Questions tagged [shear]

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3answers
76 views

Why does concentrated shear force on a beam influence the whole beam?

This might be a silly question but can someone explain how this shear force on the right side of the beam causes Qy throught the whole beam? I understand it mathematically but not conceptually so I ...
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2answers
88 views

Shear force and bending moment for continuous span

It's given that L1 = 5m, L2 and L3= 7.5m, w = 8.9kN/m , I am asked to find the bending moment using these coefficient.. Prior to this , i need to have the value of shear force first.Shear force = ...
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0answers
19 views

How can I increase the strength of this clutch without shearing my bushings?

Here's the setup: (C) is a clutch. Beyond (C) is the source of torque. The belt (D) transfers the motion from the clutch to the sprocket (B). (B) then transfers the motion to (A) by way of 9 ...
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0answers
16 views

Regarding the ITTC Guidelines for Ship CFD applications

I was reading through the ITTC – Recommended Procedures and Guidelines - Practical Guidelines for Ship CFD Applications (https://ittc.info/media/4196/75-03-02-03.pdf) document and this little thing ...
3
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1answer
71 views

Does notching the corner of an angle brace member help or hurt when shear lag is present?

Does notching or cutting out the corner of an angle brace distribute stress better along the flange of a member with shear lag or reduce the stressed edge of the flange's ability to resist deformation?...
0
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1answer
78 views

stress/shear analysis of components

I am working on analyzing a few problems, but have not really come across this type of stress concentration problem. Does anyone know where I can study the analysis of this situation? Pressing ball ...
0
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1answer
29 views

Shear force requirement

I am building a pneumatic shear to cut .135" C1018 round wire. We will be holding the wire in a hardened thimble and using a heat treated beveled cutting knife. How much force do we need to be able ...
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0answers
5 views

What degree of open span/narrow support can rigid PIR thermal insulating foam sustain under the short term load of setting concrete?

I've found data related to the deformation and shear performance of typical PIR (polyisocyanurate) foams such as Celotex/Kingspan, but I'm not sure how to use these figures in my own situation. I am ...
2
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2answers
312 views

Deflection of a cantilever beam composed of separate (not bonded) planks

In the case of a simple cantilever beam having a uniform shape and being loaded at its end - the calculation of the deflection at any point along the beam is well known. What happens if we split it ...
1
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1answer
58 views

Shear force and bending diagram un-uniformly distributed load

I already got great help on this topic, but I'd like to make sure that I get it. For example, take a beam of length 6 meters, left side fixed support and right side rolled support. There is a load of ...
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0answers
13 views

Shear between which two fluids is better for atomisation - liquid & liquid or gas & liquid?

In designing an atomizer which generates a spray of liquid, one can adopt atomisation through shear. Shear in the following cases are to be considered: stagnant Gas- moving Liquid: in this gas case ...
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0answers
41 views

Influence of shear force on pressed part with steep walls

I'm working on a project that involves pressing a softened thermoplastic sheet in a two-part mold to form a part 0.090" thick. None of us at our small company are experts in matched molds, and we've ...
0
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1answer
126 views

Why does the fulcrum pin of a band brake experience “double” shear stress [closed]

My machine design textbook states that the fulcrum pin of a band brake during braking is subjected to a double shear. How do you say it is subjected to a double shear and not to a single one. By ...
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2answers
90 views

Determining when bolt will bend

I'm attaching a metal pipe to a metal tube as shown in the below diagram. The bolt is threaded through one wall of the pipe and does not pass through the opposite wall of the pipe, but is tightened to ...
2
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1answer
113 views

What is the difference “maximum” shear stress and shear stress

Shear stress is introduced in statics as $\frac{P}{A}$. However, the maximum shear stress with neutral axis is different. It is $\frac{3P}{2bh}$ (Where $b$ is width and $h$ is height) What is the ...
2
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4answers
2k views

What is the difference between tau = VQ/It and tau = V/A?

What is the difference between the formulas $\tau = VQ/It$ and $\tau = V/A$ for finding shear stress due to transverse loading? I understand that the use of first moment of area, is the only reason ...
2
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1answer
101 views

Failure due to shear stress on rod lip?

Let’s say I have a circular rod that has an outside lip with a larger diameter and certain height. The rod moves axially, and the intent of the lip is to mechanically stop the rod at a maximum axial ...
3
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0answers
51 views

Normal stress - shear stress pairs not lying on Mohrs' Circles

The three Mohr's circles depict all the possible normal stress / shear stress combinations when material is taken and rotated along one of it's axes of principal stress. Nevertheless, it is clear that ...
1
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3answers
90 views

Difference in shear stress - one bolt vs two

So i have a little diagram to visualize: So lets say i have a 20 mm plate connected with two M8 bolts, and i apply a 30kN force in the direction shown in picture. Question is - would the force be ...
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1answer
32 views

when is an inclined force analysed?

problem 1-5, James M. Gere's mechanics of materials text book in the given example : for a, b and c he used the full 12k value of P to get the bearing and shear values. my logic was to analyse the ...
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0answers
27 views

How to consider shear forces in CEB/fib 2010 three-layer model for concrete slab design?

I have a question about design of concrete shells with three-layer method described in p.7.3.2.2 fib Model Code for concrete structures. The main idea of method is that we divide shell on three layers....
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2answers
74 views

How to fix sheared flats on a pulley?

On my belt sander, there is a small cast aluminum drive pulley/wheel about 1.25" diameter that slips over a 5/16" shaft. Two flats on the shaft mate with two flats inside the bore. The internal flats ...
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0answers
49 views

Calculating stress from elementary tension and bending formulas

I need help with this problem. Suppose we have a cantilever with width $-c \leq y \leq c$ and length $x=l$ fixed at $x=0$. We know that it is loaded by uniform shear along the lower edge with ...
1
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2answers
8k views

Maximum shear force of metric steel bolt

I'm struggling to calculate with any confidence the allowable shear force for a metric bolt holding two aluminium pieces together. I only need an approximate figure, since I will allow a very large ...
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2answers
3k views

Determine shear flow direction in profile/beam section

I have been looking at the location of shear flow centers for profiles for my mechanics of materials course. I am trying to figure out how to determine the direction of the shear flow in a given beam ...
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0answers
152 views

Distribution of shear stress in beam bending

Beer, Johnston, and DeWolf's Mechanics of Materials includes the following image of the distribution of shear stresses in a bending beam: (Axes and load vector carried forward from Fig 6.1 in the text ...
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1answer
183 views

Connection for beam very close to concrete wall

The following picture is pretty self-explanatory. I need a connection for a beam that is coming in very close to a concrete wall edge (north/south beam in picture). The embedded plate with nelson ...
0
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1answer
67 views

Shear Stress / Flexure Stress Formulas / Tables

Is there something similar to the Section Modulus in the Flexure Formula $$\rho_{max} = \dfrac{M_{max}}{S}$$ where $S = \dfrac{I}{c}$ for shear stress formula? So in $$\tau_{max} = \dfrac{VQ}{IT}$$...
1
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1answer
315 views

Shear strength of reinforced concrete filled PVC pipe

BACKGROUND: I'm burying a 3 foot x 4 foot drainage box (2 foot tall) in my driveway to hold/distribute excess gutter flow (1" of rain produces ~21cuft). I've constructed the walls with brick, laid on ...
5
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1answer
387 views

Is there a difference between punching shear for columns on slabs vs slabs on columns?

Might there a difference in design approach for punching shear for the two scenarios? Or something to pay particular attention to? Is the slope of the shear plane (normally 1:1) the same for both ...