Outline of program
We obtain strength properties for space use materials and publish data sheets after evaluation of those data.
The materials, sampling, welding and testing methods are discussed in detail by the NIMS Technical Advisory
Committee on Space Use Materials Properties. First, a 5-year testing program on the mechanical properties of
tensile, Charpy impact, fatigue and fracture toughness was determined.
shows a temporary publication schedule and contents of the data sheet.
To verify the influence of the sampling location and aeolotropy on the material properties,
samples were taken from both the inner part and the outer side of all blocks except for the large-size
samples for the fatigue test and, in addition, samples in the axial and radial direction were taken
for the tensile test and impact test pieces.
All samples were obtained by electric discharge machining.
Data were obtained under the ISO 9001 Quality Management Systems using the following testing standards:
JIS Z 2277(2000) Tensile Testing Method for Metallic Materials in Liquid Helium, JIS Z 2241(1998)
Tensile Testing Method for Metallic Materials, JIS Z 2242(1998) Method of Impact Test for Metallic
Materials, ASTM E 813(1989) Test Method for JIc, A Measure of Fracture Toughness and ASTM E 399(1997)
Test Method for Plain-Strain Fracture Toughness of Metallic Materials.
Table 3 lists the testing machines for these data sheets. Most machines are installed in NIMS.
Fatigue tests at 113K were carried out in NASDA and the tests at 20 K were performed in Nippon Steel
Corporation using a machine belonging to NEDO. Examples of testing machines at 4K for tensile,
Charpy impact and fatigue tests are presented in Photo 1 a) to c)
Table and Photographs
Table 1. Publication Schedule for the Data Sheet Program
|Ti-5Al-2.5Sn ELI large billet||Fatigue, KIc, Charpy, tensile||2003/1|
|Ti-5Al-2.5Sn ELI smaller billet||Fatigue, KIc, Charpy, tensile||2004/1|
|Alloy 718 . wrought and cast||Fatigue, KIc, Charpy, tensile||2004/3|
|Alloy 718 EB,955ST||Low-cycle fatigue, KIc, tensile||2003/2|
|Alloy 718 EB||High-cycle fatigue, KIc, tensile, da/dn||2004/3|
Table 2. Testing Facilities
|Type of machine||Temperature||Capacity||Number available|
|Tensile test||10 ton||1|
|Charpy impact||500 J||1|
|Fracture toughness||50 kN||1|
|Fatigue test||494℃||10 ton||1|
|Fatigue test||600℃||10 ton||1|
|Fatigue test||113K||10 ton||1 (NASDA)|
|Fatigue test||20K||10 ton||1 (NSC)|
a) Grips and extensometers for tensile test at cryogenic temperatures
b) Charpy impact testing at liquid helium temperature(4K).
c) Fatigue testing machine with a helium refrigerator for long-term testing at liquid helium temperature.