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一、问题的提出JB710-65《拉力蠕变试验机技术条件》,JB1389-74《持久强度试验机技术条件》及JB706-77《机械式拉力试验机技术条件》三个部颁标准中,都有一个很重要的指标,即加荷系统应具有准确的拉力中心,其偏心率不应超过15％,并在三个标准的验收规则中,提出了具体的检查方法,指明用直径为10mm,计算长度为100mm的标准试样,在相互垂直的两方向安置引伸计,加负荷测其相对方向的变形(见图1),其偏心率按下式计算:
First, the issue put forward JB710-65 “tensile creep testing machine technical conditions”, JB1389-74 “lasting strength test machine technical conditions” and JB706-77 “mechanical tensile testing machine technical conditions” three ministerial standards, both There is a very important indicator that the loading system should have an accurate center of pull and its eccentricity should not exceed 15%. In the three standard acceptance rules, a specific inspection method is proposed, specifying that a diameter of 10 mm, Calculation of the length of 100mm standard sample, placed in two mutually perpendicular extensometer, load measured the relative direction of the deformation (see Figure 1), the eccentricity calculated as follows: