Design of utility tools and their application for testing mechanical properties of metallic materials

Zhen Yang; Xiaoyong Fang; Yanmei Shi; Fengmao Chen; Chuanguo Xu; Wei Wang

doi:10.3139/120.111051

Article

Design of utility tools and their application for testing mechanical properties of metallic materials

Zhen Yang , Xiaoyong Fang , Yanmei Shi , Fengmao Chen , Chuanguo Xu and Wei Wang

Published/Copyright: July 10, 2017

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From the journal Materials Testing Volume 59 Issue 7-8

Abstract

This paper deals with the design of a series of tools which could assist the preparation of samples, the positioning and the measurement to resolve the problems that exist in mechanical properties testing. In order to decrease the operational difficulty and improve the quality of preparation, two kinds of fixtures are made to clamp the hardness sample and be used to grind or polish by the grinder. For the measurement of percentage elongation after fracture and percent reduction of area, a special device is assembled to quickly splice the fractured test pieces. By applying a single transverse fastening force, the efficiency of splicing of the test pieces can be increased substantially and it provides enough operation space for the vernier caliper. To raise the placing efficiency and avoid the dragging of Charpy impact test piece, a special gripping plier is designed to ensure the coincidence of the plane of symmetry of the notch and the swing plane of the striker. By using the supports of testing machine and separating the function of alignment and fixation, the new structure resolves the matters of existing method as unsatisfied placing effect or dragging of the test piece. In order to accurately install the fixtures of electro-hydraulic servo fatigue test system, a set of positioning brackets and plate tool are made to adjust the location of the large base and check the deflection between the fixtures.

Kurzfassung

Der vorliegende Beitrag behandelt das Design einer Serie von Werkzeugen, die die Probenvorbereitung, die Positionierung und die Messung unterstützen können, um Schwierigkeiten in der Prüfung der mechanischen Eigenschaften von Werkstoffen zu beseitigen. Zur Reduzierung der Schwierigkeiten und zur Verbesserung der Qualität der Probenvorbereitung, wurden zwei Arten von Probenaufnahmen hergestellt, um zum einen die Härteprobe einzuspannen und zum anderen um sie mittels Schleifmaschine zu schleifen und zu polieren. Für die Messung der prozentualen Verlängerung nach dem Bruch und der prozentualen Querschnittsreduktion wurde eine spezielle Vorrichtung montiert, um die gebrochenen Probenteile schnell zu verbinden. Durch das Aufbringen einer einzigen Befestigungskraft in Querrichtung kann die Effizienz der Verbindung der Probenteile erheblich gesteigert werden und es wird genügend Bewegungsfreiraum für die Messschieberfunktion zur Verfügung gestellt. Um die Einsatzeffizienz zu erhöhen und um ein Verschieben von Charpy-Proben zu vermeiden, wurde eine spezielle Greifzange entworfen, die die Übereinstimmung der Symmetrie der Fläche unter der Kerbe mit der Ebene des Schwinghammers absichert. Unter Verwendung der Aufnahmen der Prüfmaschine und unter Trennung der Funktion der Aussrichtung und der Befestigung konnte die neue Struktur die Nachteile des bisherigen Verfahrens beseitigen, und zwar die Auswirkungen einer nicht zufriedenstellenden Positionierung sowie einer Verschiebung der Probe. Um die Befestigungen einer elektro-servohydraulischen Schwingprüfmaschine zu installieren, wurde ein Satz von Positionierkalmmern und eine Werkzeugplatte hergestellt zur Anpassung der Stellung der großen Basis und zur Kontrolle der Abweichung zwischen den Befestigungen.

*Correspondence Address, Prof. Dr. Xiaoyong Fang, School of Science, Yanshan University, Qinhuangdao, 066004, P. R. China, E-mail: fang@ysu.edu.cn

Dipl.-Ing. Zhen Yang, born in 1982, studied Applied Physics at Yanshan University in Qinhuangdao, China, from 2002 to 2009. Currently, he is working as a mechanical engineer at the quality inspection center of China National Petroleum Corporation Jichai Power Equipment Company in Jinan, China.

Prof. Dr. Xiaoyong Fang, born in 1963, studied Applied Physics at Yanshan University in Qinhuangdao, China. Currently, he is teaching and researching semiconductor materials and devices. As the academic leader of Hebei province microstructure material physics key lab, he is dedicated to studying the physical performance of ‘ nano-structure of compound semiconductors.

Dipl.-Ing. Yanmei Shi, born in 1986, studied Technology of Testing at Nanjing Forestry University, China, and since 2012, she is test engineer at Jinan Military General Hospital in Jinan, China.

Prof. Fengmao Chen, born in 1967, studied Technology of Testing at Nanjing Forestry University, China. Currently, he is Vice-President of the College of Forestry at Nanjing Forestry University, China.

Chuanguo Xu, born in 1964, studied Technology of Disel Development and Testing at China National Petroleum Corporation Jichai Power Equipment Company in Jinan, China. Currently, he is Vice-President of the Jichai Power Equipment Company, China.

Wei Wang, born in 1982, has been working on metallic materials testing at the China National Petroleum Corporation Jichai Power Equipment Company in Jinan, China, since 2011. Currently, he is Director of the Physical and Chemical Laboratory of Jichai Power Equipment Company, China.

References

1 A. S.Ruhl, A.Göbel, H. J.Kühn, A.Kranzmann: Materials testing under mechanical stress, pressure and turbulent flow of impure supercritical CO₂, Materials Testing55 (2013), pp. 158–16210.3139/120.110428Search in Google Scholar

2 P.Reynolds: Experimental techniques: Developments, applications and tutorials in experimental mechanics techniques, Experimental Techniques40 (2016), pp. 1–210.1007/s40799-015-0001-9Search in Google Scholar

3 R.Suzuki, T.Kaburagi, M.Matsubara, T.Tashiro, T.Koyama: Hardness measurement for metals using lightweight Herbert pendulum hardness tester with cylindrical indenter, Experimental Techniques40 (2016), pp. 795–80210.1007/s40799-016-0080-2Search in Google Scholar

4 P.Larour, J.Noack, W.Bleck: Vibration behaviour of servohydraulic dynamic tensile testing machines, Materials Testing51 (2009), pp. 184–19810.3139/120.110025Search in Google Scholar

5 M.Endo, S.Okazaki, H.Matsunaga, S.Moriyama, K.Munaoka, K.Yanase: A new fatigue testing machine for investigating the behavior of small shear-mode fatigue cracks, Experimental Techniques40 (2016), pp. 1065–107310.1007/s40799-016-0102-0Search in Google Scholar

6 M. B.Hoechst, S.Issler: How to deal with very high cycle fatigue (VHCF) effects in practical applications, Materials Testing54 (2012), pp. 742–74510.3139/120.110387Search in Google Scholar

7 U.Schmälzle: Fatigue and aircraft in-service, Materials Testing53 (2011), pp. 721–72710.3139/120.110280Search in Google Scholar

8 Z.Yang, W.Wang, Y.Guo, L. H.Gu, Z. L.Yu, S. L.Wang: Application and research of high power diesel engine connecting rod fatigue test system, Chinese Internal Combustion Engine Engineering36 (2015), pp. 109–11410.13949/j.cnki.nrjgc.2015.05.019Search in Google Scholar

9 BS EN 10002-1: Metallic Materials – Tensile Testing – Part 1: Method of Test at Ambient Temperature, BSI, London, UK (2001)Search in Google Scholar

10 Z.Yang, Y.Guo, W.Wang, Z. L.Yu, S. L.Wang, H. L.Pei, T. T.Xu: A centering positioning tool for notch specimen's impact test, Physical Testing and Chemical Analysis Part A: Physical Testing52 (2016), pp. 251–25210.11973/lhjy-wl201604008Search in Google Scholar

Published Online: 2017-07-10

Published in Print: 2017-07-14

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https://doi.org/10.3139/120.111051