I am looking for help on equipment needed for ultrasonic testing, or ultrasonic nanoscopes from those who currently have access to such an equipment, own it, or have used it. Thanks a lot! lbliaoReturn to Top
Does anyone out there know the formula to derive the section modulus for pipe? At work, all our benders are rated at section modulus, say 3.5, for schedule 80 steel pipe. Our problem is we deal with a lot of stainless steel, some schedule 160, some T11, T91, etc. and don't know what the section modulus for those are. Any help would be greatly appreciated. ShaneReturn to Top
Hi, I need some advice on how to model a screw with a constant pitch through the whole length. I'll be using either Microstation 95 or Autocad 13. If any one has any suggestions or blocks(cells), please send over. Thanks! BG bg@scs.unr.eduReturn to Top
:Anybody here know how to make a mouse trap car without elastic
^^^^^^^^^^^^^^^
Is that the only constraint? Pondering a model airplane engine
perched on a little slab of wood...
--
george
george@mech.seas.upenn.edu
Return to TopAnybody here know how to make a mouse trap car without elastic ThanxReturn to Top
Don, Perhaps fluorescent dye penetrant testing would work for you. _woody_ DF Roell wrote: > > I am looking for a technique to quickly and easily identify hairline > fractures and cracks in large steel and chrome cylinders. ...snip... > ========================================================== > Don Roell 3M Company | Opinions expressed are mine and > 612 778 4445 (office)| are not to be construed as my > 612 778 6051 (fax)| employer's, so please treat them > dfroell@mmm.com (email)| accordingly > ========================================================== > 3M Center Bldg 99-2 > St Paul, MN 55144-1000 > ========================================================== -- de Woody (WB4QXE) - woody.white@worldnet.att.net Electron Microscopist/Microanalysist, Ham radio "homebrewer", shade tree mechanic, '90 Nissan 240SX, wish still had my Mcycle too! http://www.geocities.com/capecanaveral/3722 .Return to Top
Hong Pan wrote: > > Hi, > > Could you help me to find some mechanical properties of silicon? > > I couldn't find the allowablw stress and strain in all orientations. > > Many thanks in advance. > ---------------------------------------------------- > Hong Pan > E-mail: panh@bacchus.eng.temple.edu Materials handbook for Hybrid Micro Electronics (Artech House pub)lists the ultimate tensile strength for silicon as 9,046psi for polycrystalline bar and >500,000psi for small diameter wiskers. For single crystal samples they give 26,800psi. One note mentions this: "The the maximum breaking strength is determined by the sizes and distribution of flaws present in the material. The flaw distribution is a strong function of the volume. Smaller samples will have a narrow distribution of smaller flaws and therefore will be inherently stronger." References are provided but I don't have the book with me. -- Ideas or opinions expressed here are not those of my employer. (Mr) Dana Patelzick PE VND System Integration Lab, Tektronix Inc. email:dana.patelzick@tek.com phone:503.627.6352Return to Top
There are lots of helpful stuff from MARC's home page. check out: www.marc.com good luck!Return to Top
There are lots of helpful stuff from MARC's home page. check out: www.marc.com good luck!Return to Top
Right. When I graduated from Syracuse with a degree in Aerospace
Engineering, there WAS no EIT to take in Aerospace Engineering. No jobs,
either. Now I call myself a Mechanical Engineer (there's not much
difference, anyway), and work as a consultant designing mostly automation
machinery, a fairly narrow area of mechanical engineering. I don't think
that spending months cramming for a PE exam would make me a better
engineer..... and apparently none of my customers care, either, as nobody
has asked. In fact, most of the PE's I've worked with tend to be good on
the theory, and rather short on practicality.
-Dana
Return to Top
Right. When I graduated from Syracuse with a degree in Aerospace
Engineering, there WAS no EIT to take in Aerospace Engineering. No jobs,
either. Now I call myself a Mechanical Engineer (there's not much
difference, anyway), and work as a consultant designing mostly automation
machinery, a fairly narrow area of mechanical engineering. I don't think
that spending months cramming for a PE exam would make me a better
engineer..... and apparently none of my customers care, either, as nobody
has asked. In fact, most of the PE's I've worked with tend to be good on
the theory, and rather short on practicality.
-Dana
Return to TopCheck out the MARC homepage at: www.marc.comReturn to Top
C&R; Technologies has an immediate opening for an engineering/programmer to
support development advanced versions of our SINDA/FLUINT thermal/hydraulic
network analyzer.
Job Description ------------------------------------------------------------
Primary job responsibilities are the expansion of the existing SINDA/FLUINT
code (written in Fortran and C/C++) to include noncondensible gas dissolution/
evolution and full nonequilibrium two-phase duct flow.
Secondary activities include customer support and training, consulting,
validation/verification, and user documentation support.
ESSENTIAL: - BS in engineering, especially mechanical or chemical
- 5+ years work experience
- extensive knowledge of hydraulics and pipe flow
- extensive experience in numerical analysis programming
using Fortran, C or C++
- strong work ethic: self-motivating and self-supervising
- strong English communications skills
PLUSES: - MS in engineering, especially mechanical or chemical
- 10+ years work experience
- knowledge of two-phase flow and mixture thermodynamics
- experience using SINDA/FLUINT
- programming experience in C and/or C++
- usage/programming experience in automated design optimization
- usage/programming experience in 2D/3D CFD
- foreign languages
Company Information --------------------------------------------------------
C&R; Technologies is a rapidly expanding engineering software and consulting
company located near Denver, Colorado. Our specialties are heat transfer and
fluid flow system design and analysis. For more details on our existing
software products, see http://www.webcom.com/crtech
----------------------------------------------------------------------------
Please e-mail or snail-mail resumes WITH REFERENCES to:
C&R; Technologies
Attn: Personnel
49 Dawn Heath Circle
Littleton CO 80127
crtech@netcom.com Please put "Attn: Personnel" in the subject.
Text, Postscript, FrameMaker preferred.
Word, AmiPro, HTML accepted.
If you have sent us your resume previously, please send a fresh copy
referencing the current job opening: "FLUINT Programmer."
--
_______
_____ \| \\
// \| || || Cullimore and Ring Technologies, Inc.
|| | ||___// 49 Dawn Heath Circle
|| || \\ Littleton Colorado 80127-4303
|| || \\ (303) 971-0292 crtech@netcom.com
\\ || \\ http://www.webcom.com/crtech >
========================================================================== >
Thermal/Fluid System Design and Analysis >
Return to TopI am looking for help on equipment needed for ultrasonic testing, or ultrasonic nanoscopes from those who currently have access to such an equipment, own it, or have used it. Thanks a lot! lbliaoReturn to Top
I need to know if there is a place I can write an obtain a copy of C.E. specifications. Thanks. E-mail me please.Return to Top
Innovative Solutions & Support, located in Great Valley Pa, (greater Philadelphia area), is a rapidly expanding diversified Avionics supplier to Civil, Military, Business and Commercial OEMs. We are seeking good people with hands-on design and development experience to join our growing professional team. The most successful employees at ISS are versatile in their experience and capabilities, and enjoy learning new technologies. BSEE or BSME is required for all positions. In return for your expertise, we offer a work environment that recognizes and supports your professional status. In addition to competitive compensation, we also offer very attractive benefits. If you want to push your technical and career growth forward, join us at Innovative Solutions & Support. SR. MECHANICAL ENGINEER (job 30011) Must have 5+ years experience in mechanical design working with metal, plastic, and high density packaging. Experience in aircraft industry, designing to military specifications, display lighting (ANVIS), and environmental testing is a plus. Must have CAD experience, Pro/E preferred. Excellent opportunity for a strong hands on individual contributor. SYSTEM ENGINEER (Flight Control Systems) (job 40045) Must have experience with flight control systems such as autopilot or air data systems. Experience in design and development of interfaces for aircraft instrumentation at the system level. Knowledge of Mil 1553, RS422, AIRINC 429. Excellent opportunity to be a technical leader. MECHANICAL DESIGNER (job 30012) Must have 2+ years experience in mechanical design and use of Pro/E or related CAD system. Please contact: T. Williams Inc., PO Box 337, Dept. SM-115, Collegeville Pa 19426. E-mail: twilliams@p3.net, fax: 610-489-4646. -- Rich Cialone rcialone@openix.comReturn to Top
MB>I am looking for some source code that will compute the MB>stiffness matrix for a full 3D beam finite element. It's easy to figure, especially since you have the 2D equations already. You'll have six degrees of freedom, so it'll be a 6x6 matrix rather than a 4x4 matrix. To determine the extra terms, You'll need to calculate an out-of-plane area moment of inertia and shear area. Use the same equations for in-plane bending and substitute the correct degrees of freedom and out-of-plane properties. ------------------------------------------------------------------ Bill Weitze, PE: Co-Sysop, The Engineers' Club BBS, (408) 265-3353, San Jose, CA Executive Committee Member, ASME Santa Clara Valley Senior Engineer, GE Nuclear Energy bill.weitze@engineers.com opinions are mine ------------------------------------------------------------------ * OLX 2.2 * You're known by your mistakes.Return to Top
In article <327FE5D8.56BA@compuserve.com>, Dana Hague <75551.1514@compuserve.com> wrote: >Right. When I graduated from Syracuse with a degree in Aerospace >Engineering, there WAS no EIT to take in Aerospace Engineering. No jobs, >either. Now I call myself a Mechanical Engineer (there's not much >difference, anyway), and work as a consultant designing mostly automation >machinery, a fairly narrow area of mechanical engineering. I don't think >that spending months cramming for a PE exam would make me a better >engineer..... and apparently none of my customers care, either, as nobody >has asked. In fact, most of the PE's I've worked with tend to be good on >the theory, and rather short on practicality. > > -Dana That's nice. However, practicing consulting engineering without a PE is illegal in most states. Calling yourself a ME may also by illegal in some states. You must be registered to sell engineering services to the public as an engineer unless you are covered by the Industrial Exemption. Frankly, all that we seem to hear from unlicensed (and in this case illegally practicing) engineers are snide comments concerning a supposed lack of compentance by PEs. As far as no EIT in AE - At least currently, there are no seperate discipline FE exams - it's all one test. I would take it immediately if you plan on continueing to practice as a consulting engineer. Just because a patient doesn't ask if a doctor is properly licensed to practice medicine, assuming the medical degree is enough, your customers have yet to ask you about your professional registration. My opinion may seem harsh, but engineers such as yourself are working outside the system of professional regulation that is designed to regulate our profession. I take it pretty seriously. Dan Golding, EITReturn to Top
Brad Lindseth (lindseth@telusplanet.net) wrote: : Anybody here know how to make a mouse trap car without elastic What do you mean by "without elastic". A normal mouse trap car uses the spring for energy storage. My kids did them for school, but the mouse trap wasn't on the car - just served as a launch device so that the car mass was minimised.Return to Top
Hi ! I am a student at UNB Fredericton, NB. I would be interested in purchasing the full set of Release 9 ASM Handbooks. If anyone has a set for sale, please get in touch with me ASAP. Thanking you. Sincerely, S. R. Pundale. --- *********************************************************************** Shailendra Pundale Dept. of Mechanical Engineering. email: v6tr@unb.ca University of New Brunswick, Tel:(O) (506) 453-4513 x 7779 P.O. Box- 4400, Fredericton,NB. (R) (506) 450 AMOL E3B 5A3 Canada. Fax: (506) 453 5025 **********************************************************************Return to Top
This is a multi-part message in MIME format. ------=_NextPart_000_01BBCB6A.855F2E40 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit I am interested in finding information on current industry salary levels for mechanical engineers based on experience, degree, and geographic region. Desire information that is compiled in a format such as bell curves to determine salary statistics based on the stated factors. Thank you any help in gathering this information. Todd ------=_NextPart_000_01BBCB6A.855F2E40 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printableReturn to TopI am interested in finding information = on current industry salary levels for mechanical engineers based on = experience, degree, and geographic region. Desire information that = is compiled in a format such as bell curves to determine salary = statistics based on the stated factors. Thank you any help in = gathering this information.
------=_NextPart_000_01BBCB6A.855F2E40--
Todd
A tiny silver-plated conical cup in which sits a light-emitting semiconducting
die is to be filled with a liquid chemical (which will blend well with epoxy)
such that no air voids or bubbles are present in the cup.
As 300 of such cups need to be simultaneously filled, the most convenient way
(or so it seems) is to VERTICALLY immerse the cups into a solution bath as
shown below.
The trouble is that such an action will inevitably trap air bubbles in the
cups unless:
(a) a liquid solution with a good wetting capability is used; or
(b) the liquid solution is agitated w.r.t. the cups in a suitable way.
Even after having experimented extensively with (a) and (b), I have not
found anything remotely reliable.
Any help will be greatly appreciated.
Please email responses to: alan@hpmalr90.mal.hp.com
Thanks.
Alan Phang
|~|
| |
| |
| |
| |
| |
| |
| |
| |
| | Metal Lead (Silver-plated)
| |
|_|
/ * \
/ \ Silver-plated hollow cup in which
/_______\ sits a 10 mil x 10 mil semiconducting
die indicated by the asterisk (*).
55 mil
|<------->|
| |
|_________________________________________________|
| - - |
| - - - - - |
| - - |
| - Chemical Solution - |
| - |
| - - - |
| - - - - |
| - - - |
( - - - - - )
\_________________________________________________/
Return to TopHi.. Has anyone had any good or bad experiences using the PDEase2D finite element software from Macsyma Inc.? I am planning to use this software under Windows NT for nonlinear problems of solid mechanics coupled with stress-strain dependent transient heat-mass transfer. I am wondering just about its "nonlinear capabilities", in particular, could it serve well for elastoplastic problems with deformational Ramberg-Osgood like plasticity (small strains)? How reliable is this software? In general: Are there any problems with this software that I must be aware of? How friendly and easy to use is it? What should I expect from the package? I would appreciate every comment, suggestion, idea.. --------------------------------------------------------------- Victor Kharin ETSI Caminos tel: +34-81-131150, ext. 450 Campus de Elvina fax: +34-81-132876 15192 La Coruna E-mail: kharin@udc.es SPAIN ---------------------------------------------------------------Return to Top
I am looking for information about solder accelereted ageing, but I would like an answer from the mechanics point of view. If you cannot answer the following questions, please give me references which could help me : * what comparision can be made between two identical samples (that is same geometry and same alloy composition) which have undergone two different thermal loadings but whose stress-strain hysteresis curves have the same area? * in particular, can we assess that these two samples are at the same state of their lifetime and at the same degree of fatigue? Thanks, Jean-Marc THEBAUD PhD studendReturn to Top