Contact Definition and 448 Threads

I have a problem that requires me to do a simple simulation of a sheet metal stamping. I have access to Ansys Workbench v12 Academic version, and have familiarized myself with the program and tried to read up on its features and limitations. The simulation is selected as a static structural...

Before I begin, immediately after I saw my first two sightings and after reporting them to nuforc and mufon, I started refining my experience by writing thoughts down to the best degree humanly possible. Take in consideration, what I saw was not supposed to exist and I am describing how it...

I have calculated the contact stress for a sphere in a socket using formulas provided in Roark's formulas. But my problem is that the sphere is actually in contact with two sockets - upper and lower sides, so there are actually two contact areas. Can I just multiply the contact stress I...

In my attempt to obliterate my ignorance I'd like to discuss something related to the recent news story about a young man who attached two clamps to his nipples and then had a friend plug it into a wall socket. http://news.gather.com/viewArticle.action?articleId=281474978486647" <-- News Story...

I recently made my first blog post on the subject of whether http://reptoavian.blogspot.com/2010/08/alien-contact-forthcoming.html" . Do you agree or disagree with my estimates of the variables in the Drake equation? What do you think of my conclusions for the number and spacing between...

Am I correct in saying that when a torque is applied to a wheel the force is resisted by the friction at the contact patch and then becomes a "equal and opposite" torque acting around the contact patch?

Hello I just moved in with some new people who, I have found out, smoke a lot of weed. Now the internet is full of info about how passive smoking can explain a positive drug test but this is not what I'm interested in. I'm afraid I could get dumber from the passive smoke inhalation. If that's...

When I model a honeycomb type composite in workbench I tired modeling the core material as an orthogonal material type using solid tet elements and the aluminum face sheets as isotropic shell elements. I base the core material properties off of the honeycomb manufactures data for stiffness...

Homework Statement Two objects, in contact with each other, are being pushed across a table. The masses are 113g and 139g. Friction is negligible. The applied horizontal force of magnitude 0.0538N is exerted on the more massive object. Determine the acceleration of the two object system and...

I kitesurf a lot in both fresh water and salt water. I wear well-fitting contact lenses that do not shift around or come out, even if I rub my eyes. In SALT WATER: I can crater from 20 feet in the air with a thunderous crash and get dragged through and tumbled by waves with my eyes open...

Hi everyone, I need to evaluate parameters (heat capacity, density and thermal conductivity) for some very humid air. I know the parameters for both dry air and water vapor. So I suppose the parameters I need will just be a linear combination of the other parameters, with a coefficient...

Homework Statement The following camping van with a total mass of 800 kg is connected at point P to the back of a car. The car accelerates with constant acceleration a during 4 seconds from rest until it achieves 60 km/h. Assuming there is no resistance (from air and ground), calculate the...

Homework Statement Two crates, of mass 75 kg and 110 kg are in contact and at rest on a horizontal surface. A 620N force is exerted on the 75 kg crate. If the coefficient of kinetic friction is 0.15 calculate: a) the acceleration of the system b)the force that each crate exerts on the...

What does it mean for the contact between two surfaces to be "perfectly rough"?

When a metal sphere, A, with a charge of +5q is touched to a sphere,B, with a charge of -q what would each of the spheres charge would be and what would there the circle view of the final sphere? thanks

Homework Statement SO3 is not absorbed in water directly to form sulfuric acid because A. Reaction doesn't go to completion B. Reaction is slow. C. Highly exothermic. D. Insoluble Homework Equations -------------- The Attempt at a Solution MY...

I recently applied to some grad schools for a PhD program and I was notified by one particular school that while my marks were under their admission requirements, they recognize that I have valuable background experience which may allow me to succeed and that they would circulate my file to...

1. A student who's standing still on level ground weights 570 N and is wearing a backpack that is 81 N. a) What's the magnitude of net force on the student? b) What's the magnitude of the contact force on the student by the backpack? c) What's the magnitude of the contact foce on the...

Two blocks of masses m1 = 4.00 kg and m2 = 3.00 kg are placed in contact with each other on a frictionless horizontal surface. A constant force F = 9.00 N is applied to the block of mass m1. a) Determine the magnitude of the acceleration of the two-block system. b) Determine the magnitude of...

Hello all, Just thought I would throw this one out there. Who preferes to use the RBE3 command to automatically create a set of constraint equations and who prefers to use the Contact Wizard? I used to use the Contact Wizard but I recently got burned by it, so I switched to using the...

Hi, i want to make automatic on/off the pump with float switch for my tank with contactor(with auxillary contact) i have, 1. contactor with auxillary contacts 2. Float switch 3. Manual On/Off switch for pump i want the connection details according to attached diagram. Thanks.

Hi all, I am designing a set of side guide rollers for a vertical gate. There are four rollers on the gate (two on each side), and the rollers are designed for jamming load condition (they are not loaded most of the time). When jamming happens, one top roller and one bottom roller (on the...

Is there a video of that kind of scenario floating around youtube? Have not had any luck finding a video of such a scenario.

How does contact angle change with temperature and why? Does capillary rise have a temperature dependence?

So, I've been wondering. Anyone know what shape/prescription a contact lens would have to be in order for an eye to be able to focus on something 1mm away (assuming the distance of focus in the eye is around 4 cm)? Does it have to do with focal length of the lens?

Homework Statement A ball falls on the surface from 10m height and rebounds to 2.5m.If duration of contact with floor is 0.01 sec,then average acceleration during contact is- g = 10m/s^2 Homework Equations \alpha = \frac{v_2 + v_1}{t} The Attempt at a Solution Now here v_{1}...

Homework Statement A nano particle consisting of four iron atoms (object 1) initially has 1 quantum of energy. It is brought into contact with another nano particle, consisting of two iron atoms (object 2), which has 2 quanta of energy. The mass of one mole of iron is 56 gram. a...

Homework Statement Three crates are arranged. Their masses are m1=29.8, m2= 15.3, m3= 27.3. The applied force of 910 N is directed horizontally and the coefficient of friction is u= .277 WHAT IS THE MAGNITUDE OF THE CONTACT FORCE BETWEEN M1 and M2? WHAT IS THE MAGNITUDE OF THE CONTACT...

1. A nearsighted person wears contacts with a focal length of -7.6cm. If this person's far point distance with her glasses is 8.7m, what is her uncorrected far point distance? 2. 1/F=1/do+1/di 3. 1/-7.6=1/do+1/870 =-7.534 I am completely lost here...please help. Thanks!

Homework Statement A handball of mass 668 grams is thrown straight against a wall with a speed of 13.36 m/s. It rebounds straight back out with the same speed. The average force exerted on the wall by the ball is 12 N. How long is the ball in contact with the wall? Homework Equations...

blocks A and B have weights of 45 N and 25 N, respectively. block A is sitting on a table and block B is attached to block A by a piece of string on a frictionless pulley and block B is hanging off the table. also block C is on top of block A Figure 6-48 (a) Determine the...

im studying for an exam and this question came up anyone know what happens?

Hi all, I am trying to calculate the the torque of a system which uses various size wheels to transfer power. Explained: A motor, of 100Nm torque, 40000 rpm, has a shaft of 7mm diameter in contact with a wheel 20mm in diameter. This wheel is in contact with a 15mm wheel. I need to...

How are you? I was conceptualizing some objects and found a particular base concept. I need help finishing it. Contact me at TDYOUNG24@HOTMAIL.COM thank you

I've looked everywhere to find how do you calculate contact forces, like if you were pushing boxes. Don't want the answer just need to know how to do the calculations.

A tennis ball has a mass of 0.057 kg. A professional tennis player hits the ball hard enough to give it a speed of 44 m/s (about 99 miles per hour.) The ball moves toward the left, hits a wall and bounces straight back to the right with almost the same speed (44 m/s). As indicated in the diagram...

Hi all May be someone can help me with this problem. There is a isa-chrome60 wire (d=0.5 mm, tensile strength=600 N/mm^2) which is held at both ends using end connectors ( length of the wire = 20mm). And there is a nylon wire (d=0.5 mm) which is under tension (because of torsion spring)...

Homework Statement A hot body is brought into contact with a colder body until their temperatures are the same. Assume that no other bodies are around. 1.Is the heat lost by one body equal to the hear gained by the other? 2.Is the temp drop of one body equal to the temp increase of the...

one of the laws of friction states that the frictional force is independent of the area of contact,and velocity,how true is this? my book says this particular law is only approximately true.

Hello there my fellow physics fans! I have decided to enter a national science competition in my potato obsessed homeland of Ireland called the "BT Young Scientist Awards". I am simply looking for clarification of the uniqueness of my project concept: I am planning on creating equations...

Homework Statement "Three blocks (m1, m2 and m3) are in contact with each other on a frictionless, horizontal surface. A horizontal force is applied to m1. http://i4.photobucket.com/albums/y111/kathy_felldown/sb-pic0556.png What is the net force on block 1 and block 2? What is the...

I'm currently programming a 2D rigid body dynamics engine. While I have realistic collision detection and response between polygons, I have trouble in the simulation once I implement gravity. When these rigid bodies are influenced by gravity, they never fall to complete rest (e.g. they...

Hello everybody: It is known that point contact diodes were an antecedent of PN junction diodes. I have read that they got their rectification properties from the fact that the metal in the point doped the semiconductor and formed a PN junction. However, it is known that you can rectify with...

Hi, I was wondering about the following. A friend (biologist) once told me that looking a cat in the eyes shows aggression, whereas making eye contact with a dog creates a kind of connection or bond. However, a quick Google search seems to indicate that also in canines, direct eye contact is...

Hello, I am a senior and am planning to go to a physics gradschool. Looking at several forums and tips online, I came to know that it is good to contact faculty members of prospective gradschool. But I am not sure how to start the conversation, like what to talk about and how. What should i...

Hello guys! Is there anyone who knows where i can find information about maximum allowed Hertzian contact stress for material SS-2244 / AISI-SAE 4140 or any similar material quality? I have been searching for this information in several Swedish books and material tables, without success.

Homework Statement Anne is farsighted; the nearest object she can see clearly without corrective lenses is 2.4 m away. It is 1.8 cm from the lens of her eye to the retina. What should the focal length of her contact lenses be so that she can see clearly objects as close as 24.0 cm from...

Homework Statement Aluminium contacts {100} p-doped silicon (10ohm/square) which has been implanted into a 200mm wafer (1 mm thick) by 100keV phosphorus at 7X10^15. What will be the resistance of a 1um^2 contact and will it be ohmic? Homework Equations Rc = Pc/A The Attempt at a...

Hi In the band diagram of an ideal Metal Semiconductor contact with \Phi_{M} < \Phi_{S} (work function of metal < work function of semiconductor) and a p-type semiconductor, why does the Fermi Level intersect the Intrinsic level right at the metallurgical junction? Thanks.

Homework Statement Two packages at UPS start sliding down the 20° ramp shown in Figure P8.25. Package A has a mass of 5.0 kg and a *coefficient of friction of 0.20. Package B has a mass of 10 kg and a coefficient of friction of 0.15. How long does it take package A to reach the bottom? I...