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| Discussion on direct current electric potential
difference method in GB/T 21143-2014 |
| Xiaoyang,LIU Lanzhou,ZHAO Renwei,LI Chunjian |
| NCS Testing Technology Co., Ltd., Beijing 100081, China |
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| Guide |
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Abstract Direct current electric potential difference (DCEPD) method is one of recommended methods in GB/T 21143-2014 for the determination of quasistatic fracture toughness. In some cases, it can be used for the auxiliary measurement of sample which is inconvenient to be tested by the common compliance method. To verify the actual effect of DCEPD method in fracture toughness measurement, the fracture toughness of sample was tested according to the DCEPD method specified in standard, and the measuring results were compared with the compliance method. It was found that the Method 1 in GB/T 21143—2014 (i.e., indirect measurement method) was more convenient and accurate to measure the length of cracks, and the results were consistent with those obtained by the compliance method. For the Method 2 (i.e., direct measurement method), it was not easy to control the measurement accuracy of cracks in actual test, and both the accuracy and convenience were inferior to the Method 1.
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Received: 18 May 2021
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2022, Vol. 40 
