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万能拉力试验机动态与静态检验精准度
文章来源:威邦仪器  人气:166  发表时间:2019-06-10

万能拉力试验机可剖析整个测验的成果,例如伸长量、应力、应变、损坏值、平均值等。万能拉力试验机亦可合作测验目标的型式或恳求将试片损坏并获得整个测验进程,剖析测验样品的物理特性,如拉力、抗压、抗弯、疲惫、剥离力、弯折等等。另备有试片制造设备如空压切试片机、硬质试片切割机、热压成型机等可制造规范试片让测验更精准。
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.
万能拉力试验机检验时的静态与动态准确度:
Universal tensile testing machine test the static and dynamic accuracy of:
1、万能拉力试验机的静态准确度
1, universal tensile testing machine, static accuracy
对于每个力的量程,规定了试验机准确度的级别为1级或2级,试验机的每一量程的分级,要根据检验试验机时测得的精密度和准确度的值确定。
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.
标准中给出了1级和2级精密度和准确度的最大允许值,误差的图解说明具体见标准。试验机若单独有压缩或其他试验模式的量程时,这些量程应独立进行检验。
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.
检验的方法应依据有关标准,经过检验的装置应在表1给出的准确度极限以内。如果试验机要用于测量循环力,应以递增和递减力两种方式进行检验。
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、万能拉力试验机的动态准确度
2, universal tensile testing machine and dynamic accuracy
装有电子测力装置的拉力试验机,可以认为在标准第9章所给出的各试验速度下完全无惯性。但这未必适用于通常和它们一起使用的电子记录仪,在许多情况下这些记录仪的动态不准确度大大超过它们的静态不准确度。
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.
所有的机电式记录仪都存在动态误差,此误差通常来源于由装置的惯性而产生的加速度误差和由机械与静电的摩擦作用引起的笔的滞后误差。记录仪动态准确度的测量最好通过记录试验过程中的误差信号大小来实现。这在不影响仪器性能的情况下能够完成,但通常在技术上是困难的。因此认为目前在本标准中规定动态准确度的极限和校准方法是不切合实际的。所以,用户要从万能拉力试验机生产厂获得用以计算概率测量误差和评估该误差是否显著的记录仪动态准确度图。在有这种动态误差的情况下,可通过降低试验速度,或通过提高输出装置的满量程读数,来降低加速度和速度。
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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