All Questions
Tagged with mechanical-engineering materials
273
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What is the difference between Hooke's Law and Young's Modulus?
In the elastic region where stress is proportional to strain up to elastic limit which is we call Young's Modulus (E). My question is if that is E, then what is Hooke's Law (K=F/x spring stiffness). I ...
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2
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101
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Best way to prepare a rusty metal surface for hardness testing?
I have a hardox #10mm plate that needs to be tested on Rockwell hardness.
As hardox is sensible to heat I would like to avoid any heat treatment before the testing.
The plate has been water cut.
The ...
- 137
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What wire rope to use for a load-bearing telescoping lift, and how to secure it
I'm trying to find a thread that has good fatigue resistance and strength for a telescoping lift to be used in a robotics competition. The lift will lift a weight of around 2-3 kg. I do not intend to ...
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2
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Will the material plastically deform or fail when heating or cooling?
You have a stainless-steel rod with constraints on both ends that is held rigid. Initially, it is at room temperature before getting heated to 300 Celsius. Then, it is cooled to room temperature again....
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mechanism design for matrix of adjustable direction pointer
I need to construct a matrix of light pointers, each one aims in specific direction, and each pointer direction will be adjusted thousands times, size is flexible could be millimeters or centimeter ...
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2
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Preventing leakage in sludge tank
I recently went on a tour to a local water company plant where we were shown a sludge tank which is where the sludge in the water is removed and stored here.
The sludge can be acidic and so can cause ...
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1
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46
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Impact damage in composite materials
I want to do a test where I use composite materials to mimic impact damage on aircraft materials such as impact from hailstone while the aircraft is in flight.
I will cut out specimen sheets using a ...
- 163
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How do I properly scale down a force for scale-down model testing?
I am designing structural frame for a shipping container that would have 8000 lbs of weight stacked on top of it. Of course, i don't access to real size container. I have built a model whose scale is ...
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Can stainless steel be used in continuous high temperature environment (500°C to 850°C)
Can i use stainless steel as a furnace roof. Furnace temperature will be max upto 850°C. If so which ss grade will be the best in this situation. Thanks
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2
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2
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213
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Homogeneous materials and direction dependence of properties
A homogeneous material is a material which has a uniform composition throughout.
What do we mean when we say "uniform composition"?
I have learnt about pure substances in Thermodynamics ...
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101
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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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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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9
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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 ...
- 119
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2
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515
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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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4
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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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