Saxonian Institute of Surface Mechanics

Multi-Axial Indentations to Determine Adhesion, Fracture Toughness, Tensile Strength and much more

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Specifically developed lateral-load nanoindentations or multi-axial indentations enable us to determine a variety of important material parameters:

  • tensile strength (critical tensile stress)
  • fracture toughness or fracture strength for all 3 fracture modes
  • adhesion or adhesive strength
  • intrinsic, thermal or residual stresses
  • anisotropy
  • shear-load strength
tensile fracture (fracture mode 1) to determine tensile strength
For instance, tensile strength of a coating can be determined by doing a specifically designed mixed-load indentation triggering a tensile fracture (mode I fracture) and calculating the tensile stress in the moment of failure.

Therefore, exactly dimensioned scratch tests or specifically designed nanoindentations with additional lateral loads are implemented in order to trigger certain failure mechanisms for which the complete contact field is being calculated afterwards using the „Oliver & Pharr method extended for lateral loads and tilting“. This physical analysis of such complex contact experiments enables us to calculate respective physical material parameters, which are necessary for a model-driven, application-oriented design or optimization of coatings or surfaces.

shear fracture (fracture mode 2) or delamination to determine adhesive strength
An other example shows how a specifically designed multi-axial indentation, which triggers a shear fracture at the interface (fracture mode II), in combination with the calculated shear stress can be used to determine the adhesion.

Please ask us for more information or a quotation!

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