Documentation

Accepted formats, quantities and rules

Each upload field names the accepted formats and how to export them from the common instrument software; there is no error state, only the list of accepted formats. This page is generated from data/quantities.json, version 2026.09.05-1.

Accepted file formats by measurement

Quantity	Instrument	Accepted formats	Columns	How to export	Uncertainty after
grain size d	XRD (Scherrer, Williamson-Hall)	.xy, .xrdml, .raw converted to .xy	two columns, 2theta and intensity	Bruker DIFFRAC.EVA: File, Export, .xy. PANalytical: save .xrdml directly.	15 %
	EBSD	.ang, .ctf	TSL .ang or Oxford .ctf grid	AZtec: Export, HKL .ctf. OIM: File, Export, .ang.	5 %
residual stress sigma_r	XRD sin^2 psi	.xy per psi tilt, psi list	one .xy per tilt plus a text list of psi angles	Export each tilt scan as .xy; list psi values in a .txt.	10 %
	wafer curvature (Stoney)	curvature before and after in m^-1	two numbers	Profilometer or FSM report: read curvature in m^-1.	10 %
layer thickness h_i	SEM cross-section	image with scale bar	user marks two points	Save .tif with the scale bar burnt in.	5 %
	XRR	.xy	2theta and intensity	Export reflectivity scan as .xy.	1 %
composition composition	EDS, XPS	.csv, .txt exported tables, .vms	element and atomic fraction	EDS: export quant table as .csv. XPS: save survey as VAMAS .vms.	8 %
linear CTE alpha	dilatometry	.csv T vs dL/L	T in K or C, dL/L	Export the run as .csv with temperature and strain columns.	3 %
Young's modulus E	nanoindentation	.csv load-displacement, vendor summary	load, displacement	Export the indent curves or the summary table as .csv.	8 %
interface toughness G_c	four-point bend, DCB, scratch	.csv load-displacement	load, displacement	Export the test-frame record as .csv.	20 %
activation energy Q	permeation or diffusion couple	.csv t and J	time in s, flux in mol m^-2 s^-1	ISO 17081 cell: export transient as .csv.	10 %

Input quantities

Symbol	Name	SI unit	Shown as
E	Young's modulus per material, per form, per T	Pa	GPa
nu	Poisson ratio	1	1
alpha	linear CTE secant value over the T window; rule R02 handles T dependence	K^-1	1e-6 K^-1
sigma_y	yield strength per form and T	Pa	MPa
K_Ic	fracture toughness	Pa m^0.5	MPa m^0.5
G_c	interface toughness with mode mixity psi at which it was measured	J m^-2	J m^-2
psi	mode mixity phase angle at which G_c was measured	rad	deg
h_i	layer thickness	m	um or nm
d	grain size from XRD Scherrer or EBSD; rule R10	m	nm
sigma_r	residual stress from XRD sin^2 psi or Stoney; rule R11	Pa	MPa
D0	Arrhenius prefactor lattice or GB	m^2 s^-1	m^2 s^-1
Q	activation energy lattice or GB	J mol^-1	kJ mol^-1
delta	grain-boundary width default 0.5 nm unless source gives	m	nm
T	temperature from duty cycle	K	K
t	time from duty cycle	s	s
p	pressure from duty cycle	Pa	MPa
n	number of interlayer steps	1	1
K_bulk_modulus	Bulk modulus isothermal unless the row says otherwise	Pa	GPa
alpha_linear	Linear thermal expansion coefficient distinct from alpha: this is the campaign's explicit linear coefficient	1/K	1e-6 / K
alpha_volumetric	Volumetric thermal expansion coefficient three times the linear coefficient only for an isotropic aggregate	1/K	1e-6 / K
bond_strength_tensile	Tensile bond strength coating pull-off; not an interface toughness	Pa	MPa
c11	Elastic stiffness c11 single-crystal stiffness tensor component	Pa	GPa
c12	Elastic stiffness c12 single-crystal stiffness tensor component	Pa	GPa
c44	Elastic stiffness c44 single-crystal shear stiffness component	Pa	GPa
dK_dP	Pressure derivative of the bulk modulus from an equation-of-state fit	dimensionless	dimensionless
density	Density per material, per form	kg/m3	kg/m3
electrical_resistivity	Electrical resistivity per material, per T	ohm*m	microohm*m
flexural_strength	Flexural strength bend test; the row's method states the point count	Pa	MPa
hardness	Hardness indentation hardness; the row's method states the scale	Pa	GPa
hardness_HV30	Vickers hardness, HV30 30 kgf load; kept separate from hardness because the load matters	Pa	GPa
thermal_conductivity	Thermal conductivity per material, per form, per T	W/(m*K)	W/(m*K)
sigma_f	flexural strength as printed by the source, with test_geometry mandatory: three-point and four-point bend on one material differ by a margin that matters, so a strength without its geometry is not a usable number	Pa	MPa
sigma_comp	compression strength Consumed by no rule. NEVER substituted for sigma_f, never a fallback for it, and never satisfies a rule asking for it: compression and flexure are different failure modes with different flaw populations, and for these ceramics the compression value is several times the flexural one, so a rule reaching across would answer confidently in the false-pass direction. Registered 8 September 2026 to carry the Smithells Table 27.1 compression column, which had never been loaded. It is deliberately not registered under the symbol for the allowable stress, which is computed by R06 and never stored. Symbol to be confirmed.	Pa	MPa
weibull_m	Weibull modulus the number that turns a laboratory strength into a design allowable; without it R06 can only report the margin against mean strength	1	1
specimen_volume_m3	effective volume under stress the volume the printed strength was measured on, where the source states it; Weibull scaling needs it and the case volume	m^3	mm^3
G_shear	shear modulus per material, per form, per T Named G_shear rather than G because R16 already derives an energy release rate called G, and two quantities sharing a symbol in one registry is how a unit audit stops being able to check anything. Both are conventionally G in the literature; only one of them can be G here.	Pa	GPa
UTS	ultimate tensile strength per material, per form, per T. NOT a yield stress: R16 and the plasticity cap must never reach for it, because a rule taking UTS where no proof stress exists raises the cap threefold on a solder and answers confidently in the false-pass direction.	Pa	GPa

Rules R00 to R24

R00 preferred value selection derived
The derivation is not published on this page.
derivation not published on this page
R01 biaxial modulus derived
The derivation is not published on this page.
derivation not published on this page
R02 total CTE mismatch derived
The derivation is not published on this page.
derivation not published on this page
R03 temperature excursion derived
The derivation is not published on this page.
derivation not published on this page
R04 unrelieved mismatch stress derived
The derivation is not published on this page.
derivation not published on this page
R05 step stress of a modulus-compensated graded stack derived
The stress carried across each step of a graded stack, from the total expansion mismatch, the temperature change and the number of steps. The expression that sets it is internal work and is not yet published.
derivation not published on this page
R06 step-stress criterion output
Whether the step stress meets the allowable for the case. The allowable is computed rather than stored, because it depends on the material, the geometry, the stressed volume and a chosen failure probability, and a case may state its own. The criterion is ours and is not yet published.
derivation not published on this page
R07 minimum step count output
The smallest number of graded steps for which the step-stress criterion is met. It follows from the step stress and the allowable, and is not yet published.
derivation not published on this page
R08 membrane stress in the compliant metal layer derived
The derivation is not published on this page.
derivation not published on this page
R09 plastic strain derived
The derivation is not published on this page.
derivation not published on this page
R10 grain size from XRD derived
The derivation is not published on this page.
derivation not published on this page
R11 residual stress from XRD derived
The derivation is not published on this page.
derivation not published on this page
R12 effective diffusivity in a polycrystal derived
The derivation is not published on this page.
derivation not published on this page
R13 barrier breakthrough time output
The derivation is not published on this page.
derivation not published on this page
R14 pulses to breakthrough output
How many passes of a duty cycle a barrier survives, by accumulating what each segment consumes of the barrier budget until it is spent. The accumulation model is internal and not yet published.
derivation not published on this page
R15 probability of meeting the barrier criterion output
The probability that a barrier meets its criterion, by propagating input uncertainty through the model. The choice of input distributions is internal and not yet published.
derivation not published on this page
R16 strain energy release rate derived
G = Z sigma^2 h / E_bar, E_bar = E/(1-nu^2), Z = 0.5 edge delamination, Z = 1.976 channelling crack
Hutchinson and Suo 1992
R17 phase angle of loading derived
from Dundurs alpha_D, beta_D; edge delamination psi approximately 52 deg for alpha_D = 0
Hutchinson and Suo 1992
R18 fracture margin output
margin = G_c(psi) / G; G_c(psi) = G_Ic [1 + tan^2((1 - lambda) psi)], lambda default 0.3; delamination if margin < 1
Hutchinson and Suo 1992, mixed mode
R19 weakest interface output
The derivation is not published on this page.
derivation not published on this page
R20 Sobol indices output
The derivation is not published on this page.
derivation not published on this page
R21 measure-next ranking output
A ranking of which quantity is worth measuring next, from sensitivity, current relative uncertainty and instrument cost. The heuristic is ours, it has no ground truth outside a scored case, and it is not yet published.
derivation not published on this page
R22 Dundurs parameter derived
The derivation is not published on this page.
derivation not published on this page
R23 process window output
The derivation is not published on this page.
derivation not published on this page
R24 membrane gate output
A check that the compliant metal layer can carry the membrane load the ceramic-side layers impose on it. Internal, not yet published.
derivation not published on this page
R25 in-plane expansion on an anisotropic plane output
The derivation is not published on this page.
derivation not published on this page
R26 polycrystalline moduli from a crystal tensor output
The derivation is not published on this page.
derivation not published on this page
R27 Poisson ratio derived from a printed pair output
The derivation is not published on this page.
derivation not published on this page
R28 curvature of a free uniaxial laminate beam output
The derivation is not published on this page.
derivation not published on this page

Data provenance

Every property row carries a source, a quality grade (A measured and peer-reviewed, B handbook, C calculated or estimated, D vendor datasheet), a form and a temperature window. The current seed holds 426 property rows for 100 materials and 59 interface rows, all quality C from the placeholder source, to be replaced by literature values one row at a time.