All Questions
Tagged with mechanical-engineering solid-mechanics
111
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How to geometrically derive stress transformation equations from Mohr's circle?
Consider the simple case of a 2D stress element with its corresponding Mohr's circle:
Now, for stress transformation using Mohr's circle, we rotate the diameter AB by twice the angle of rotation of ...
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Circumferential stress in a toroidal shell
Consider the following formula for circumferential stress (σ2) in a toroidal shell (taken from Roark's Formulae for Stress and Strain):
It seems that it has been derived by using simple force balance ...
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32
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DLC wear resistance
I read that a thickness of one micrometer of DLC coating (which, if I understood correctly, shows similar properties to diamond), increases the lifespan of an item plated with it from a week to more ...
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Shape of a beam that is bowed under compression?
Suppose you have a uniform beam, such as a piece of plywood that is 4 feet long, six inches wide, and half an inch thick. Suppose you cause it to bend by attaching, for example, a string under ...
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Does the magnitude or range of interaction of a force affect which layer dominates the mechanical response of a multilayered structure?
Suppose I have a two-layered material, with a stiff and thin outer layer (high E) and a soft (low E) and thick inner layer.
Intuitively, it feels like the effect of short-ranged forces (e.g., van der ...
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How to calculate the direction of shear stress due to shear force on a circular cross section?
For a circular cross section, we know that the shear stress due to a shear force at the boundary (the radius of the circle) has to be tangent to the curvature. This is so that we have no radial shear ...
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65
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Is it true that there are some principles of mechanical trasmissions and junctions that were known for long but became possible only recently?
Is this true that some parts of mechanisms, such as various types of transmissions or junctions, while were known theoretically for a long time, became possible practically only with advent of 3D ...
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Trying to detach a detachable handle on a meat grinder
I'm trying to detach the handle from my meat grinder. I'm not sure what this kind of lock is called but it had a crescent/half moon shape that locks against the grinding (clockwise) motion. In order ...
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2
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259
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What is the difference between maximum principal strain and maximum in-plane principal strain?
For the purpose of answering/explaining this, it does not need to be restricted to strains (i.e., it can be stresses too). I am mainly trying to understand when to use which one (i.e., if I am ...
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Vertically oriented shaft sleeve rubbing against bearing - Calculating side load due to a certain amount of tilt
At some given angle of tilt, we will perceive the pressing of a rotating SS shaft sleeve against a greased bronze journal bearing. How would you compute the side load force on the bottommost bearing ...
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Does gold have elastic behavior?
I know structural steel is considered to have an elastic behavior and after a certain deformation, it has a plastic behavior.
How about gold metal?
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What is the meaning of the traction continuity condition in the generalized momentum balance (continuum mechanics)?
In Nonlinear Finite Elements for Continua and Structures by Belytschko and al. it is stated:
As we have already noted, the strong form, or generalized momentum balance, consists of the momentum ...
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76
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Building Equations of Motion
The following figures represent a model of a building, can someone help me, extract the newton equations of motion and determine the degrees of freedom.
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Which design is most resistant to tipping against 90 degree downward force?
Have a question sort of related to question at (What calculation to find how much force before tipping over?) but with slight modifications.
Trying to weld some tubing together and onto a heavier base ...
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Why are the indices of term of the Cauchy Stress Tensor and Maxwell Stress Tensor opposite to each other?
For CST (https://en.wikipedia.org/wiki/Cauchy_stress_tensor), the first index represents the plane and the second index represents the direction:
For MST (https://en.wikipedia.org/wiki/...
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