《JIS-H-7505-2004-ENG.pdf》由会员分享，可在线阅读，更多相关《JIS-H-7505-2004-ENG.pdf（10页珍藏版）》请在三一文库上搜索。
1、J IS JAPANESE I N D USTRIAL STANDARD Translated and Published by Japanese Standards Association (OSTEC/ JSA) Method for evaluation of tensile properties of metallic superplastic materials using R-type specimen ICs 77.040.10 Reference number : JIS H 7505 : 2004 (E) PROTECTED BY COPYRIGHT Copyright Ja
2、panese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 02:50:58 MDTNo reproduction or networking permitted without license from IHS -,-,- H 7505 : 2004 Foreword This translation has been made based on the ori
3、ginal Japanese Industrial Standard established by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee according to the proposal of establishing a Japanese Industrial Standard from The Foundation of Osaka Science 1273 5.2 Heating apparatus
4、For heating a test specimen, use a heating furnace equipped with a temperature regulator which is capable of heating the test specimen uniformly over the whole range between the test specimen and the chuck, keeping the tem- perature constant within the tolerable range in Table 1 all through the test
5、. However, the tolerable range of a temperature 5 473 K or 1 273 K shall be as agreed upon between the manufacture and the purchaser. Table 1 Tolerable range of test temperature Unit: K 5.3 Temperature measuring apparatus A temperature measuring apparatus comprises a measuring device and a thermocou
6、ple and shall be as follows: a) Measuring device For a measuring device, that sufficiently guaranteeing that a test temperature is within the tolerable range of 5.2 over the whole range of measuring temperature, shall be used. b) Thermocouple A thermocouple specified in JIS C 1602 shall be used. Fur
7、- ther, that sufficiently durable for a temperature at which it is used shall be used. When a temperature measuring device other than the thermocouple is used, that having a precision of at least equal to the thermocouple shall be used. 6 Test method 6.1 Measurement of a temperature shall be as give
8、n in JIS Z 8704. The temperature of the test specimen during the test shall be kept within the tolerable range of 5.2. The temperature raising time and the soaking heat-holding time shall be as agreed upon between the manufacturer and the purchaser. Test temperature 6.2 Test procedure The test proce
9、dure shall be as follows: a The dimensions of a test specimen shall be measured in a precision of at least 0.01 mm. b) The gauge length for obtaining superplastic elongation shall be 6 mm at the centre of an R part as given in Fig. 1. The gauge length before the test shall be measured in a precision
10、 of 0.01 mm. A test specimen shall be fixed with a grip device. Further, during the test, only the densile force in an axial direction shall be added thereto. The tensile test shall generally be carried out under conditions of a constant tensile speed. c) d) PROTECTED BY COPYRIGHT Copyright Japanese
11、 Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 02:50:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 H 7505 : 2004 e) During the test, measure the change of a tensile force wi
12、th a suitable measur- ing device. 7 Method for obtaining superplastic elongation and m value 7.1 Superplastic elongation Obtain the superplastic elongation by the follow- ing formula. Round off the significant figures to two places in accordance with JIS Z 8401. x 100 1 - lo 6= - 10 where, 6 : super
13、plastic elongation (elongation at break) (Oro) I : gauge length after rupture lo : gauge length 7.2 Strain rate sensitive exponent (m value) Determine an m value as follows from the result of a break test on at least two test specimens carried out at different tensile speeds. For the elongated amoun
14、t of R part at which the test is interrupted, ALR = 3 mm k 0.5 mm is specified. Further, select the minimum or the maximum tensile speed so that they differ from each other by two to ten times. For each test, obtain a distortion stress oi3 and a true strain speed ki at each scale by the pro- cedure
15、from a) to g) as follows: Deformation stress o (N/mm2 or MPa) generally increases by increase of the strain speed 2 (s-1). When the relation is represented by o = K.?, m is a strain rate sensitive exponent or simply an rn value. Where, K is a constant, and rn is defined by rn = dlog,/alogt. Remarks
16、: Fig. 2 Scale to be provided at R part a) Provide five scales at 3 mm intervals in the tensile axis direction at the centre of the R part so that when the test specimen, for convenience, is placed with the tensile axis horizontal as given in Fig. 2, scale at the minimum sectional area position at t
17、he centre is designated O, scales on the left side 1-61, -31 and scales on the right side +31, +61. Measure the R part width Woil (i = -6, -3, O, +3, +6) before the test at each scale and the sheet thickness toi. From the obtained results, calculate the sectional area Ao il at each scale. b) PROTECT
18、ED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 02:50:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 5 H 7505 : 2004 c) Carry out the tensile t
19、est, interrupt it when the R part elongation amount ALR reaches 3 mm and obtain the tensile force P just before interruption of the test. Measure the R part width W il and sheet thickness t il after the test at each scale. From the obtained results, calculate sectional area A il at each scale. Calcu
20、late the deformation stress oi at each scale and the true strain E i ac- cording to the following formula: d) e) P oil = - A il f) The true strain speed at each scale 2 il is a value obtained by dividing the true strain E il obtained in e) by the duration z from the start of the test to the in- terr
21、uption. For tests at two or more classes of different tensile speeds, a deformation stress o i and a true strain speed 2 il at each scale are given on both logarithmic axes as given in Fig. 3 and are straight line regressed by the method of least square and calculate an rn value as the inclination t
22、o two decimal places. In that case, since data at each section is treated as an equal value, obtain a regression straight curve by applying two times the weight to the data of the scale O. g) VV V i 0 Tensile speed ( m * S- ) 5 . 0 v 1.7 x + 1.7 x 0 1.7 x 1 0 - Fig. 3 Example of relation between def
23、ormation stress- true strain speed 8 Report 8.1 Mentioned items A part or all of the following items shall be selected to be mentioned on a test report subjected to the agreement between the manufacturer and the purchaser. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by I
24、HS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 02:50:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 6. H 7505 : 2004 Test materials 1) Manufacturers name 2) Name of materials 3) Class or symbol 4) Manufacturing n
25、umber Dimensions of test specimen Outline of test apparatus Test conditions i) Test temperature 2) Tensile speed 3) Test atmosphere Test results i) Superplastic elongation 2) Maximum nominal stress 3) 4) Additional items The following items should preferably be appended to the Relation between nomin
26、al stress and R part elongation amount m value (within measured true strain speed) test report. a) Test materials i) Working conditions 2) Heat treating conditions 3) Chemical composition Grain size of raw materials Mechanical properties at room temperature of raw materials Conditions for extracting
27、 test specimen from the raw material b) c) d) e) Test conditions i) Temperature raising speed 2) Soaking hold time PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 02:
28、50:58 MDTNo reproduction or networking permitted without license from IHS -,-,- Errata for JIS (English edition) are printed in Srundardizarion Journal, published monthiy by the Japanese Standards Association, and also provided to subscribers of JIS (English edition) in MonthZy Informarion. Errata w
29、ill be provided upon request, please contact: Standardization Promotion Department, Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN TEL. 03-3583-8002 FAX. 03-3583-0462 100% Recycled paper PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 02:50:58 MDTNo reproduction or networking permitted without license from IHS -,-,-