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2124-T851 Plate: MIL-HDBK-5J Design Allowables

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Material class	Aluminum
Alloy / temper / form	2124 / T851 / Plate
Specifications	AMS 4101 and AMS-QQ-A-250/29
Handbook	MIL-HDBK-5J, 31 January 2003, section 3.2.7.0, Table 3.2.7.0(b) (pdf page 158 of the chapter file)
Dimension bands	6
Density	0.1 lb/in3

Design Mechanical and Physical Properties (room temperature)

As printed in the handbook table. Bases: A and B are statistical minimums (99 % and 90 % probability at 95 % confidence), S the specification minimum. Grain directions: L longitudinal, LT long transverse, ST short transverse.

Dimension band		1.000–1.500 in	1.501–2.000 in		2.001–3.000 in		3.001–4.000 in		4.001–5.000 in		5.001–6.000 in
Specification		AMS 4101 and AMS-QQ-A-250/29	AMS 4101 and AMS-QQ-A-250/29		AMS 4101 and AMS-QQ-A-250/29		AMS 4101 and AMS-QQ-A-250/29		AMS 4101 and AMS-QQ-A-250/29		AMS 4101 and AMS-QQ-A-250/29
Basis		S	A	B	A	B	A	B	A	B	A	B
F_tu, ksi	L	66	66	68	65	68	65	67	64	66	63	65
	LT	66	66	68	65	68	65	67	64	66	63	65
	ST	64	64	66	63	64	62	63	61	62	58	59
F_ty, ksi	L	57	57	61	57	61	56	60	55	58	54	56
	LT	57	57	61	57	61	56	60	55	58	54	56
	ST	55	55	59	55	59	54	57	53	55	51	53
F_cy, ksi	L	57	57	61	56	60	55	59	53	56	52	54
	LT	57	57	61	57	61	56	60	55	58	54	56
	ST	…	57	61	58	62	57	61	57	60	56	58
F_bru (e/D = 1.5), ksi	L	…	97	100	96	100	96	99	94	97	93	96
	LT	…	97	100	96	100	96	99	94	97	93	96
	ST	…	97	100	96	100	96	99	94	97	93	96
F_bru (e/D = 2.0), ksi	L	…	126	130	125	130	125	128	123	126	121	125
	LT	…	126	130	125	130	125	128	123	126	121	125
	ST	…	126	130	125	130	125	128	123	126	121	125
F_bry (e/D = 1.5), ksi	L	…	79	84	80	85	80	85	79	84	79	82
	LT	…	79	84	80	85	80	85	79	84	79	82
	ST	…	79	84	80	85	80	85	79	84	79	82
F_bry (e/D = 2.0), ksi	L	…	91	98	92	99	92	99	92	97	91	95
	LT	…	91	98	92	99	92	99	92	97	91	95
	ST	…	91	98	92	99	92	99	92	97	91	95
e, %	L	6	6	6	6	6	5	5	5	5	5	5
	LT	5	5	5	4	4	4	4	4	4	4	4
	ST	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5
E, Msi		10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4	10.4
E_c, Msi		10.9	10.9	10.9	10.9	10.9	10.9	10.9	10.9	10.9	10.9	10.9
G, Msi		4	4	4	4	4	4	4	4	4	4	4
ν		0.33	0.33	0.33	0.33	0.33	0.33	0.33	0.33	0.33	0.33	0.33
ρ, lb/in3		0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1

Effect of Temperature

Percent of the room-temperature value against temperature, digitized from the handbook figures (the shortest exposure of each figure, every 10 °F). Strength curves give the allowable at temperature; "after exposure" curves give the room-temperature property after a soak at that temperature.

Strength allowables at temperature, percent of room temperature

°F	F_tu	F_ty
100	98.8	98.3
200	92.1	92.2
300	82.9	84.3
400		70.8

Factors in percent of the room-temperature allowable.

Source and Use

U.S. Department of Defense (2003). Metallic Materials and Elements for Aerospace Vehicle Structures. MIL-HDBK-5J, 31 January 2003 (public domain). The values are the handbook's design allowables as extracted from the chapter tables; check the printed table before use in a certified analysis, and note that MIL-HDBK-5J was superseded by MMPDS, whose later editions may differ. No warranty is given.