G. Aggag

National Institute of Standards

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Toshio MADA

Kyushu University

A. E. Abuelezz

National Institute of Standards

M. I. Mohamed

Misr University for Science and Technology

K.M. Khaled

Qatar University

Kiyoshi Takahashi

Takasago (Japan)

M. El‐Sherbiny

Cairo University

Andy Knott

National Physical Laboratory

Dieter Schwenk

Materialprüfungsamt NRW (Germany)

Febo Menelao

Physikalisch-Technische Bundesanstalt

Kiyoshi Takahashi

Okayama Medical Center

Cooperative Institutions

National Institute of Standards

Tokyo Institute of Technology

Physikalisch-Technische Bundesanstalt

Kyushu University

Takasago (Japan)

Chikamori Hospital

Ōtani University

Pohang University of Science and Technology

Cairo University

Materialprüfungsamt NRW (Germany)

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Dependence of Dynamic Fracture Toughness of Polycarbonate on Impact Velocity

大会講演概要集 (1996)

G. Aggag Toshio MADA Kunio Takahashi

Polycarbonate

Source

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Citations (0)

Construction of a Dynamic Displacement Measurement Apparatus and Its Application to Impact Fracture Studies.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A (1997)

Toshio MADA Kiyoshi Takahashi Philippe Béguelin G. Aggag

An apparatus for measurement of the dynamic displacement of a subject has been constructed. It consists of a position sensing detector (PSD), optical fiber and He-Ne laser light source. One end of the fiber is coupled with the light source and the other end is mounted on the moving subject. The laser light from this fiber end on the subject is focused on the PSD which is used to evaluate the change in the subject displacement. The characteristic frequency response of the apparatus has been studied in detail and is concluded to be as high as 100 kIlz. The apparatus was used in an impulsive three-point bend test for notched PC specimens and showed excellent serviceability for impact studies.

Serviceability (structure)

10.1299/kikaia.63.1431

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Citations (8)

Commissioning NIS 1 kN·m Primary Torque Standard Machine

MAPAN (2022)

K.M. Khaled G. Aggag

Abstract The presented work shows the design and evaluation of the NIS 1 kN·m primary torque standard machine. The machine covers the range up to 1000 N·m with a very wide range of torque steps thanking different 4 mass stacks. The machine has a double-side lever arm with half-moon ends to provide calibration in the clockwise and anticlockwise directions. An air bearing was used as a fulcrum to provide a low friction coefficient. FEA was used in the design and optimization process of the lever arm. The relative expanded uncertainty of the machine is 0.03% which is proved by recalibration of two reference torque transducers of 200 N·m and 1000 N·m capacity. All En values are less than unity, which reveals the competence of the developed machine.

Lever

Clockwise

Machine design

10.1007/s12647-022-00593-y

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The dynamic behavior of metal-matrix composites under low-velocity impact

Composites Science and Technology (2000)

Hong‐Gil Nam G. Aggag Kazuhiro Takahashi Kap Su Han

10.1016/s0266-3538(99)00191-8

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Citations (20)

Friction and wear properties of polymeric composite materials for bearing applications

Wear (1995)

A. A. EL-SAYED M. El‐Sherbiny Aly Abo-El-Ezz G. Aggag

Volume fraction

Coefficient of friction

10.1016/0043-1648(94)06546-2

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Citations (161)

Comparison of force standards between NIS-Egypt and NPL - United Kingdom.

Andy Knott Maulana Ibrahim Ehsan Ul Hasan G. Aggag

This paper details the results of a bilateral comparison carried out between the national force standard machines of Egypt and the United Kingdom. The results indicate that the uncertainty claims of the two laboratories can, in general, be supported. Recommendations on revised protocols to be used for future comparisons are given.

Kingdom

Source

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Citations (1)

Study of creep behavior of load cells

Measurement (2009)

M. I. Mohamed Ebtisam H. Hasan G. Aggag

Load cell

Constant (computer programming)

10.1016/j.measurement.2009.03.001

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Citations (15)

Investigation of a group standard of Rockwell diamond indenters*

HTM Journal of Heat Treatment and Materials (2008)

Dieter Schwenk Konrad Herrmann G. Aggag Febo Menelao

Abstract The specific hardness deviations of a Rockwell diamond indenter can be determined by a group standard, consisting of several indenters, using correction functions. In this paper the establishment of an HRC group standard in the PTB and comparative investigations of the group standards in the PTB and the calibration laboratory MPA NRW are reported. Above all the group standard is advantageous for maintaining the stability of the Rockwell hardness scales.

Rockwell scale

10.3139/105.100457

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Citations (4)

EUROMET.M.F-S1: Comparison of force standards between NIS (Egypt) and NPL (United Kingdom)

Metrologia (2006)

Andy Knott A. E. Abuelezz Mohd Adib Ibrahim E. H. Hasan G. Aggag

This report details the method and results of a bilateral comparison carried out between the national force standard machines of Egypt and the United Kingdom, in the range from 5 kN to 5 MN. The results are analysed using the En ratio technique and indicate that the uncertainty claims of the two laboratories can, in general, be supported. A number of recommendations on revised protocols to be used for future comparisons are also given. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by EUROMET, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).

Kingdom

10.1088/0026-1394/43/1a/07004

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Citations (1)

Rate Dependent Impact Fracture Toughness Analysis for Brittle Materials

Journal de Physique IV (Proceedings) (1997)

Kiyoshi Takahashi G. Aggag Toshio MADA

Brittleness

Brittle fracture

10.1051/jp4:19973174

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Citations (1)