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

婷婷丁香五月激情综合| 尤物国产在线精品福利三区| 久久精品久久精品中文字幕| 精品国产一区二区三区国产区| 玖玖资源站亚洲最大成人网站 | 天堂中文最新版在线中文| 日本精品αv中文字幕| 国产高清乱理伦片| 青草内射中出高潮| 午夜高清在线无码| 国产成人亚洲精品狼色在线| 亚洲人成网站在线在线观看| 无遮挡午夜男女xx00动态| 制服视频在线一区二区| 国产一区丝袜在线播放| 国产自在自线午夜精品视频| 成人免费视频?国产免费| 亚洲人成人无码网www国产| 亚洲一区在线日韩在线深爱| 久久久久国产精品嫩草影院| 野花社区在线观看视频| 天天躁夜夜躁狠狠躁婷婷| 亚洲电影区图片区小说区 | 中文字幕av一区二区三区| 亚洲精品无码精品mv在线观看| 欧美精欧美乱码一二三四区| 男女性高爱潮免费观看| 国产精品天天狠天天看| 亚洲日产精品一二三四区| 久久精品免费一区二区三区 | 亚洲精品成人久久电影网| 欧美 亚洲 另类 综合网| 久久99热久久99精品| 99久久国语露脸精品国产色| 亚洲综合色88综合天堂| 国产乱xxxxx97国语对白| 国产爆乳无码一区二区麻豆| 一本久久综合亚洲鲁鲁五月天 | 亚洲乱码中文字幕手机在线 | 久久综合色_综合色88| 午夜片无码区在线观看视频|