Questions tagged [strength]
This is to be used for topics regarding the strength of materials, the analysis of internal forces in a body and all the governing principles which considers deformation of bodies.
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What is the physical reasoning behind metal becoming stronger and harder if heat treated?
I was wondering that if a proper process of heat treatment (heating to a temperature above upper critical temperature, then soaking and then quenching) is applied to a metal like steel, then what ...
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Why does the stress-strain curve decrease?
This is a stress-strain diagram
I have noticed that the curve decreases between points C & D and between E & F.
Why does that happen? I expected the curve to always increase since the ...
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How does the strength of a square tube depend on the side size?
There are two square tubes of the same length, material and wall thickness, one being 40x40mm, the other 20x20mm. How does their strength against bending compare?
On the one hand, the cross-sectional ...
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What is strain/loading rate dependence/sensitivity of compressive strength of brittle materials?
What is the definition of strain/loading rate dependence/sensitivity of compressive strength of brittle materials? Is it general strain/loading or it is specific for the brittle materials?
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Could a vacuum tank ever be light enough to be boyant in air?
Given futuristic materials, could a structure ever be strong enough to contain a vacuum, yet light enough to provide buoyancy under standard atmospheric pressure?
Obviously "futuristic materials" is ...
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Calculating shaft diameter
I'm designing a circular shaft that's going to carry a spread radial load of about 200kg and also transmit a 160Nm torque. I'm not very familiar with materials but what I'm guessing I'll be able to ...
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Can concrete lose strength during curing?
We cast a bridge's concrete deck and kept samples for concrete strength tests at 7 and 28 days.
We took a test at 7 days, and the test result were over the design strength (designed for 30 MPa, ...
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Would a partial space elevator work? [closed]
Background
The normal space elevator (that reaches from the Earth's surface to a counterweight beyond geostationary) needs a material that's strength/weight ratio is better than any material we have ...
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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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Beam buckling criterion?
If I have an I beam which I subject to some bending load, how can I calculate when the thinner middle part of the I beam will buckle? I though I could use Euler's critical load formula here, but it's ...
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How to provide lateral support for adjacent masonry during installation of steel UC in an old cavity wall?
I've got a structural engineer ready to provide calcs on this job, but there is a specific aspect where I'd like a heads-up what the normal approach would be, before I raise it with him, in case he ...
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How to determine tensile strength while the normalised tensile strength is known?
I try to design a shaft with yet unknown diameter, i know the distribution of forces and stresses (shear, torsion and normal) in/ along the shaft. I need just one more parameter nl. the tensile ...
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What methods are there to test the flexural, tensile and compressive strength of concrete?
The only one I know is the three point bending test for flexural strength.
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How to compute core stress in honeycomb structure?
Assume I have a honecomb(sandwich) panel under distributed normal load. Each edge of this panel is simply supported(pinned) as on the picture below:
The problem is how to find the core stresses ��-z (...
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Distance of Pivot from the Rear axle
I am designing an NSAM crane. I have encountered the following issue when designing the vehicle:
Generally the pivot(or the point about which the NSAM crane rotates) is in the center. But from two ...
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