A novel methodology to determine needle position for DC potential difference method to evaluate hardening depth from surface

Akira Sasamoto; Takayuki Suzuki; Masahiro Iwata; Natsuko Ike; Tatsuya Kaneda

doi:10.1117/12.2013654

16 April 2013 A novel methodology to determine needle position for DC potential difference method to evaluate hardening depth from surface

Akira Sasamoto, Takayuki Suzuki, Masahiro Iwata, Natsuko Ike, Tatsuya Kaneda

Author Affiliations +

Proceedings Volume 8694, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013; 869420 (2013) https://doi.org/10.1117/12.2013654
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2013, San Diego, California, United States

Abstract

DC potential difference method are simple and fast non destructive testing method. It measures voltage between two points on surface touched by each needle. In some kind of engineering structural member, neighborhood of iron surface is required to have higher hardness than normal iron ’s one. To meet this demand, quench hardening process is a popular process to make iron hard from surface and hardening depth is important parameter to be ensured in target member after process. Because quench iron increases its resistance by 20 %, D.C.potential method is able to be used for evaluating hardening depth. However output voltage was insensitive for change of deep hardening depth over 5.0mm, measurement would fail over 2.0 mm with improper needle array probe in reality. We developed a novel methodology to determine needle position to improve its applicability over 5.0 mm depth which is demanded in some member. In this methodology, needle position are optimized for cost function that is voltage gradient to hardening depth. Throughout this optimization, (1) an analytical expression of surface voltage which are obtained solve Laplace equation in three dimensional space. (2) CAS system (Maple / MAXIMA) . are invoked. Experimental data shows good coincidence to those numerical computation, and monotone increasing property of voltage to depth are kept up to 10 mm hardening depth. Proposed needle positions have made DC potential difference method possible to evaluate hardening depth over 5.0 mm. The algorithm is most likely to work well with only one response function for this type probe.

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Akira Sasamoto, Takayuki Suzuki, Masahiro Iwata, Natsuko Ike, and Tatsuya Kaneda "A novel methodology to determine needle position for DC potential difference method to evaluate hardening depth from surface", Proc. SPIE 8694, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013, 869420 (16 April 2013); https://doi.org/10.1117/12.2013654

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KEYWORDS

Iron

Resistance

Mirrors

Mathematical modeling

Optimization (mathematics)

Testing and analysis

Data processing

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