Tensile test

Tensile testing of different materials — derive the stress–strain curve from force–extension data and determine Young's modulus, yield point, tensile strength and elongation after fracture.

Select the specimen material and set the initial gauge length and specimen diameter. Then click on Start experiment.

The material model accounts for the influence of specimen geometry on elongation after fracture. Virtual results are not sent to the DataPortal.

material Initial gauge length L₀ / mm Specimen diameter d₀ / mm

Measurement noise i

Spread of the characteristic values i

Real test details

Specimen material

Scanning a specimen sets the material to that of the scanned specimen.

Student group (optional)

Data type

Primary data F, ΔL Secondary data σ, ε

Specimen shape

Round circular cross section (d₀) Flat Rectangular cross section (b₀, a₀)

Standard specimen type

Specimen geometry

Diameter d₀ / mm Initial gauge length L₀ / mm

2CSV file

Drop CSV here or click

No file selected

Separator comma, semicolon or tab · Decimal point or comma · Units in the header optional (e.g. F [N]).

Download CSV template:

Characteristic-value analysis

experiment completed. Select the data source for the analysis:

Step 1 / 4

The testing machine only measures force F and change in length ΔL. To make materials comparable, we calculate stress σ and strain ε by:

① Initial cross section

② Stress ③ Strain

Hooke's-law line

E / MPa

Select measured value at the curve maximum

Measured value no. R_m = —

Parallel for A_g

A_g / %

Position Offset Line — Strain Offset for R_p0.2? 0,00 %

Offset / %

Select measured value at yield strength

Measured value no. R_p0.2 = —

Choose measured value in the Lüders Plateau

Measured value no. R_eL = —

Parallel for elongation after fracture

A / %

Start an experiment to determine the material properties interactively.

Force–extension diagram — force F versus extension ΔL

Material diagram — stress σ versus strain ε

Saved experiments

No experiments saved yet. Run in tab Experiment a tensile test and click on Save experiment.

#	material	Data source i	Model	L₀ / mm i	d₀ / mm i	E / MPa i	R_eH / R_p0.2 / MPa i	R_eL / MPa i	R_m / MPa i	A_g / % i	A / % i	Date	Download	Delete

Save at least one experiment to compare curves.

Characteristic values of the visible experiments

	Experiment	Source	E / GPa	R_eH / R_p0.2 / MPa	R_eL / MPa	R_m / MPa	A_g / %	A / %

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Saved charts

No charts saved yet. In the Comparison tab, create a chart and click Save diagram.

What happens to your measurement data?

01 · Measure

Your measurement data

The original CSV contains force and extension.

02 · Connect

Your knowledge graph

Specimen, material, machine and results are connected.

Ontology Shared terms and relationships

03 · Reuse

A dataset in the DataPortal

After technical approval, the CSV and versuch.ttl are initially uploaded as a private dataset.

Schematic example: the ontology defines the terms. The knowledge graph uses them to describe your particular test.

Import the original CSV from the testing machine to load the measured force and extension into this application. Use the QR codes to add the specimen, material and machine, then review the analysis with your laboratory supervisor. Importing a CSV does not send anything to the DataPortal.

Ontology: An ontology defines shared terms and their relationships: what is a specimen, which properties does a material have and which quantities does a tensile test measure? It provides a common vocabulary for all tests.
Wissensgraph: The knowledge graph uses these terms to describe your particular test. For example, specimen P01 is made of S235, was tested on machine M01 and has a certain ultimate tensile strength. You can view these connections under “Database”.
DataPortal: The MaterialDigital DataPortal is a platform for storing, finding and sharing materials data. The upload contains the unmodified machine CSV and the versuch.ttl file with your test details and results. This file refers to the shared ontology.

The data can then be reused after the laboratory session, for example to compare materials, evaluate material models or support research projects. This requires clear documentation of specimen geometry, units and test conditions. An upload alone does not establish scientific quality or comparability.

First save the real test in the local database. Under “DataPortal upload”, review the proposed files and details. Your laboratory supervisor confirms the technical review and starts the upload using the university password. Virtual test data are not transferred.

The dataset is initially stored privately in the portal, where authorised members of the portal organisation can view it. Before public release, the responsible university must review the data and any personal information it contains; the TTL file may also contain the operator’s name and a student ID number.

About the MaterialDigital DataPortal

Stored experiments (Ontology DB)

	Name	Date	Material	R_m / MPa	E / GPa	Matrikelnr.

Ontology visualization

Export ontology

Each saved test has its own TTL file. The compact view groups related information; the full RDF data remain available in the expert view and exports.

Select a test or the combined overview.

SPARQL query (experts)

Queries run over the entire ontology (all experiments); GRAPH ?g { … } addresses individual experiments.

From the laboratory to the DataPortal

The MaterialDigital DataPortal allows your measurements to be used beyond the laboratory session, for example in material comparisons or research projects. The upload includes the unmodified machine CSV and the file versuch.ttl containing the details and results of the real test.

Select a real test below that you have already saved in the database. Check the files and details in the preview.
Review the analysis together with your laboratory supervisor. The supervisor confirms the technical review using the university or administrator password.
Enter the password again for the upload. Check the university and upload destination in the confirmation dialog. The data are only transferred when you select ‘Upload now’.

After a successful upload, ‘Open dataset in DataPortal’ takes you directly to your dataset. It is initially private: to view it, you need a portal account with access to the relevant organization.

Browse datasets in the MaterialDigital DataPortal

Upload data to the DataPortal

Select a saved real experiment. Review the proposed files and their contents here before transfer.

Saved real experiment

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Save / load workspace

Save workspace

Load workspace

New workspace

Real tensile test with your own data