2026-10-06T07:09:58Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34023324 2026-09-30T11:36:27Z category_26740 category_26773 portal_379 item_type_3 month_year_09_2026

Raw tensile dynamic mechanical analysis (DMA) data of a DGEBA epoxy for wind turbine blades: isothermal frequency sweeps and multi-frequency temperature sweeps Mahdi Tayyebati (11621023) Polymers and plastics Solid mechanics Dynamic mechanical analysis (DMA) Epoxy resin Viscoelasticity Frequency sweep Temperature sweep Time-temperature superposition Master curve Glass transition temperature <p dir="ltr">This dataset contains raw dynamic mechanical analysis (DMA) data measured in tension on a cured neat epoxy resin: diglycidyl ether of bisphenol-A (DGEBA) with a mixed cycloaliphatic–aliphatic amine hardener, of the type used to manufacture wind turbine rotor blades. The resin was mixed at a base-to-hardener ratio of 100:31 by weight, cast into 2 mm thick plates, cured for 12 h at 40 °C and post-cured for 10 h at 80 °C. Specimens of 30 × 4 × 2 mm³ were machined from the plates. All tests were run on a DMA/SDTA 1+ analyser (Mettler Toledo, Switzerland) in tension (extension) mode.</p><p dir="ltr">The dataset has two parts:</p><p dir="ltr">(A) 22 isothermal frequency sweeps at setpoint temperatures from 0 to 105 °C in 5 °C steps, measured on one specimen with a 10-minute isothermal stabilisation before each sweep. The sweeps were programmed from 0.1 to 100 Hz with twenty logarithmically spaced points per decade; each recorded sweep contains 60 points from 0.1 to 89.1 Hz. These data can be used to build time–temperature superposition (TTS) master curves.</p><p dir="ltr">(B) Four temperature sweeps at a heating rate of 2 K/min from about −20 °C to 125–150 °C, each at one constant frequency (1, 10, 50 and 100 Hz). These data show the glass transition and its dependence on frequency.</p><p dir="ltr">Each file is a plain-text export from the instrument software with two header lines (column names and units) followed by the measured data: sample and setpoint temperature, time, frequency, force and displacement amplitudes, static force and displacement, phase angle, storage, loss and complex moduli (E′, E″, E*), loss factor (tan δ), compliances and dynamic viscosities. The numerical content is unmodified. The file names give the setpoint temperature of each frequency sweep (e.g. Epoxy_DMA_FreqSweep_T050C.txt) and the frequency of each temperature sweep (e.g. Epoxy_DMA_TempSweep_f010Hz.txt). README.txt describes all files, variables and test conditions.</p> 2026-09-30T11:36:27Z Dataset Dataset 10.11583/DTU.34023324.v1 https://figshare.com/articles/dataset/Raw_tensile_dynamic_mechanical_analysis_DMA_data_of_a_DGEBA_epoxy_for_wind_turbine_blades_isothermal_frequency_sweeps_and_multi-frequency_temperature_sweeps/34023324 CC BY 4.0