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萬能拉力試驗機動態(tài)與靜態(tài)檢驗精準度
文章來源:威邦儀器  人氣:1054  發(fā)表時間:2019-06-10

萬能拉力試驗機可剖析整個測驗的成果,例如伸長量、應(yīng)力、應(yīng)變、損壞值、平均值等。萬能拉力試驗機亦可合作測驗?zāi)繕说男褪交驊┣髮⒃嚻瑩p壞并獲得整個測驗進程,剖析測驗樣品的物理特性,如拉力、抗壓、抗彎、疲憊、剝離力、彎折等等。另備有試片制造設(shè)備如空壓切試片機、硬質(zhì)試片切割機、熱壓成型機等可制造規(guī)范試片讓測驗更精準。
Universal tensile testing machine can analyze the test results, such as elongation, average value, the stress, strain and damage, etc. Universal tensile testing machine can also be cooperation test target model or begged specimens will be damaged and get the whole test process, analyzes the physical properties of the test samples, such as tensile, compressive, flexural and fatigue, stripping force, bending, etc. The other specimens with specimens cut machine manufacturing equipment such as air compressor, specimens of hard cutting machine, such as hot pressing molding machine can be made more accurate standard specimens to test.
萬能拉力試驗機檢驗時的靜態(tài)與動態(tài)準確度:
Universal tensile testing machine test the static and dynamic accuracy of:
1、萬能拉力試驗機的靜態(tài)準確度
1, universal tensile testing machine, static accuracy
對于每個力的量程,規(guī)定了試驗機準確度的級別為1級或2級,試驗機的每一量程的分級,要根據(jù)檢驗試驗機時測得的精密度和準確度的值確定。
For each power range, set the machine accuracy level for level 1 or level 2, every range of machine classification, according to the testing machine when measured values determine the precision and accuracy.
標準中給出了1級和2級精密度和準確度的最大允許值,誤差的圖解說明具體見標準。試驗機若單獨有壓縮或其他試驗?zāi)J降牧砍虝r,這些量程應(yīng)獨立進行檢驗。
Standard grade 1 and grade 2 is given in the precision and accuracy of maximum allowable values, see diagram to explain the specific standard error. Machine test if separate compression or other model range, the test should be independent.
檢驗的方法應(yīng)依據(jù)有關(guān)標準,經(jīng)過檢驗的裝置應(yīng)在表1給出的準確度極限以內(nèi)。如果試驗機要用于測量循環(huán)力,應(yīng)以遞增和遞減力兩種方式進行檢驗。
Test methods should be according to relevant standards, after inspection of the device should be within the accuracy limits in table 1. If the trial is confidential and used for measuring the circular force, should be two ways of increasing and decreasing force test.
2、萬能拉力試驗機的動態(tài)準確度
2, universal tensile testing machine and dynamic accuracy
裝有電子測力裝置的拉力試驗機,可以認為在標準第9章所給出的各試驗速度下完全無慣性。但這未必適用于通常和它們一起使用的電子記錄儀,在許多情況下這些記錄儀的動態(tài)不準確度大大超過它們的靜態(tài)不準確度。
Equipped with electronic tensile testing machine, load device can be thought of in the standard given by the chapter 9 test speed completely without inertia. But this does not necessarily apply to and together they usually use electronic recorder, in many cases the recorder dynamic not accuracy considerably more than their static accuracy.
所有的機電式記錄儀都存在動態(tài)誤差,此誤差通常來源于由裝置的慣性而產(chǎn)生的加速度誤差和由機械與靜電的摩擦作用引起的筆的滯后誤差。記錄儀動態(tài)準確度的測量最好通過記錄試驗過程中的誤差信號大小來實現(xiàn)。這在不影響儀器性能的情況下能夠完成,但通常在技術(shù)上是困難的。因此認為目前在本標準中規(guī)定動態(tài)準確度的極限和校準方法是不切合實際的。所以,用戶要從萬能拉力試驗機生產(chǎn)廠獲得用以計算概率測量誤差和評估該誤差是否顯著的記錄儀動態(tài)準確度圖。在有這種動態(tài)誤差的情況下,可通過降低試驗速度,或通過提高輸出裝置的滿量程讀數(shù),來降低加速度和速度。
All electromechanical recorder is dynamic error, the error is usually based on the device of inertial acceleration error and caused by the friction effect of mechanical and electrostatic pen lag error. Recorder in the process of dynamic measurement accuracy by record test best size of the error signal. Under the condition of the instrument performance is not affected to complete, but often it is technically difficult. So that the current in the limit of the dynamic accuracy of this standard and calibration method is not practical. So, the user should obtained from testing machine manufacturer to calculate probability measurement error and evaluate whether the error significantly recorder dynamic accuracy. In a case, with the dynamic error can be reduce the test speed, or by raising the output device of a full scale reading, to reduce the acceleration and speed.

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