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高速锤运动部分的速度一般是u=10-30米/秒。Watermann建议确定能量的方法在变形速度小于C=300秒~(-1)时应用是相当精确的。因此,试验试件的最小高度应为:h=u/c=30/300=0.1米现有高速锤运动部分的行程量为200-600毫米,而NEK-8型高速锤的为300毫米。从NEK-8型高速运动部分的运动方程得出:在变形高度为100毫米的试件时载能体——N_2的膨胀比是相应于全行程膨胀比的2/3,就是说,在这种情况下不可能确定变形能量的最大值。所以,对于NEK-8型高速锤用间接的方法比较恰当,即根据变
The speed of the moving part of the high-speed hammer is generally u = 10-30 m / s. Watermann suggests that the method of determining energy is quite accurate when the deformation rate is less than C = 300 seconds ~ (-1). Therefore, the minimum height of the test specimen shall be: h = u / c = 30/300 = 0.1 m The stroke of the moving part of the existing high-speed hammer is 200-600 mm, compared to 300 mm for the NEK-8 high-speed hammer. From the equation of motion of the NEK-8 high-speed moving part, it is found that in the case of a specimen with a deformation height of 100 mm, the expansion ratio of the carrier-N 2 corresponds to 2/3 of the full stroke expansion ratio, that is, It is not possible to determine the maximum value of deformation energy. Therefore, for the NEK-8 type high-speed hammer with an indirect method is more appropriate, that is based on change