Images and data accompanying article: Remarkable response of hollow thermoplastic microspheres-elastomer matrix composites in uniaxial tension.

Images and data accompanying article:
Remarkable response of hollow thermoplastic microspheres-elastomer matrix composites in uniaxial tension.*
By Michel Coret, Erwan Verron & Pierre Rublon
(https://hal.archives-ouvertes.fr/hal-03480982)

Abstract of the article
 In the last few years, the mechanical response of hollow thermoplastic micro-spheres-elastomer matrix composites has been investigated. The large majority of the studies focuses on their compressive properties and particularly on the stress-strain response. In the present paper, large strain uniaxial tension experiments are conducted on thermoplastic microspheres filled polyurethane elastomer. Six volume fractions of microspheres are considered. Thanks to a two-camera setup and digital image correlation measurements, the volumetric response of the materials is extensively analyzed. As a major result, the remarkable volumetric behaviour is highlighted: the hydrostatic pressure vs. volume change curves admit several extrema that may be read as the macroscopic signature of the complex microstructural phenomena involved during deformation. Moreover, it is shown that the size of the volumetric loading-unloading hysteresis loop is directly related to the volume fraction of microspheres in the materials.
Experimental test methodology is described within the article. The objective of the deposit is to share data.

Description of the deposit
Objectives:

The objective of this deposit is to share all the data needed to retrieve the results presented in the article (https://hal.archives-ouvertes.fr/hal-03480982). This deposit do not explain any experimental methodology, that can be found in the article.

Data overview:

1. The images taken during the tests (raw data)
2. Force and displacement measured by the tensile machine (raw data).
3. Surface strain field on face and lateral sides of the tensile specimen (obtain by Digital Image Correlation)
4. Averaged and filtered

Data description:
1. Image directories: "YY/MM/DD_poro_xx_spec_nn"

•   YY/MM/DD: date of the test
•   xx: specimen porosity (can be one of these values [0, 05, 10, 15, 20, 25] in %)
•   nn: Specimen number

   In each directory you will find:

•   YY/MM/DD_poro_xx_spec_nn-aaaaa_0.tif (face side *aaaaa* image)
•   YY/MM/DD_poro_xx_spec_nn-bbbbb_1.tif (lateral side *bbbbb* image
•   YY/MM/DD_poro_xx_spec_nn.csv (Synchronized analogic data with images)
  • Column A: Image n°
  • Columns B & C: Image file name
  • Columns D & E: Timestamp
  • Columns F & G: Analog data (Volts)
  • Column H: Position of the jack (millimeter)
  • Column I: Measured force (N)

2. Scalar data directory: Data_csv/

• DIC: strain average results from digital image correlation on face side (axis xy) and lateral side (axis yz)
  • Column A: Image n°
  • Column B, C, D (Hencky strains): exx, eyy & exy
  • Column E, F (Hencky eigen strains): e1 & e2

• Machine: displacement and force from tensile machine for each image
  • Column A: Image n°
  • Columns B & C: Image file name
  • Columns D & E: Timestamp
  • Columns F & G: Analog data (Volts)
  • Column H: Position of the jack (millimeter)
  • Column I: Measured force (N)

• Post: Average + smoothed data for each porosities
  • Column A: Longitudinal stretch \(\lambda\)
  • Column B: Nominal stress P
  • Column C: Lateral stretch ratio  \(\lambda_w=\lambda_t\)