Establishing direct relationships between soft material perception and rheology

Area of Science:

• Materials Science
• Rheology
• Human Perception

Background:

• Establishing a link between soft material properties and human sensory perception is crucial for consumer product design.
• Subjective sensory measurements lack scientific definitions, hindering objective product development.
• Previous research has struggled to quantify the relationship between material characteristics and user experience.

Purpose of the Study:

• To objectively measure and quantify human-material interactions in soft viscoelastic materials.
• To establish direct relationships between user behavior and measurable rheological properties.
• To explain variability in user-reported sensory perception through scientific metrics.

Main Methods:

• Utilized a series of viscoelastic putties to represent soft materials.
• Employed transient recovery rheology to characterize material properties.
• Quantified human behaviors during material interaction.

Main Results:

• Human behaviors during material interaction were shown to have direct rheological meaning.
• Material rheology was found to scale logarithmically at perception-relevant timescales, similar to Fechner's law.
• A method was developed to directly link user behavior to measurable rheology.

Conclusions:

• Objective quantification of human-material interactions is achievable using rheological methods.
• The study provides a scientific basis for understanding and predicting sensory perception of soft materials.
• This research enables the design of consumer products with desired sensory attributes based on measurable material properties.