Hello!
I am new to mechanics of materials and I am very confused about the problem below. So the shear formula is:
tau = VQ/It
From the book (Hibbeler) I understand that Q is "y'A', where A' is the cross-sectional area of the segment that is connected to the beam at the juncture where the...
Hello. I am reading Hibbeler's Mechanics of Materials (ninth edition). Example 7.5 computes shear flow at a segment where there are nails attached to different boards.
He chooses a cut like the one shown here:
And gets (by symmetry between C and C') the shear flow q computing the first moment...
Hello:
I was reading about thin-walled members under shear force, specifically example 7-7 of Hibbeler's Engineering Mechanics, Mechanics of Materials.
First, the fourth Edition:
As you can see above. He starts by computing the moment of inertia on the first equation by subtracting a rectangle...
Dear Everyone：
Q：
Please help me to understand why the torque of external load to the centroid is different from the torque of internal shear flow to the centroid in the asymmetric beam?
Attached please refer to the following link for more details.
Question version
Original version
Thank you...
Hi,
I was thinking about principal stresses and unfortunately this is a bit of a dark spot for me in my education.
I understand principal stresses as the stresses that are present when the co-ordinate system is oriented such that there are no shear stresses, and only normal stresses. As such...
Homework Statement
For QB , why shouldn't the QB = red part only ?
Homework EquationsThe Attempt at a Solution
Is there anything wrong with the solution given ?
Since When we 'cut ' the boards , the b is the red part which in contact with the other board , right ? [/B]
In the figure , we can notice that the moment due to Pe is counterclokwise , but moment due to shear flow is also counterclockwise , How can the Pe prevent the twisting of the beam ?
Or is the direction of the shear flow wrong ? Should it flow from the below to the top ?
Homework Statement
for shear flow at D , the Q = Ay , i tried another method , i gt 30000 , instead of 29750, why the ans is different from 29750? why can't i use this method( i break the shaded area into 3 parts ( as shown in figure)
Homework EquationsThe Attempt at a Solution
Q = Ay =...
Homework Statement
In the notes , I don't understand that flange is thin , and the top and bottom surface are free of stress , can someone help to explain please?
Secondly , why the q' is assumed to be q ' throughout the flange is assumed to be 0 ? why are they stress free ? We could see that...
Homework Statement
I've a problem with defining x function for the lower horizontal bar on the left hand side. Is it shear flow for this part = Vx/Iy * 3 * s^2 * 0.5 (after integration) ? Or should I take whole x part on which is acting force Vx?
Homework EquationsThe Attempt at a Solution
I need help on where i can find the numerical study and a MATLAB code on how to visualize the distribution function and orientation tensor of fibers in simple shear flow for different closures as it is shown in Fig.1 and Fig.2 of the following paper...
Homework Statement
Homework Equations
The moment and shear flow equations
Solved with Matlab
The Attempt at a Solution
I am getting real close to the answer but something is off and I can't figure it out.
The full code (Matlab)
deg = pi/180;
G = 4.e6...
Homework Statement
My problem is how to calculate the Shear Flow Distribution through this open cross-section.
The section has a uniform thickness of 2mm and all other dimensions are on the attached picture.
There is also a 100 kN downwards force applied.
Homework Equations
q(s) =...
Homework Statement
Homework Equations
qs1(0)=qs3(5)
qs2(0)=qs1(5)
qs3(0)=qs2(6)
Vy=0
q(s)=-Vy/Iyy*Q(s)
Where Q(s)=y*A
Where y=y coordinate of centroid and A=Area
The Attempt at a Solution
To be honest I'm not sure how to separate the q(0) term, nor do I know what the...
Im having difficulty figuring this question as their are not enough notes or guides on longitudinal shear on bolts.
Shear flow(q/s) = VQ/I
Yc = 100
I = 3.65 X 10^8 MM^4
Q = Ax Y'
Q = 150 X 25 X 87.5 = 3281250 As analysing shear in the longitudinal which means taken consideration of...
Homework Statement
Assume a shear flow against a wall, given by U= Uo (2y/ax - y^2/((ax)^2) where a is a constant. Derive the velocity component V (x; y) assuming incompressibility.
Homework Equations
Haven't been able to find any in my course notes.
The Attempt at a Solution...
fluid mechanics: defition of "shear flow" [rate of deformation tensor]
I'm studying old undergraduate chemical engineering notes for an exam in grad school. Can't recall what this really means, can anyone explain to me what "off-diagonal elements" means and why the trig function velocities...
Hi guys,
its been awhile since i have been back. Right now, i am involved in some research on aeroacoustics and i have been trying to get some of the basic fundamentals on aerodynamic generation of sounds. Unfortunately most of the online literature do not give much details on the physics of...
I need to find the shear center of the following cross section, but to do so i need to be able to draw the shear flow. Does anyone know how you would draw it for this case and why? It seems to be pretty easy until you get a complex cross section like this.
See cross section here...
Homework Statement
The correct answer is circled.
[PLAIN]http://img80.imageshack.us/img80/976/94926993.jpg
The attempt at a solution
I used the equation q = \frac{VQ}{I}
But for Q = Ay, what is the area? My area was 80 x 20 = 1600 mm^2. However, this gave me the wrong answer.
Question
We have a bent piece of metal subjected to a shear V; we're to sketch the distribution of shear flow along the leg AB. (see attached)
What I've Done So Far
I've tried to determine the second moment of inertia but have failed to produce the same results given in the hints...
Homework Statement
A beam loaded by a central point load deflects a quantity, e.g. d. If an identical beam is laid on top of the first beam and the same loading is applied the deflection drops to d/2. In this loading situation the ends of the beam are not aligned. When the beams are joined...
PLEASE! Shear Flow HELP
We are doing shear flow problems and my instructor has been unable to explain the topic in a general enough way to apply effectively to all problems. Our (my class) difficulty is understanding in the formula q=QV/I where the variable Q=yA' what to use for A'.
It...