Introducing platform surface interior angle (PSIA) and its role in flake formation, size and shape.

Area of Science:

• Archaeology
• Material Science
• Physics

Background:

• Archaeologists study lithic variability using fracture mechanics, controlled experiments, replication, and attribute studies.
• Fracture mechanics offers insights from physics but has limited application to archaeological studies.
• Controlled experiments isolate variables in flintknapping, yielding models of flake formation applicable to the archaeological record.

Purpose of the Study:

• To link fracture mechanics with controlled experimental results to enhance explanatory and predictive power in lithic studies.
• To document the influence of Hertzian cone formation on flake platforms in flintknapping.
• To strengthen foundational models of flake formation derived from experimental archaeology.

Main Methods:

• Integrating principles of fracture mechanics, specifically Hertzian cone formation, with data from controlled flintknapping experiments.
• Analyzing the relationship between Hertzian cone constants, platform edge geometry, and resulting platform width.
• Applying findings to interpret lithic assemblages and understand past knapping behaviors.

Main Results:

• The platform width in flintknapping is demonstrably a function of the Hertzian cone constant angle and platform edge geometry.
• A direct link between a fundamental concept in fracture mechanics (Hertzian cone formation) and a key attribute of flintknapped artifacts (platform width) was established.
• The study validates and strengthens influential models of flake formation.

Conclusions:

• The integration of fracture mechanics enhances the understanding of lithic variability in archaeological contexts.
• The findings provide a stronger empirical basis for models explaining flintknapping processes.
• Future research can merge experimental results into a more comprehensive model of flake formation, improving interpretations of past human behavior.