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压入式硬度计只有在平面体上进行测量才能获得正确的硬度值。若要在曲面体上得到真实硬度值,则必须对实测硬度值进行修正。对于维氏硬度通常采用下式修正:HV=K_vHV′(1)式中,HV-被测体的真实硬度;K_v-修正系数;HV′-被测体实测硬度或称示值硬度。对于维氏硬度的修正系数国际上已有标准,国内有关部门亦推存采用其数值,但尚未见到对这些数值物理意义的阐述。我们曾经提出对于压入式硬度来说,相同硬度值的材料对硬度计压头具有等应力抗力。从这一观点可引伸出曲面体硬度修正值实质上是压头与被测体示值接触面积(按实测
Press-in durometers are only measured on a flat body to obtain the correct hardness value. To get the real hardness value on the surface body, you must correct the measured hardness value. The Vickers hardness is usually corrected by the following formula: HV = K_vHV ’(1) where HV is the real hardness of the tested body, K_v is the correction coefficient, HV is the measured hardness of the tested body or the indicated hardness. The correction coefficient for Vickers hardness is internationally standard, and the relevant departments in China also push forward the use of their numerical values, but no explanation of the physical meaning of these numerical values has been found yet. We have proposed that for press-in hardness, materials of the same hardness value have equal stress resistance to the durometer head. From this point of view can be extended out of the body surface hardness correction value is essentially indenter and measured body contact surface value (measured