国产精品亚洲а∨怡红院,亚洲最大成人网 色香蕉,亚洲乱亚洲乱少妇无码,久久久久国产a免费观看rela

常州精密鋼管博客網(wǎng)

材料的強(qiáng)度與塑性

Properties of Materials

Application Properties 使用性能

Properties performed when the materials are applied,including mechanical properties, physical properties and chemical properties.

Processing Properties 工藝性能

Properties performed when the materials are machined,including casting, forming, joining and machining, etc

Many materials when in service, are subjected to forces or loads. Mechanical properties are most essential in engineering!

Important mechanical properties of materials include

strength 強(qiáng)度 plasticity 塑性 hardness 硬度 impact toughness 沖擊韌性 

fracture toughness 斷裂韌性 fatigue 疲勞  viscoelasticity 滯彈性

1.1 Strength and plasticity 強(qiáng)度與塑性 

Testing method: tensile testing .Specimen geometries: recommended by ASTM or GB 


The tensile testing machine is designed to elongate the specimen at a constant rate, and to continuously and simultaneously measure the instantaneous applied load (with a load cell) and the resulting elongations (using an extensometer). The specimen is mounted by its ends into the holding grips of the testing apparatus. 

A stress-strain test typically takes several minutes to perform and is destructive; that is, the test specimen is permanently deformed and usually fractured. The output of such a tensile test is recorded on a strip chart (or by a computer) as load or force versus elongation.







Engineering Stress

工程應(yīng)力

圖片3.png

  



Yield Strength 屈服強(qiáng)度


However, most engineering materials have no obvious yield point on stress-stain curve, thus it is usually given as the stress required causing 0.2% plastic strain, know as the 0.2% offset yield stress ?0.2.  條件屈服強(qiáng)度





Ultimate Tensile Strength 極限抗拉強(qiáng)度

The ultimate tensile strength is the maximum strength reached in the engineering stress-strain curve. 

If the specimen develops a localized decreased in cross-sectional area (commonly called necking 頸縮), the engineering stress will decrease with further strain until fracture occurs since the engineering stress is determined by using the original cross-sectional area of the specimen.

Tensile strengths may vary anywhere from 50MPa for an aluminum to as high as 3000 MPa for the high-strength steels.

Ductility 塑性 

Ductility  of metals is a measure of the degree of plastic deformation that has been sustained at  fracture. 

A material that experiences very little or no plastic deformation at fracture is termed as brittle 脆性的. (approximately having a fracture strain of less than about 5%)

A knowledge of the ductility of materials is important for at least two reasons. 

(i) It indicates to a designer that the degree to which a structure will deform plastically before fracture. 

(ii) It specifies the degree of allowable deformation during fabrication operations.


Ductility 塑性 

Ductility may be expressed quantitatively as either 

percentage elongation (δ,斷后伸長率)   or percentage reduction in area (ψ,斷面收縮率).

δ = (final length – initial length) / initial length ? 100% = (lf  – l0) / l0 ? 100%

ψ = (initial area – final area) / initial area ? 100%  = (Ao – Af) / Ao ? 100%


圖片加載中...
? 請關(guān)注 微信公眾號: steeltuber.
 轉(zhuǎn)載請保留鏈接: http://gzsunfar.com/Steel-Knowledge/Strength-and-plasticity-of-materials.html
(本平臺"常州精密鋼管博客網(wǎng)"的部分圖文來自網(wǎng)絡(luò)轉(zhuǎn)載,轉(zhuǎn)載目的在于傳遞更多技術(shù)信息。我們尊重原創(chuàng),版權(quán)歸原作者所有,若未能找到作者和出處望請諒解,敬請聯(lián)系主編微信號:steel_tube,進(jìn)行刪除或付稿費(fèi),多謝!)
搜索本站鋼鐵技術(shù)
★↓在此搜索查找鋼鐵材料知識↓★↘

互聯(lián)網(wǎng) gzsunfar.com


鋼鐵行業(yè)熱點(diǎn)文章推薦

常州精密鋼管博客網(wǎng)主辦單位:
常州仁成金屬制品有限公司 是 專業(yè)的 精密鋼管 生產(chǎn)廠家,汽車鋼管,電機(jī)殼鋼管 生產(chǎn)單位。


常州精密鋼管博客網(wǎng)推薦您訪問:

常州精密鋼管博客網(wǎng)
(常州仁成金屬鋼管制品生產(chǎn)廠家博客網(wǎng)站)
gzsunfar.com?2006-2021
蘇ICP備08003692號

【關(guān)于本站】【提問】網(wǎng)站地圖【搜索】【知識星球】電腦端

国产一区二区无码专区| 国产美女口爆吞精普通话| 麻豆妓女爽爽一区二区三| 人妻无码中文久久久久专区 | 一本到无码av专区无码不卡| 亚洲狠狠做深爱婷婷影院| 精品久久久噜噜噜久久| 自拍偷区亚洲综合美利坚| 久久久精品| 亚洲性无码一区二区三区| 亚洲一卡2卡3卡4卡 精品| 日韩午夜爽爽人体A片视频| 一本大道久久东京热无码av| 天天爽天天狠久久久综合麻豆| 国产精品久久久久久妇女| 四虎精品国产永久在线观看| 天堂无码人妻精品一区二区三区| 久久成人亚洲香蕉草草| 国产高清视频一区三区| 男人扒女人添高潮视频| 成人免费看www网址入口| 精品99日产一卡2卡三卡4| 四虎精品免费永久免费视频| 亚洲中文久久精品无码| 久久精品一卡二卡三卡四卡| 久久久久av综合网成人| 久久婷婷人人澡人人喊人人爽| 乱人伦人妻中文字幕无码久久网| 国产sm调教视频在线观看| 国产在线午夜不卡精品影院| 内射干少妇亚洲69xxx| av国产传媒精品免费| 久久不见久久见www日本| 久久99国产精品久久| 日本丰满老妇bbb| 精品久久久久久无码中文野结衣| 在线观看免费人成视频色9| 日韩精品无码专区| 色偷偷人人澡人人爽人人模| 久久天堂av女色优精品| 动漫av纯肉无码av在线播放|