in blue that will be injection moulded. The part is a lever that takes 1 mm of movement downward and outputs 6 mm of movement upward. Circled in green is a hinge ...
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1answer
23 views

Rubber that remains Elastic in Hot and Dry Application

I work for a valve manufacturing company and our customers have an application where very large volumes of hot (200F), dry air pass through our valve. As a consequence, the rubber (carboxylated ...
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2answers
2k views

How do suction cups work?

These are suction-mounting hooks. I want to visualize and understand how do they stick on walls. After these hooks stick on wall. Like we compressed them. How? Since gases are compressible up to a ...
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3answers
40 views

Equivalent sheet metal thickness of different alloys

I want to replace steel plates that are being used as trim tabs on a boat with 90-10 cupronickel. The main design parameter is to make sure the plate has no less flex than the part being replaced. In ...
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2answers
40 views

Modeling composite material fibers orientation in a FEA

I am looking for guidance for analyzing composite materials that are reinforced by fibers of some sort. A good mental model would be bars of steel in concrete. The concrete will have its own physics ...
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1answer
32 views

Determining max shear stress

So I understand that shear stress can be either in the the form of transverse or torsional or both at the same time. And normal stress is due to the moment or a force normal to the surface. My ...
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1answer
63 views

Stress strain curve stress and resilience

When calculating 0.2% offset from stress strain curve please, do I take 0.2% of the original length and then, divide this by original length to get strain and plot this please? And for resilience, is ...
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1answer
74 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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0answers
39 views

Manufacturing with glass panels [closed]

I would like to design a 3.2-inch LCD display onto a product. The best aesthetic I have seen is using a flush glass screen front face. My product does not use touch screen. How would I go about ...
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0answers
34 views

Filler Material

If I was to add a filler to a metallic substance, is it possible for the Young's modulus to decrease as filler content increases? Also, when a filler is added, how do the atoms change for improving ...
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4answers
66 views

Is it somehow possible to "lock" moving boxes without damaging them? [closed]

I have a standard moving box like this: Of course, since I'm asking about it, they don't have a top-down photo. These are other photos, if they help you understand how it's constructed better: ...
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2answers
45 views

Mounting a digital indicator on a plate

I have a flat aluminium plate and I need to mount a digital indicator[1] on it. The digital indicator doesn't seem to have any mounting holes itself so I think I need to use a clamp to hold it. I don'...
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1answer
1k views

Is cast iron better that Copper or Aluminum for cooking steaks?

Folk wisdom states that Cast Iron pan is the best for searing steak because of its high heat retention relative to the aluminum/copper counterpart. However, this doesn't make sense in practice... ...

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