Pf - Defense Technical Information Center - MECHANICAL PROPERTIES, ... table are those publiihed in...

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Transcript of Pf - Defense Technical Information Center - MECHANICAL PROPERTIES, ... table are those publiihed in...

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MECHANICAL PROPERTIES, INCLUDING FRACTURE TOUGHNESS AND FATIGUE, AND RESISTANCE TO

STRESS-CORROSION CRACKIM} OF STRESS- RELIEVED STRETCHED ALUMINUM ALLOY EXTRUSIONS

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D. J. Brownhill, R, E. Davies D. 0. Sprowls

Contract No. AF53(6l5)-3580 BPSN: 66 (687581-738106-6240551^)

Fourth Quarterly Report Dec. 15, 1966 - March 15, 1967

New Kensington, Pa. March 15, 1967

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APR 6 1967 * i U L^j—-U-JU u Lai-.

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■' ■

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NOTICE /

Ihls document may ndt be reproduced or published In

any form in whole or in part /without prior approval of the

Government. Since this Is a/progress report, the Information /

herein Is tentative and subject to changes, corrections and

modifications. '

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--T——,—

ABSTRACT

Die tensile and some compressive, shear, bearing,

fatigue and fracture-toughness properties of a total of 130

samples of 2014, 2024, 6o6l, 7075 and 7178 aluminum alloy-

extrusions In the TX51X and "heat-treated-by-user" tempers have

been determined. Ihe extrusions ranged In thickness from

0.050 to 6,500 In. Ratios among the tensile, corapresslve,

^ shear and bearing properties have also been computed.

Stress-corrosion tests of 18 samples of extrusions

have been completed.

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Table of Contents

I. Introduction 1

II. Jfaterlal 1

III. Procedure . 2

IV, Summary 4

V. TSables and Figures 6

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FOURTH QUARTERLY REPORT

MECHANICAL PROPERTIES, INCLUDING FRACTURE TOUGHNESS AND FATIGUE, AND RESISTANCE TO STRESS-CORROSION CRACKING OF

STRESS-RELIEVED STRETCHED ALUMINUM ALLOY EXTRUSIONS

I. Jntroductlon.

The tests being made under this contract are for use

in establishing design mechanical properties in MIL-KDBK-5A,

including stress-strain and tangent-modulus curves, for 201,4,

2024, 606l, 7075, 7079 and 7278 aluminum alloy extrusions in

the TX51X tempers. For comparison, a limited number of similar

() . tests are being made of extrusions in the "heat-treated-by-user"

temper. Also, some fracture-toughness, axial-stress fatigue

and stress-corrosion tests are being made.

This Fourth Quarterly Report summarizes the results

of tensile, compressive, shear, bearing, fatigue, fracture

toughness and stress-corrosion tests made to date on 102 samples

in the TX51X temper and on 28 samples in the "heat-treated-by-

user" tempers. Ihe samples ranged in thickness from 0.050 to 6,500

0 in.

II. Material.

A total of 110 samples of commercially-produced

extrusions in the TX51X temper and 18 samples in the 0 temper

have been received from two producers. The section thickness

and identification of each sample is shown in Table I. Eighteen

of the as-received samples in the 0 temper have been heat

treated, or heat treated and aged, in accordance with applicable

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2.

conditions in MIL-H-6088D. Five samples each of 2024-0 and

7075-0 were tested in two "heat-treated-by-user" tempers, so

that the total number of samples tested in those tempers is 28.

III. Procedure.

Mechanical Properties

Tensile, compressive, shear and bearing specimens were

taken at locations described in the Second Quarterly Report,

dated September 15, 1966. The general dimensions of these

specimens were shown in Pigs. 1 to 5» inclusive, of that report.

The testing procedures were as outlined in the First Quarterly

Report, dated June 15, 1966.

Tensile and compressive modulus and stress-strain

tests have been made of 27 samples of extrusions as described

in the Third Quarterly Report, dated December 15, 1966.

Fracture-toughness tests were made in accordance with

the methods described in ASTM STP 411* on fatigue-cracked

aingle-edge-notched specimens from the longitudinal and long-

transverse directions. The types of specimens are shown in

Pig. 1; the proportions cf these specimens are the same as those *

of specimens used by NASA, Lewis Research Center, The-fracture

parameters were calculated from relationships developed from

the NASA calibration.

Values of the critical plane-strain stress intensity

factor, Kjc, were calculated using two values of load from the

* W. P. Brown and J. E. Srawley, "Plane Strain Fracture Toughness Ttesting of High Strength Metals", ASTM STP 411, February, 1967.

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3.

fracture-toughness tests. Ihe first value was calculated using

the load at the initial burst of unstable crack growth, as

indicated by the initial significant deviation from linearity

in the load deformation curve. In reporting the data, the

degree of clarity of the Initial deviation has been indicated

by the use of the letter "P" to indicate a clear instability or

pop-in, the letter "I" to indicate a less pronounced but yet

abrupt initial deviation from linearity which is believed to be

a supressed pop-in, and "M" to indicate that the initial

deviation was at the maximum or fracture load. The second value «

was calculated using the load at a 5 per cent secant offset,

equivalent to about 2 pei1 cent of crack extension; this was

done as a result of recent recommendations of ASTM Committee

E-24* that the secant-offset method be considered for establish-

ing Kjc, and values thus determined are indicated in the table

with the letter "S", or the letters "^1" when the load at the

secant offset was the maximum or fracture load. Additional

analysis of the results will be necessary to establish the

O permanent validity of the numbers. No values of Kjc are

reported at this time for those materials (principally 2024-T551X

and 606I-T65IO) which exhibited no initial instability and/or

general yielding.

Some axial-stress fatigue tests have been made of

fourteen selected samples of extrusions. Procedures for making

these tests were described in the First Quarterly Report,

* "Draft Recommended Practice for Notch-Bend Fracture Toughness Testing", ASTM Committee E24, February, 1967,

o

Resistance to Stress Corrosion

Stress-corrosion tests are being made of 43 selected

samples of extrusions; of these, 31 are In the TX51X temper and

12 are in the "heat-treated-by-user" temper. Procedures for

making these tests were described In the First Quarterly Report.

IV. Summary.

TLie results of tensile, compresslve, shear and bearing

tests of 102 samples of extrusions li. 1 i TX51X temper are

shown, according to alloy and temper. In Tobies II through IX;

the corresponding properties for extrusions In the "heat-

treated-by-user" tempers are shown In Table X. The tensile «

properties of all samples exceed the values in applicable

Federal Specifications. Specified minimum tensile properties

for extrusions are shown in Table XI; the values shown in this

table are those publiihed in the Aluminum Association Booklet,

"Standards for Aluminum Mill Products", 1967. Some of these

values, as indicated in the table, are lower than those shown

presently in Federal Specifications. It is understood,

yJ however, that the values in "SAM?" will be in the next revisions

of the Federal Specifications.

The ratios among the tensile, compressive and shear

properties of the extrusions in the TX51X tempers and the "heat-

treated-by-user" tempers are shown in Tables XII and XIII,

respectively, and the ratios among the bearing and tensile

properties of the corresponding extrusions are shown in Tables

XIV and XV, respectively, Iha ratios among the properties at

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5.

different locations with regard to width and thickness are

shown in Table XVI. The ratios among bearing properties

obtained using edgewise specimens to those obtained using

flatwise specimens are shown in Table XVII,

The results of the fracture-toughness tests are shown

In Table XVIII and those of the axial-stress fatigue tests are

shown in Fig- . 2 through 6.

■Hie current status of the stress-corrosion tests is

given in Table XIX. The tests of specimens of 18 samples were

terminated after 84 days exposure, and tensile tests were made

of these specimens to determine losses in tensile strength as a

result of corrosion. The tests thus far indicate typical

performances for the various materials.

Because it is expected that more samples of each

alloy and temper will be tested, no analysis of the data already

obtained is being presented at this time.

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R. E. DAVIES

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TABI£ X (Concluded)

TABLE XI

SPECIFIED MINIMUM VALUES* FOR ALUMINUM ALLOY EXTRUSIONS [ÄP33(6l5)-3580j

Thickness, In.

Area, sq. in.

Tensile 1 Alloy and

Temper UlUimte Stress,

psl

Yield Stress,t

psl

Elongatior 2 in. or 41

*

Federal Speclflcatlc

2014-T62 «0.749 All 6ü 000 53 000 7 QQ-A-200/2b

-T65IO *e.4Q9 0.500-0.749

»0.750

All All «25

60 000 64 000 68 000

53 000 58 000 60 000

7 7 /

2024-T3510, -T3511"

«0.249 0.250-0.749 0.750-1.499

»l;500 »1.500

All All All «25 *25^32

57 000 60 000 65 000 70 000 68 000

42 000 44 000 46 000 52 000 48 000

12 \ 12 10 10 8

QQ-A-200/3b

-T42 «0.749 »1.500

All «25

57 000 57 000

38 000 38 000

12 10

-T85J.O, -T85II

0.050-0.249 0.250-1.499

»1.500

All All «32

64 000 66 000 66 000

56 000 58 000 58 000

4 5 5

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None

6061-T62*, -T65IO

5^0.249 »O.250

All All

38 000 38 000

35 000 35 000

8** I 10 J

Qft-A-200/Bb

7075-T62*, -T65IO

*o.249 0.250-0.499 0.500-2,Q99 3.000-4.499

All All All «20

78 000 81 000 81 000 81 000

70 000 73 000 72 000 71 000

7 7 7 7 >

> QQ-A-200/llb

-T73XJtt -T73510

^0.249 r,. 250-0.499 0.500-1.499 1.500-2.999

-

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>

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1

None

7079-T62,* -T65IO

«0.249 O.250-O.499

«20 «20

75 000 77 000

67 000 68 000 * } Qft-A-200/l2b

7178-T62* «0.061 O.250-I.499

«20 «20

79 ooo*# 82 ooo*#

73 000** 74 000**

5 5

QQ-A-200A3

-T6510 0.062-0.249 0.250-1.499

«20 ^25

84 000*» 87 000**

76 000** 78 000**

5 5

0

0

* All values are as shown In the Aluminum Association Booklet, "Standards for Aluminum Mill Products," I967.

t Offset equals 0.2 per cent. ♦ In Qft-A-200/Bb, lib, 12b and 13, values for T6 tewper apply also for extrusions heat treated

and aged by user (T62 temper;. ** Lower than In Federal specif lea tlona. ft "T73X" signifies T73-type tenqper for 7075 when heat treated and agsd by user. Standard

designation not yet assigned.

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to-,

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TABIE XIII

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100 800

57 S'(

Kl 6<x. 0.63 2» 800 » L - Loogitudlnal; T - Tranavaraa Nature of Pop-In Indloatloni N - Maximum Load

P - Clear Pop-in. below «axlaus load without aignlfloant prior devlatlCQ frm linearity I - Initial algnlfioant deviation frcm linearity 3-5 per oent aeoent offaat

At atart of rr&oeura toughneaa teat, i.e., after fatigue cracking rAB Criqbioed (P/A * Ma/I) atreaa at tip of oraok

tt HO,,, - Ki02 (1 . t») . I? J J7.59 J . J8 (J)Z + ll7 (J)^ j „f, ,3« fiTP ^n. K m aodulua of alaattolty, pal „ Ojo • plana-atraln strain-energy raleaae rate, in.-lb/ln.'i

Ej0 - plane-atrain atraaa-lntenalty factor, palyin. F ■ load, lb, at unatable crack growth B > thicknaaa, in. w • frroaa width, in.

• « Produoer B, all othm are Produ-er A

I'olaaon'c ratio - 0.33 for almilnun 1 •0 + S"!8 2 - actual crack lenclh. Ii r'«aya

oirreotlon factjr, tu. - tonal I« yield atreaa, pul

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