FED-STD-228A
5. RESULTS
5.1 Calculation.
5.1.1 The tensile strength of the specimen shall be calculated as follows:
Tensile strength, p. s. i.= 4F
š(D)
2
where:
F=the maximum force required to break the specimen, pounds.
D=the minimum diameter of wire, inch.
5.1.2 The elongation of the specimen shall be calculated as follows:
For wire 0.208 inch diameter or greater:
Elongation, percent = L-10 x 100
10
where:
L=the distance between bench marks on the specimen immediately after rupture, inches
For wire less than 0.208 inch in diameter:
Elongation, percent = Lt-L0 x 100
L0
where:
Lt=the distance between grips of the testing machine at the time of rupture of specimen, inches.
L0=the distance between grips of the testing machine when the specimen is under a stress equal to 10
percent of the specified tensile strength, inches.
5.2 Unless otherwise specified in the detail specification, three specimens from each inspection unit shall
be tested.
5.3 The tensile strength or elongation of the conductor or wire of the inspection unit shall be the average
of the results obtained from the specimens tested.
5.4 The tensile strength of the conductor or wire of the inspection unit shall be recorded to the nearest 10
pounds per square inch.
5.5 The elongation of the conductor or wire of the inspection unit shall be recorded to the nearest 0.05
percent for 10-inch specimens and to the nearest 0.01 percent for 60-inch specimens.
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