VIRTUAL TESTING / CDS WORKBENCH

ASTM D5229 · Moisture uptake calibration

Characterizes moisture uptake and conditioning of composites before comparing properties at a defined moisture state.

Moisture calibration

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Recorded instructional case · Workbench captures and saved calculation data, October 2026. This website preview does not run the test.

Workbench conditioning setup

Uptake & calibration

Calibrated homogeneous-slab uptake

Mass gain (%)

Time (h)

Homogeneous slab uptake
Entered early measurements

View plotted values

Calibrated homogeneous-slab uptake — recorded values
Series	Time (h)	Mass gain (%)
Homogeneous slab uptake	0	0
Homogeneous slab uptake	1	0.05000000000000001
Homogeneous slab uptake	2	0.07071067811865477
Homogeneous slab uptake	3	0.08660254037844388
Homogeneous slab uptake	4	0.10000000000000002
Homogeneous slab uptake	5	0.11180339887498951
Homogeneous slab uptake	6	0.12247448713915891
Homogeneous slab uptake	7	0.13228756555322954
Homogeneous slab uptake	8	0.14142135623730953
Homogeneous slab uptake	9	0.15000000000000002
Homogeneous slab uptake	10	0.158113883008419
Homogeneous slab uptake	11	0.16583123951777
Homogeneous slab uptake	12	0.17320508075688776
Homogeneous slab uptake	13	0.18027756377319948
Homogeneous slab uptake	14	0.18708286933869708
Homogeneous slab uptake	15	0.19364916731037085
Homogeneous slab uptake	16	0.20000000000000004
Homogeneous slab uptake	17	0.20615528128088306
Homogeneous slab uptake	18	0.21213203435596428
Homogeneous slab uptake	19	0.21794494717703372
Homogeneous slab uptake	20	0.22360679774997902
Homogeneous slab uptake	21	0.2291287847475303
Homogeneous slab uptake	22	0.23452078799032894
Homogeneous slab uptake	23	0.23979157616317848
Homogeneous slab uptake	24	0.244948974271744
Homogeneous slab uptake	25	0.24999999998370925
Homogeneous slab uptake	26	0.25495097564191005
Homogeneous slab uptake	27	0.2598076210530603
Homogeneous slab uptake	28	0.26457513093646867
Homogeneous slab uptake	29	0.26925824002206955
Homogeneous slab uptake	30	0.2738612781218541
Homogeneous slab uptake	31	0.27838821699871097
Homogeneous slab uptake	32	0.2828427104768154
Homogeneous slab uptake	33	0.28722812894629424
Homogeneous slab uptake	34	0.2915475891893309
Homogeneous slab uptake	35	0.2958039802787834
Homogeneous slab uptake	36	0.29999998616183754
Homogeneous slab uptake	37	0.3041381054313831
Homogeneous slab uptake	38	0.3082206687001319
Homogeneous slab uptake	39	0.31224985392204585
Homogeneous slab uptake	40	0.31622769994868216
Homogeneous slab uptake	41	0.3201561185617242
Homogeneous slab uptake	42	0.3240369051850711
Homogeneous slab uptake	43	0.32787174844868505
Homogeneous slab uptake	44	0.33166223875062006
Homogeneous slab uptake	45	0.33540987594225247
Homogeneous slab uptake	46	0.33911607624385853
Homogeneous slab uptake	47	0.3427821784826929
Homogeneous slab uptake	48	0.3464094497331135
Homogeneous slab uptake	49	0.3499990904276069
Homogeneous slab uptake	50	0.3535522389985254
Homogeneous slab uptake	51	0.3570699761026106
Homogeneous slab uptake	52	0.3605533284737842
Homogeneous slab uptake	53	0.3640032724440132
Homogeneous slab uptake	54	0.3674207371671856
Homogeneous slab uptake	55	0.37080660757671435
Homogeneous slab uptake	56	0.3741617271039488
Homogeneous slab uptake	57	0.3774869001812987
Homogeneous slab uptake	58	0.38078289455123004
Homogeneous slab uptake	59	0.3840504433998839
Homogeneous slab uptake	60	0.38729024733196804
Homogeneous slab uptake	61	0.3905029762017349
Homogeneous slab uptake	62	0.3936892708132448
Homogeneous slab uptake	63	0.39684974450168564
Homogeneous slab uptake	64	0.39998498460628085
Homogeneous slab uptake	65	0.40309555384420626
Homogeneous slab uptake	66	0.4061819915939635
Homogeneous slab uptake	67	0.40924481509579735
Homogeneous slab uptake	68	0.41228452057597753
Homogeneous slab uptake	69	0.4153015843010903
Homogeneous slab uptake	70	0.4182964635678782
Homogeneous slab uptake	71	0.4212695976336396
Homogeneous slab uptake	72	0.42422140859170787
Homogeneous slab uptake	73	0.42715230219612443
Homogeneous slab uptake	74	0.4300626686392186
Homogeneous slab uptake	75	0.43295288328548853
Homogeneous slab uptake	76	0.43582330736485464
Homogeneous slab uptake	77	0.4386742886281024
Homogeneous slab uptake	78	0.4415061619670728
Homogeneous slab uptake	79	0.44431925000195016
Homogeneous slab uptake	80	0.44711386363779226
Homogeneous slab uptake	81	0.4498903025922788
Homogeneous slab uptake	82	0.45264885589648274
Homogeneous slab uptake	83	0.4553898023703392
Homogeneous slab uptake	84	0.458113411074341
Homogeneous slab uptake	85	0.4608199417388861
Homogeneous slab uptake	86	0.46350964517258286
Homogeneous slab uptake	87	0.4661827636507333
Homogeneous slab uptake	88	0.46883953128511635
Homogeneous slab uptake	89	0.47148017437611967
Homogeneous slab uptake	90	0.4741049117481926
Homogeneous slab uptake	91	0.4767139550695286
Homogeneous slab uptake	92	0.47930750915681797
Homogeneous slab uptake	93	0.4818857722658667
Homogeneous slab uptake	94	0.4844489363688148
Homogeneous slab uptake	95	0.4869971874186487
Homogeneous slab uptake	96	0.4895307056016539
Homogeneous slab uptake	97	0.49204966557841867
Homogeneous slab uptake	98	0.4945542367139578
Homogeneous slab uptake	99	0.49704458329749746
Homogeneous slab uptake	100	0.4995208647524231
Entered early measurements	1	0.05
Entered early measurements	4	0.1

Set up in CDS

Link the slab thickness and equilibrium moisture gain.
Enter two early mass-gain measurements and their times.
Fit diffusivity from the square-root-time slope.
Compare entered measurements with the uptake curve.

Two-point diffusivity calibrationHomogeneous slab uptake predictionMeasured mass gain and equilibrium moisture basis

Inputs for this recorded case

2 mm linked slab
16 plies / 2 mm
Entered uptake calibration
Explicit source calibration/properties

These are teaching-case inputs, not ASTM-prescribed specimen dimensions or acceptance criteria.

Readout & interpretation

Fitted diffusivity: 5.454e-7 mm²/s
Equilibrium mass gain: 1 %
Fit intercept: 0 %
Final predicted mass gain: 0.4995 %

Initially dry homogeneous slab with both faces exposed. Edge ingress is excluded.

About this ASTM reference

Standard Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials

Active catalog edition checked October 10, 2026. The official standard defines the physical method; the CDS example below has a narrower modeling scope. Full procedures remain on ASTM’s site.

Find this setup in Workbench

Opens the connected guided study. Select the matching ASTM setup in the Test menu to inspect its fixture.

What this CDS case represents

Read the actual ASTM standard ↗

Initially dry homogeneous slab with both faces exposed. Edge ingress is excluded.

This conditioning calibration provides its own curves and metrics. Synchronized failure playback is not supported; a mounted fixture view does not imply that contact, crack growth or impact history is solved.

Model basis · equation and interpretation

D = π [t × slope/(4M∞)]²; M(T)/M∞ = 1 − (8/π²) Σ exp[−(2j+1)²π²DT/t²]/(2j+1)².

t is total slab thickness, T elapsed time, M mass gain, M∞ equilibrium mass gain and j a nonnegative integer in the series. Two increasing early measurements define slope = ΔM/Δ√T; both must be at or below 50% of equilibrium. The initially dry homogeneous slab has both faces exposed and constant diffusivity D (mm²/s). No edge ingress, temperature shifting or strength degradation is inferred. Saved material records are not changed.

Instructional model comparison, not experimental validation or ASTM certification. Physical testing requires the licensed standard and a qualified test program.