D***0
发帖数: 5214 | 1 那个，我吐槽一下哦。你引用的GC的图里面度量使用的YS也就是yield stress，而MDX
和我看到大部分其他文档用的是ultimate tensile strength，两套数字不能直接拿来
比的。对应关系，给你看一下volvo的一个ppt里面的图，好做参照。 |
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B*Z
发帖数: 7062 | 2 近两天在娱乐版和人打嘴仗，没想到收获不小。尤其其中一个C家粉丝发的图片非常有
说服力。粉丝的解释是“这是2011年的大切，应该和现在的是一款，而且现在应该是只
好不差。注意到c柱和后面用的high strength steel”。所以我觉得应该对现款的GC适
用吧？反正我是不怎么看GC的，以他们自家人的话为准。看图先。
这个关键就是C家定义高强度钢材的标准是200 mpa起步。而且200 mpa的起步级别的钢
材占了42%。其他稍微好点的是8%。到底有多好，C家没说，我也懒的找。这个水平的钢
材到底什么水平呢？还是找个对比物比较好，我来选当然是选MDX了。文字资料在
http://www.autofieldguide.com/articles/engineering-2014-acura-m
摘要：
The materials used for the body-in-white include:
• HSS 340: 4%
• HSS 440: 3%
• HSS 590: 31%
• HSS 980: 14%
• HSS 1... 阅读全帖 |
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D***0
发帖数: 5214 | 3 那个，我吐槽一下哦。你引用的GC的图里面度量使用的YS也就是yield stress，而MDX
和我看到大部分其他文档用的是ultimate tensile strength，两套数字不能直接拿来
比的。对应关系，给你看一下volvo的一个ppt里面的图，好做参照。 |
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f*****h
发帖数: 4489 | 4 我怎么看到新的ls是减重 不是加重？
Materials used include copious ultra-high tensile strength steel, plus lots
of aluminum. As a result, the overall curb weight was reduced by more than
200 pounds compared to the current LS. As a reference, the 2017 Lexus LS has
a curb weight between 4,233 pounds and 4,695 pounds, depending on trim
level.
：
：4751/5100磅的数据链接在哪儿？ |
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b**a
发帖数: 1009 | 5 打人不打脸, 下回注意
日托一贯双重标准, 大家有目共睹
: 我怎么看到新的ls是减重 不是加重？
: Materials used include copious ultra-high tensile strength steel, plus
lots
: of aluminum. As a result, the overall curb weight was reduced by more
than
: 200 pounds compared to the current LS. As a reference, the 2017 Lexus
LS has
: a curb weight between 4,233 pounds and 4,695 pounds, depending on
trim
: level.
: ：
: ：4751/5100磅的数据链接在哪儿？
|
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m*****3
发帖数: 13701 | 6 你这个是半年前的旧货，根据 9/26/2017 Autoweek 的文章，厂家抛弃铝底盘，用的铁
，RWD 4707 磅，AWD 5225 磅，的确很胖很重
autoweek.com/article/car-reviews/first-somewhat-brief-drive-lexus-ls-500
: 我怎么看到新的ls是减重 不是加重？
: Materials used include copious ultra-high tensile strength steel, plus
lots
: of aluminum. As a result, the overall curb weight was reduced by more
than
: 200 pounds compared to the current LS. As a reference, the 2017 Lexus
LS has
: a curb weight between 4,233 pounds and 4,695 pounds, depending on
tri... 阅读全帖 |
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f**p
发帖数: 248 | 7 I'm also a ME newly graduate without any experience. Recruiter helped me
find a position in an oil service company. My daily work is tensile and
pressure calculation along with 3D design.
Don't jump into CS industry. Go to Houston. Bunches of jobs in oil industry
are waiting for you. |
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n******e
发帖数: 1046 | 8 Chemical Engr (MS/PhD): Mechanical Integrity (stretch circuits, DCA,
embeddeds)
Chemical Engr (MS/PhD): Thermal Characterization, Simulation/Modeling/
Process/QTA Coordination
Mechanical Engr (MS): Design - Rigid/Rigid Flex , Prototype and QTA
Integration (Local & CN)
Mechanical Engr (MS): Design - Flex, Prototype and QTA Integration (
Local & CN)
我知道的一些要求
Materials/Mechanical Testing:
Ion Chromatography TMA, DMTA, DSC linked w/ FTIR
X-Sectioning Rheometer... 阅读全帖 |
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t**********6
发帖数: 565 | 9 the message to your inbox was returned. but here you go. hope it helps.
技术层面，想一想如何从reliablity的角度去qualify or approve a design. 复习一
下基本的力学知识会
用得上的。 tensile strength, stress, strain.. and etc..
如何extract field data and establish statistical correlation btw field
failure and reliability
specification.
非技术层面。 如何drive cross-functional team when see a reliability failure.
risk assessment. - 如果产品必须出货，设计必须release, 如何给出reliability
risk assessment. |
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g**********g
发帖数: 1 | 10 General Motors
China Science Laboratory, Shanghai
Researcher, Manufacturing
GENERAL DESCRIPTION OF JOB:
• Execute scientific or engineering research generating new
knowledge and innovative technologies for experimental and math-based
joining research
SUMMARY OF JOB RESPONSIBILITIES:
• Generate research plans, procure and manage materials, tools and
equipment, execute process studies for new joining methods
• Investigate process parameters and their infl... 阅读全帖 |
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q**y
发帖数: 251 | 12 大气压14.7psi，如果室内空气少10%,压力比例降低，如果降到13.7psi，这样内外差就
是1psi。
你的几百个psi是tensile stress吧。这跟你放1000 lbs的东西在悬空的玻璃是两回事。 |
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z***9
发帖数: 1052 | 13 here is better definition of bonded leather from an expert
Every hide is split and the top of the hide becomes TOP GRAIN leather, what
you want. The lower part is the 'splits' and can be made into a suede or
bonded leather. It lacks tensile strength, so its chemically bonded to a
polypropylene sheet and then painted - with the grain pattern embossed into
the hide. And its junk. It lacks the strength of real leather in the fibers,
and yes, a trained eye can detect it pretty easily (best from the ... 阅读全帖 |
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s*****u
发帖数: 371 | 14 湾区的房子，08年曾经交易过，当时做过foundation inspection，说在车库右边的墙
壁上有裂痕然后修复了
STRUCTURAL FAILURE: The perimeter foundation has a horizontal crack in it
that is approximately seven-foot in length and about a quarter of an inch in
width. The crack is located along the right side wall(facing the house) of
the garage at the main garage door opening. This crack is not the result of
settlement, but of steel corrosion (rust). The steel corrosion has caused
expansive forces to develop within the concrete, leading to a t... 阅读全帖 |
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b****5
发帖数: 25 | 15 这个是拿到的foundation inspection report:
Inspection Overview:
This inspection included a visual observation of the perimeter foundation.
It should also be noted that
this inspection consisted of a surface inspection only. No detailed
inspection or testing of underlying soils
and geologic conditions was performed for this inspection. Subsurface
conditions can be quite different
from those suggested by surface environment. The original construction
drawings, soils report and
building permit were not av... 阅读全帖 |
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P******e
发帖数: 344 | 16 updated keywords
collagen, gelatin, crosslinking
material characterization
FTIR,mechanical test(tensile test, creep test ect.) |
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m*****f
发帖数: 60 | 17 有五篇稿子，帮转审稿机会，是一个没有影响因子的open access journal，具体topic
如下：
1. Key words: Statistical thermodynamics, Heat capacity of metal, Continuum
physics, Debye temperature, Binomial theorem, Boltzmann constants, Epn heat
capacity
2. Keywords: composite structure; effective stiffness; corrugated skin;
tensile and flexural stiffness.
3. Keywords: Schizophyllum commune; Pycnoporus sanguineus; extraction; yield
; kinetic
4. Keywords: Damage; Structures; Modal analysis; Virtual Flexibility
Matrix(VFM); Identificat... 阅读全帖 |
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G***6
发帖数: 1323 | 18 Mechanical and physical behaviour of nanomaterials loaded polymer composites
ABSTRACT: Nanomaterials show great application potential in many fiels due
to their enhanced intrinsic properties compared to other materials. Herein,
the influence of multi-walled carbon nanotubes (MWCNTs) and graphene
nanoplatelets (GnPs) in epoxy resin were investigated to compare their
physical and mechanical properties. The result shows that GnPs /epoxy resin
composite have better tensile and compressive strength c... 阅读全帖 |
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s**********2
发帖数: 305 | 19 你好，我在积攒审稿，麻烦帮忙推荐。
我是材料物理，做的半导体纳米材料制备，比较符合我的背景。
谢谢了。
Interested in serving as a reviewer
1. My background
2. Keywords
3. Published journals and paper I have reviewed.
4. Thanks.
Dear Editor,
I graduated from Nanoelectronics Lab at University of Wyoming in 2014 and
hold a Ph.D. degree in Physics (Materials and Electronics). I got my
bachelor degree in Jilin University in 2009, one of the top 10 universities
in China. My name is Liyou Lu and I am currently a product/test engineer at
Fre... 阅读全帖 |
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i*********e
发帖数: 97 | 20 Title: Development of thermal and tensile properties of Bi-doped Sn-6.5Zn-0.
3Cu solders for microelectronic applications
Materials Science and Engineering B.
Please PM me if you are interested. |
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a*****y
发帖数: 1488 | 23 Trek 700
Frameset
Sizes 15, 17.5, 20, 22.5"
Frame Trek steel, hybrid design
Fork High tensile steel w/curved blades
Wheels
Wheels Alloy hubs; Bontrager 550 36-hole alloy rims
Tires Bontrager H4, 700x35c
Drivetrain
Shifters SRAM MRX, 7-speed twist
Front Derailleur n/a
Rear Derailleur Shimano TX51
Crank Alloy, 42T chainring w/guard
Cassette Shimano 14-34, 7 speed
Pedals Nylon platform
Components
Saddle Bontrager Boulevard
Seat Post Alloy, adjusta... 阅读全帖 |
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s*******i
发帖数: 12823 | 24 Material Young's modulus (TPa) Tensile strength (GPa) Elongation
at break (%)
SWNT ~1 (from 1 to 5) 13–53E 16
Armchair SWNT 0.94T 126.2T 23.1
Zigzag SWNT 0.94T 94.5T 15.6–17.5
Chiral SWNT 0.92
MWNT 0.27E[17]–0.8E[24]–0.95E[17] 11E[17]–63E[17]–150E[24]
Stainless steel 0.186E[25]–0.214E[26] 0.38E[25]–1.55E[26] 15–
50
Kevlar–29&149 0.06E[27]–0.18E[27] 3.6E[27]–3.8E[27] ~2
强度跟同等直径的最好的不锈钢相当，可拉长约20%才break
现在最长的可以拉到20... 阅读全帖 |
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c*******r
发帖数: 1243 | 25 德州射箭论坛有人也在问猎鳄鱼，有不错的回帖，给你转贴过来作为参考。
From Peon:
All of the hunting is daylight only, unless you put in for the ALM category.
You get from noon to noon to catch a gator. I've taken my boys twice and
have been 3 times myself. I would suggest to have your chicken quarters pre
hooked on three foot leaders, put them in a bucket three or four days before
the hunt, any longer they get mushy. I usually setup three or four extras
so I can freshen them up if needed. I also pour a cup of cooking oil in the
bo... 阅读全帖 |
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k*****u
发帖数: 578 | 26 据magpul的测试，他们的弹匣可以一直压着弹簧也不会有问题。其实这牵涉到材料科学
上面的三个概念，因为这是我的专业，所以我来给大家说说。这第一个概念叫做
elastic vs. plastic；第二个概念叫做creep；第三个概念叫做ductile to brittle
transition。
先说第一个概念 elastic vs. plastic。弹簧在其设计的弹性范围之内的伸缩都应属于
elastic区域，也就是说是不会有永久的形变导致弹簧失效的。而如果你在三十发的弹
匣里压了三十一发或者故意把弹簧拉长一节，那就会导致plastic deformation，也就
是弹簧的长度会有永久性的变化，这时候弹簧可能就会有不给力的情况了。
第二个概念creep是指的弹簧在长期受力情况下tensile stress和yield stress都会慢
慢变小，也就是说plastic deformation会提早发生。可是注意一点，假如是在室温情
况下，这个过程是会很长的，尤其是在弹簧的材料有很大进步的今天，要等到creep的
发生估计你一辈子都等不到。但是如果温度变高很多，不如说从室温变到几百度... 阅读全帖 |
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c*******r
发帖数: 13580 | 27 Strength is not a factor when I choose the size of rope. Even a 5mm perlon
is strong enough. My kidney will be crushed long before the rope is broken.
(however, it doesn't take too much force to cut the rope when it's taut, and
the diameter of the rope doesn't help much). All ropes have to pass CE/UIAA
tests. I don't have the data on top of my head but I assure you the tensile
strength is not an issue. The reason I use a thicker rope is because it can
take more abuse. You hang a lot when you cra |
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c*******r
发帖数: 13580 | 28 you kidding me? a whipper leader fall on an overhanging sport route can
easily put 10kN force on the rope. the tensile strength of a single rope is
usually well over 25kN.
can you create a 10kN force rappelling with a kayak? |
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t****i
发帖数: 4225 | 29 materials, composition, structure(like core-shell, fiber bundle, etc), etc
can make a big difference in price.
You won't find much information about the physical parameters such as Young'
s modulus and tensile strength for strings on those website. |
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g******n
发帖数: 53185 | 30 pt比较硬所以可以用很纯的比如pt950。要是用黄金或者white gold只能用18k的。如果
钻石color是D,E可以用黄金的托，颜色差一些的钻石配pt或者white gold的托显得钻石
更白些。pt的一个问题就是很容易dull,戴久了容易失去luster。white gold的问题就
是戴久了表面电镀的rhodium会消失，会显出淡淡的黄色。
HARDNESS AND DURABILITY
In discussions about precious metals people often confuse hardness with
strength, but they are not the same.
Hardness = HV
Often referred to as "scratch resistance," hardness is measured using the
Vickers Hardness scale. This tests the hardness of a metal by pushing a
pointed object into the surfa... 阅读全帖 |
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C***I
发帖数: 242 | 31 The problem is much less likely with the camera than with the lens. Nikon's
18-135 kit lens is notorious for having this problem because of its plastic
mount, and similar problems are already being reported with the new 18-105
VR kit lens that's shipping with the D90 (also a heavy lens with a plastic
mount).
Not sure how I fixed it each time, but turned it off and on a few times, one
occassion took lens off and remounted. Been okay for past few weeks.
It's a fundamental design/engineering issue ... 阅读全帖 |
|
发帖数: 1 | 32 the whole universe is expanding, no?
so why so surprised if 博导蛋蛋 is expanding too? |
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f***t
发帖数: 2247 | 33 艹！博导的蛋蛋现在已经扯到了195了，估计快断裂了。 |
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r****z
发帖数: 12020 | 34 嘘～～，别打岔，月光妹妹正在帮我回答“我是谁？我从哪里来？我往哪里去？”的严
肃哲学问题。 |
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f***t
发帖数: 2247 | 35 靠！博导的蛋蛋都扯到265了，大仙们也太闲了吧，难道都不用上班赚钱了吗？ |
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r****z
发帖数: 12020 | 36 还是挺有收获的，我被许诺揭露我老公的真面目了，很憧憬。据称会在军版发，常去的
帮我盯着点，怕错过了。 |
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f***t
发帖数: 2247 | 37 俺不用去看那个帖子，闭着眼睛用脚趾头都能知道是谁许诺你了。这种烂人你就别招惹
她了，没意思。 |
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r****z
发帖数: 12020 | 38 我怎么会招惹她，是她百忙之中来关照我住哪里，然后又主动许诺人肉我的真实面目，
盛情难却啊。你们也别惹她了，好让她集中精力人肉我和我老公，大家和我一起围观一
下得了。 |
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P***e
发帖数: 804 | 40 Ipad 10 Ultimate, made of the strongest aluminium alloy on the planet,
with a tensile strength of 1000 MPa, protect body from injury with
AK47 bullet direct hit at 100 yards.
8TB HD
16GB RAM
Ios Ultimate (14.01)
1920p HD video
Windows/Linux compatible
Waterproof up to 100ft
Customize from 1"- 240"
better |
|
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q****i
发帖数: 6923 | 42 62991-888 - VWR TUBING RD5/16X1/16INPK50FT
Supplier: VWR International
VWR* Red Rubber Tubing^ High-quality, durable, natural rubber tubing for
general laboratory use. Seamless, with uniform medium wall and low sulfur
content. Durometer hardness: Shore A, 50. Tensile strength: 2500-3500psi.
Coil length: 15.2m. 7.9IDx11ODmm. Wall thickness: 1.6mm
Cole-Parmer
Black Rubber Tubing
EW-96142-07
Black Rubber Tubing, 5/16" ID x 7/16" OD, 25 ft, wall thickness 1/16"
(package)
chlorinated.
查到２个vendor一... 阅读全帖 |
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b*****d
发帖数: 591 | 43 【 以下文字转载自 Macromolecules 讨论区 】
发信人: bigwood (kkk), 信区: Macromolecules
标 题: Job Position - Extrusion Process & Product Development Engineer
发信站: BBS 未名空间站 (Thu Jul 21 13:17:28 2011, 美东)
Company: Tepha, Inc. (www.tepha.com)
Location: Lexington, MA
Title: Extrusion Process & Product Development Engineer
Summary:
This position requires hands-on individual with fiber extrusion and
processing experience within the medical device industry. The individual
must be a self starter, able to work wi... 阅读全帖 |
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v*********r
发帖数: 184 | 44 我的意思是美国不生产Rayon based carbon fiber,书上看来的，不知道是否正确？
能否指点一下到底如何判断炭纤维的前体啊？光从morphology看得出来么？还是要做
tensile strength?但是stablization 和 carbonation process可以改变得到不同性质
的碳纤维。
谢谢！ |
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v*********r
发帖数: 184 | 45 那SEM或者TEM看得出来从不同precursor生成的 carbon fiber的区别吗？
另外有没有什么实验室可以做 tensile，thermal,electrical 表征的可以推荐一下？
对外收钱服务的那种。
谢谢！ |
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z**h
发帖数: 224 | 46 kind of remembering. you include both the tensile stress and the shear
stress? |
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l*y
发帖数: 21 | 47 I had little expereince on mechanical propeties and not confident about my own
answers. Please advise, friends. We all know there are some big bulllls
around, and hope to learn from you guys. Thanks a lot.
Here are my friend's question:
Is yield strength of polymer would be same for both tensile and
compressive stress condition? We know that, in general, ceramics have
higher yield strengh under compression than that under tension.
Is yield strength a good parameter for measuring the failure of p |
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w********h
发帖数: 12367 | 48 (1) Compression modulus is different from tensile modulus for sure.
(2) You need to consider many parameters: modulus, strain and stress.
check your Experiments for Polymer Science edited by Ou Guorong.
There is one experiment for that, very detailed.
stiffness is judged by modulus;
toughness is judged by strain;
strength is judged by stress.
own |
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w********h
发帖数: 12367 | 49 固含量 or gel fraction is not crosslinking density.
normally people use shear modulus (G) or tensile modulus to deduce Mc
between two neighboring crosslinks via Mc=rouRT/G. |
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b*****d
发帖数: 591 | 50 Company: Tepha, Inc. (www.tepha.com)
Location: Lexington, MA
Title: Extrusion Process & Product Development Engineer
Summary:
This position requires hands-on individual with fiber extrusion and
processing experience within the medical device industry. The individual
must be a self starter, able to work with miimal supervision and must be
goal oriented.
Duties:
The development and commercialization of novel new biopolymer medical
products.
The development of manufacturing processe... 阅读全帖 |
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