q**j
发帖数: 10612 | 1 我承认自己后知后觉，又看了看菲利猫的长贴才看明白问题。
From wiki:
The yield strength or yield point of a material is defined in engineering
and materials science as the stress at which a material begins to deform
plastically. 代号Re
Tensile strength measures the force required to pull something such as rope,
wire, or a structural beam to the point where it breaks. wiki equals ts to
ultimate strength. (seems to me anyway).代号Rm。
ys 就是发生不可逆转的形变的力量。ts 就是要这个钢材必须断裂的力量。注意ts要求
用力是顺着这个钢材的方向。wiki没说ys是按照钢棍哪个方向拉。但是有图比较ys和ts
。我想应该也是往长的拉... 阅读全帖 |
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h**********r
发帖数: 2284 | 2 I actually looked at the news as you mentioned. Seems the main reason for
the Lexus to catch fire was that the car rolled over a few times before
coming to a stop - not because of the collision with the Ford. But you're
right in that it's the fire that killed the people given they couldn't
escape due to the car's deformation after the rolling over.
This accident seems to be an isolated case though.
http://www.justicenewsflash.com/2009/09/01/runaway-lexus-kills-
Lexus |
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l*********u
发帖数: 19053 | 3 re
大而重就是安全，最基本物理定律。只有日托才硬拗。
1 How do a vehicle’s size and weight affect safety?
All other things being equal, occupants in a bigger, heavier vehicle are
better protected than those in a smaller, lighter vehicle. Both size and
weight affect the forces people inside a vehicle experience during a crash.
The magnitude of those forces is directly related to the risk of injury.
In the case of size, the longer distance from the front of the vehicle
to the occupant compartment gives a bigger veh... 阅读全帖 |
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S*******n
发帖数: 10009 | 4 Rollover 101
How rollovers happen and what you can do to avoid one
http://consumerreports.org/cro/2012/02/rollover-101/index.htm
How rollovers happen. Given the right circumstances, any vehicle can roll
over. However, taller, narrower vehicles such as SUVs, pickups, and vans are
more susceptible than traditional cars are because they have a higher
center of gravity and thus are more top-heavy. Sideways forces that develop
when a vehicle rounds a curve shifts the center of gravity to one side,
wh... 阅读全帖 |
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a******o
发帖数: 16625 | 5 丰田UR系列发动机每一个型号都很牛逼
Toyota UR engine
From Wikipedia, the free encyclopedia
Toyota UR engine
Toyota 1UR-FSE Engine.JPG
Overview
Manufacturer Toyota Motor Corporation
Production 2006–
Combustion chamber
Configuration DOHC 90° V8
Chronology
Predecessor Toyota UZ engine
The Toyota UR engine family is a 32-valve quad-camshaft V8 piston engine
series which was first introduced in 2006 as the UZ series it replaced began
phasing out. Production started with the 1UR-FSE engine with D4-S di... 阅读全帖 |
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m***m
发帖数: 1158 | 6 Houston tx i610 west section driving north. During transferring to 59 on the
way to Chinatown
The traffic suddenly slowed down. I braked immediately and felt I almost
hitted the front car. At the moment of feeling lucky I heard a bang then
another bang. Then the whole family in my expedition relalized somebody
hitted us twice. Six people aboard. Younger son woke up time was 3:20 march
8. Women's day
My hands were shaking as my wife described afterwards my truck completely
stopped I was thi... 阅读全帖 |
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Y****a
发帖数: 17170 | 7
那只能说明你们的车的手册写的不够好。
我的车是subaru forester xt，手册虽然说按照门上的气压充，但是也强调需要根据气
温矫正。
这是截图（我上个回复还记错了，－10C的时候需要到38psi）
实际上冬天shipping的 forester，出厂的气压都是40psi左右。
另外，我的车的手册还说：
Driving at high speeds with exces- sively low tire pressures can cause the
tires to deform severely and to rapidly become hot. A sharp in- crease in
temperature could cause tread separation, and destruction of the tires. The
resulting loss of vehicle control could lead to an accident.
也就是说胎压过低是很危险的。 你要是不分青红皂白的按照门上充气，有可能会造成
气压不足，从而造成危险。
相反多充... 阅读全帖 |
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r********o
发帖数: 1423 | 8 If it contributes to the energy absorption, then yes, it does help.
Like composite cars made for racing, instead of using metal frames that
deform(buckling) to absorb the impact energy, composite frame is made to
fracture to absorb the impact energy. That's why you can see the race cars
can be completely destroyed when it hits the race fence, but the driver
inside can still survive.
Bricks, if attached out side of the car frame, and fracture during the
impact, will function as a buffering zone t... 阅读全帖 |
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h**********r
发帖数: 2284 | 9 he he.
The problem is that I just don't think DFBB can hold up a cow like that.
Some part of the hood will be deformed for sure. I own some Jap car and some
German cars and I know the difference. |
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A***n
发帖数: 8859 | 10 一切都是有原因的
Mazda5 and Nissan Leaf lose their Consumer Reports recommendation
Four small cars earn the lowest rating in latest insurance industry crash
test
Published: July 30, 2014 12:01 AM
Mazda5
Photo: IIHS
Only one among a dozen small cars earned a Good score in the latest crash
tests conducted by the Insurance Institute for Highway Safety (IIHS): the
Mini Cooper Countryman. Four others—Fiat 500L, Mazda5, Nissan Juke, and
Nissan Leaf— earned the lowest score of Poor.
As a result, Consumer Repor... 阅读全帖 |
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d***e
发帖数: 3497 | 11 碰撞都是IIHS测试Good的车，一大一小，小的惨不忍睹
https://www.youtube.com/watch?v=ExQUGk12S8U
Safety consequences of vehicle size and weight
All other things being equal, occupants in a bigger, heavier vehicle are
better protected than those in a smaller, lighter vehicle. Both size and
weight affect the forces people inside a vehicle experience during a crash.
The magnitude of those forces is directly related to the risk of injury.
In the case of size, the longer distance from the front of the vehicle to
the occupan... 阅读全帖 |
|
W***n
发帖数: 11530 | 12 as long as the integrity of the oil pan is intact (deformed but no cracks)
no need to change |
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s*****e
发帖数: 893 | 13 http://www.iihs.org/iihs/ratings/ratings-info/frontal-crash-tes
Most modern cars have safety cages encapsulating the occupant compartment
and built to withstand head-on collisions and moderate overlap frontal
crashes with little deformation. At the same time, crush zones help manage
crash energy to reduce forces on the occupant compartment. The main crush-
zone structures are concentrated in the middle 50 percent of the front end.
When a crash involves these structures, the occupant compartment ... 阅读全帖 |
|
发帖数: 1 | 14 Freaking Toyota cheap plastic deforms all the time |
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x****u
发帖数: 12955 | 15
That doesn't say much. Cars are designed to not deform on side impact, but
crumple on frontal impact. So you could say both are doing what it is
designed to do. We need another incident where the Volvo hits the Toyota on
the side to properly determine which is better. |
|
x****u
发帖数: 12955 | 16
That doesn't say much. Cars are designed to not deform on side impact, but
crumple on frontal impact. So you could say both are doing what it is
designed to do. We need another incident where the Volvo hits the Toyota on
the side to properly determine which is better. |
|
n***s
发帖数: 10056 | 17 Yes, rim is deformed but tire should actually be ok. |
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n***s
发帖数: 10056 | 18 Viofo A119 w GPS。 Make sure it's Viofo brand. Video quality and build
quality are very good. It works normal under Florida hot summer. My other
brand cam deformed under windshield heat. |
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n***s
发帖数: 10056 | 19 Body shop will do multipoint frame alignment check (if you let them do
repair) to make sure frame is not deformed.
Just tell them after impact, it drives funny. |
|
发帖数: 1 | 20 1 PhD position in Multiscale Modeling of Materials at San Diego State
University, California, USA
1 PhD position with starting date in mid August 2018 is available in the
Multiscale Modeling of Materials (M3) group at the department of Mechanical
Engineering (ME) at San Diego State University (SDSU), California, USA,
under the supervision of Dr. Wenwu Xu https://www.m3sdsu.com/ and a co-
advisor at University of California, San Diego. This position covers tuition
fee and provides $21,500/yr of... 阅读全帖 |
|
g**0
发帖数: 215 | 21 Publications in Refereed Journals:
J. Kim, T. Panitanarak, and S.M. Shontz, A multiobjective mesh
optimization framework for mesh quality improvement and mesh untangling,
International Journal for Numerical Methods in Engineering, Accepted,
September 2012.
P. Kitanov, O. Marcotte, W. Schilders, and S.M. Shontz, A vertex cut
algorithm for model order reduction of parasitic resistive networks, COMPEL:
The International Journal for Computation and Mathematics in Electrical and
Electronic En... 阅读全帖 |
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l**********1
发帖数: 5204 | 22 >6 first author Top journal of that field papers,
one example, Julia R GREER
before 2008 Jan 1st her publications record:
2007
Greer, J.R., George, S., and Herbert, E.
Effective Use of Focused Ion Beam in Investigating Fundamental Mechanical
Properties of Metals at the Sub-Micron Scale
Proc. Mat. Res. Soc., 893E, 1, 2007
Greer, J.R. and Street, R. A.
Mechanical Characterization of Solution-Derived Nanoparticle Silver Ink Thin
Films
J. Appl. Phys., 101 (10), 103529 (2007)
Nix, W.D., Greer, J... 阅读全帖 |
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m****1
发帖数: 736 | 23 http://www.nae.edu/Projects/MediaRoom/20095/130169/130172.aspx
New Members
Atwater Jr., Harry A., Howard Hughes Professor of Applied Physics and
Materials Science, California Institute of Technology, Pasadena. For
contributions to plasmonics.
Balakrishnan, Hari, professor of computer science, Massachusetts Institute
of Technology, Cambridge. For contributions to wired and wireless networks
and distributed systems.
Bardasz, Ewa A., president, ZUAL Associates Consulting, Mentor, Ohio. For
novel au... 阅读全帖 |
|
发帖数: 1 | 24 Academic Position
Harvard University Rowland; Junior Fellow/Principal Investigator 09/2011 –
Present
University of California, Los Angeles; Postdoctoral Scholar (PI: Dino Di
Carlo Ph.D.) 06/2011 – 08/2011
Education and Training
University of California, Los Angeles Mechanical Engineering Ph.D. 2011
University of California, Los Angeles Mechanical Engineering M.S. 2007
University of California, Los Angeles Mechanical and Aerospace Engineering B
.S. 2005
Publication
13. Dwayne A. L. Vickers, Mengx... 阅读全帖 |
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K****D
发帖数: 30533 | 25 Even the cat head theory doesn't work any more, //sigh...
Now DOW looks like a deformed cat. |
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d***a
发帖数: 73 | 26 Please reply to mailbox for further inquiry/Referral.
Please Note job opening is for PHD RCG (18 month prior or post graduation
date) only. Candidates with chem, polymer, materials science background are
encouraged
to apply.
Description
Job Description: Packaging Engineers provide package development and
sustaining support for integrated circuit or semiconductor assemblies,
various other electronic components and/or completed units. Conducts tests
and research on basic materials and properties. ... 阅读全帖 |
|
h****g
发帖数: 74 | 27 如题，如果你想找有限元的工作，请发简历到h****************[email protected]
我会forward你的简历，他们公司pay的还可以。要求如下(可以适当放宽）：
Highly Desired:
• Requires an accredited engineering MS or PhD degree (typically
Mechanical) or equivalent industrial experience and good working knowledge
of numerical simulation software tools including structural analysis, but
not limited to.
• Incumbents have usually gained 2 to 5 years of industry experiences
or gained Ph.D in the area of nonlinear structural analysis area.
• The perso... 阅读全帖 |
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m*******9
发帖数: 77 | 28 Ph.D. in Mechanical Engineering
Publish with Majia ID. Not good grammar, don't blame.
Good luck to all who are hunting jobs!!!
Since Oct 2011;
There are many calls last for less than 1 minutes. Usually started with the
question: are you US citizen?
GrafTech:
Do you need Visa Sponsorship?
Over
Belcan Engineering: Materials analyst
introduce/go through your resume.
introduce xp in simulation with a specific software. what level is that?
5 year plan.
Owen's Corning: Development program
Round ... 阅读全帖 |
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m******3
发帖数: 983 | 29 Component Packaging Engineer
Job Number: 45900366
Job Summary
We are looking for a self-motivated individual who is proficient in FEM
simulation with multi-year hands-on experience of FEM software ASNSY or
ABAQUS. The individual should also be an expert programer of numerical
simulation tools, such as Matlab and Python.
Description
• Numerical modeling of the stress and deformation of component
packages to provide comprehensive understanding of chip-package interaction
and package-board in... 阅读全帖 |
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m********u
发帖数: 3942 | 30 急需~~ PhD两三年经验就可以，地点Santa Clara， 有兴趣请站内或者邮
件 [email protected]
Responsibilities:
We are recruiting highly qualified Scientists/Algorithm Engineers into the
Core Technology Team, to help in the continued expansion of our technology
in AR technologies. We are looking for intelligent, enthusiastic engineers,
with MS or PhD degree and background in computer vision, ideally with a
strong focus on image processing, AI, 3D processing, computer geometry.
Excellent software engineering ability is vit... 阅读全帖 |
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m********u
发帖数: 3942 | 31 地点硅谷，站内或者邮件 [email protected]
Qualifications
Working experiences with virtual fitting room project is a big plus
BS with 2+ years experiences in unity 3D, Unreal, or other 3D
game engine development experience
Extensive experience with Unity3D development for iOS and Android deployment
Background: Expertise in AR, 3D processing, computer graphics and computer
vision techniques
Experience development mobile features (push, geolocation, sensors, etc.)
Experience with projects of 3D point cl... 阅读全帖 |
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w******d
发帖数: 279 | 32 A professor in Mechanical Engineering of Wayne State University is seeeking
a PhD student for
his research group.
The candidate should have a Master degree with any backgrounds in
metallurgy, polymer science, mechanical engineering, mechanics (theoretical
and experimental), solid physics, microstructure and deformation,
thermomechanical processing.
The candidates can be from departments of ME, ChE/MSE, ECE etc,ideally in
US right now.
Anybody interested can send the resume TO d****[email protected] |
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d***a
发帖数: 73 | 33 Please Note job opening is for PHD RCG (18 month prior or post graduation
date) only.
Candidates with chem, polymer, materials science background are encouraged
to apply.
Please reply to mailbox for further inquiry.
Senior Packaging Engineer
Description
Job Description: Packaging Engineers provide package development and
sustaining support for integrated circuit or semiconductor assemblies,
various other electronic components and/or completed units. Conducts tests
and research on basic materials... 阅读全帖 |
|
j*******u
发帖数: 134 | 34 Institute for Infocomm Research, Agency for Science, Technology and Research
, Singapore
Computer Vision & Image Understanding Department
Position: Scientist, Ref No.: I2R/R/05072011/230711/02
Job scope: You will work with other team members to develop algorithms and
systems in computer vision (3D surface reconstruction and multiple-camera
vision system), pattern classification/machine learning, and medical imaging
, especially deformable model-based segmentation/registration.
Qualification: A P... 阅读全帖 |
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m****s
发帖数: 18160 | 35 【 以下文字转载自 ME 讨论区 】
发信人: Doodoowu (awoo), 信区: ME
标 题: Computational Mechanics R&D Eng
发信站: BBS 未名空间站 (Sun Aug 18 13:00:25 2013, 美东)
From my group. Contact x****[email protected] if interested. Will be deleted once
filled.
00244107
Job Details
Halliburton Drill Bits and Services has a position open for a Computational
Mechanics Research and Development Engineer in the Woodlands, TX. As a
leader in the oilfield services industry, Halliburton offers challenging
opportunities for competent people who wan... 阅读全帖 |
|
x*******6
发帖数: 994 | 36 We are searching for a Technical Manager to drive the research and
development of wrought sheet alloys and their processing for structural
applications in automotive and aerospace markets.
POSITION REQUIREMENTS
• B.S. in Materials Science, Metallurgical Engineering or related
technical field; advanced technical degree preferred
• Successful background in research and product development within a
commercial environment
• Experience with casting and/or rolling of flat metal produ... 阅读全帖 |
|
发帖数: 1 | 37 1 PhD position in Multiscale Modeling of Materials at San Diego State
University, California, USA
1 PhD position with starting date in mid August 2018 is available in the
Multiscale Modeling of Materials (M3) group at the department of Mechanical
Engineering (ME) at San Diego State University (SDSU), California, USA,
under the supervision of Dr. Wenwu Xu https://www.m3sdsu.com/ and a co-
advisor at University of California, San Diego. This position covers tuition
fee and provides $21,500/yr of... 阅读全帖 |
|
m**********2
发帖数: 6568 | 38 for a day or two, yes.
over time, with change in temperature, humidity...... drywall will deform.
and once the angle changes, it is downhill ride. |
|
f**y
发帖数: 559 | 39 try to change air filter. a deformed filter can cause loud air flow noise |
|
M********I
发帖数: 848 | 40 What is PEX?
PEX is cross-linked polyethylene. Through one of several processes, links
between polyethylene molecules are formed to create bridges (thus the term "
cross-linked). This resulting material is more durable under temperature
extremes, chemical attack, and better resists creep deformation, making PEX
an excellent material for hot water and other applications.
How long has PEX been used?
PEX was developed in the 1960s. PEX tubing has been in use in many European
countries for plumbing,... 阅读全帖 |
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f****t
发帖数: 15913 | 41 No, it won't. The board in the middle is glued together and it does not
deform. Just like engineered hardwood floor.
This material is cheaper than solid wood. Unless you ask, builders will
probably use glue laminated boards. |
|
F***Q
发帖数: 6599 | 42
because the alternatives, plywood, MDF, particle boards, are simply glued
wood laminates or saw dusts; the low quality ones, especially particle
boards, deform over time and can't tolerate moisture, scratches and weight.
solid wood can be refinished when scratched or dented, but it can chip or
crack. High quality MDFs, or HDFs (high density fiberboards), can be as good
as solid wood, and are widely used in contemporary furniture manufacture. |
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F***Q
发帖数: 6599 | 43
it is soft, moisture sensitive, glue binding, and more importantly,
deforming quickly over time! |
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u*****d
发帖数: 1009 | 44 Below are my two cents on what you should do, but I'm not close to being an
expert in endocrinology.
As far as I know, tapazole (methimazole) does cause fetal defects, so I
would
strongly recommend you to avoid taking this medication during pregnancy.
There's another drug called PTU which is pretty similar to tapazole, and
studies have shown PTU may be safer than tapzole in pregnant women, but once
again it also has a possibility of causing fetal deformities.
The best treatment that I think you |
|
f******I
发帖数: 769 | 45
would like to know which joint is enlarged and deformed and if it's
symmetrical or not, might want to make sure it's really degenerative vs.
rheumatoid,
there are multiple supplements in the market but i don't think they work as
they are advertised, |
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g*****j
发帖数: 1211 | 46 Rheumatology is a rapidly developing field in the past decade. Many
effective medicine has been developed, and severe joint deformity has been
rare under proper treatment. Most of the medications used in US are
available in China, even some newest biological agents. Find a good doctor
in China should be your first step.
However, the term 风湿 has been used very loosely in China, and I don't even
know what is 类风湿。 You want to make sure that it is indeed an
rheumatological issue. The diagnosis |
|
p*********l
发帖数: 30 | 47 Symptom - Pain and numbness in the neck, shouders, arm, and back.
Report by MRI - left central disc extrusion; cord deformity; flattening of
ventral.
Treatement - None because doctor's appointment is 1.5 months aways from when
the pain starts.
Please advise. Questions:
1. What to do in the mean time while awaiting for treatement?
2. What to expect to do when seeing doctor in a few more weeks?
Please help. Your advise is much appreciated. Thank you very much.
Health is precious! Hope everyone is |
|
C*******M
发帖数: 153 | 48 四个多月前一天早晨醒来，腰椎部位突然胀痛。先以为扭伤了，帖了一个月膏药不见好
转，凌晨老是痛醒。接着看了一个月Chiroprator依然不见好转。Chiroprator让我去看
Physical Therapy。Physical Therapist让我做了一些稳定腰椎和锻炼腰肌的练习还是
不见好转。后来做了MRI。MRI报告说：
1. Mild degeneration at the L4-5 level includes a small disc bulge and mild
bilateral ligamentum flavum hypertrophy. No lumbar disk herniation is
evident.
2. Very mild T12 and L2 level vertebral body compression deformities of the
chronic and benign and/or of doubtful clinical significance. No acute
fracture evident.
3. Very mild de |
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w*********s
发帖数: 2136 | 49 Jeffry John Aufderheide
vactruth.com
05/25/2010
http://vactruth.com/2010/05/25/vaccines-rockefeller-social-control/
PART I.
History books proclaim with absolute certainty that the pinnacle of public
health is defined by the polio vaccine program. Disease finally conquered by
science. The polio effort was a benchmark for the public to mentally accept
the concept “shots prevent disease.” However, hidden to most Americans
was an elaborate Public Relations scheme being carefully applied by
Rockefell... 阅读全帖 |
|
b*******l
发帖数: 1095 | 50 患者女， 年约60， MR 诊断后已接受大概俗称的“打封闭”治疗，但腰部仍然感觉痛
楚，患者自我评价“打封闭" 的疗效（好转情况）大约是100%中的30%。医生建议进行
外科脊椎手术。 考虑患者年纪及病程，诚心求建议。
EXAM: MR LUMBAR SPINE WITHOUT CONTRAST
INDICATION: Chronic low back pain with left lower extremity radiculopathy.
Weak left sided reflexes. Herniated nucleus pulposus. Technique: Sagittal
and axial T1 and fast spin echo T2, sagittal STIR sequences are performed.
Findings:
There is lower lumbar dextroscoliosis. Very fractional anterolisthesis of L4
is appreciated thought to be secondary t... 阅读全帖 |
|
