日韩欧洲精品无码AV,99国产午夜精品一区二区天美,精品久久免费一区二区三区四区,久久综合图区亚洲综合图区,久久久久亚洲AV免费观看,精子网久久国产精品,亚洲AⅤ无码一区二区二三区性色,亚洲精品国产电影,亚洲资源在线观看,婷婷五月丁香在线

  • 
    
  • <ul id="yy6ca"></ul>
  • <del id="yy6ca"></del>
    <ul id="yy6ca"></ul>
    <strike id="yy6ca"><menu id="yy6ca"></menu></strike>
    Hotline:400-880-1556

    English




    Project Introduction

    Yield strength: It is the yield limit when the metal material yields, that is, the stress that resists the slight plastic deformation. For metallic materials without obvious yield, the stress that produces 0.2% residual deformation is defined as its yield limit, which is called the conditional yield limit or yield strength. An external force greater than this limit will permanently deform the part and cannot be recovered.

    image.png

    experiment method

    There are generally two methods for measuring the upper and lower yield strengths: the graphic method and the pointer method.

    · Graphic method

    During the test, an automatic recording device was used to draw the force-chuck displacement diagram. It is required that the ratio of the force axis is less than 10N/mm2 per mm, and the curve must be drawn at least to the end of the yield stage. Determine the constant force Fe on the yield platform, the maximum force Feh before the force first falls in the yield stage, or the minimum force FeL that is less than the initial transient effect on the curve.

    The yield strength, upper yield strength and lower yield strength can be calculated according to the following formula:

    Yield strength calculation formula: Re=Fe/So; Fe is the constant force at yield.

    The formula for calculating the upper yield strength: Reh=Feh/So; Feh is the maximum force before the force drops for the first time in the yield stage.

    The calculation formula of the lower yield strength: ReL=FeL/So; FeL is the minimum force FeL less than the initial transient effect.

    · Pointer method

    During the test, the constant force when the pointer of the force measuring disc stops rotating for the first time or the maximum force before the pointer turns for the first time or the minimum force less than the initial instantaneous effect corresponds to the yield strength, upper yield strength, and lower yield strength, respectively.

    Guideline

    experiment method

    Pilot projects

    Test accuracy

    Room temperature tensile test

    Standard Test Methods for Tension   Testing of Metallic Materials

    ASTME8/E8M-13a

    Standard Test Methods and   Definitions

    for Mechanical Testing of Steel Products  

    ASTM A370-14

    Metallic materials -- Tensile   testing -- Part 1: Method of test at room temperature

    EN ISO6892-12009

    Metal material indoor tensile test   method

    GB/T228-2002

    Metallic material tensile test Test   method at room temperature

    JISZ2241-2011

    Metallic materials -Tensile testing   at ambient temperature

    AS 1391-2007

    Standard Test Methods for Tension   Testing Wrought and Cast Aluminum-and Magnesium-Alloy Products

    ASTM B557-14

    High temperature tensile test

    Standard Test Methods for Elevated   Temperature Tension Tests of Metallic Materials

    ASTME21-09

    Metallic materials -- Tensile   testing - Part 2: Method of test at elevated temperature

    ISO 6892-22011

    Metallic materials--Tensile testing   at elevated temperature

    GB/T 4338-2006

    High-temperature tensile test   method for steel materials and heat-resistant alloys

    JIS G0567-1998

    Metallic materials--Tensile testing   at elevated temperature

    AS 2291-2007

    Low temperature tensile test

    Metallic materials Low temperature   tensile test method

    GB/T 13239-2006

    Metallic materials Low temperature   test method

    ISO 15579:2000

    Yield strength testing and sample preparation requirements

    Normal temperature and high temperature stretching: 1. Wire and round bar samples: d≥10mm, length L≥200mm 3mm≤d≤10mm, length L≥200mm d≤3mm, length L≥1000mm (minimum wire 300mm, minimum bar 80mm ) 2. Rectangular sample: ≥16*200mm (L min 120mm) 3. Tubular sample: OD ≤ 30mm, L ≥ 300mm (min 150) OD> 30mm, general requirement L ≥ 300mm and OD ≤ 55mm, can be used for whole tube Stretching 4. The shrinkage rate of the cross section requires the length of the detection interval d ≥ 5mm.


    Online consultation

    Online consultation

    Recommend
    • BSCI certification

      BSCI certification

      BSCI certification is an abbreviation of BusinessSocialComplianceInitiative, and Chinese is called business social standard certification. BSCI is an organization that advocates the business community to abide by social responsibility. At the same time, it is a non-profit organization.

    • Enterprise CMA certification

      Enterprise CMA certification

      CMA, the name is \"China Metrology Accreditation\", the abbreviation of \"China Metrology Accreditation\" in English. According to the provisions of Article 22 of the Metrology Law of the People’s Republic of China: “The product quality inspection agency that provides notarized data to the society must be evaluated by the metrological administrative department of the people’s government at or above the provincial level for the capability and reliability of metrological verification and testing. Qualified.\"

    • CNAS certification

      CNAS certification

      Laboratory accreditation is a third-party certification that CNAS has the ability to perform specific testing and calibration work for testing and calibration laboratories.

    Yield strength test

    Yield strength: It is the yield limit when the metal material yields, that is, the stress that resists the slight plastic deformation.

    Get a quote
    国产91精品对白露脸全集观看| 日韩一欧美内射在线观看| 激情国产av做激情国产爱| 亚洲性猛交xxxx| 中文午夜乱理片无码| 国产极品美女高潮抽搐免费网站| 国产精品青草久久久久婷婷| 国产美女视频国产视视频| 亚洲精品无码久久毛片波多野吉衣 | 国产精品亚洲欧美一区麻豆| 亚洲欧美日韩v中文在线| 国产亚洲午夜高清国产拍精品| 天堂…在线最新版资源| 天天夜碰日日摸日日澡性色av| 久久久久亚洲av成人片| 美女裸体十八禁免费网站| 毛片免费视频在线观看| yyyy11111少妇无码影院| 无码高潮少妇毛多水多水免费| 亚洲男人的天堂网站| 在线天堂免费观看.www| 国产精品久久久久久久久久妞妞| 亚洲国产精品一区二区第四页 | 久久国产精品免费一区二区三区| 亚洲综合图片人成综合网| 国产精品国产国产av| 免费三级网站| 这里只有精品最精视频| 免费人成A大片在线观看| 午夜人性色福利无码视频在线观看| 国产欧美亚洲精品第一页| 亚洲成色WWW久久网站| 日本熟妇人妻xxxxx| 久久99国产精品二区不卡| 久久精品99国产精品日本| 亚洲国产成人无码aV一区二区| 欧美粗大猛烈老熟妇| 日韩精品一区二区亚洲AV手机在线 | 久久综合九色综合国产| 国产精品亚洲五月天高清| 日韩精品无码免费专区网站|