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Questions tagged [shear]

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9 votes
7 answers
45k views

Metric bolt shear strength for a layman

As a layman, how can I know the shear strength of a particular size bolt? For example, if I want to attach something to the internal wall of my van ( 1mm stainless steel ) using a rivnut and standard ...
Robert S. Barnes's user avatar
5 votes
1 answer
854 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 ...
SlydeRule's user avatar
  • 1,236
3 votes
2 answers
2k views

Difference between shear flow and shear stress

I have been given the following problem in one of my courses. To say that I'm struggling in the course would be an understatement... I'm just wondering what the difference between shear flow and ...
contract-society's user avatar
3 votes
1 answer
386 views

How do you ensure that a beam is loaded through the shear center?

Reading about shearing stresses in beams, it is commonly stated that it is necessary to load a section through its shear center, so no twisting is applied to the beam. This is specially important in ...
Msegade's user avatar
  • 193
3 votes
1 answer
468 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?...
LLF264's user avatar
  • 33
3 votes
0 answers
36 views

How do FE solvers solve the case of panel buckling under pure shear?

How do FE solvers solve the case of panel buckling under pure shear? The main problem is that global matrix of initial stess is singular in that case. One method is to apply some forces that shear is ...
Евгений Павлов's user avatar
3 votes
0 answers
355 views

Boeing 737NG pickle fork cracking. What determines the fastener layout?

Boeing 737NG aircraft are currently being checked for cracking in the "pickle fork" assembly that attaches the fuselage to the wings. The affected joint has 4 fasteners that attach the fork to the ...
emrys57's user avatar
  • 155
3 votes
0 answers
107 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 ...
Bruno KM's user avatar
  • 131
2 votes
3 answers
3k 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 ...
Yaniv Ben David's user avatar
2 votes
3 answers
234 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 ...
M. Wother's user avatar
  • 351
2 votes
3 answers
1k 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 ...
waitwhat's user avatar
2 votes
1 answer
805 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 ...
user15001's user avatar
2 votes
2 answers
23k 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 ...
Jodes's user avatar
  • 1,304
2 votes
2 answers
3k views

How do you calculate the shear force on the screws that connect a door to a jamb via hinges

I'm trying to calculate the shear forces on hinge screws or bolts. Here is a schematic of the door with the relevant values: First, I took a free body diagram of the door and its hinges. The ...
Ryan's user avatar
  • 67
2 votes
2 answers
4k 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 ...
gunfulker's user avatar
  • 133
2 votes
4 answers
15k 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 ...
juggling_pro's user avatar
2 votes
1 answer
382 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 ...
juggling_pro's user avatar
2 votes
1 answer
145 views

What is the force required to puncture through a sheet of foil against an anvil?

A hardened steel contour with a sharp edge presses against plastic foil which lies on top of a hardened steel anvil plate. What would be the force required to punch through the foil? I am familiar ...
jessegerritsen's user avatar
2 votes
1 answer
280 views

Is the calculated shear strain in a beam, engineering strain or tensorial strain?

Recently I came across a FEM code of a linear deformation beam element, and it made me wonder what is the correct relation between shear stress and shear strain in a beam element. In the beam element ...
Saeid's user avatar
  • 123
2 votes
0 answers
691 views

Double Shear Stress butt joint

A double shear butt joint is shown below in the diagram 4 plates are held together by two bolts. The applied force is 42KN. Determine the shear stress within the joint $$\begin{align} a &= 2 \...
Kyle Anderson's user avatar
2 votes
0 answers
103 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 ...
ASPVL's user avatar
  • 21
2 votes
0 answers
11 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 ...
Stilez's user avatar
  • 571
2 votes
0 answers
102 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....
Ranke's user avatar
  • 21
1 vote
3 answers
2k views

Why does the upper wing skin fail in buckling and lower wing skin does not?

I am aware of the fact that the buckling is mainly caused in the regions of the specimen which are in compression. But the wing skin doesn't take any axial loads and is used to resist shear, atleast ...
Rameez Ul Haq's user avatar
1 vote
4 answers
6k views

Why does a beam in shear crack at 45 degrees?

Why does a beam in shear like in this picture crack at 45 degrees instead of vertically? This is called "Punching shear", and requires concrete reinforcement at an angle: Assuming that the ...
S. Rotos's user avatar
  • 2,259
1 vote
2 answers
4k views

How to calculate failure stress on a hollow pin loaded in shear

Calculating limit stress on a solid pin loaded in shear is straightforward, and there are several handy calculators which will do single shear and even double shear. However, everything I have found ...
Kenn Sebesta's user avatar
1 vote
2 answers
1k views

Why torsional warping does not occur for shafts with circular symmetry?

When we twist a shaft/beam/rod, shearing stresses are produced. The angle by which the end of the shaft rotates can be found as: $${\displaystyle \theta ={\frac {TL}{GJ}}}$$ where $T$ is torque, $L$ ...
S. Rotos's user avatar
  • 2,259
1 vote
2 answers
561 views

What is the difference between max shear stress at neutral axis in bending and max shear stress from Mohr's Circle?

The maximum shear stress which we get from the equation: $\frac{VQ}{It}$ (for instance, the maximum shear stress at the neutral axis for a rectangular beam cross section, fixed at one end and ...
Rameez Ul Haq's user avatar
1 vote
2 answers
7k 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 ...
Maarten -Monica for president's user avatar
1 vote
3 answers
699 views

How to use Mohr's circle to find stresses on a slanted plane?

Here is my attempt to the problem: Does this make sense? rotation clockwise 60* from horizontal to normal of the slanted plane , therefore $2 \times 60$ clockwise as well on Mohr's circle. I am ...
CountDOOKU's user avatar
1 vote
2 answers
110 views

How to find the shear stress just below or just above some elevation?

Say the cross section carries a vertical shearing force of 40 kN. And say I want to find the value of the shear stress just below the section a-a. I am very confused about which area $(A)$ to take ...
CountDOOKU's user avatar
1 vote
1 answer
267 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 ...
user2817017's user avatar
1 vote
1 answer
1k 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 ...
J Baker's user avatar
  • 11
1 vote
2 answers
262 views

How to improve the shear strength of a steel rod?

How can the shear strength of a steel rod be improved? The application I am thinking of is rods used to make bolts where we want the bolt to resist being sheared off after it is attached. Some of the ...
Wallace Park's user avatar
  • 1,635
1 vote
3 answers
792 views

What does negative shear stress mean $\tau \:=\:\frac{VQ}{It\:}$?

$\tau \:=\:\frac{VQ}{It\:}$ My confusion lies within $Q$ term. $Q = yA$ where $A$ is the cross-sectional area of the segment that is connected to the beam at the juncture where the shear flow is ...
CountDOOKU's user avatar
1 vote
1 answer
618 views

Maximum shear in a beam

Engineering books and lectures typically make two things clear: Maximum bending stresses (normal) develop at the beam surfaces, that is, at the greatest distance from the neutral axis. Shear stresses ...
Erik's user avatar
  • 163
1 vote
1 answer
461 views

Shear capacity according to eurocode , when to use which equation

I am looking at eurocode to calculate shear capacity, and under section "6.2.6 Shear", there are two different shear checks: Eq 6.18 Eq 6.19 When there is no torsion we can use equation 6....
greatoak763's user avatar
1 vote
1 answer
80 views

Calculating the diameter of screws that are on radius 160mm from axis of rotation. I need help - I don't know If I'm thinking in the right way

First of all, english is not my first language so if there are some mistakes I made - I'm sorry and I hope everything is understandable. The example I am trying to solve reads the following: The gear ...
Jakub Szurlej's user avatar
1 vote
1 answer
313 views

Physical Significance of Max Shear Stress in a Rod in Compression

For a rod in compression, the max shear stress at a point is $\pm\sigma_x/2$, i.e. half the compressive stress applied at either end. This value is obtained using the equation for $\sigma_\theta$, ...
Candidium's user avatar
1 vote
1 answer
473 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 ...
Lazarus Jaeger's user avatar
1 vote
1 answer
85 views

Tension and Shear on L-Bracket Offset From Wall

I’m planning to mount a mantle on a brick fireplace wall using two iron L-brackets that are 5” wide and 1/4” thick. Each bracket has four 5/16” mounting holes…two at the top and two at the bottom. The ...
jdchess's user avatar
  • 11
1 vote
1 answer
845 views

Maximum tensile and shear loads on screw

I'm using a screw in an application where I want to have a high degree of confidence the screw will not fail, and I want to be sure I'm calculating the maximum tensile and shear loads it can sustain ...
MattHusz's user avatar
  • 113
1 vote
1 answer
31 views

should the hachures in moment and shear diagram be vertical?

when we plot the shear or moment diagram we add hachures to the area created with these diagrams , in most cases we see vertical hachures, is it represent the internal forces? or its just used to ...
Samir Benabdelaziz's user avatar
1 vote
1 answer
195 views

How to find the reaction at the pinned support A as shown in the picture? [closed]

Please help me solve the problem. I need to know the reactions at A for both the cases as shown. Please note that E is a roller, D is a pin support , B is an internal hinge and A for case 2 is a fixed ...
Share thy thought's user avatar
1 vote
0 answers
232 views

Is Viscosity = Slope?

studying fluid mechanics, I see that viscosity relates shear stress to shear rate, like a slope. However, on graphs I see that they draw a triangle, and where I would expect to see $\Delta \tau $, I ...
RMS's user avatar
  • 275
1 vote
2 answers
293 views

Shear Wall Boundary Element

When can I design a boundary element of a shear wall as a column? Is there a link to a solved example? Help please.
ben asfan's user avatar
1 vote
2 answers
103 views

How can I describe cold work and atomic structure?

A copper wire (42 cm x 0.25 cm diameter) twisted to failure did not change its dimensions significantly. How can I visualize or quantify the cold work done (tensile at the exterior, compressive in the ...
Jim Gaidis's user avatar
1 vote
0 answers
53 views

Shear modulus in terms of 2 Young's moduli and Poisson ratio

I have two moduli, EY and EZ, and the poisson ratio NUYZ, and the equation for the shear modulus that I am using is $G = \frac{EY*EZ}{EY+EZ+2*EY*NUYZ}$ but I am not sure where it comes from. I tried ...
Mikeb's user avatar
  • 19
1 vote
0 answers
15 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 ...
karthikeyan's user avatar
1 vote
0 answers
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 ...
Ryan Larson's user avatar