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里氏硬度(用符号L_D表示),是一种新的动态硬度试验方法,系美国Dietmer Leeb博士于1978年首先提出。 里氏硬度定义为冲击体对检验对象冲击时的回跳速度与冲击速度的比值。其工作过程是:用一个直径很小的碳化钨冲头,在恒定的试验力作用下冲击检测对象表面,测量冲头距试样表面1mm处的冲击速度与回跳速度,转换成与冲击和回跳速度成正比的电压,按下式计算里氏硬度值L_D,L_D=1000(V_B/V_A),式中V_A-冲头冲击速度,V_B-冲头回跳速度。
The Leeb hardness, indicated by the symbol L_D, is a new dynamic hardness test method first proposed by Dr. Dietmer Leeb in 1978 in the United States. Leeb hardness is defined as the ratio of impact velocity to impact velocity when the impact body impacts the test object. The work process is: with a small diameter tungsten carbide punch, the impact of the test object under constant test force the surface, measuring the punch from the sample surface 1mm at the impact velocity and bounce speed, into the impact and impact Bounce rate is proportional to the voltage, according to the following formula to calculate the Leeb hardness value L_D, L_D = 1000 (V_B / V_A), where V_A-punch impact speed, V_B-punch rebound speed.