Questions tagged [mechanical-failure]
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13 questions with no upvoted or accepted answers
How to compare small and large scale model of an IC engine to predict force, torque, rpm etc generated by actual engine?
I have this 6 cylinder radial engine designed in Solidworks. Rendering Blueprint (Source:Inventor Wizards) And I want to perform some motion analysis on this engine to make some prediction about it'...
Determining elastic limit for a nonlinearly elastic material, to be used for calculating chord modulus (i.e. Young's modulus) in tensile testing
I have a protein material that is nonlinearly elastic; from the get-go, the stress-strain curve shows quite an immediate curvature. I have to use chord modulus (reference to ASTM E11-04). The problem! ...
Is a motor failure caused by a defect bearing considered to be a failure mode or is it higher vibration and speed loss in FMEA/FMECA?
Let us assume we have a motor with a bearing which is exhibited to wear. Over time, we can observe higher vibration, increased noise and the motor speed reduces due to the bearing fault. In the end, ...
How to align a shaft with gear box and mechanical seal and uc bearing?
I have a 15 inch (381 mm) shaft with 24.95 mm diameter. That shaft is attached with a gearbox (ratio 5:1). The gearbox is driven by a motor (rpm 2750). There is one UC bearing and mechanical seal and ...
Design Factor and Design Uncertainty Calculation Question
I recently had a discussion about design factors and design uncertainty. Looking in Shigley's Mechanical Engineering Design, pg. 17, ed. 3, there is a detailed discussion of this topic. The authors ...
Specifications of Tensile Test Specimen?
I am Currently Working on Measuring Various Mechanical Properties of Metalic Materials using Universal Testing Machine (UTM) at Various Temperatures. I know that for Testing at Ambient Conditions, ...
Spherical metal ball contains high pressure superheated steam. If we allow it to cool in atmospheric air, at what pressure steel ball will implode?
Theoretically, I know that steam will start cooling slowly at constant volume to attain thermal equilibrium as per zeroth law of thermodynamics. After some time, steam will condense to water creating ...
Can the cooling fan in laptop or ceiling fan shaft fail as result of critical speed? But that's not often the case, even if they rotate at high speed
Cooling fan in PC start very fast. Is there any chance of it's failure due to resonance? In opposite, ceiling fan starts very slow, why doesn't it fail by resonance? Does regulator have any ...
Which will be stronger for securing a cantilever umbrella in a deck
I am securing a cantilever umbrella baseplate to a deck. The decking timber will be reinforced with a pine nog between the deck joists. The options that I have are to use 10mm stainless steel coach ...
Long term deflection
I've been working with a team of 'designers' that are highly concerned over a potential failure mode of ABS plastic. Their theory is that under a static load well under the yield point of the material ...
Plastic failure evaluation of steel using FEM
I would like to evaluate failure in steel using FEM, especially in geometries with stress concentrations (notches etc.). One possibility is to calculate the stress distribution using a purely linear ...
compression buckling under lateral load
I'm trying to figure out what size of round tube to use for a tensegrity structure that'll probably have people climbing on it. The rigid elements are 21' steel tubes, and in normal cases they ...
Length of semi major axis for the ellipse in "Total Strain Energy theory"
The equation describing the "Total Strain Energy Theory" (Haigh & Beltrami's Theory of failure) is given as follows: $$σ_1 + σ_2 - 2μ σ_1 σ_2 ≤ (Syt)^2$$ where $σ_1$ and $σ_2$ are ...