9.3.1
RECOMMENDED PROCEDURES —This section specifies the procedure for submission of mechanical property data for statistical analysis; specifically data supplied for the determination of T99 and T90 values for Ftu and Fty and for data supplied to obtain derived property values for Fcy, Fsu, Fbru and Fbry. The amount of data to be supplied for both of these are indicated in other sections of Chapter 9, such as Table 9.2.4.1 for derived property values. This section covers the format for submission of data.
9.3.2
COMPUTER SOFTWARE — The data may be supplied on 3.5 inch disks or CD-ROM in a PC-compatible format. The data files may also be submitted as attachments to an e-mail message. It is recommended that the software applications in Table 9.3.2 be used to construct the data files. Along with the electronic version, provide a hard (paper) copy of the data and any other supporting documentation such as specimen dimensions, gage length etc. This information will be stored in the MIL-HDBK-5 archives for future reference. Company-specific data will be treated as proprietary information at the request of the submitting organization.
Table 9.3.2. Software Applications for Data Submission
- • ASCII text editor
- • Current Spreadsheet or Database Applications
- • The Chairman or Secretary of MIL-HDBK-5 can be contacted concerning software compatibility questions.
The data supplied on these disks or sent by e-mail are to be supplied in English units. For example, physical dimensions should be reported in units of inches to the nearest thousandth of an inch (X.XXX), stress should be reported in units of ksi to the nearest one hundredth of a ksi (X.XX), strain is to be reported in percent to the nearest tenth of a percent (X.X) and modulus is to be reported in units of 10³ ksi to the nearest tenth of a msi (X.X). If necessary, refer to Table 1.2.2 to convert to English units of measure.
9.3.3
GENERAL DATA FORMATS — Table 9.3.3 shows the information that should be supplied in electronic form along with the mechanical test results. The alloy type, temper/heat treatment, product form, specimen location and specification number will be identified. Columns (or data fields), in order, will contain grain direction, product thickness, unit of product thickness, lot number, and heat number. Columns will be added towards the right of the heat number and will containthe individual test results as discussed in Sections 9.3.3.1 and 9.3.3.4.
When specifying grain direction for wrought product strengths, etc., use the conventions identified in Table 9.2.4.3: L for longitudinal, LT for long transverse, and ST for short transverse. Products that are anticipated to have significantly different properties in directions other than those stated above should be tested in the appropriate directions and the results reported.
There are several types of product forms identified in the Handbook; therefore, the term product form should be properly defined and reported in this column. Examples for wrought products are sheet, plate, bar, and forging. Examples for cast products are sand casting, investment casting, and permanent mold casting. For wrought products, specimen location should be t/2 or t/4. For cast products, specimen location should indicate designated or nondesignated areas.
MIL-HDBK-5J
31 January 2003
Table 9.3.3. General Data Format
Alloy Trade Name
Temper/Heat Treatment
Product Form
Industry/Government Specification No.
| Grain Direction | Product Thickness | Unit (in.), or Area (in.2) | Lot No. | Heat No. | Specimen Location (or Designation) | TUS, ksi | TYS, ksi | CYS, ksi | e, % |
|---|---|---|---|---|---|---|---|---|---|
9.3.3.1
Data Format for the Computation of and Values — The tensile test results that are to be reported for determination of A and B-basis properties are tensile ultimate strength (TUS), tensile yield strength (TYS), elongation (e), reduction of area (RA), and elastic modulus. The results of these tests are to be reported as shown in Table 9.3.3.1 along with alloy designation, specification, lot and/or heat number, product thickness, grain direction, etc. as previously shown in Table 9.3.3. The number of tests required for determining A and B-basis properties are identified in Section 9.2.4.1.
9.3.3.2
Data Format for Derived Properties — For the derived property values, several types of tests may be conducted such as tensile, compression, shear and bearing, as shown in Table 9.2.4.1. The results of these tests are to be reported as shown in Table 9.3.3.2 along with alloy designation, specification, lot and/or heat number, product thickness, grain direction, etc. as previously shown in Table 9.3.3. The ultimate strength properties are to be contained in one file as shown in Table 9.3.3.2(a) while the yield strength properties are to be contained in another file as shown in Table 9.3.3.2(b).
Generally, two tests are preferred (one required) for a given test type and product thickness. The results of these tests are to be reported in columns adjacent to each other. For example, TUS Test #1 and TUS Test #2 are on the same row for a given thickness and heat. An additional column should be created to report the specimen number for the second test. This column should be just to the left of the test result. The same procedure is to be used for the other properties. The abbreviations (see Appendix A) for the other test types are CYS for compressive yield, SUS for shear ultimate, and BUS and BYS for bearing ultimate and bearing yield strengths, respectively. For the bearing properties, also identify the e/D ratio of either 1.5 or 2.0.
| Alloy Trade Name | The information to be entered be-tween these two columns | Heat No. | Lot N. | UTS, ksi | TYS, ksi | Elongation % | Red. of Area, % | Elastic Modulus, ksi |
|---|---|---|---|---|---|---|---|---|
| depends upon the product form, see Table 9.3.3. | ||||||||
| Alloy Trade Name | Heat No. | Lot No. | TUS Test 1 | TUS Test 2* | SUS Test 1 | SUS Test 2* | BUS e/D=1.5 Test 1 | BUS e/D=1.5 Test 2* | BUS e/D-2.0 Test 1 | BUS e/D=2.0 Test 2* | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| The information to be en-tered between these two columns depends upon the product form, see Table 9.3.3. | |||||||||||
- Two tests are preferred, only one is required.
| Alloy Trade Name | Heat No. | Lot No. | TYS Test 1 | TYS Test 2* | CYS Test 1 | CYS Test 2* | BYS e/D=1.5 Test 1 | BYS e/D=1.5 Test 2* | BYS e/D=2.0 Test 1 | BYS e/D=2.0 Test 2* | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| The information to be entered between these two | |||||||||||
| [ ] | |||||||||||
| columns depends upon the product form, see Table 9.3.3. | |||||||||||
*Two tests are preferred, only one is required.
MIL-HDBK-5J
9.3.3.3
Data Format for the Construction of Typical Stress-Strain Curves — The individual tensile and compression stress-strain data should also be submitted in electronic form, if possible, so that typical tensile and compression stress-strain curves, compression tangent-modulus and typical (full-range) stress-strain curves can be constructed. In order to construct a typical stress-strain curve, the individual specimen curves must be documented up to slightly beyond the 0.2 percent offset yield strength. To construct a typical (full-range) stress-strain curve, the individual curves must be documented through to failure.
The data for the stress-strain curves must be supplied on separate electronic media from the mechanical property data. The data should be stored in a file which contains the load (or stress) in the first column and the displacement (or strain) in the second column. Each load or displacement stress-strain pair should be identified with its corresponding specimen identification number.
For the load-displacement curves, the load should be reported in pounds (X.) and the displacement should be reported in units of thousandth of an inch (X.XXX). For stress-strain curves, the stress should be reported to the nearest hundredth of a ksi (X.XX) and strain should be reported to the nearest X.XX x10-6 units.
A hard copy of the load displacement curve should also be submitted for each stress-strain curve.
9.3.3.4
Data Format for Fasteners — A report will be submitted to MIL-HDBK-5 Coordination Group summarizing the test program, results, analysis, and suggested table of joint allowables for MIL-HDBK-5. The following information will be provided in the report:
- (1) A description of sheet and plate material with heat-treatment details and mechanical property test data for each sheet thickness used in the program in accordance with the requirements of Section 9.2.4.6.3.
- (2) A description of fastener, including drawings and specifications. If the fastener is not covered by a government or industry specification, a copy of an appropriate draft specification will be attached to the report.
- (3) A statement of compliance with NASM 1312, including a detailed statement of any differences from this standard.
- (4) Basic test data [see Figure 9.7.1.4(a)], including that required in NASM 1312, and representative load deflection curves.
- (5) Values for fastener shear calculation: as defined in Section 9.7.1.3 and fastener shear stress curves, where applicable.
- (6) Designation of allowable shear strength reliability (90 or 99 percent value).
- (7) Calculated t/D, P_u/D^2, and P_y/D^2 values [see Figure 9.7.1.4(a) for sample format].
- (8) Seven or more graphs, as required, of P/D² versus t/D, as described in detail in Section 9.7.1.4, including the proposed design allowable curves for yield and ultimate load.
- (9) Calculations of allowable loads (see Figure 9.7.1.5 for sample format).
- (10) The suggested allowable load tables in the format shown in Section 9.9.5.
MIL-HDBK-5J
9.3.3.5
Data Format for Other Properties — Data submission format for data types not discussed in Section 9.3.3.1 through 9.3.3.4 have not been standardized. The Chairman or Secretary of MIL-HDBK-5 can be contacted concerning most convenient data submission formats.